go pkg 源码
golang pkg 代码
文件路径：/src/cmd/go/internal/load/pkg.go
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package load loads packages.
package load
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"go/build"
"go/scanner"
"go/token"
"io/fs"
"os"
"os/exec"
"path"
pathpkg "path"
"path/filepath"
"runtime"
"runtime/debug"
"sort"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
"cmd/go/internal/base"
"cmd/go/internal/cfg"
"cmd/go/internal/fsys"
"cmd/go/internal/imports"
"cmd/go/internal/modfetch"
"cmd/go/internal/modindex"
"cmd/go/internal/modinfo"
"cmd/go/internal/modload"
"cmd/go/internal/par"
"cmd/go/internal/search"
"cmd/go/internal/str"
"cmd/go/internal/trace"
"cmd/go/internal/vcs"
"cmd/internal/sys"
"golang.org/x/mod/modfile"
"golang.org/x/mod/module"
)
// A Package describes a single package found in a directory.
type Package struct {
PackagePublic // visible in 'go list'
Internal PackageInternal // for use inside go command only
}
type PackagePublic struct {
// Note: These fields are part of the go command's public API.
// See list.go. It is okay to add fields, but not to change or
// remove existing ones. Keep in sync with list.go
Dir string `json:",omitempty"` // directory containing package sources
ImportPath string `json:",omitempty"` // import path of package in dir
ImportComment string `json:",omitempty"` // path in import comment on package statement
Name string `json:",omitempty"` // package name
Doc string `json:",omitempty"` // package documentation string
Target string `json:",omitempty"` // installed target for this package (may be executable)
Shlib string `json:",omitempty"` // the shared library that contains this package (only set when -linkshared)
Root string `json:",omitempty"` // Go root, Go path dir, or module root dir containing this package
ConflictDir string `json:",omitempty"` // Dir is hidden by this other directory
ForTest string `json:",omitempty"` // package is only for use in named test
Export string `json:",omitempty"` // file containing export data (set by go list -export)
BuildID string `json:",omitempty"` // build ID of the compiled package (set by go list -export)
Module *modinfo.ModulePublic `json:",omitempty"` // info about package's module, if any
Match []string `json:",omitempty"` // command-line patterns matching this package
Goroot bool `json:",omitempty"` // is this package found in the Go root?
Standard bool `json:",omitempty"` // is this package part of the standard Go library?
DepOnly bool `json:",omitempty"` // package is only as a dependency, not explicitly listed
BinaryOnly bool `json:",omitempty"` // package cannot be recompiled
Incomplete bool `json:",omitempty"` // was there an error loading this package or dependencies?
// Stale and StaleReason remain here *only* for the list command.
// They are only initialized in preparation for list execution.
// The regular build determines staleness on the fly during action execution.
Stale bool `json:",omitempty"` // would 'go install' do anything for this package?
StaleReason string `json:",omitempty"` // why is Stale true?
// Source files
// If you add to this list you MUST add to p.AllFiles (below) too.
// Otherwise file name security lists will not apply to any new additions.
GoFiles []string `json:",omitempty"` // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
CgoFiles []string `json:",omitempty"` // .go source files that import "C"
CompiledGoFiles []string `json:",omitempty"` // .go output from running cgo on CgoFiles
IgnoredGoFiles []string `json:",omitempty"` // .go source files ignored due to build constraints
InvalidGoFiles []string `json:",omitempty"` // .go source files with detected problems (parse error, wrong package name, and so on)
IgnoredOtherFiles []string `json:",omitempty"` // non-.go source files ignored due to build constraints
CFiles []string `json:",omitempty"` // .c source files
CXXFiles []string `json:",omitempty"` // .cc, .cpp and .cxx source files
MFiles []string `json:",omitempty"` // .m source files
HFiles []string `json:",omitempty"` // .h, .hh, .hpp and .hxx source files
FFiles []string `json:",omitempty"` // .f, .F, .for and .f90 Fortran source files
SFiles []string `json:",omitempty"` // .s source files
SwigFiles []string `json:",omitempty"` // .swig files
SwigCXXFiles []string `json:",omitempty"` // .swigcxx files
SysoFiles []string `json:",omitempty"` // .syso system object files added to package
// Embedded files
EmbedPatterns []string `json:",omitempty"` // //go:embed patterns
EmbedFiles []string `json:",omitempty"` // files matched by EmbedPatterns
// Cgo directives
CgoCFLAGS []string `json:",omitempty"` // cgo: flags for C compiler
CgoCPPFLAGS []string `json:",omitempty"` // cgo: flags for C preprocessor
CgoCXXFLAGS []string `json:",omitempty"` // cgo: flags for C++ compiler
CgoFFLAGS []string `json:",omitempty"` // cgo: flags for Fortran compiler
CgoLDFLAGS []string `json:",omitempty"` // cgo: flags for linker
CgoPkgConfig []string `json:",omitempty"` // cgo: pkg-config names
// Dependency information
Imports []string `json:",omitempty"` // import paths used by this package
ImportMap map[string]string `json:",omitempty"` // map from source import to ImportPath (identity entries omitted)
Deps []string `json:",omitempty"` // all (recursively) imported dependencies
// Error information
// Incomplete is above, packed into the other bools
Error *PackageError `json:",omitempty"` // error loading this package (not dependencies)
DepsErrors []*PackageError `json:",omitempty"` // errors loading dependencies
// Test information
// If you add to this list you MUST add to p.AllFiles (below) too.
// Otherwise file name security lists will not apply to any new additions.
TestGoFiles []string `json:",omitempty"` // _test.go files in package
TestImports []string `json:",omitempty"` // imports from TestGoFiles
TestEmbedPatterns []string `json:",omitempty"` // //go:embed patterns
TestEmbedFiles []string `json:",omitempty"` // files matched by TestEmbedPatterns
XTestGoFiles []string `json:",omitempty"` // _test.go files outside package
XTestImports []string `json:",omitempty"` // imports from XTestGoFiles
XTestEmbedPatterns []string `json:",omitempty"` // //go:embed patterns
XTestEmbedFiles []string `json:",omitempty"` // files matched by XTestEmbedPatterns
}
// AllFiles returns the names of all the files considered for the package.
// This is used for sanity and security checks, so we include all files,
// even IgnoredGoFiles, because some subcommands consider them.
// The go/build package filtered others out (like foo_wrongGOARCH.s)
// and that's OK.
func (p *Package) AllFiles() []string {
files := str.StringList(
p.GoFiles,
p.CgoFiles,
// no p.CompiledGoFiles, because they are from GoFiles or generated by us
p.IgnoredGoFiles,
// no p.InvalidGoFiles, because they are from GoFiles
p.IgnoredOtherFiles,
p.CFiles,
p.CXXFiles,
p.MFiles,
p.HFiles,
p.FFiles,
p.SFiles,
p.SwigFiles,
p.SwigCXXFiles,
p.SysoFiles,
p.TestGoFiles,
p.XTestGoFiles,
)
// EmbedFiles may overlap with the other files.
// Dedup, but delay building the map as long as possible.
// Only files in the current directory (no slash in name)
// need to be checked against the files variable above.
var have map[string]bool
for _, file := range p.EmbedFiles {
if !strings.Contains(file, "/") {
if have == nil {
have = make(map[string]bool)
for _, file := range files {
have[file] = true
}
}
if have[file] {
continue
}
}
files = append(files, file)
}
return files
}
// Desc returns the package "description", for use in b.showOutput.
func (p *Package) Desc() string {
if p.ForTest != "" {
return p.ImportPath + " [" + p.ForTest + ".test]"
}
return p.ImportPath
}
// IsTestOnly reports whether p is a test-only package.
//
// A “test-only” package is one that:
// - is a test-only variant of an ordinary package, or
// - is a synthesized "main" package for a test binary, or
// - contains only _test.go files.
func (p *Package) IsTestOnly() bool {
return p.ForTest != "" ||
p.Internal.TestmainGo != nil ||
len(p.TestGoFiles)+len(p.XTestGoFiles) > 0 && len(p.GoFiles)+len(p.CgoFiles) == 0
}
type PackageInternal struct {
// Unexported fields are not part of the public API.
Build *build.Package
Imports []*Package // this package's direct imports
CompiledImports []string // additional Imports necessary when using CompiledGoFiles (all from standard library); 1:1 with the end of PackagePublic.Imports
RawImports []string // this package's original imports as they appear in the text of the program; 1:1 with the end of PackagePublic.Imports
ForceLibrary bool // this package is a library (even if named "main")
CmdlineFiles bool // package built from files listed on command line
CmdlinePkg bool // package listed on command line
CmdlinePkgLiteral bool // package listed as literal on command line (not via wildcard)
Local bool // imported via local path (./ or ../)
LocalPrefix string // interpret ./ and ../ imports relative to this prefix
ExeName string // desired name for temporary executable
FuzzInstrument bool // package should be instrumented for fuzzing
CoverMode string // preprocess Go source files with the coverage tool in this mode
CoverVars map[string]*CoverVar // variables created by coverage analysis
OmitDebug bool // tell linker not to write debug information
GobinSubdir bool // install target would be subdir of GOBIN
BuildInfo string // add this info to package main
TestmainGo *[]byte // content for _testmain.go
Embed map[string][]string // //go:embed comment mapping
OrigImportPath string // original import path before adding '_test' suffix
Asmflags []string // -asmflags for this package
Gcflags []string // -gcflags for this package
Ldflags []string // -ldflags for this package
Gccgoflags []string // -gccgoflags for this package
}
// A NoGoError indicates that no Go files for the package were applicable to the
// build for that package.
//
// That may be because there were no files whatsoever, or because all files were
// excluded, or because all non-excluded files were test sources.
type NoGoError struct {
Package *Package
}
func (e *NoGoError) Error() string {
if len(e.Package.IgnoredGoFiles) > 0 {
// Go files exist, but they were ignored due to build constraints.
return "build constraints exclude all Go files in " + e.Package.Dir
}
if len(e.Package.TestGoFiles)+len(e.Package.XTestGoFiles) > 0 {
// Test Go files exist, but we're not interested in them.
// The double-negative is unfortunate but we want e.Package.Dir
// to appear at the end of error message.
return "no non-test Go files in " + e.Package.Dir
}
return "no Go files in " + e.Package.Dir
}
// setLoadPackageDataError presents an error found when loading package data
// as a *PackageError. It has special cases for some common errors to improve
// messages shown to users and reduce redundancy.
//
// setLoadPackageDataError returns true if it's safe to load information about
// imported packages, for example, if there was a parse error loading imports
// in one file, but other files are okay.
func (p *Package) setLoadPackageDataError(err error, path string, stk *ImportStack, importPos []token.Position) {
matchErr, isMatchErr := err.(*search.MatchError)
if isMatchErr && matchErr.Match.Pattern() == path {
if matchErr.Match.IsLiteral() {
// The error has a pattern has a pattern similar to the import path.
// It may be slightly different (./foo matching example.com/foo),
// but close enough to seem redundant.
// Unwrap the error so we don't show the pattern.
err = matchErr.Err
}
}
// Replace (possibly wrapped) *build.NoGoError with *load.NoGoError.
// The latter is more specific about the cause.
var nogoErr *build.NoGoError
if errors.As(err, &nogoErr) {
if p.Dir == "" && nogoErr.Dir != "" {
p.Dir = nogoErr.Dir
}
err = &NoGoError{Package: p}
}
// Take only the first error from a scanner.ErrorList. PackageError only
// has room for one position, so we report the first error with a position
// instead of all of the errors without a position.
var pos string
var isScanErr bool
if scanErr, ok := err.(scanner.ErrorList); ok && len(scanErr) > 0 {
isScanErr = true // For stack push/pop below.
scanPos := scanErr[0].Pos
scanPos.Filename = base.ShortPath(scanPos.Filename)
pos = scanPos.String()
err = errors.New(scanErr[0].Msg)
}
// Report the error on the importing package if the problem is with the import declaration
// for example, if the package doesn't exist or if the import path is malformed.
// On the other hand, don't include a position if the problem is with the imported package,
// for example there are no Go files (NoGoError), or there's a problem in the imported
// package's source files themselves (scanner errors).
//
// TODO(matloob): Perhaps make each of those the errors in the first group
// (including modload.ImportMissingError, ImportMissingSumError, and the
// corresponding "cannot find package %q in any of" GOPATH-mode error
// produced in build.(*Context).Import; modload.AmbiguousImportError,
// and modload.PackageNotInModuleError; and the malformed module path errors
// produced in golang.org/x/mod/module.CheckMod) implement an interface
// to make it easier to check for them? That would save us from having to
// move the modload errors into this package to avoid a package import cycle,
// and from having to export an error type for the errors produced in build.
if !isMatchErr && (nogoErr != nil || isScanErr) {
stk.Push(path)
defer stk.Pop()
}
p.Error = &PackageError{
ImportStack: stk.Copy(),
Pos: pos,
Err: err,
}
if path != stk.Top() {
p.Error.setPos(importPos)
}
}
// Resolve returns the resolved version of imports,
// which should be p.TestImports or p.XTestImports, NOT p.Imports.
// The imports in p.TestImports and p.XTestImports are not recursively
// loaded during the initial load of p, so they list the imports found in
// the source file, but most processing should be over the vendor-resolved
// import paths. We do this resolution lazily both to avoid file system work
// and because the eventual real load of the test imports (during 'go test')
// can produce better error messages if it starts with the original paths.
// The initial load of p loads all the non-test imports and rewrites
// the vendored paths, so nothing should ever call p.vendored(p.Imports).
func (p *Package) Resolve(imports []string) []string {
if len(imports) > 0 && len(p.Imports) > 0 && &imports[0] == &p.Imports[0] {
panic("internal error: p.Resolve(p.Imports) called")
}
seen := make(map[string]bool)
var all []string
for _, path := range imports {
path = ResolveImportPath(p, path)
if !seen[path] {
seen[path] = true
all = append(all, path)
}
}
sort.Strings(all)
return all
}
// CoverVar holds the name of the generated coverage variables targeting the named file.
type CoverVar struct {
File string // local file name
Var string // name of count struct
}
func (p *Package) copyBuild(opts PackageOpts, pp *build.Package) {
p.Internal.Build = pp
if pp.PkgTargetRoot != "" && cfg.BuildPkgdir != "" {
old := pp.PkgTargetRoot
pp.PkgRoot = cfg.BuildPkgdir
pp.PkgTargetRoot = cfg.BuildPkgdir
pp.PkgObj = filepath.Join(cfg.BuildPkgdir, strings.TrimPrefix(pp.PkgObj, old))
}
p.Dir = pp.Dir
p.ImportPath = pp.ImportPath
p.ImportComment = pp.ImportComment
p.Name = pp.Name
p.Doc = pp.Doc
p.Root = pp.Root
p.ConflictDir = pp.ConflictDir
p.BinaryOnly = pp.BinaryOnly
// TODO? Target
p.Goroot = pp.Goroot
p.Standard = p.Goroot && p.ImportPath != "" && search.IsStandardImportPath(p.ImportPath)
p.GoFiles = pp.GoFiles
p.CgoFiles = pp.CgoFiles
p.IgnoredGoFiles = pp.IgnoredGoFiles
p.InvalidGoFiles = pp.InvalidGoFiles
p.IgnoredOtherFiles = pp.IgnoredOtherFiles
p.CFiles = pp.CFiles
p.CXXFiles = pp.CXXFiles
p.MFiles = pp.MFiles
p.HFiles = pp.HFiles
p.FFiles = pp.FFiles
p.SFiles = pp.SFiles
p.SwigFiles = pp.SwigFiles
p.SwigCXXFiles = pp.SwigCXXFiles
p.SysoFiles = pp.SysoFiles
if cfg.BuildMSan {
// There's no way for .syso files to be built both with and without
// support for memory sanitizer. Assume they are built without,
// and drop them.
p.SysoFiles = nil
}
p.CgoCFLAGS = pp.CgoCFLAGS
p.CgoCPPFLAGS = pp.CgoCPPFLAGS
p.CgoCXXFLAGS = pp.CgoCXXFLAGS
p.CgoFFLAGS = pp.CgoFFLAGS
p.CgoLDFLAGS = pp.CgoLDFLAGS
p.CgoPkgConfig = pp.CgoPkgConfig
// We modify p.Imports in place, so make copy now.
p.Imports = make([]string, len(pp.Imports))
copy(p.Imports, pp.Imports)
p.Internal.RawImports = pp.Imports
p.TestGoFiles = pp.TestGoFiles
p.TestImports = pp.TestImports
p.XTestGoFiles = pp.XTestGoFiles
p.XTestImports = pp.XTestImports
if opts.IgnoreImports {
p.Imports = nil
p.Internal.RawImports = nil
p.TestImports = nil
p.XTestImports = nil
}
p.EmbedPatterns = pp.EmbedPatterns
p.TestEmbedPatterns = pp.TestEmbedPatterns
p.XTestEmbedPatterns = pp.XTestEmbedPatterns
p.Internal.OrigImportPath = pp.ImportPath
}
// A PackageError describes an error loading information about a package.
type PackageError struct {
ImportStack []string // shortest path from package named on command line to this one
Pos string // position of error
Err error // the error itself
IsImportCycle bool // the error is an import cycle
Hard bool // whether the error is soft or hard; soft errors are ignored in some places
alwaysPrintStack bool // whether to always print the ImportStack
}
func (p *PackageError) Error() string {
// TODO(#43696): decide when to print the stack or the position based on
// the error type and whether the package is in the main module.
// Document the rationale.
if p.Pos != "" && (len(p.ImportStack) == 0 || !p.alwaysPrintStack) {
// Omit import stack. The full path to the file where the error
// is the most important thing.
return p.Pos + ": " + p.Err.Error()
}
// If the error is an ImportPathError, and the last path on the stack appears
// in the error message, omit that path from the stack to avoid repetition.
// If an ImportPathError wraps another ImportPathError that matches the
// last path on the stack, we don't omit the path. An error like
// "package A imports B: error loading C caused by B" would not be clearer
// if "imports B" were omitted.
if len(p.ImportStack) == 0 {
return p.Err.Error()
}
var optpos string
if p.Pos != "" {
optpos = "\n\t" + p.Pos
}
return "package " + strings.Join(p.ImportStack, "\n\timports ") + optpos + ": " + p.Err.Error()
}
func (p *PackageError) Unwrap() error { return p.Err }
// PackageError implements MarshalJSON so that Err is marshaled as a string
// and non-essential fields are omitted.
func (p *PackageError) MarshalJSON() ([]byte, error) {
perr := struct {
ImportStack []string
Pos string
Err string
}{p.ImportStack, p.Pos, p.Err.Error()}
return json.Marshal(perr)
}
func (p *PackageError) setPos(posList []token.Position) {
if len(posList) == 0 {
return
}
pos := posList[0]
pos.Filename = base.ShortPath(pos.Filename)
p.Pos = pos.String()
}
// ImportPathError is a type of error that prevents a package from being loaded
// for a given import path. When such a package is loaded, a *Package is
// returned with Err wrapping an ImportPathError: the error is attached to
// the imported package, not the importing package.
//
// The string returned by ImportPath must appear in the string returned by
// Error. Errors that wrap ImportPathError (such as PackageError) may omit
// the import path.
type ImportPathError interface {
error
ImportPath() string
}
var (
_ ImportPathError = (*importError)(nil)
_ ImportPathError = (*mainPackageError)(nil)
_ ImportPathError = (*modload.ImportMissingError)(nil)
_ ImportPathError = (*modload.ImportMissingSumError)(nil)
_ ImportPathError = (*modload.DirectImportFromImplicitDependencyError)(nil)
)
type importError struct {
importPath string
err error // created with fmt.Errorf
}
func ImportErrorf(path, format string, args ...any) ImportPathError {
err := &importError{importPath: path, err: fmt.Errorf(format, args...)}
if errStr := err.Error(); !strings.Contains(errStr, path) {
panic(fmt.Sprintf("path %q not in error %q", path, errStr))
}
return err
}
func (e *importError) Error() string {
return e.err.Error()
}
func (e *importError) Unwrap() error {
// Don't return e.err directly, since we're only wrapping an error if %w
// was passed to ImportErrorf.
return errors.Unwrap(e.err)
}
func (e *importError) ImportPath() string {
return e.importPath
}
// An ImportStack is a stack of import paths, possibly with the suffix " (test)" appended.
// The import path of a test package is the import path of the corresponding
// non-test package with the suffix "_test" added.
type ImportStack []string
func (s *ImportStack) Push(p string) {
*s = append(*s, p)
}
func (s *ImportStack) Pop() {
*s = (*s)[0 : len(*s)-1]
}
func (s *ImportStack) Copy() []string {
return append([]string{}, *s...)
}
func (s *ImportStack) Top() string {
if len(*s) == 0 {
return ""
}
return (*s)[len(*s)-1]
}
// shorterThan reports whether sp is shorter than t.
// We use this to record the shortest import sequence
// that leads to a particular package.
func (sp *ImportStack) shorterThan(t []string) bool {
s := *sp
if len(s) != len(t) {
return len(s) < len(t)
}
// If they are the same length, settle ties using string ordering.
for i := range s {
if s[i] != t[i] {
return s[i] < t[i]
}
}
return false // they are equal
}
// packageCache is a lookup cache for LoadImport,
// so that if we look up a package multiple times
// we return the same pointer each time.
var packageCache = map[string]*Package{}
// ClearPackageCache clears the in-memory package cache and the preload caches.
// It is only for use by GOPATH-based "go get".
// TODO(jayconrod): When GOPATH-based "go get" is removed, delete this function.
func ClearPackageCache() {
for name := range packageCache {
delete(packageCache, name)
}
resolvedImportCache.Clear()
packageDataCache.Clear()
}
// ClearPackageCachePartial clears packages with the given import paths from the
// in-memory package cache and the preload caches. It is only for use by
// GOPATH-based "go get".
// TODO(jayconrod): When GOPATH-based "go get" is removed, delete this function.
func ClearPackageCachePartial(args []string) {
shouldDelete := make(map[string]bool)
for _, arg := range args {
shouldDelete[arg] = true
if p := packageCache[arg]; p != nil {
delete(packageCache, arg)
}
}
resolvedImportCache.DeleteIf(func(key any) bool {
return shouldDelete[key.(importSpec).path]
})
packageDataCache.DeleteIf(func(key any) bool {
return shouldDelete[key.(string)]
})
}
// ReloadPackageNoFlags is like LoadImport but makes sure
// not to use the package cache.
// It is only for use by GOPATH-based "go get".
// TODO(rsc): When GOPATH-based "go get" is removed, delete this function.
func ReloadPackageNoFlags(arg string, stk *ImportStack) *Package {
p := packageCache[arg]
if p != nil {
delete(packageCache, arg)
resolvedImportCache.DeleteIf(func(key any) bool {
return key.(importSpec).path == p.ImportPath
})
packageDataCache.Delete(p.ImportPath)
}
return LoadImport(context.TODO(), PackageOpts{}, arg, base.Cwd(), nil, stk, nil, 0)
}
// dirToImportPath returns the pseudo-import path we use for a package
// outside the Go path. It begins with _/ and then contains the full path
// to the directory. If the package lives in c:\home\gopher\my\pkg then
// the pseudo-import path is _/c_/home/gopher/my/pkg.
// Using a pseudo-import path like this makes the ./ imports no longer
// a special case, so that all the code to deal with ordinary imports works
// automatically.
func dirToImportPath(dir string) string {
return pathpkg.Join("_", strings.Map(makeImportValid, filepath.ToSlash(dir)))
}
func makeImportValid(r rune) rune {
// Should match Go spec, compilers, and ../../go/parser/parser.go:/isValidImport.
const illegalChars = `!"#$%&'()*,:;<=>?[\]^{|}` + "`\uFFFD"
if !unicode.IsGraphic(r) || unicode.IsSpace(r) || strings.ContainsRune(illegalChars, r) {
return '_'
}
return r
}
// Mode flags for loadImport and download (in get.go).
const (
// ResolveImport means that loadImport should do import path expansion.
// That is, ResolveImport means that the import path came from
// a source file and has not been expanded yet to account for
// vendoring or possible module adjustment.
// Every import path should be loaded initially with ResolveImport,
// and then the expanded version (for example with the /vendor/ in it)
// gets recorded as the canonical import path. At that point, future loads
// of that package must not pass ResolveImport, because
// disallowVendor will reject direct use of paths containing /vendor/.
ResolveImport = 1 << iota
// ResolveModule is for download (part of "go get") and indicates
// that the module adjustment should be done, but not vendor adjustment.
ResolveModule
// GetTestDeps is for download (part of "go get") and indicates
// that test dependencies should be fetched too.
GetTestDeps
)
// LoadImport scans the directory named by path, which must be an import path,
// but possibly a local import path (an absolute file system path or one beginning
// with ./ or ../). A local relative path is interpreted relative to srcDir.
// It returns a *Package describing the package found in that directory.
// LoadImport does not set tool flags and should only be used by
// this package, as part of a bigger load operation, and by GOPATH-based "go get".
// TODO(rsc): When GOPATH-based "go get" is removed, unexport this function.
func LoadImport(ctx context.Context, opts PackageOpts, path, srcDir string, parent *Package, stk *ImportStack, importPos []token.Position, mode int) *Package {
return loadImport(ctx, opts, nil, path, srcDir, parent, stk, importPos, mode)
}
func loadImport(ctx context.Context, opts PackageOpts, pre *preload, path, srcDir string, parent *Package, stk *ImportStack, importPos []token.Position, mode int) *Package {
ctx, span := trace.StartSpan(ctx, "modload.loadImport "+path)
defer span.Done()
if path == "" {
panic("LoadImport called with empty package path")
}
var parentPath, parentRoot string
parentIsStd := false
if parent != nil {
parentPath = parent.ImportPath
parentRoot = parent.Root
parentIsStd = parent.Standard
}
bp, loaded, err := loadPackageData(ctx, path, parentPath, srcDir, parentRoot, parentIsStd, mode)
if loaded && pre != nil && !opts.IgnoreImports {
pre.preloadImports(ctx, opts, bp.Imports, bp)
}
if bp == nil {
p := &Package{
PackagePublic: PackagePublic{
ImportPath: path,
Incomplete: true,
},
}
if importErr, ok := err.(ImportPathError); !ok || importErr.ImportPath() != path {
// Only add path to the error's import stack if it's not already present
// in the error.
//
// TODO(bcmills): setLoadPackageDataError itself has a similar Push / Pop
// sequence that empirically doesn't trigger for these errors, guarded by
// a somewhat complex condition. Figure out how to generalize that
// condition and eliminate the explicit calls here.
stk.Push(path)
defer stk.Pop()
}
p.setLoadPackageDataError(err, path, stk, nil)
return p
}
importPath := bp.ImportPath
p := packageCache[importPath]
if p != nil {
stk.Push(path)
p = reusePackage(p, stk)
stk.Pop()
} else {
p = new(Package)
p.Internal.Local = build.IsLocalImport(path)
p.ImportPath = importPath
packageCache[importPath] = p
// Load package.
// loadPackageData may return bp != nil even if an error occurs,
// in order to return partial information.
p.load(ctx, opts, path, stk, importPos, bp, err)
if !cfg.ModulesEnabled && path != cleanImport(path) {
p.Error = &PackageError{
ImportStack: stk.Copy(),
Err: ImportErrorf(path, "non-canonical import path %q: should be %q", path, pathpkg.Clean(path)),
}
p.Incomplete = true
p.Error.setPos(importPos)
}
}
// Checked on every import because the rules depend on the code doing the importing.
if perr := disallowInternal(ctx, srcDir, parent, parentPath, p, stk); perr != p {
perr.Error.setPos(importPos)
return perr
}
if mode&ResolveImport != 0 {
if perr := disallowVendor(srcDir, path, parentPath, p, stk); perr != p {
perr.Error.setPos(importPos)
return perr
}
}
if p.Name == "main" && parent != nil && parent.Dir != p.Dir {
perr := *p
perr.Error = &PackageError{
ImportStack: stk.Copy(),
Err: ImportErrorf(path, "import %q is a program, not an importable package", path),
}
perr.Error.setPos(importPos)
return &perr
}
if p.Internal.Local && parent != nil && !parent.Internal.Local {
perr := *p
var err error
if path == "." {
err = ImportErrorf(path, "%s: cannot import current directory", path)
} else {
err = ImportErrorf(path, "local import %q in non-local package", path)
}
perr.Error = &PackageError{
ImportStack: stk.Copy(),
Err: err,
}
perr.Error.setPos(importPos)
return &perr
}
return p
}
// loadPackageData loads information needed to construct a *Package. The result
// is cached, and later calls to loadPackageData for the same package will return
// the same data.
//
// loadPackageData returns a non-nil package even if err is non-nil unless
// the package path is malformed (for example, the path contains "mod/" or "@").
//
// loadPackageData returns a boolean, loaded, which is true if this is the
// first time the package was loaded. Callers may preload imports in this case.
func loadPackageData(ctx context.Context, path, parentPath, parentDir, parentRoot string, parentIsStd bool, mode int) (bp *build.Package, loaded bool, err error) {
ctx, span := trace.StartSpan(ctx, "load.loadPackageData "+path)
defer span.Done()
if path == "" {
panic("loadPackageData called with empty package path")
}
if strings.HasPrefix(path, "mod/") {
// Paths beginning with "mod/" might accidentally
// look in the module cache directory tree in $GOPATH/pkg/mod/.
// This prefix is owned by the Go core for possible use in the
// standard library (since it does not begin with a domain name),
// so it's OK to disallow entirely.
return nil, false, fmt.Errorf("disallowed import path %q", path)
}
if strings.Contains(path, "@") {
return nil, false, errors.New("can only use path@version syntax with 'go get' and 'go install' in module-aware mode")
}
// Determine canonical package path and directory.
// For a local import the identifier is the pseudo-import path
// we create from the full directory to the package.
// Otherwise it is the usual import path.
// For vendored imports, it is the expanded form.
//
// Note that when modules are enabled, local import paths are normally
// canonicalized by modload.LoadPackages before now. However, if there's an
// error resolving a local path, it will be returned untransformed
// so that 'go list -e' reports something useful.
importKey := importSpec{
path: path,
parentPath: parentPath,
parentDir: parentDir,
parentRoot: parentRoot,
parentIsStd: parentIsStd,
mode: mode,
}
r := resolvedImportCache.Do(importKey, func() any {
var r resolvedImport
if cfg.ModulesEnabled {
r.dir, r.path, r.err = modload.Lookup(parentPath, parentIsStd, path)
} else if build.IsLocalImport(path) {
r.dir = filepath.Join(parentDir, path)
r.path = dirToImportPath(r.dir)
} else if mode&ResolveImport != 0 {
// We do our own path resolution, because we want to
// find out the key to use in packageCache without the
// overhead of repeated calls to buildContext.Import.
// The code is also needed in a few other places anyway.
r.path = resolveImportPath(path, parentPath, parentDir, parentRoot, parentIsStd)
} else if mode&ResolveModule != 0 {
r.path = moduleImportPath(path, parentPath, parentDir, parentRoot)
}
if r.path == "" {
r.path = path
}
return r
}).(resolvedImport)
// Invariant: r.path is set to the resolved import path. If the path cannot
// be resolved, r.path is set to path, the source import path.
// r.path is never empty.
// Load the package from its directory. If we already found the package's
// directory when resolving its import path, use that.
data := packageDataCache.Do(r.path, func() any {
loaded = true
var data packageData
if r.dir != "" {
var buildMode build.ImportMode
if !cfg.ModulesEnabled {
buildMode = build.ImportComment
}
modroot := modload.PackageModRoot(ctx, r.path)
if modroot == "" && str.HasPathPrefix(r.dir, cfg.GOROOTsrc) {
modroot = cfg.GOROOTsrc
if str.HasPathPrefix(r.dir, cfg.GOROOTsrc+string(filepath.Separator)+"cmd") {
modroot += string(filepath.Separator) + "cmd"
}
}
if modroot != "" {
if rp, err := modindex.GetPackage(modroot, r.dir); err == nil {
data.p, data.err = rp.Import(cfg.BuildContext, buildMode)
goto Happy
} else if !errors.Is(err, modindex.ErrNotIndexed) {
base.Fatalf("go: %v", err)
}
}
data.p, data.err = cfg.BuildContext.ImportDir(r.dir, buildMode)
Happy:
if cfg.ModulesEnabled {
// Override data.p.Root, since ImportDir sets it to $GOPATH, if
// the module is inside $GOPATH/src.
if info := modload.PackageModuleInfo(ctx, path); info != nil {
data.p.Root = info.Dir
}
}
if r.err != nil {
if data.err != nil {
// ImportDir gave us one error, and the module loader gave us another.
// We arbitrarily choose to keep the error from ImportDir because
// that's what our tests already expect, and it seems to provide a bit
// more detail in most cases.
} else if errors.Is(r.err, imports.ErrNoGo) {
// ImportDir said there were files in the package, but the module
// loader said there weren't. Which one is right?
// Without this special-case hack, the TestScript/test_vet case fails
// on the vetfail/p1 package (added in CL 83955).
// Apparently, imports.ShouldBuild biases toward rejecting files
// with invalid build constraints, whereas ImportDir biases toward
// accepting them.
//
// TODO(#41410: Figure out how this actually ought to work and fix
// this mess.
} else {
data.err = r.err
}
}
} else if r.err != nil {
data.p = new(build.Package)
data.err = r.err
} else if cfg.ModulesEnabled && path != "unsafe" {
data.p = new(build.Package)
data.err = fmt.Errorf("unknown import path %q: internal error: module loader did not resolve import", r.path)
} else {
buildMode := build.ImportComment
if mode&ResolveImport == 0 || r.path != path {
// Not vendoring, or we already found the vendored path.
buildMode |= build.IgnoreVendor
}
data.p, data.err = cfg.BuildContext.Import(r.path, parentDir, buildMode)
}
data.p.ImportPath = r.path
// Set data.p.BinDir in cases where go/build.Context.Import
// may give us a path we don't want.
if !data.p.Goroot {
if cfg.GOBIN != "" {
data.p.BinDir = cfg.GOBIN
} else if cfg.ModulesEnabled {
data.p.BinDir = modload.BinDir()
}
}
if !cfg.ModulesEnabled && data.err == nil &&
data.p.ImportComment != "" && data.p.ImportComment != path &&
!strings.Contains(path, "/vendor/") && !strings.HasPrefix(path, "vendor/") {
data.err = fmt.Errorf("code in directory %s expects import %q", data.p.Dir, data.p.ImportComment)
}
return data
}).(packageData)
return data.p, loaded, data.err
}
// importSpec describes an import declaration in source code. It is used as a
// cache key for resolvedImportCache.
type importSpec struct {
path string
parentPath, parentDir, parentRoot string
parentIsStd bool
mode int
}
// resolvedImport holds a canonical identifier for a package. It may also contain
// a path to the package's directory and an error if one occurred. resolvedImport
// is the value type in resolvedImportCache.
type resolvedImport struct {
path, dir string
err error
}
// packageData holds information loaded from a package. It is the value type
// in packageDataCache.
type packageData struct {
p *build.Package
err error
}
// resolvedImportCache maps import strings (importSpec) to canonical package names
// (resolvedImport).
var resolvedImportCache par.Cache
// packageDataCache maps canonical package names (string) to package metadata
// (packageData).
var packageDataCache par.Cache
// preloadWorkerCount is the number of concurrent goroutines that can load
// packages. Experimentally, there are diminishing returns with more than
// 4 workers. This was measured on the following machines.
//
// * MacBookPro with a 4-core Intel Core i7 CPU
// * Linux workstation with 6-core Intel Xeon CPU
// * Linux workstation with 24-core Intel Xeon CPU
//
// It is very likely (though not confirmed) that this workload is limited
// by memory bandwidth. We don't have a good way to determine the number of
// workers that would saturate the bus though, so runtime.GOMAXPROCS
// seems like a reasonable default.
var preloadWorkerCount = runtime.GOMAXPROCS(0)
// preload holds state for managing concurrent preloading of package data.
//
// A preload should be created with newPreload before loading a large
// package graph. flush must be called when package loading is complete
// to ensure preload goroutines are no longer active. This is necessary
// because of global mutable state that cannot safely be read and written
// concurrently. In particular, packageDataCache may be cleared by "go get"
// in GOPATH mode, and modload.loaded (accessed via modload.Lookup) may be
// modified by modload.LoadPackages.
type preload struct {
cancel chan struct{}
sema chan struct{}
}
// newPreload creates a new preloader. flush must be called later to avoid
// accessing global state while it is being modified.
func newPreload() *preload {
pre := &preload{
cancel: make(chan struct{}),
sema: make(chan struct{}, preloadWorkerCount),
}
return pre
}
// preloadMatches loads data for package paths matched by patterns.
// When preloadMatches returns, some packages may not be loaded yet, but
// loadPackageData and loadImport are always safe to call.
func (pre *preload) preloadMatches(ctx context.Context, opts PackageOpts, matches []*search.Match) {
for _, m := range matches {
for _, pkg := range m.Pkgs {
select {
case <-pre.cancel:
return
case pre.sema <- struct{}{}:
go func(pkg string) {
mode := 0 // don't use vendoring or module import resolution
bp, loaded, err := loadPackageData(ctx, pkg, "", base.Cwd(), "", false, mode)
<-pre.sema
if bp != nil && loaded && err == nil && !opts.IgnoreImports {
pre.preloadImports(ctx, opts, bp.Imports, bp)
}
}(pkg)
}
}
}
}
// preloadImports queues a list of imports for preloading.
// When preloadImports returns, some packages may not be loaded yet,
// but loadPackageData and loadImport are always safe to call.
func (pre *preload) preloadImports(ctx context.Context, opts PackageOpts, imports []string, parent *build.Package) {
parentIsStd := parent.Goroot && parent.ImportPath != "" && search.IsStandardImportPath(parent.ImportPath)
for _, path := range imports {
if path == "C" || path == "unsafe" {
continue
}
select {
case <-pre.cancel:
return
case pre.sema <- struct{}{}:
go func(path string) {
bp, loaded, err := loadPackageData(ctx, path, parent.ImportPath, parent.Dir, parent.Root, parentIsStd, ResolveImport)
<-pre.sema
if bp != nil && loaded && err == nil && !opts.IgnoreImports {
pre.preloadImports(ctx, opts, bp.Imports, bp)
}
}(path)
}
}
}
// flush stops pending preload operations. flush blocks until preload calls to
// loadPackageData have completed. The preloader will not make any new calls
// to loadPackageData.
func (pre *preload) flush() {
// flush is usually deferred.
// Don't hang program waiting for workers on panic.
if v := recover(); v != nil {
panic(v)
}
close(pre.cancel)
for i := 0; i < preloadWorkerCount; i++ {
pre.sema <- struct{}{}
}
}
func cleanImport(path string) string {
orig := path
path = pathpkg.Clean(path)
if strings.HasPrefix(orig, "./") && path != ".." && !strings.HasPrefix(path, "../") {
path = "./" + path
}
return path
}
var isDirCache par.Cache
func isDir(path string) bool {
return isDirCache.Do(path, func() any {
fi, err := fsys.Stat(path)
return err == nil && fi.IsDir()
}).(bool)
}
// ResolveImportPath returns the true meaning of path when it appears in parent.
// There are two different resolutions applied.
// First, there is Go 1.5 vendoring (golang.org/s/go15vendor).
// If vendor expansion doesn't trigger, then the path is also subject to
// Go 1.11 module legacy conversion (golang.org/issue/25069).
func ResolveImportPath(parent *Package, path string) (found string) {
var parentPath, parentDir, parentRoot string
parentIsStd := false
if parent != nil {
parentPath = parent.ImportPath
parentDir = parent.Dir
parentRoot = parent.Root
parentIsStd = parent.Standard
}
return resolveImportPath(path, parentPath, parentDir, parentRoot, parentIsStd)
}
func resolveImportPath(path, parentPath, parentDir, parentRoot string, parentIsStd bool) (found string) {
if cfg.ModulesEnabled {
if _, p, e := modload.Lookup(parentPath, parentIsStd, path); e == nil {
return p
}
return path
}
found = vendoredImportPath(path, parentPath, parentDir, parentRoot)
if found != path {
return found
}
return moduleImportPath(path, parentPath, parentDir, parentRoot)
}
// dirAndRoot returns the source directory and workspace root
// for the package p, guaranteeing that root is a path prefix of dir.
func dirAndRoot(path string, dir, root string) (string, string) {
origDir, origRoot := dir, root
dir = filepath.Clean(dir)
root = filepath.Join(root, "src")
if !str.HasFilePathPrefix(dir, root) || path != "command-line-arguments" && filepath.Join(root, path) != dir {
// Look for symlinks before reporting error.
dir = expandPath(dir)
root = expandPath(root)
}
if !str.HasFilePathPrefix(dir, root) || len(dir) <= len(root) || dir[len(root)] != filepath.Separator || path != "command-line-arguments" && !build.IsLocalImport(path) && filepath.Join(root, path) != dir {
debug.PrintStack()
base.Fatalf("unexpected directory layout:\n"+
" import path: %s\n"+
" root: %s\n"+
" dir: %s\n"+
" expand root: %s\n"+
" expand dir: %s\n"+
" separator: %s",
path,
filepath.Join(origRoot, "src"),
filepath.Clean(origDir),
origRoot,
origDir,
string(filepath.Separator))
}
return dir, root
}
// vendoredImportPath returns the vendor-expansion of path when it appears in parent.
// If parent is x/y/z, then path might expand to x/y/z/vendor/path, x/y/vendor/path,
// x/vendor/path, vendor/path, or else stay path if none of those exist.
// vendoredImportPath returns the expanded path or, if no expansion is found, the original.
func vendoredImportPath(path, parentPath, parentDir, parentRoot string) (found string) {
if parentRoot == "" {
return path
}
dir, root := dirAndRoot(parentPath, parentDir, parentRoot)
vpath := "vendor/" + path
for i := len(dir); i >= len(root); i-- {
if i < len(dir) && dir[i] != filepath.Separator {
continue
}
// Note: checking for the vendor directory before checking
// for the vendor/path directory helps us hit the
// isDir cache more often. It also helps us prepare a more useful
// list of places we looked, to report when an import is not found.
if !isDir(filepath.Join(dir[:i], "vendor")) {
continue
}
targ := filepath.Join(dir[:i], vpath)
if isDir(targ) && hasGoFiles(targ) {
importPath := parentPath
if importPath == "command-line-arguments" {
// If parent.ImportPath is 'command-line-arguments'.
// set to relative directory to root (also chopped root directory)
importPath = dir[len(root)+1:]
}
// We started with parent's dir c:\gopath\src\foo\bar\baz\quux\xyzzy.
// We know the import path for parent's dir.
// We chopped off some number of path elements and
// added vendor\path to produce c:\gopath\src\foo\bar\baz\vendor\path.
// Now we want to know the import path for that directory.
// Construct it by chopping the same number of path elements
// (actually the same number of bytes) from parent's import path
// and then append /vendor/path.
chopped := len(dir) - i
if chopped == len(importPath)+1 {
// We walked up from c:\gopath\src\foo\bar
// and found c:\gopath\src\vendor\path.
// We chopped \foo\bar (length 8) but the import path is "foo/bar" (length 7).
// Use "vendor/path" without any prefix.
return vpath
}
return importPath[:len(importPath)-chopped] + "/" + vpath
}
}
return path
}
var (
modulePrefix = []byte("\nmodule ")
goModPathCache par.Cache
)
// goModPath returns the module path in the go.mod in dir, if any.
func goModPath(dir string) (path string) {
return goModPathCache.Do(dir, func() any {
data, err := os.ReadFile(filepath.Join(dir, "go.mod"))
if err != nil {
return ""
}
var i int
if bytes.HasPrefix(data, modulePrefix[1:]) {
i = 0
} else {
i = bytes.Index(data, modulePrefix)
if i < 0 {
return ""
}
i++
}
line := data[i:]
// Cut line at \n, drop trailing \r if present.
if j := bytes.IndexByte(line, '\n'); j >= 0 {
line = line[:j]
}
if line[len(line)-1] == '\r' {
line = line[:len(line)-1]
}
line = line[len("module "):]
// If quoted, unquote.
path = strings.TrimSpace(string(line))
if path != "" && path[0] == '"' {
s, err := strconv.Unquote(path)
if err != nil {
return ""
}
path = s
}
return path
}).(string)
}
// findVersionElement returns the slice indices of the final version element /vN in path.
// If there is no such element, it returns -1, -1.
func findVersionElement(path string) (i, j int) {
j = len(path)
for i = len(path) - 1; i >= 0; i-- {
if path[i] == '/' {
if isVersionElement(path[i+1 : j]) {
return i, j
}
j = i
}
}
return -1, -1
}
// isVersionElement reports whether s is a well-formed path version element:
// v2, v3, v10, etc, but not v0, v05, v1.
func isVersionElement(s string) bool {
if len(s) < 2 || s[0] != 'v' || s[1] == '0' || s[1] == '1' && len(s) == 2 {
return false
}
for i := 1; i < len(s); i++ {
if s[i] < '0' || '9' < s[i] {
return false
}
}
return true
}
// moduleImportPath translates import paths found in go modules
// back down to paths that can be resolved in ordinary builds.
//
// Define “new” code as code with a go.mod file in the same directory
// or a parent directory. If an import in new code says x/y/v2/z but
// x/y/v2/z does not exist and x/y/go.mod says “module x/y/v2”,
// then go build will read the import as x/y/z instead.
// See golang.org/issue/25069.
func moduleImportPath(path, parentPath, parentDir, parentRoot string) (found string) {
if parentRoot == "" {
return path
}
// If there are no vN elements in path, leave it alone.
// (The code below would do the same, but only after
// some other file system accesses that we can avoid
// here by returning early.)
if i, _ := findVersionElement(path); i < 0 {
return path
}
dir, root := dirAndRoot(parentPath, parentDir, parentRoot)
// Consider dir and parents, up to and including root.
for i := len(dir); i >= len(root); i-- {
if i < len(dir) && dir[i] != filepath.Separator {
continue
}
if goModPath(dir[:i]) != "" {
goto HaveGoMod
}
}
// This code is not in a tree with a go.mod,
// so apply no changes to the path.
return path
HaveGoMod:
// This import is in a tree with a go.mod.
// Allow it to refer to code in GOPATH/src/x/y/z as x/y/v2/z
// if GOPATH/src/x/y/go.mod says module "x/y/v2",
// If x/y/v2/z exists, use it unmodified.
if bp, _ := cfg.BuildContext.Import(path, "", build.IgnoreVendor); bp.Dir != "" {
return path
}
// Otherwise look for a go.mod supplying a version element.
// Some version-like elements may appear in paths but not
// be module versions; we skip over those to look for module
// versions. For example the module m/v2 might have a
// package m/v2/api/v1/foo.
limit := len(path)
for limit > 0 {
i, j := findVersionElement(path[:limit])
if i < 0 {
return path
}
if bp, _ := cfg.BuildContext.Import(path[:i], "", build.IgnoreVendor); bp.Dir != "" {
if mpath := goModPath(bp.Dir); mpath != "" {
// Found a valid go.mod file, so we're stopping the search.
// If the path is m/v2/p and we found m/go.mod that says
// "module m/v2", then we return "m/p".
if mpath == path[:j] {
return path[:i] + path[j:]
}
// Otherwise just return the original path.
// We didn't find anything worth rewriting,
// and the go.mod indicates that we should
// not consider parent directories.
return path
}
}
limit = i
}
return path
}
// hasGoFiles reports whether dir contains any files with names ending in .go.
// For a vendor check we must exclude directories that contain no .go files.
// Otherwise it is not possible to vendor just a/b/c and still import the
// non-vendored a/b. See golang.org/issue/13832.
func hasGoFiles(dir string) bool {
files, _ := os.ReadDir(dir)
for _, f := range files {
if !f.IsDir() && strings.HasSuffix(f.Name(), ".go") {
return true
}
}
return false
}
// reusePackage reuses package p to satisfy the import at the top
// of the import stack stk. If this use causes an import loop,
// reusePackage updates p's error information to record the loop.
func reusePackage(p *Package, stk *ImportStack) *Package {
// We use p.Internal.Imports==nil to detect a package that
// is in the midst of its own loadPackage call
// (all the recursion below happens before p.Internal.Imports gets set).
if p.Internal.Imports == nil {
if p.Error == nil {
p.Error = &PackageError{
ImportStack: stk.Copy(),
Err: errors.New("import cycle not allowed"),
IsImportCycle: true,
}
} else if !p.Error.IsImportCycle {
// If the error is already set, but it does not indicate that
// we are in an import cycle, set IsImportCycle so that we don't
// end up stuck in a loop down the road.
p.Error.IsImportCycle = true
}
p.Incomplete = true
}
// Don't rewrite the import stack in the error if we have an import cycle.
// If we do, we'll lose the path that describes the cycle.
if p.Error != nil && !p.Error.IsImportCycle && stk.shorterThan(p.Error.ImportStack) {
p.Error.ImportStack = stk.Copy()
}
return p
}
// disallowInternal checks that srcDir (containing package importerPath, if non-empty)
// is allowed to import p.
// If the import is allowed, disallowInternal returns the original package p.
// If not, it returns a new package containing just an appropriate error.
func disallowInternal(ctx context.Context, srcDir string, importer *Package, importerPath string, p *Package, stk *ImportStack) *Package {
// golang.org/s/go14internal:
// An import of a path containing the element “internal”
// is disallowed if the importing code is outside the tree
// rooted at the parent of the “internal” directory.
// There was an error loading the package; stop here.
if p.Error != nil {
return p
}
// The generated 'testmain' package is allowed to access testing/internal/...,
// as if it were generated into the testing directory tree
// (it's actually in a temporary directory outside any Go tree).
// This cleans up a former kludge in passing functionality to the testing package.
if str.HasPathPrefix(p.ImportPath, "testing/internal") && importerPath == "testmain" {
return p
}
// We can't check standard packages with gccgo.
if cfg.BuildContext.Compiler == "gccgo" && p.Standard {
return p
}
// The sort package depends on internal/reflectlite, but during bootstrap
// the path rewriting causes the normal internal checks to fail.
// Instead, just ignore the internal rules during bootstrap.
if p.Standard && strings.HasPrefix(importerPath, "bootstrap/") {
return p
}
// importerPath is empty: we started
// with a name given on the command line, not an
// import. Anything listed on the command line is fine.
if importerPath == "" {
return p
}
// Check for "internal" element: three cases depending on begin of string and/or end of string.
i, ok := findInternal(p.ImportPath)
if !ok {
return p
}
// Internal is present.
// Map import path back to directory corresponding to parent of internal.
if i > 0 {
i-- // rewind over slash in ".../internal"
}
if p.Module == nil {
parent := p.Dir[:i+len(p.Dir)-len(p.ImportPath)]
if str.HasFilePathPrefix(filepath.Clean(srcDir), filepath.Clean(parent)) {
return p
}
// Look for symlinks before reporting error.
srcDir = expandPath(srcDir)
parent = expandPath(parent)
if str.HasFilePathPrefix(filepath.Clean(srcDir), filepath.Clean(parent)) {
return p
}
} else {
// p is in a module, so make it available based on the importer's import path instead
// of the file path (https://golang.org/issue/23970).
if importer.Internal.CmdlineFiles {
// The importer is a list of command-line files.
// Pretend that the import path is the import path of the
// directory containing them.
// If the directory is outside the main modules, this will resolve to ".",
// which is not a prefix of any valid module.
importerPath, _ = modload.MainModules.DirImportPath(ctx, importer.Dir)
}
parentOfInternal := p.ImportPath[:i]
if str.HasPathPrefix(importerPath, parentOfInternal) {
return p
}
}
// Internal is present, and srcDir is outside parent's tree. Not allowed.
perr := *p
perr.Error = &PackageError{
alwaysPrintStack: true,
ImportStack: stk.Copy(),
Err: ImportErrorf(p.ImportPath, "use of internal package "+p.ImportPath+" not allowed"),
}
perr.Incomplete = true
return &perr
}
// findInternal looks for the final "internal" path element in the given import path.
// If there isn't one, findInternal returns ok=false.
// Otherwise, findInternal returns ok=true and the index of the "internal".
func findInternal(path string) (index int, ok bool) {
// Three cases, depending on internal at start/end of string or not.
// The order matters: we must return the index of the final element,
// because the final one produces the most restrictive requirement
// on the importer.
switch {
case strings.HasSuffix(path, "/internal"):
return len(path) - len("internal"), true
case strings.Contains(path, "/internal/"):
return strings.LastIndex(path, "/internal/") + 1, true
case path == "internal", strings.HasPrefix(path, "internal/"):
return 0, true
}
return 0, false
}
// disallowVendor checks that srcDir is allowed to import p as path.
// If the import is allowed, disallowVendor returns the original package p.
// If not, it returns a new package containing just an appropriate error.
func disallowVendor(srcDir string, path string, importerPath string, p *Package, stk *ImportStack) *Package {
// If the importerPath is empty, we started
// with a name given on the command line, not an
// import. Anything listed on the command line is fine.
if importerPath == "" {
return p
}
if perr := disallowVendorVisibility(srcDir, p, importerPath, stk); perr != p {
return perr
}
// Paths like x/vendor/y must be imported as y, never as x/vendor/y.
if i, ok := FindVendor(path); ok {
perr := *p
perr.Error = &PackageError{
ImportStack: stk.Copy(),
Err: ImportErrorf(path, "%s must be imported as %s", path, path[i+len("vendor/"):]),
}
perr.Incomplete = true
return &perr
}
return p
}
// disallowVendorVisibility checks that srcDir is allowed to import p.
// The rules are the same as for /internal/ except that a path ending in /vendor
// is not subject to the rules, only subdirectories of vendor.
// This allows people to have packages and commands named vendor,
// for maximal compatibility with existing source trees.
func disallowVendorVisibility(srcDir string, p *Package, importerPath string, stk *ImportStack) *Package {
// The stack does not include p.ImportPath.
// If there's nothing on the stack, we started
// with a name given on the command line, not an
// import. Anything listed on the command line is fine.
if importerPath == "" {
return p
}
// Check for "vendor" element.
i, ok := FindVendor(p.ImportPath)
if !ok {
return p
}
// Vendor is present.
// Map import path back to directory corresponding to parent of vendor.
if i > 0 {
i-- // rewind over slash in ".../vendor"
}
truncateTo := i + len(p.Dir) - len(p.ImportPath)
if truncateTo < 0 || len(p.Dir) < truncateTo {
return p
}
parent := p.Dir[:truncateTo]
if str.HasFilePathPrefix(filepath.Clean(srcDir), filepath.Clean(parent)) {
return p
}
// Look for symlinks before reporting error.
srcDir = expandPath(srcDir)
parent = expandPath(parent)
if str.HasFilePathPrefix(filepath.Clean(srcDir), filepath.Clean(parent)) {
return p
}
// Vendor is present, and srcDir is outside parent's tree. Not allowed.
perr := *p
perr.Error = &PackageError{
ImportStack: stk.Copy(),
Err: errors.New("use of vendored package not allowed"),
}
perr.Incomplete = true
return &perr
}
// FindVendor looks for the last non-terminating "vendor" path element in the given import path.
// If there isn't one, FindVendor returns ok=false.
// Otherwise, FindVendor returns ok=true and the index of the "vendor".
//
// Note that terminating "vendor" elements don't count: "x/vendor" is its own package,
// not the vendored copy of an import "" (the empty import path).
// This will allow people to have packages or commands named vendor.
// This may help reduce breakage, or it may just be confusing. We'll see.
func FindVendor(path string) (index int, ok bool) {
// Two cases, depending on internal at start of string or not.
// The order matters: we must return the index of the final element,
// because the final one is where the effective import path starts.
switch {
case strings.Contains(path, "/vendor/"):
return strings.LastIndex(path, "/vendor/") + 1, true
case strings.HasPrefix(path, "vendor/"):
return 0, true
}
return 0, false
}
type TargetDir int
const (
ToTool TargetDir = iota // to GOROOT/pkg/tool (default for cmd/*)
ToBin // to bin dir inside package root (default for non-cmd/*)
StalePath // an old import path; fail to build
)
// InstallTargetDir reports the target directory for installing the command p.
func InstallTargetDir(p *Package) TargetDir {
if strings.HasPrefix(p.ImportPath, "code.google.com/p/go.tools/cmd/") {
return StalePath
}
if p.Goroot && strings.HasPrefix(p.ImportPath, "cmd/") && p.Name == "main" {
switch p.ImportPath {
case "cmd/go", "cmd/gofmt":
return ToBin
}
return ToTool
}
return ToBin
}
var cgoExclude = map[string]bool{
"runtime/cgo": true,
}
var cgoSyscallExclude = map[string]bool{
"runtime/cgo": true,
"runtime/race": true,
"runtime/msan": true,
"runtime/asan": true,
}
var foldPath = make(map[string]string)
// exeFromImportPath returns an executable name
// for a package using the import path.
//
// The executable name is the last element of the import path.
// In module-aware mode, an additional rule is used on import paths
// consisting of two or more path elements. If the last element is
// a vN path element specifying the major version, then the
// second last element of the import path is used instead.
func (p *Package) exeFromImportPath() string {
_, elem := pathpkg.Split(p.ImportPath)
if cfg.ModulesEnabled {
// If this is example.com/mycmd/v2, it's more useful to
// install it as mycmd than as v2. See golang.org/issue/24667.
if elem != p.ImportPath && isVersionElement(elem) {
_, elem = pathpkg.Split(pathpkg.Dir(p.ImportPath))
}
}
return elem
}
// exeFromFiles returns an executable name for a package
// using the first element in GoFiles or CgoFiles collections without the prefix.
//
// Returns empty string in case of empty collection.
func (p *Package) exeFromFiles() string {
var src string
if len(p.GoFiles) > 0 {
src = p.GoFiles[0]
} else if len(p.CgoFiles) > 0 {
src = p.CgoFiles[0]
} else {
return ""
}
_, elem := filepath.Split(src)
return elem[:len(elem)-len(".go")]
}
// DefaultExecName returns the default executable name for a package
func (p *Package) DefaultExecName() string {
if p.Internal.CmdlineFiles {
return p.exeFromFiles()
}
return p.exeFromImportPath()
}
// load populates p using information from bp, err, which should
// be the result of calling build.Context.Import.
// stk contains the import stack, not including path itself.
func (p *Package) load(ctx context.Context, opts PackageOpts, path string, stk *ImportStack, importPos []token.Position, bp *build.Package, err error) {
p.copyBuild(opts, bp)
// The localPrefix is the path we interpret ./ imports relative to,
// if we support them at all (not in module mode!).
// Synthesized main packages sometimes override this.
if p.Internal.Local && !cfg.ModulesEnabled {
p.Internal.LocalPrefix = dirToImportPath(p.Dir)
}
// setError sets p.Error if it hasn't already been set. We may proceed
// after encountering some errors so that 'go list -e' has more complete
// output. If there's more than one error, we should report the first.
setError := func(err error) {
if p.Error == nil {
p.Error = &PackageError{
ImportStack: stk.Copy(),
Err: err,
}
// Add the importer's position information if the import position exists, and
// the current package being examined is the importer.
// If we have not yet accepted package p onto the import stack,
// then the cause of the error is not within p itself: the error
// must be either in an explicit command-line argument,
// or on the importer side (indicated by a non-empty importPos).
if path != stk.Top() && len(importPos) > 0 {
p.Error.setPos(importPos)
}
}
}
if err != nil {
p.Incomplete = true
p.setLoadPackageDataError(err, path, stk, importPos)
}
useBindir := p.Name == "main"
if !p.Standard {
switch cfg.BuildBuildmode {
case "c-archive", "c-shared", "plugin":
useBindir = false
}
}
if useBindir {
// Report an error when the old code.google.com/p/go.tools paths are used.
if InstallTargetDir(p) == StalePath {
// TODO(matloob): remove this branch, and StalePath itself. code.google.com/p/go is so
// old, even this code checking for it is stale now!
newPath := strings.Replace(p.ImportPath, "code.google.com/p/go.", "golang.org/x/", 1)
e := ImportErrorf(p.ImportPath, "the %v command has moved; use %v instead.", p.ImportPath, newPath)
setError(e)
return
}
elem := p.DefaultExecName()
full := cfg.BuildContext.GOOS + "_" + cfg.BuildContext.GOARCH + "/" + elem
if cfg.BuildContext.GOOS != base.ToolGOOS || cfg.BuildContext.GOARCH != base.ToolGOARCH {
// Install cross-compiled binaries to subdirectories of bin.
elem = full
}
if p.Internal.Build.BinDir == "" && cfg.ModulesEnabled {
p.Internal.Build.BinDir = modload.BinDir()
}
if p.Internal.Build.BinDir != "" {
// Install to GOBIN or bin of GOPATH entry.
p.Target = filepath.Join(p.Internal.Build.BinDir, elem)
if !p.Goroot && strings.Contains(elem, "/") && cfg.GOBIN != "" {
// Do not create $GOBIN/goos_goarch/elem.
p.Target = ""
p.Internal.GobinSubdir = true
}
}
if InstallTargetDir(p) == ToTool {
// This is for 'go tool'.
// Override all the usual logic and force it into the tool directory.
if cfg.BuildToolchainName == "gccgo" {
p.Target = filepath.Join(base.ToolDir, elem)
} else {
p.Target = filepath.Join(cfg.GOROOTpkg, "tool", full)
}
}
if p.Target != "" && cfg.BuildContext.GOOS == "windows" {
p.Target += ".exe"
}
} else if p.Internal.Local {
// Local import turned into absolute path.
// No permanent install target.
p.Target = ""
} else {
p.Target = p.Internal.Build.PkgObj
if cfg.BuildLinkshared && p.Target != "" {
// TODO(bcmills): The reliance on p.Target implies that -linkshared does
// not work for any package that lacks a Target — such as a non-main
// package in module mode. We should probably fix that.
shlibnamefile := p.Target[:len(p.Target)-2] + ".shlibname"
shlib, err := os.ReadFile(shlibnamefile)
if err != nil && !os.IsNotExist(err) {
base.Fatalf("reading shlibname: %v", err)
}
if err == nil {
libname := strings.TrimSpace(string(shlib))
if cfg.BuildContext.Compiler == "gccgo" {
p.Shlib = filepath.Join(p.Internal.Build.PkgTargetRoot, "shlibs", libname)
} else {
p.Shlib = filepath.Join(p.Internal.Build.PkgTargetRoot, libname)
}
}
}
}
// Build augmented import list to add implicit dependencies.
// Be careful not to add imports twice, just to avoid confusion.
importPaths := p.Imports
addImport := func(path string, forCompiler bool) {
for _, p := range importPaths {
if path == p {
return
}
}
importPaths = append(importPaths, path)
if forCompiler {
p.Internal.CompiledImports = append(p.Internal.CompiledImports, path)
}
}
if !opts.IgnoreImports {
// Cgo translation adds imports of "unsafe", "runtime/cgo" and "syscall",
// except for certain packages, to avoid circular dependencies.
if p.UsesCgo() {
addImport("unsafe", true)
}
if p.UsesCgo() && (!p.Standard || !cgoExclude[p.ImportPath]) && cfg.BuildContext.Compiler != "gccgo" {
addImport("runtime/cgo", true)
}
if p.UsesCgo() && (!p.Standard || !cgoSyscallExclude[p.ImportPath]) {
addImport("syscall", true)
}
// SWIG adds imports of some standard packages.
if p.UsesSwig() {
addImport("unsafe", true)
if cfg.BuildContext.Compiler != "gccgo" {
addImport("runtime/cgo", true)
}
addImport("syscall", true)
addImport("sync", true)
// TODO: The .swig and .swigcxx files can use
// %go_import directives to import other packages.
}
// The linker loads implicit dependencies.
if p.Name == "main" && !p.Internal.ForceLibrary {
for _, dep := range LinkerDeps(p) {
addImport(dep, false)
}
}
}
// Check for case-insensitive collisions of import paths.
fold := str.ToFold(p.ImportPath)
if other := foldPath[fold]; other == "" {
foldPath[fold] = p.ImportPath
} else if other != p.ImportPath {
setError(ImportErrorf(p.ImportPath, "case-insensitive import collision: %q and %q", p.ImportPath, other))
return
}
if !SafeArg(p.ImportPath) {
setError(ImportErrorf(p.ImportPath, "invalid import path %q", p.ImportPath))
return
}
// Errors after this point are caused by this package, not the importing
// package. Pushing the path here prevents us from reporting the error
// with the position of the import declaration.
stk.Push(path)
defer stk.Pop()
pkgPath := p.ImportPath
if p.Internal.CmdlineFiles {
pkgPath = "command-line-arguments"
}
if cfg.ModulesEnabled {
p.Module = modload.PackageModuleInfo(ctx, pkgPath)
}
p.EmbedFiles, p.Internal.Embed, err = resolveEmbed(p.Dir, p.EmbedPatterns)
if err != nil {
p.Incomplete = true
setError(err)
embedErr := err.(*EmbedError)
p.Error.setPos(p.Internal.Build.EmbedPatternPos[embedErr.Pattern])
}
// Check for case-insensitive collision of input files.
// To avoid problems on case-insensitive files, we reject any package
// where two different input files have equal names under a case-insensitive
// comparison.
inputs := p.AllFiles()
f1, f2 := str.FoldDup(inputs)
if f1 != "" {
setError(fmt.Errorf("case-insensitive file name collision: %q and %q", f1, f2))
return
}
// If first letter of input file is ASCII, it must be alphanumeric.
// This avoids files turning into flags when invoking commands,
// and other problems we haven't thought of yet.
// Also, _cgo_ files must be generated by us, not supplied.
// They are allowed to have //go:cgo_ldflag directives.
// The directory scan ignores files beginning with _,
// so we shouldn't see any _cgo_ files anyway, but just be safe.
for _, file := range inputs {
if !SafeArg(file) || strings.HasPrefix(file, "_cgo_") {
setError(fmt.Errorf("invalid input file name %q", file))
return
}
}
if name := pathpkg.Base(p.ImportPath); !SafeArg(name) {
setError(fmt.Errorf("invalid input directory name %q", name))
return
}
// Build list of imported packages and full dependency list.
imports := make([]*Package, 0, len(p.Imports))
for i, path := range importPaths {
if path == "C" {
continue
}
p1 := LoadImport(ctx, opts, path, p.Dir, p, stk, p.Internal.Build.ImportPos[path], ResolveImport)
path = p1.ImportPath
importPaths[i] = path
if i < len(p.Imports) {
p.Imports[i] = path
}
imports = append(imports, p1)
if p1.Incomplete {
p.Incomplete = true
}
}
p.Internal.Imports = imports
if !opts.SuppressDeps {
p.collectDeps()
}
if p.Error == nil && p.Name == "main" && !p.Internal.ForceLibrary && len(p.DepsErrors) == 0 && !opts.SuppressBuildInfo {
// TODO(bcmills): loading VCS metadata can be fairly slow.
// Consider starting this as a background goroutine and retrieving the result
// asynchronously when we're actually ready to build the package, or when we
// actually need to evaluate whether the package's metadata is stale.
p.setBuildInfo(opts.LoadVCS)
}
// unsafe is a fake package.
if p.Standard && (p.ImportPath == "unsafe" || cfg.BuildContext.Compiler == "gccgo") {
p.Target = ""
}
// If cgo is not enabled, ignore cgo supporting sources
// just as we ignore go files containing import "C".
if !cfg.BuildContext.CgoEnabled {
p.CFiles = nil
p.CXXFiles = nil
p.MFiles = nil
p.SwigFiles = nil
p.SwigCXXFiles = nil
// Note that SFiles are okay (they go to the Go assembler)
// and HFiles are okay (they might be used by the SFiles).
// Also Sysofiles are okay (they might not contain object
// code; see issue #16050).
}
// The gc toolchain only permits C source files with cgo or SWIG.
if len(p.CFiles) > 0 && !p.UsesCgo() && !p.UsesSwig() && cfg.BuildContext.Compiler == "gc" {
setError(fmt.Errorf("C source files not allowed when not using cgo or SWIG: %s", strings.Join(p.CFiles, " ")))
return
}
// C++, Objective-C, and Fortran source files are permitted only with cgo or SWIG,
// regardless of toolchain.
if len(p.CXXFiles) > 0 && !p.UsesCgo() && !p.UsesSwig() {
setError(fmt.Errorf("C++ source files not allowed when not using cgo or SWIG: %s", strings.Join(p.CXXFiles, " ")))
return
}
if len(p.MFiles) > 0 && !p.UsesCgo() && !p.UsesSwig() {
setError(fmt.Errorf("Objective-C source files not allowed when not using cgo or SWIG: %s", strings.Join(p.MFiles, " ")))
return
}
if len(p.FFiles) > 0 && !p.UsesCgo() && !p.UsesSwig() {
setError(fmt.Errorf("Fortran source files not allowed when not using cgo or SWIG: %s", strings.Join(p.FFiles, " ")))
return
}
}
// An EmbedError indicates a problem with a go:embed directive.
type EmbedError struct {
Pattern string
Err error
}
func (e *EmbedError) Error() string {
return fmt.Sprintf("pattern %s: %v", e.Pattern, e.Err)
}
func (e *EmbedError) Unwrap() error {
return e.Err
}
// ResolveEmbed resolves //go:embed patterns and returns only the file list.
// For use by go mod vendor to find embedded files it should copy into the
// vendor directory.
// TODO(#42504): Once go mod vendor uses load.PackagesAndErrors, just
// call (*Package).ResolveEmbed
func ResolveEmbed(dir string, patterns []string) ([]string, error) {
files, _, err := resolveEmbed(dir, patterns)
return files, err
}
// resolveEmbed resolves //go:embed patterns to precise file lists.
// It sets files to the list of unique files matched (for go list),
// and it sets pmap to the more precise mapping from
// patterns to files.
func resolveEmbed(pkgdir string, patterns []string) (files []string, pmap map[string][]string, err error) {
var pattern string
defer func() {
if err != nil {
err = &EmbedError{
Pattern: pattern,
Err: err,
}
}
}()
// TODO(rsc): All these messages need position information for better error reports.
pmap = make(map[string][]string)
have := make(map[string]int)
dirOK := make(map[string]bool)
pid := 0 // pattern ID, to allow reuse of have map
for _, pattern = range patterns {
pid++
glob := pattern
all := strings.HasPrefix(pattern, "all:")
if all {
glob = pattern[len("all:"):]
}
// Check pattern is valid for //go:embed.
if _, err := path.Match(glob, ""); err != nil || !validEmbedPattern(glob) {
return nil, nil, fmt.Errorf("invalid pattern syntax")
}
// Glob to find matches.
match, err := fsys.Glob(str.QuoteGlob(pkgdir) + string(filepath.Separator) + filepath.FromSlash(glob))
if err != nil {
return nil, nil, err
}
// Filter list of matches down to the ones that will still exist when
// the directory is packaged up as a module. (If p.Dir is in the module cache,
// only those files exist already, but if p.Dir is in the current module,
// then there may be other things lying around, like symbolic links or .git directories.)
var list []string
for _, file := range match {
// relative path to p.Dir which begins without prefix slash
rel := filepath.ToSlash(str.TrimFilePathPrefix(file, pkgdir))
what := "file"
info, err := fsys.Lstat(file)
if err != nil {
return nil, nil, err
}
if info.IsDir() {
what = "directory"
}
// Check that directories along path do not begin a new module
// (do not contain a go.mod).
for dir := file; len(dir) > len(pkgdir)+1 && !dirOK[dir]; dir = filepath.Dir(dir) {
if _, err := fsys.Stat(filepath.Join(dir, "go.mod")); err == nil {
return nil, nil, fmt.Errorf("cannot embed %s %s: in different module", what, rel)
}
if dir != file {
if info, err := fsys.Lstat(dir); err == nil && !info.IsDir() {
return nil, nil, fmt.Errorf("cannot embed %s %s: in non-directory %s", what, rel, dir[len(pkgdir)+1:])
}
}
dirOK[dir] = true
if elem := filepath.Base(dir); isBadEmbedName(elem) {
if dir == file {
return nil, nil, fmt.Errorf("cannot embed %s %s: invalid name %s", what, rel, elem)
} else {
return nil, nil, fmt.Errorf("cannot embed %s %s: in invalid directory %s", what, rel, elem)
}
}
}
switch {
default:
return nil, nil, fmt.Errorf("cannot embed irregular file %s", rel)
case info.Mode().IsRegular():
if have[rel] != pid {
have[rel] = pid
list = append(list, rel)
}
case info.IsDir():
// Gather all files in the named directory, stopping at module boundaries
// and ignoring files that wouldn't be packaged into a module.
count := 0
err := fsys.Walk(file, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
rel := filepath.ToSlash(str.TrimFilePathPrefix(path, pkgdir))
name := info.Name()
if path != file && (isBadEmbedName(name) || ((name[0] == '.' || name[0] == '_') && !all)) {
// Ignore bad names, assuming they won't go into modules.
// Also avoid hidden files that user may not know about.
// See golang.org/issue/42328.
if info.IsDir() {
return fs.SkipDir
}
return nil
}
if info.IsDir() {
if _, err := fsys.Stat(filepath.Join(path, "go.mod")); err == nil {
return filepath.SkipDir
}
return nil
}
if !info.Mode().IsRegular() {
return nil
}
count++
if have[rel] != pid {
have[rel] = pid
list = append(list, rel)
}
return nil
})
if err != nil {
return nil, nil, err
}
if count == 0 {
return nil, nil, fmt.Errorf("cannot embed directory %s: contains no embeddable files", rel)
}
}
}
if len(list) == 0 {
return nil, nil, fmt.Errorf("no matching files found")
}
sort.Strings(list)
pmap[pattern] = list
}
for file := range have {
files = append(files, file)
}
sort.Strings(files)
return files, pmap, nil
}
func validEmbedPattern(pattern string) bool {
return pattern != "." && fs.ValidPath(pattern)
}
// isBadEmbedName reports whether name is the base name of a file that
// can't or won't be included in modules and therefore shouldn't be treated
// as existing for embedding.
func isBadEmbedName(name string) bool {
if err := module.CheckFilePath(name); err != nil {
return true
}
switch name {
// Empty string should be impossible but make it bad.
case "":
return true
// Version control directories won't be present in module.
case ".bzr", ".hg", ".git", ".svn":
return true
}
return false
}
// collectDeps populates p.Deps and p.DepsErrors by iterating over
// p.Internal.Imports.
//
// TODO(jayconrod): collectDeps iterates over transitive imports for every
// package. We should only need to visit direct imports.
func (p *Package) collectDeps() {
deps := make(map[string]*Package)
var q []*Package
q = append(q, p.Internal.Imports...)
for i := 0; i < len(q); i++ {
p1 := q[i]
path := p1.ImportPath
// The same import path could produce an error or not,
// depending on what tries to import it.
// Prefer to record entries with errors, so we can report them.
p0 := deps[path]
if p0 == nil || p1.Error != nil && (p0.Error == nil || len(p0.Error.ImportStack) > len(p1.Error.ImportStack)) {
deps[path] = p1
for _, p2 := range p1.Internal.Imports {
if deps[p2.ImportPath] != p2 {
q = append(q, p2)
}
}
}
}
p.Deps = make([]string, 0, len(deps))
for dep := range deps {
p.Deps = append(p.Deps, dep)
}
sort.Strings(p.Deps)
for _, dep := range p.Deps {
p1 := deps[dep]
if p1 == nil {
panic("impossible: missing entry in package cache for " + dep + " imported by " + p.ImportPath)
}
if p1.Error != nil {
p.DepsErrors = append(p.DepsErrors, p1.Error)
}
}
}
// vcsStatusCache maps repository directories (string)
// to their VCS information (vcsStatusError).
var vcsStatusCache par.Cache
// setBuildInfo gathers build information, formats it as a string to be
// embedded in the binary, then sets p.Internal.BuildInfo to that string.
// setBuildInfo should only be called on a main package with no errors.
//
// This information can be retrieved using debug.ReadBuildInfo.
//
// Note that the GoVersion field is not set here to avoid encoding it twice.
// It is stored separately in the binary, mostly for historical reasons.
func (p *Package) setBuildInfo(includeVCS bool) {
setPkgErrorf := func(format string, args ...any) {
if p.Error == nil {
p.Error = &PackageError{Err: fmt.Errorf(format, args...)}
}
}
var debugModFromModinfo func(*modinfo.ModulePublic) *debug.Module
debugModFromModinfo = func(mi *modinfo.ModulePublic) *debug.Module {
version := mi.Version
if version == "" {
version = "(devel)"
}
dm := &debug.Module{
Path: mi.Path,
Version: version,
}
if mi.Replace != nil {
dm.Replace = debugModFromModinfo(mi.Replace)
} else if mi.Version != "" {
dm.Sum = modfetch.Sum(module.Version{Path: mi.Path, Version: mi.Version})
}
return dm
}
var main debug.Module
if p.Module != nil {
main = *debugModFromModinfo(p.Module)
}
visited := make(map[*Package]bool)
mdeps := make(map[module.Version]*debug.Module)
var q []*Package
q = append(q, p.Internal.Imports...)
for len(q) > 0 {
p1 := q[0]
q = q[1:]
if visited[p1] {
continue
}
visited[p1] = true
if p1.Module != nil {
m := module.Version{Path: p1.Module.Path, Version: p1.Module.Version}
if p1.Module.Path != main.Path && mdeps[m] == nil {
mdeps[m] = debugModFromModinfo(p1.Module)
}
}
q = append(q, p1.Internal.Imports...)
}
sortedMods := make([]module.Version, 0, len(mdeps))
for mod := range mdeps {
sortedMods = append(sortedMods, mod)
}
module.Sort(sortedMods)
deps := make([]*debug.Module, len(sortedMods))
for i, mod := range sortedMods {
deps[i] = mdeps[mod]
}
pkgPath := p.ImportPath
if p.Internal.CmdlineFiles {
pkgPath = "command-line-arguments"
}
info := &debug.BuildInfo{
Path: pkgPath,
Main: main,
Deps: deps,
}
appendSetting := func(key, value string) {
value = strings.ReplaceAll(value, "\n", " ") // make value safe
info.Settings = append(info.Settings, debug.BuildSetting{Key: key, Value: value})
}
// Add command-line flags relevant to the build.
// This is informational, not an exhaustive list.
// Please keep the list sorted.
if cfg.BuildASan {
appendSetting("-asan", "true")
}
if BuildAsmflags.present {
appendSetting("-asmflags", BuildAsmflags.String())
}
appendSetting("-compiler", cfg.BuildContext.Compiler)
if gccgoflags := BuildGccgoflags.String(); gccgoflags != "" && cfg.BuildContext.Compiler == "gccgo" {
appendSetting("-gccgoflags", gccgoflags)
}
if gcflags := BuildGcflags.String(); gcflags != "" && cfg.BuildContext.Compiler == "gc" {
appendSetting("-gcflags", gcflags)
}
if ldflags := BuildLdflags.String(); ldflags != "" {
// https://go.dev/issue/52372: only include ldflags if -trimpath is not set,
// since it can include system paths through various linker flags (notably
// -extar, -extld, and -extldflags).
//
// TODO: since we control cmd/link, in theory we can parse ldflags to
// determine whether they may refer to system paths. If we do that, we can
// redact only those paths from the recorded -ldflags setting and still
// record the system-independent parts of the flags.
if !cfg.BuildTrimpath {
appendSetting("-ldflags", ldflags)
}
}
if cfg.BuildMSan {
appendSetting("-msan", "true")
}
if cfg.BuildRace {
appendSetting("-race", "true")
}
if tags := cfg.BuildContext.BuildTags; len(tags) > 0 {
appendSetting("-tags", strings.Join(tags, ","))
}
if cfg.BuildTrimpath {
appendSetting("-trimpath", "true")
}
cgo := "0"
if cfg.BuildContext.CgoEnabled {
cgo = "1"
}
appendSetting("CGO_ENABLED", cgo)
// https://go.dev/issue/52372: only include CGO flags if -trimpath is not set.
// (If -trimpath is set, it is possible that these flags include system paths.)
// If cgo is involved, reproducibility is already pretty well ruined anyway,
// given that we aren't stamping header or library versions.
//
// TODO(bcmills): perhaps we could at least parse the flags and stamp the
// subset of flags that are known not to be paths?
if cfg.BuildContext.CgoEnabled && !cfg.BuildTrimpath {
for _, name := range []string{"CGO_CFLAGS", "CGO_CPPFLAGS", "CGO_CXXFLAGS", "CGO_LDFLAGS"} {
appendSetting(name, cfg.Getenv(name))
}
}
appendSetting("GOARCH", cfg.BuildContext.GOARCH)
if cfg.RawGOEXPERIMENT != "" {
appendSetting("GOEXPERIMENT", cfg.RawGOEXPERIMENT)
}
appendSetting("GOOS", cfg.BuildContext.GOOS)
if key, val := cfg.GetArchEnv(); key != "" && val != "" {
appendSetting(key, val)
}
// Add VCS status if all conditions are true:
//
// - -buildvcs is enabled.
// - p is a non-test contained within a main module (there may be multiple
// main modules in a workspace, but local replacements don't count).
// - Both the current directory and p's module's root directory are contained
// in the same local repository.
// - We know the VCS commands needed to get the status.
setVCSError := func(err error) {
setPkgErrorf("error obtaining VCS status: %v\n\tUse -buildvcs=false to disable VCS stamping.", err)
}
var repoDir string
var vcsCmd *vcs.Cmd
var err error
const allowNesting = true
if includeVCS && cfg.BuildBuildvcs != "false" && p.Module != nil && p.Module.Version == "" && !p.Standard && !p.IsTestOnly() {
repoDir, vcsCmd, err = vcs.FromDir(base.Cwd(), "", allowNesting)
if err != nil && !errors.Is(err, os.ErrNotExist) {
setVCSError(err)
return
}
if !str.HasFilePathPrefix(p.Module.Dir, repoDir) &&
!str.HasFilePathPrefix(repoDir, p.Module.Dir) {
// The module containing the main package does not overlap with the
// repository containing the working directory. Don't include VCS info.
// If the repo contains the module or vice versa, but they are not
// the same directory, it's likely an error (see below).
goto omitVCS
}
if cfg.BuildBuildvcs == "auto" && vcsCmd != nil && vcsCmd.Cmd != "" {
if _, err := exec.LookPath(vcsCmd.Cmd); err != nil {
// We fould a repository, but the required VCS tool is not present.
// "-buildvcs=auto" means that we should silently drop the VCS metadata.
goto omitVCS
}
}
}
if repoDir != "" && vcsCmd.Status != nil {
// Check that the current directory, package, and module are in the same
// repository. vcs.FromDir allows nested Git repositories, but nesting
// is not allowed for other VCS tools. The current directory may be outside
// p.Module.Dir when a workspace is used.
pkgRepoDir, _, err := vcs.FromDir(p.Dir, "", allowNesting)
if err != nil {
setVCSError(err)
return
}
if pkgRepoDir != repoDir {
if cfg.BuildBuildvcs != "auto" {
setVCSError(fmt.Errorf("main package is in repository %q but current directory is in repository %q", pkgRepoDir, repoDir))
return
}
goto omitVCS
}
modRepoDir, _, err := vcs.FromDir(p.Module.Dir, "", allowNesting)
if err != nil {
setVCSError(err)
return
}
if modRepoDir != repoDir {
if cfg.BuildBuildvcs != "auto" {
setVCSError(fmt.Errorf("main module is in repository %q but current directory is in repository %q", modRepoDir, repoDir))
return
}
goto omitVCS
}
type vcsStatusError struct {
Status vcs.Status
Err error
}
cached := vcsStatusCache.Do(repoDir, func() any {
st, err := vcsCmd.Status(vcsCmd, repoDir)
return vcsStatusError{st, err}
}).(vcsStatusError)
if err := cached.Err; err != nil {
setVCSError(err)
return
}
st := cached.Status
appendSetting("vcs", vcsCmd.Cmd)
if st.Revision != "" {
appendSetting("vcs.revision", st.Revision)
}
if !st.CommitTime.IsZero() {
stamp := st.CommitTime.UTC().Format(time.RFC3339Nano)
appendSetting("vcs.time", stamp)
}
appendSetting("vcs.modified", strconv.FormatBool(st.Uncommitted))
}
omitVCS:
p.Internal.BuildInfo = info.String()
}
// SafeArg reports whether arg is a "safe" command-line argument,
// meaning that when it appears in a command-line, it probably
// doesn't have some special meaning other than its own name.
// Obviously args beginning with - are not safe (they look like flags).
// Less obviously, args beginning with @ are not safe (they look like
// GNU binutils flagfile specifiers, sometimes called "response files").
// To be conservative, we reject almost any arg beginning with non-alphanumeric ASCII.
// We accept leading . _ and / as likely in file system paths.
// There is a copy of this function in cmd/compile/internal/gc/noder.go.
func SafeArg(name string) bool {
if name == "" {
return false
}
c := name[0]
return '0' <= c && c <= '9' || 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || c == '.' || c == '_' || c == '/' || c >= utf8.RuneSelf
}
// LinkerDeps returns the list of linker-induced dependencies for main package p.
func LinkerDeps(p *Package) []string {
// Everything links runtime.
deps := []string{"runtime"}
// External linking mode forces an import of runtime/cgo.
if externalLinkingForced(p) && cfg.BuildContext.Compiler != "gccgo" {
deps = append(deps, "runtime/cgo")
}
// On ARM with GOARM=5, it forces an import of math, for soft floating point.
if cfg.Goarch == "arm" {
deps = append(deps, "math")
}
// Using the race detector forces an import of runtime/race.
if cfg.BuildRace {
deps = append(deps, "runtime/race")
}
// Using memory sanitizer forces an import of runtime/msan.
if cfg.BuildMSan {
deps = append(deps, "runtime/msan")
}
// Using address sanitizer forces an import of runtime/asan.
if cfg.BuildASan {
deps = append(deps, "runtime/asan")
}
return deps
}
// externalLinkingForced reports whether external linking is being
// forced even for programs that do not use cgo.
func externalLinkingForced(p *Package) bool {
if !cfg.BuildContext.CgoEnabled {
return false
}
// Some targets must use external linking even inside GOROOT.
switch cfg.BuildContext.GOOS {
case "android":
if cfg.BuildContext.GOARCH != "arm64" {
return true
}
case "ios":
return true
}
// Currently build modes c-shared, pie (on systems that do not
// support PIE with internal linking mode (currently all
// systems: issue #18968)), plugin, and -linkshared force
// external linking mode, as of course does
// -ldflags=-linkmode=external. External linking mode forces
// an import of runtime/cgo.
// If there are multiple -linkmode options, the last one wins.
pieCgo := cfg.BuildBuildmode == "pie" && !sys.InternalLinkPIESupported(cfg.BuildContext.GOOS, cfg.BuildContext.GOARCH)
linkmodeExternal := false
if p != nil {
ldflags := BuildLdflags.For(p)
for i := len(ldflags) - 1; i >= 0; i-- {
a := ldflags[i]
if a == "-linkmode=external" ||
a == "-linkmode" && i+1 < len(ldflags) && ldflags[i+1] == "external" {
linkmodeExternal = true
break
} else if a == "-linkmode=internal" ||
a == "-linkmode" && i+1 < len(ldflags) && ldflags[i+1] == "internal" {
break
}
}
}
return cfg.BuildBuildmode == "c-shared" || cfg.BuildBuildmode == "plugin" || pieCgo || cfg.BuildLinkshared || linkmodeExternal
}
// mkAbs rewrites list, which must be paths relative to p.Dir,
// into a sorted list of absolute paths. It edits list in place but for
// convenience also returns list back to its caller.
func (p *Package) mkAbs(list []string) []string {
for i, f := range list {
list[i] = filepath.Join(p.Dir, f)
}
sort.Strings(list)
return list
}
// InternalGoFiles returns the list of Go files being built for the package,
// using absolute paths.
func (p *Package) InternalGoFiles() []string {
return p.mkAbs(str.StringList(p.GoFiles, p.CgoFiles, p.TestGoFiles))
}
// InternalXGoFiles returns the list of Go files being built for the XTest package,
// using absolute paths.
func (p *Package) InternalXGoFiles() []string {
return p.mkAbs(p.XTestGoFiles)
}
// InternalGoFiles returns the list of all Go files possibly relevant for the package,
// using absolute paths. "Possibly relevant" means that files are not excluded
// due to build tags, but files with names beginning with . or _ are still excluded.
func (p *Package) InternalAllGoFiles() []string {
return p.mkAbs(str.StringList(p.IgnoredGoFiles, p.GoFiles, p.CgoFiles, p.TestGoFiles, p.XTestGoFiles))
}
// usesSwig reports whether the package needs to run SWIG.
func (p *Package) UsesSwig() bool {
return len(p.SwigFiles) > 0 || len(p.SwigCXXFiles) > 0
}
// usesCgo reports whether the package needs to run cgo
func (p *Package) UsesCgo() bool {
return len(p.CgoFiles) > 0
}
// PackageList returns the list of packages in the dag rooted at roots
// as visited in a depth-first post-order traversal.
func PackageList(roots []*Package) []*Package {
seen := map[*Package]bool{}
all := []*Package{}
var walk func(*Package)
walk = func(p *Package) {
if seen[p] {
return
}
seen[p] = true
for _, p1 := range p.Internal.Imports {
walk(p1)
}
all = append(all, p)
}
for _, root := range roots {
walk(root)
}
return all
}
// TestPackageList returns the list of packages in the dag rooted at roots
// as visited in a depth-first post-order traversal, including the test
// imports of the roots. This ignores errors in test packages.
func TestPackageList(ctx context.Context, opts PackageOpts, roots []*Package) []*Package {
seen := map[*Package]bool{}
all := []*Package{}
var walk func(*Package)
walk = func(p *Package) {
if seen[p] {
return
}
seen[p] = true
for _, p1 := range p.Internal.Imports {
walk(p1)
}
all = append(all, p)
}
walkTest := func(root *Package, path string) {
var stk ImportStack
p1 := LoadImport(ctx, opts, path, root.Dir, root, &stk, root.Internal.Build.TestImportPos[path], ResolveImport)
if p1.Error == nil {
walk(p1)
}
}
for _, root := range roots {
walk(root)
for _, path := range root.TestImports {
walkTest(root, path)
}
for _, path := range root.XTestImports {
walkTest(root, path)
}
}
return all
}
// LoadImportWithFlags loads the package with the given import path and
// sets tool flags on that package. This function is useful loading implicit
// dependencies (like sync/atomic for coverage).
// TODO(jayconrod): delete this function and set flags automatically
// in LoadImport instead.
func LoadImportWithFlags(path, srcDir string, parent *Package, stk *ImportStack, importPos []token.Position, mode int) *Package {
p := LoadImport(context.TODO(), PackageOpts{}, path, srcDir, parent, stk, importPos, mode)
setToolFlags(p)
return p
}
// PackageOpts control the behavior of PackagesAndErrors and other package
// loading functions.
type PackageOpts struct {
// IgnoreImports controls whether we ignore explicit and implicit imports
// when loading packages. Implicit imports are added when supporting Cgo
// or SWIG and when linking main packages.
IgnoreImports bool
// ModResolveTests indicates whether calls to the module loader should also
// resolve test dependencies of the requested packages.
//
// If ModResolveTests is true, then the module loader needs to resolve test
// dependencies at the same time as packages; otherwise, the test dependencies
// of those packages could be missing, and resolving those missing dependencies
// could change the selected versions of modules that provide other packages.
ModResolveTests bool
// MainOnly is true if the caller only wants to load main packages.
// For a literal argument matching a non-main package, a stub may be returned
// with an error. For a non-literal argument (with "..."), non-main packages
// are not be matched, and their dependencies may not be loaded. A warning
// may be printed for non-literal arguments that match no main packages.
MainOnly bool
// LoadVCS controls whether we also load version-control metadata for main packages.
LoadVCS bool
// SuppressDeps is true if the caller does not need Deps and DepsErrors to be populated
// on the package. TestPackagesAndErrors examines the Deps field to determine if the test
// variant has an import cycle, so SuppressDeps should not be set if TestPackagesAndErrors
// will be called on the package.
SuppressDeps bool
// SuppressBuildInfo is true if the caller does not need p.Stale, p.StaleReason, or p.Internal.BuildInfo
// to be populated on the package.
SuppressBuildInfo bool
}
// PackagesAndErrors returns the packages named by the command line arguments
// 'patterns'. If a named package cannot be loaded, PackagesAndErrors returns
// a *Package with the Error field describing the failure. If errors are found
// loading imported packages, the DepsErrors field is set. The Incomplete field
// may be set as well.
//
// To obtain a flat list of packages, use PackageList.
// To report errors loading packages, use ReportPackageErrors.
func PackagesAndErrors(ctx context.Context, opts PackageOpts, patterns []string) []*Package {
ctx, span := trace.StartSpan(ctx, "load.PackagesAndErrors")
defer span.Done()
for _, p := range patterns {
// Listing is only supported with all patterns referring to either:
// - Files that are part of the same directory.
// - Explicit package paths or patterns.
if strings.HasSuffix(p, ".go") {
// We need to test whether the path is an actual Go file and not a
// package path or pattern ending in '.go' (see golang.org/issue/34653).
if fi, err := fsys.Stat(p); err == nil && !fi.IsDir() {
return []*Package{GoFilesPackage(ctx, opts, patterns)}
}
}
}
var matches []*search.Match
if modload.Init(); cfg.ModulesEnabled {
modOpts := modload.PackageOpts{
ResolveMissingImports: true,
LoadTests: opts.ModResolveTests,
SilencePackageErrors: true,
}
matches, _ = modload.LoadPackages(ctx, modOpts, patterns...)
} else {
noModRoots := []string{}
matches = search.ImportPaths(patterns, noModRoots)
}
var (
pkgs []*Package
stk ImportStack
seenPkg = make(map[*Package]bool)
)
pre := newPreload()
defer pre.flush()
pre.preloadMatches(ctx, opts, matches)
for _, m := range matches {
for _, pkg := range m.Pkgs {
if pkg == "" {
panic(fmt.Sprintf("ImportPaths returned empty package for pattern %s", m.Pattern()))
}
p := loadImport(ctx, opts, pre, pkg, base.Cwd(), nil, &stk, nil, 0)
p.Match = append(p.Match, m.Pattern())
p.Internal.CmdlinePkg = true
if m.IsLiteral() {
// Note: do not set = m.IsLiteral unconditionally
// because maybe we'll see p matching both
// a literal and also a non-literal pattern.
p.Internal.CmdlinePkgLiteral = true
}
if seenPkg[p] {
continue
}
seenPkg[p] = true
pkgs = append(pkgs, p)
}
if len(m.Errs) > 0 {
// In addition to any packages that were actually resolved from the
// pattern, there was some error in resolving the pattern itself.
// Report it as a synthetic package.
p := new(Package)
p.ImportPath = m.Pattern()
// Pass an empty ImportStack and nil importPos: the error arose from a pattern, not an import.
var stk ImportStack
var importPos []token.Position
p.setLoadPackageDataError(m.Errs[0], m.Pattern(), &stk, importPos)
p.Incomplete = true
p.Match = append(p.Match, m.Pattern())
p.Internal.CmdlinePkg = true
if m.IsLiteral() {
p.Internal.CmdlinePkgLiteral = true
}
pkgs = append(pkgs, p)
}
}
if opts.MainOnly {
pkgs = mainPackagesOnly(pkgs, matches)
}
// Now that CmdlinePkg is set correctly,
// compute the effective flags for all loaded packages
// (not just the ones matching the patterns but also
// their dependencies).
setToolFlags(pkgs...)
return pkgs
}
// CheckPackageErrors prints errors encountered loading pkgs and their
// dependencies, then exits with a non-zero status if any errors were found.
func CheckPackageErrors(pkgs []*Package) {
printed := map[*PackageError]bool{}
for _, pkg := range pkgs {
if pkg.Error != nil {
base.Errorf("%v", pkg.Error)
printed[pkg.Error] = true
}
for _, err := range pkg.DepsErrors {
// Since these are errors in dependencies,
// the same error might show up multiple times,
// once in each package that depends on it.
// Only print each once.
if !printed[err] {
printed[err] = true
base.Errorf("%v", err)
}
}
}
base.ExitIfErrors()
// Check for duplicate loads of the same package.
// That should be impossible, but if it does happen then
// we end up trying to build the same package twice,
// usually in parallel overwriting the same files,
// which doesn't work very well.
seen := map[string]bool{}
reported := map[string]bool{}
for _, pkg := range PackageList(pkgs) {
if seen[pkg.ImportPath] && !reported[pkg.ImportPath] {
reported[pkg.ImportPath] = true
base.Errorf("internal error: duplicate loads of %s", pkg.ImportPath)
}
seen[pkg.ImportPath] = true
}
base.ExitIfErrors()
}
// mainPackagesOnly filters out non-main packages matched only by arguments
// containing "..." and returns the remaining main packages.
//
// Packages with missing, invalid, or ambiguous names may be treated as
// possibly-main packages.
//
// mainPackagesOnly sets a non-main package's Error field and returns it if it
// is named by a literal argument.
//
// mainPackagesOnly prints warnings for non-literal arguments that only match
// non-main packages.
func mainPackagesOnly(pkgs []*Package, matches []*search.Match) []*Package {
treatAsMain := map[string]bool{}
for _, m := range matches {
if m.IsLiteral() {
for _, path := range m.Pkgs {
treatAsMain[path] = true
}
}
}
var mains []*Package
for _, pkg := range pkgs {
if pkg.Name == "main" {
treatAsMain[pkg.ImportPath] = true
mains = append(mains, pkg)
continue
}
if len(pkg.InvalidGoFiles) > 0 { // TODO(#45999): && pkg.Name == "", but currently go/build sets pkg.Name arbitrarily if it is ambiguous.
// The package has (or may have) conflicting names, and we can't easily
// tell whether one of them is "main". So assume that it could be, and
// report an error for the package.
treatAsMain[pkg.ImportPath] = true
}
if treatAsMain[pkg.ImportPath] {
if pkg.Error == nil {
pkg.Error = &PackageError{Err: &mainPackageError{importPath: pkg.ImportPath}}
}
mains = append(mains, pkg)
}
}
for _, m := range matches {
if m.IsLiteral() || len(m.Pkgs) == 0 {
continue
}
foundMain := false
for _, path := range m.Pkgs {
if treatAsMain[path] {
foundMain = true
break
}
}
if !foundMain {
fmt.Fprintf(os.Stderr, "go: warning: %q matched only non-main packages\n", m.Pattern())
}
}
return mains
}
type mainPackageError struct {
importPath string
}
func (e *mainPackageError) Error() string {
return fmt.Sprintf("package %s is not a main package", e.importPath)
}
func (e *mainPackageError) ImportPath() string {
return e.importPath
}
func setToolFlags(pkgs ...*Package) {
for _, p := range PackageList(pkgs) {
p.Internal.Asmflags = BuildAsmflags.For(p)
p.Internal.Gcflags = BuildGcflags.For(p)
p.Internal.Ldflags = BuildLdflags.For(p)
p.Internal.Gccgoflags = BuildGccgoflags.For(p)
}
}
// GoFilesPackage creates a package for building a collection of Go files
// (typically named on the command line). The target is named p.a for
// package p or named after the first Go file for package main.
func GoFilesPackage(ctx context.Context, opts PackageOpts, gofiles []string) *Package {
modload.Init()
for _, f := range gofiles {
if !strings.HasSuffix(f, ".go") {
pkg := new(Package)
pkg.Internal.Local = true
pkg.Internal.CmdlineFiles = true
pkg.Name = f
pkg.Error = &PackageError{
Err: fmt.Errorf("named files must be .go files: %s", pkg.Name),
}
return pkg
}
}
var stk ImportStack
ctxt := cfg.BuildContext
ctxt.UseAllFiles = true
// Synthesize fake "directory" that only shows the named files,
// to make it look like this is a standard package or
// command directory. So that local imports resolve
// consistently, the files must all be in the same directory.
var dirent []fs.FileInfo
var dir string
for _, file := range gofiles {
fi, err := fsys.Stat(file)
if err != nil {
base.Fatalf("%s", err)
}
if fi.IsDir() {
base.Fatalf("%s is a directory, should be a Go file", file)
}
dir1 := filepath.Dir(file)
if dir == "" {
dir = dir1
} else if dir != dir1 {
base.Fatalf("named files must all be in one directory; have %s and %s", dir, dir1)
}
dirent = append(dirent, fi)
}
ctxt.ReadDir = func(string) ([]fs.FileInfo, error) { return dirent, nil }
if cfg.ModulesEnabled {
modload.ImportFromFiles(ctx, gofiles)
}
var err error
if dir == "" {
dir = base.Cwd()
}
dir, err = filepath.Abs(dir)
if err != nil {
base.Fatalf("%s", err)
}
bp, err := ctxt.ImportDir(dir, 0)
pkg := new(Package)
pkg.Internal.Local = true
pkg.Internal.CmdlineFiles = true
pkg.load(ctx, opts, "command-line-arguments", &stk, nil, bp, err)
if !cfg.ModulesEnabled {
pkg.Internal.LocalPrefix = dirToImportPath(dir)
}
pkg.ImportPath = "command-line-arguments"
pkg.Target = ""
pkg.Match = gofiles
if pkg.Name == "main" {
exe := pkg.DefaultExecName() + cfg.ExeSuffix
if cfg.GOBIN != "" {
pkg.Target = filepath.Join(cfg.GOBIN, exe)
} else if cfg.ModulesEnabled {
pkg.Target = filepath.Join(modload.BinDir(), exe)
}
}
if opts.MainOnly && pkg.Name != "main" && pkg.Error == nil {
pkg.Error = &PackageError{Err: &mainPackageError{importPath: pkg.ImportPath}}
}
setToolFlags(pkg)
return pkg
}
// PackagesAndErrorsOutsideModule is like PackagesAndErrors but runs in
// module-aware mode and ignores the go.mod file in the current directory or any
// parent directory, if there is one. This is used in the implementation of 'go
// install pkg@version' and other commands that support similar forms.
//
// modload.ForceUseModules must be true, and modload.RootMode must be NoRoot
// before calling this function.
//
// PackagesAndErrorsOutsideModule imposes several constraints to avoid
// ambiguity. All arguments must have the same version suffix (not just a suffix
// that resolves to the same version). They must refer to packages in the same
// module, which must not be std or cmd. That module is not considered the main
// module, but its go.mod file (if it has one) must not contain directives that
// would cause it to be interpreted differently if it were the main module
// (replace, exclude).
func PackagesAndErrorsOutsideModule(ctx context.Context, opts PackageOpts, args []string) ([]*Package, error) {
if !modload.ForceUseModules {
panic("modload.ForceUseModules must be true")
}
if modload.RootMode != modload.NoRoot {
panic("modload.RootMode must be NoRoot")
}
// Check that the arguments satisfy syntactic constraints.
var version string
for _, arg := range args {
if i := strings.Index(arg, "@"); i >= 0 {
version = arg[i+1:]
if version == "" {
return nil, fmt.Errorf("%s: version must not be empty", arg)
}
break
}
}
patterns := make([]string, len(args))
for i, arg := range args {
if !strings.HasSuffix(arg, "@"+version) {
return nil, fmt.Errorf("%s: all arguments must refer to packages in the same module at the same version (@%s)", arg, version)
}
p := arg[:len(arg)-len(version)-1]
switch {
case build.IsLocalImport(p):
return nil, fmt.Errorf("%s: argument must be a package path, not a relative path", arg)
case filepath.IsAbs(p):
return nil, fmt.Errorf("%s: argument must be a package path, not an absolute path", arg)
case search.IsMetaPackage(p):
return nil, fmt.Errorf("%s: argument must be a package path, not a meta-package", arg)
case path.Clean(p) != p:
return nil, fmt.Errorf("%s: argument must be a clean package path", arg)
case !strings.Contains(p, "...") && search.IsStandardImportPath(p) && modindex.IsStandardPackage(cfg.GOROOT, cfg.BuildContext.Compiler, p):
return nil, fmt.Errorf("%s: argument must not be a package in the standard library", arg)
default:
patterns[i] = p
}
}
// Query the module providing the first argument, load its go.mod file, and
// check that it doesn't contain directives that would cause it to be
// interpreted differently if it were the main module.
//
// If multiple modules match the first argument, accept the longest match
// (first result). It's possible this module won't provide packages named by
// later arguments, and other modules would. Let's not try to be too
// magical though.
allowed := modload.CheckAllowed
if modload.IsRevisionQuery(version) {
// Don't check for retractions if a specific revision is requested.
allowed = nil
}
noneSelected := func(path string) (version string) { return "none" }
qrs, err := modload.QueryPackages(ctx, patterns[0], version, noneSelected, allowed)
if err != nil {
return nil, fmt.Errorf("%s: %w", args[0], err)
}
rootMod := qrs[0].Mod
data, err := modfetch.GoMod(rootMod.Path, rootMod.Version)
if err != nil {
return nil, fmt.Errorf("%s: %w", args[0], err)
}
f, err := modfile.Parse("go.mod", data, nil)
if err != nil {
return nil, fmt.Errorf("%s (in %s): %w", args[0], rootMod, err)
}
directiveFmt := "%s (in %s):\n" +
"\tThe go.mod file for the module providing named packages contains one or\n" +
"\tmore %s directives. It must not contain directives that would cause\n" +
"\tit to be interpreted differently than if it were the main module."
if len(f.Replace) > 0 {
return nil, fmt.Errorf(directiveFmt, args[0], rootMod, "replace")
}
if len(f.Exclude) > 0 {
return nil, fmt.Errorf(directiveFmt, args[0], rootMod, "exclude")
}
// Since we are in NoRoot mode, the build list initially contains only
// the dummy command-line-arguments module. Add a requirement on the
// module that provides the packages named on the command line.
if _, err := modload.EditBuildList(ctx, nil, []module.Version{rootMod}); err != nil {
return nil, fmt.Errorf("%s: %w", args[0], err)
}
// Load packages for all arguments.
pkgs := PackagesAndErrors(ctx, opts, patterns)
// Check that named packages are all provided by the same module.
for _, pkg := range pkgs {
var pkgErr error
if pkg.Module == nil {
// Packages in std, cmd, and their vendored dependencies
// don't have this field set.
pkgErr = fmt.Errorf("package %s not provided by module %s", pkg.ImportPath, rootMod)
} else if pkg.Module.Path != rootMod.Path || pkg.Module.Version != rootMod.Version {
pkgErr = fmt.Errorf("package %s provided by module %s@%s\n\tAll packages must be provided by the same module (%s).", pkg.ImportPath, pkg.Module.Path, pkg.Module.Version, rootMod)
}
if pkgErr != nil && pkg.Error == nil {
pkg.Error = &PackageError{Err: pkgErr}
}
}
matchers := make([]func(string) bool, len(patterns))
for i, p := range patterns {
if strings.Contains(p, "...") {
matchers[i] = search.MatchPattern(p)
}
}
return pkgs, nil
}
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