1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
21 "cmd/go/internal/fsys"
22 "cmd/go/internal/imports"
23 "cmd/go/internal/modindex"
25 "cmd/go/internal/search"
27 "cmd/go/internal/trace"
28 "cmd/internal/pkgpattern"
30 "golang.org/x/mod/module"
36 omitStd = stdFilter(iota)
40 // matchPackages is like m.MatchPackages, but uses a local variable (rather than
41 // a global) for tags, can include or exclude packages in the standard library,
42 // and is restricted to the given list of modules.
43 func matchPackages(ctx context.Context, m *search.Match, tags map[string]bool, filter stdFilter, modules []module.Version) {
44 ctx, span := trace.StartSpan(ctx, "modload.matchPackages")
49 isMatch := func(string) bool { return true }
50 treeCanMatch := func(string) bool { return true }
52 isMatch = pkgpattern.MatchPattern(m.Pattern())
53 treeCanMatch = pkgpattern.TreeCanMatchPattern(m.Pattern())
57 have := map[string]bool{
58 "builtin": true, // ignore pseudo-package that exists only for documentation
60 addPkg := func(p string) {
62 m.Pkgs = append(m.Pkgs, p)
65 if !cfg.BuildContext.CgoEnabled {
66 have["runtime/cgo"] = true // ignore during walk
71 pruneVendor = pruning(1 << iota)
75 q := par.NewQueue(runtime.GOMAXPROCS(0))
77 walkPkgs := func(root, importPathRoot string, prune pruning) {
78 _, span := trace.StartSpan(ctx, "walkPkgs "+root)
81 // If the root itself is a symlink to a directory,
82 // we want to follow it (see https://go.dev/issue/50807).
83 // Add a trailing separator to force that to happen.
84 root = str.WithFilePathSeparator(filepath.Clean(root))
85 err := fsys.Walk(root, func(pkgDir string, fi fs.FileInfo, err error) error {
94 // Don't use GOROOT/src but do walk down into it.
96 if importPathRoot == "" {
100 // Avoid .foo, _foo, and testdata subdirectory trees.
101 _, elem = filepath.Split(pkgDir)
102 if strings.HasPrefix(elem, ".") || strings.HasPrefix(elem, "_") || elem == "testdata" {
107 name := path.Join(importPathRoot, filepath.ToSlash(pkgDir[len(root):]))
108 if !treeCanMatch(name) {
113 if fi.Mode()&fs.ModeSymlink != 0 && want && strings.Contains(m.Pattern(), "...") {
114 if target, err := fsys.Stat(pkgDir); err == nil && target.IsDir() {
115 fmt.Fprintf(os.Stderr, "warning: ignoring symlink %s\n", pkgDir)
122 return filepath.SkipDir
124 // Stop at module boundaries.
125 if (prune&pruneGoMod != 0) && pkgDir != root {
126 if fi, err := os.Stat(filepath.Join(pkgDir, "go.mod")); err == nil && !fi.IsDir() {
127 return filepath.SkipDir
135 if _, _, err := scanDir(root, pkgDir, tags); err != imports.ErrNoGo {
142 if elem == "vendor" && (prune&pruneVendor != 0) {
143 return filepath.SkipDir
152 // Wait for all in-flight operations to complete before returning.
155 sort.Strings(m.Pkgs) // sort everything we added for determinism
158 if filter == includeStd {
159 walkPkgs(cfg.GOROOTsrc, "", pruneGoMod)
160 if treeCanMatch("cmd") {
161 walkPkgs(filepath.Join(cfg.GOROOTsrc, "cmd"), "cmd", pruneGoMod)
165 if cfg.BuildMod == "vendor" {
166 mod := MainModules.mustGetSingleMainModule()
167 if modRoot := MainModules.ModRoot(mod); modRoot != "" {
168 walkPkgs(modRoot, MainModules.PathPrefix(mod), pruneGoMod|pruneVendor)
169 walkPkgs(filepath.Join(modRoot, "vendor"), "", pruneVendor)
174 for _, mod := range modules {
175 if !treeCanMatch(mod.Path) {
180 root, modPrefix string
183 if MainModules.Contains(mod.Path) {
184 if MainModules.ModRoot(mod) == "" {
185 continue // If there is no main module, we can't search in it.
187 root = MainModules.ModRoot(mod)
188 modPrefix = MainModules.PathPrefix(mod)
192 root, isLocal, err = fetch(ctx, mod)
199 if mi, err := modindex.GetModule(root); err == nil {
200 walkFromIndex(mi, modPrefix, isMatch, treeCanMatch, tags, have, addPkg)
202 } else if !errors.Is(err, modindex.ErrNotIndexed) {
210 walkPkgs(root, modPrefix, prune)
216 // walkFromIndex matches packages in a module using the module index. modroot
217 // is the module's root directory on disk, index is the modindex.Module for the
218 // module, and importPathRoot is the module's path prefix.
219 func walkFromIndex(index *modindex.Module, importPathRoot string, isMatch, treeCanMatch func(string) bool, tags, have map[string]bool, addPkg func(string)) {
220 index.Walk(func(reldir string) {
221 // Avoid .foo, _foo, and testdata subdirectory trees.
224 elem, rest, found := strings.Cut(p, string(filepath.Separator))
225 if strings.HasPrefix(elem, ".") || strings.HasPrefix(elem, "_") || elem == "testdata" {
228 if found && elem == "vendor" {
229 // Ignore this path if it contains the element "vendor" anywhere
230 // except for the last element (packages named vendor are allowed
231 // for historical reasons). Note that found is true when this
232 // isn't the last path element.
236 // Didn't find the separator, so we're considering the last element.
242 // Don't use GOROOT/src.
243 if reldir == "" && importPathRoot == "" {
247 name := path.Join(importPathRoot, filepath.ToSlash(reldir))
248 if !treeCanMatch(name) {
255 if _, _, err := index.Package(reldir).ScanDir(tags); err != imports.ErrNoGo {
263 // MatchInModule identifies the packages matching the given pattern within the
264 // given module version, which does not need to be in the build list or module
265 // requirement graph.
267 // If m is the zero module.Version, MatchInModule matches the pattern
268 // against the standard library (std and cmd) in GOROOT/src.
269 func MatchInModule(ctx context.Context, pattern string, m module.Version, tags map[string]bool) *search.Match {
270 match := search.NewMatch(pattern)
271 if m == (module.Version{}) {
272 matchPackages(ctx, match, tags, includeStd, nil)
275 LoadModFile(ctx) // Sets Target, needed by fetch and matchPackages.
277 if !match.IsLiteral() {
278 matchPackages(ctx, match, tags, omitStd, []module.Version{m})
282 root, isLocal, err := fetch(ctx, m)
284 match.Errs = []error{err}
288 dir, haveGoFiles, err := dirInModule(pattern, m.Path, root, isLocal)
290 match.Errs = []error{err}
294 if _, _, err := scanDir(root, dir, tags); err != imports.ErrNoGo {
295 // ErrNoGo indicates that the directory is not actually a Go package,
296 // perhaps due to the tags in use. Any other non-nil error indicates a
297 // problem with one or more of the Go source files, but such an error does
298 // not stop the package from existing, so it has no impact on matching.
299 match.Pkgs = []string{pattern}