mirror of
https://github.com/rocky-linux/peridot.git
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265 lines
7.2 KiB
Go
265 lines
7.2 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package gopathwalk is like filepath.Walk but specialized for finding Go
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// packages, particularly in $GOPATH and $GOROOT.
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package gopathwalk
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import (
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"bufio"
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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"time"
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"golang.org/x/tools/internal/fastwalk"
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)
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// Options controls the behavior of a Walk call.
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type Options struct {
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// If Logf is non-nil, debug logging is enabled through this function.
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Logf func(format string, args ...interface{})
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// Search module caches. Also disables legacy goimports ignore rules.
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ModulesEnabled bool
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}
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// RootType indicates the type of a Root.
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type RootType int
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const (
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RootUnknown RootType = iota
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RootGOROOT
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RootGOPATH
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RootCurrentModule
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RootModuleCache
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RootOther
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)
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// A Root is a starting point for a Walk.
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type Root struct {
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Path string
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Type RootType
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}
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// Walk walks Go source directories ($GOROOT, $GOPATH, etc) to find packages.
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// For each package found, add will be called (concurrently) with the absolute
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// paths of the containing source directory and the package directory.
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// add will be called concurrently.
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func Walk(roots []Root, add func(root Root, dir string), opts Options) {
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WalkSkip(roots, add, func(Root, string) bool { return false }, opts)
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}
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// WalkSkip walks Go source directories ($GOROOT, $GOPATH, etc) to find packages.
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// For each package found, add will be called (concurrently) with the absolute
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// paths of the containing source directory and the package directory.
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// For each directory that will be scanned, skip will be called (concurrently)
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// with the absolute paths of the containing source directory and the directory.
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// If skip returns false on a directory it will be processed.
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// add will be called concurrently.
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// skip will be called concurrently.
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func WalkSkip(roots []Root, add func(root Root, dir string), skip func(root Root, dir string) bool, opts Options) {
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for _, root := range roots {
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walkDir(root, add, skip, opts)
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}
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}
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// walkDir creates a walker and starts fastwalk with this walker.
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func walkDir(root Root, add func(Root, string), skip func(root Root, dir string) bool, opts Options) {
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if _, err := os.Stat(root.Path); os.IsNotExist(err) {
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if opts.Logf != nil {
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opts.Logf("skipping nonexistent directory: %v", root.Path)
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}
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return
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}
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start := time.Now()
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if opts.Logf != nil {
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opts.Logf("gopathwalk: scanning %s", root.Path)
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}
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w := &walker{
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root: root,
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add: add,
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skip: skip,
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opts: opts,
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}
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w.init()
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if err := fastwalk.Walk(root.Path, w.walk); err != nil {
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log.Printf("gopathwalk: scanning directory %v: %v", root.Path, err)
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}
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if opts.Logf != nil {
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opts.Logf("gopathwalk: scanned %s in %v", root.Path, time.Since(start))
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}
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}
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// walker is the callback for fastwalk.Walk.
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type walker struct {
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root Root // The source directory to scan.
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add func(Root, string) // The callback that will be invoked for every possible Go package dir.
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skip func(Root, string) bool // The callback that will be invoked for every dir. dir is skipped if it returns true.
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opts Options // Options passed to Walk by the user.
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ignoredDirs []os.FileInfo // The ignored directories, loaded from .goimportsignore files.
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}
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// init initializes the walker based on its Options
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func (w *walker) init() {
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var ignoredPaths []string
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if w.root.Type == RootModuleCache {
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ignoredPaths = []string{"cache"}
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}
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if !w.opts.ModulesEnabled && w.root.Type == RootGOPATH {
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ignoredPaths = w.getIgnoredDirs(w.root.Path)
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ignoredPaths = append(ignoredPaths, "v", "mod")
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}
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for _, p := range ignoredPaths {
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full := filepath.Join(w.root.Path, p)
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if fi, err := os.Stat(full); err == nil {
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w.ignoredDirs = append(w.ignoredDirs, fi)
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if w.opts.Logf != nil {
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w.opts.Logf("Directory added to ignore list: %s", full)
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}
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} else if w.opts.Logf != nil {
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w.opts.Logf("Error statting ignored directory: %v", err)
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}
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}
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}
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// getIgnoredDirs reads an optional config file at <path>/.goimportsignore
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// of relative directories to ignore when scanning for go files.
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// The provided path is one of the $GOPATH entries with "src" appended.
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func (w *walker) getIgnoredDirs(path string) []string {
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file := filepath.Join(path, ".goimportsignore")
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slurp, err := ioutil.ReadFile(file)
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if w.opts.Logf != nil {
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if err != nil {
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w.opts.Logf("%v", err)
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} else {
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w.opts.Logf("Read %s", file)
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}
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}
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if err != nil {
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return nil
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}
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var ignoredDirs []string
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bs := bufio.NewScanner(bytes.NewReader(slurp))
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for bs.Scan() {
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line := strings.TrimSpace(bs.Text())
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if line == "" || strings.HasPrefix(line, "#") {
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continue
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}
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ignoredDirs = append(ignoredDirs, line)
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}
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return ignoredDirs
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}
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// shouldSkipDir reports whether the file should be skipped or not.
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func (w *walker) shouldSkipDir(fi os.FileInfo, dir string) bool {
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for _, ignoredDir := range w.ignoredDirs {
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if os.SameFile(fi, ignoredDir) {
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return true
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}
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}
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if w.skip != nil {
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// Check with the user specified callback.
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return w.skip(w.root, dir)
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}
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return false
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}
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// walk walks through the given path.
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func (w *walker) walk(path string, typ os.FileMode) error {
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dir := filepath.Dir(path)
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if typ.IsRegular() {
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if dir == w.root.Path && (w.root.Type == RootGOROOT || w.root.Type == RootGOPATH) {
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// Doesn't make sense to have regular files
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// directly in your $GOPATH/src or $GOROOT/src.
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return fastwalk.ErrSkipFiles
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}
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if !strings.HasSuffix(path, ".go") {
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return nil
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}
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w.add(w.root, dir)
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return fastwalk.ErrSkipFiles
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}
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if typ == os.ModeDir {
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base := filepath.Base(path)
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if base == "" || base[0] == '.' || base[0] == '_' ||
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base == "testdata" ||
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(w.root.Type == RootGOROOT && w.opts.ModulesEnabled && base == "vendor") ||
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(!w.opts.ModulesEnabled && base == "node_modules") {
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return filepath.SkipDir
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}
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fi, err := os.Lstat(path)
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if err == nil && w.shouldSkipDir(fi, path) {
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return filepath.SkipDir
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}
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return nil
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}
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if typ == os.ModeSymlink {
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base := filepath.Base(path)
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if strings.HasPrefix(base, ".#") {
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// Emacs noise.
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return nil
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}
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fi, err := os.Lstat(path)
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if err != nil {
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// Just ignore it.
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return nil
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}
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if w.shouldTraverse(dir, fi) {
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return fastwalk.ErrTraverseLink
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}
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}
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return nil
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}
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// shouldTraverse reports whether the symlink fi, found in dir,
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// should be followed. It makes sure symlinks were never visited
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// before to avoid symlink loops.
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func (w *walker) shouldTraverse(dir string, fi os.FileInfo) bool {
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path := filepath.Join(dir, fi.Name())
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target, err := filepath.EvalSymlinks(path)
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if err != nil {
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return false
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}
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ts, err := os.Stat(target)
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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return false
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}
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if !ts.IsDir() {
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return false
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}
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if w.shouldSkipDir(ts, dir) {
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return false
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}
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// Check for symlink loops by statting each directory component
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// and seeing if any are the same file as ts.
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for {
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parent := filepath.Dir(path)
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if parent == path {
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// Made it to the root without seeing a cycle.
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// Use this symlink.
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return true
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}
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parentInfo, err := os.Stat(parent)
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if err != nil {
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return false
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}
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if os.SameFile(ts, parentInfo) {
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// Cycle. Don't traverse.
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return false
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}
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path = parent
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}
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}
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