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walker.go
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walker.go
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package fsutil
import (
"context"
"os"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/docker/docker/pkg/fileutils"
"github.com/dovejb/fsutil/types"
"github.com/pkg/errors"
)
type WalkOpt struct {
IncludePatterns []string
ExcludePatterns []string
// FollowPaths contains symlinks that are resolved into include patterns
// before performing the fs walk
FollowPaths []string
Map FilterFunc
}
func Walk(ctx context.Context, p string, opt *WalkOpt, fn filepath.WalkFunc) error {
root, err := filepath.EvalSymlinks(p)
if err != nil {
return errors.WithStack(&os.PathError{Op: "resolve", Path: root, Err: err})
}
fi, err := os.Stat(root)
if err != nil {
return errors.WithStack(err)
}
if !fi.IsDir() {
return errors.WithStack(&os.PathError{Op: "walk", Path: root, Err: syscall.ENOTDIR})
}
var (
includePatterns []string
includeMatcher *fileutils.PatternMatcher
excludeMatcher *fileutils.PatternMatcher
)
if opt != nil && opt.IncludePatterns != nil {
includePatterns = make([]string, len(opt.IncludePatterns))
copy(includePatterns, opt.IncludePatterns)
}
if opt != nil && opt.FollowPaths != nil {
targets, err := FollowLinks(p, opt.FollowPaths)
if err != nil {
return err
}
if targets != nil {
includePatterns = append(includePatterns, targets...)
includePatterns = dedupePaths(includePatterns)
}
}
patternChars := "*[]?^"
if os.PathSeparator != '\\' {
patternChars += `\`
}
onlyPrefixIncludes := true
if len(includePatterns) != 0 {
includeMatcher, err = fileutils.NewPatternMatcher(includePatterns)
if err != nil {
return errors.Wrapf(err, "invalid includepatterns: %s", opt.IncludePatterns)
}
for _, p := range includeMatcher.Patterns() {
if !p.Exclusion() && strings.ContainsAny(patternWithoutTrailingGlob(p), patternChars) {
onlyPrefixIncludes = false
break
}
}
}
onlyPrefixExcludeExceptions := true
if opt != nil && opt.ExcludePatterns != nil {
excludeMatcher, err = fileutils.NewPatternMatcher(opt.ExcludePatterns)
if err != nil {
return errors.Wrapf(err, "invalid excludepatterns: %s", opt.ExcludePatterns)
}
for _, p := range excludeMatcher.Patterns() {
if p.Exclusion() && strings.ContainsAny(patternWithoutTrailingGlob(p), patternChars) {
onlyPrefixExcludeExceptions = false
break
}
}
}
type visitedDir struct {
fi os.FileInfo
path string
origpath string
pathWithSep string
includeMatchInfo fileutils.MatchInfo
excludeMatchInfo fileutils.MatchInfo
calledFn bool
}
// used only for include/exclude handling
var parentDirs []visitedDir
seenFiles := make(map[uint64]string)
return filepath.Walk(root, func(path string, fi os.FileInfo, walkErr error) (retErr error) {
defer func() {
if retErr != nil && isNotExist(retErr) {
retErr = filepath.SkipDir
}
}()
origpath := path
path, err = filepath.Rel(root, path)
if err != nil {
return err
}
// Skip root
if path == "." {
return nil
}
var dir visitedDir
if includeMatcher != nil || excludeMatcher != nil {
for len(parentDirs) != 0 {
lastParentDir := parentDirs[len(parentDirs)-1].pathWithSep
if strings.HasPrefix(path, lastParentDir) {
break
}
parentDirs = parentDirs[:len(parentDirs)-1]
}
if fi.IsDir() {
dir = visitedDir{
fi: fi,
path: path,
origpath: origpath,
pathWithSep: path + string(filepath.Separator),
}
}
}
skip := false
if includeMatcher != nil {
var parentIncludeMatchInfo fileutils.MatchInfo
if len(parentDirs) != 0 {
parentIncludeMatchInfo = parentDirs[len(parentDirs)-1].includeMatchInfo
}
m, matchInfo, err := includeMatcher.MatchesUsingParentResults(path, parentIncludeMatchInfo)
if err != nil {
return errors.Wrap(err, "failed to match includepatterns")
}
if fi.IsDir() {
dir.includeMatchInfo = matchInfo
}
if !m {
if fi.IsDir() && onlyPrefixIncludes {
// Optimization: we can skip walking this dir if no include
// patterns could match anything inside it.
dirSlash := path + string(filepath.Separator)
for _, pat := range includeMatcher.Patterns() {
if pat.Exclusion() {
continue
}
patStr := patternWithoutTrailingGlob(pat) + string(filepath.Separator)
if strings.HasPrefix(patStr, dirSlash) {
goto passedIncludeFilter
}
}
return filepath.SkipDir
}
passedIncludeFilter:
skip = true
}
}
if excludeMatcher != nil {
var parentExcludeMatchInfo fileutils.MatchInfo
if len(parentDirs) != 0 {
parentExcludeMatchInfo = parentDirs[len(parentDirs)-1].excludeMatchInfo
}
m, matchInfo, err := excludeMatcher.MatchesUsingParentResults(path, parentExcludeMatchInfo)
if err != nil {
return errors.Wrap(err, "failed to match excludepatterns")
}
if fi.IsDir() {
dir.excludeMatchInfo = matchInfo
}
if m {
if fi.IsDir() && onlyPrefixExcludeExceptions {
// Optimization: we can skip walking this dir if no
// exceptions to exclude patterns could match anything
// inside it.
if !excludeMatcher.Exclusions() {
return filepath.SkipDir
}
dirSlash := path + string(filepath.Separator)
for _, pat := range excludeMatcher.Patterns() {
if !pat.Exclusion() {
continue
}
patStr := patternWithoutTrailingGlob(pat) + string(filepath.Separator)
if strings.HasPrefix(patStr, dirSlash) {
goto passedExcludeFilter
}
}
return filepath.SkipDir
}
passedExcludeFilter:
skip = true
}
}
if walkErr != nil {
if skip && errors.Is(walkErr, os.ErrPermission) {
return nil
}
return walkErr
}
if includeMatcher != nil || excludeMatcher != nil {
defer func() {
if fi.IsDir() {
parentDirs = append(parentDirs, dir)
}
}()
}
if skip {
return nil
}
dir.calledFn = true
stat, err := mkstat(origpath, path, fi, seenFiles)
if err != nil {
return err
}
select {
case <-ctx.Done():
return ctx.Err()
default:
if opt != nil && opt.Map != nil {
if allowed := opt.Map(stat.Path, stat); !allowed {
return nil
}
}
for i, parentDir := range parentDirs {
if parentDir.calledFn {
continue
}
parentStat, err := mkstat(parentDir.origpath, parentDir.path, parentDir.fi, seenFiles)
if err != nil {
return err
}
select {
case <-ctx.Done():
return ctx.Err()
default:
}
if opt != nil && opt.Map != nil {
if allowed := opt.Map(parentStat.Path, parentStat); !allowed {
continue
}
}
if err := fn(parentStat.Path, &StatInfo{parentStat}, nil); err != nil {
return err
}
parentDirs[i].calledFn = true
}
if err := fn(stat.Path, &StatInfo{stat}, nil); err != nil {
return err
}
}
return nil
})
}
func patternWithoutTrailingGlob(p *fileutils.Pattern) string {
patStr := p.String()
// We use filepath.Separator here because fileutils.Pattern patterns
// get transformed to use the native path separator:
// https://github.com/moby/moby/blob/79651b7a979b40e26af353ad283ca7ea5d67a855/pkg/fileutils/fileutils.go#L54
patStr = strings.TrimSuffix(patStr, string(filepath.Separator)+"**")
patStr = strings.TrimSuffix(patStr, string(filepath.Separator)+"*")
return patStr
}
type StatInfo struct {
*types.Stat
}
func (s *StatInfo) Name() string {
return filepath.Base(s.Stat.Path)
}
func (s *StatInfo) Size() int64 {
return s.Stat.Size_
}
func (s *StatInfo) Mode() os.FileMode {
return os.FileMode(s.Stat.Mode)
}
func (s *StatInfo) ModTime() time.Time {
return time.Unix(s.Stat.ModTime/1e9, s.Stat.ModTime%1e9)
}
func (s *StatInfo) IsDir() bool {
return s.Mode().IsDir()
}
func (s *StatInfo) Sys() interface{} {
return s.Stat
}
func isNotExist(err error) bool {
return errors.Is(err, os.ErrNotExist) || errors.Is(err, syscall.ENOTDIR)
}