mirror of https://github.com/docker/cli.git
121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
package fsutil
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import (
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"context"
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"io"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"syscall"
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"github.com/pkg/errors"
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"github.com/tonistiigi/fsutil/types"
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)
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type FS interface {
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Walk(context.Context, filepath.WalkFunc) error
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Open(string) (io.ReadCloser, error)
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}
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func NewFS(root string, opt *WalkOpt) FS {
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return &fs{
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root: root,
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opt: opt,
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}
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}
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type fs struct {
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root string
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opt *WalkOpt
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}
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func (fs *fs) Walk(ctx context.Context, fn filepath.WalkFunc) error {
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return Walk(ctx, fs.root, fs.opt, fn)
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}
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func (fs *fs) Open(p string) (io.ReadCloser, error) {
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rc, err := os.Open(filepath.Join(fs.root, p))
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return rc, errors.WithStack(err)
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}
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type Dir struct {
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Stat types.Stat
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FS FS
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}
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func SubDirFS(dirs []Dir) (FS, error) {
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sort.Slice(dirs, func(i, j int) bool {
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return dirs[i].Stat.Path < dirs[j].Stat.Path
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})
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m := map[string]Dir{}
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for _, d := range dirs {
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if path.Base(d.Stat.Path) != d.Stat.Path {
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return nil, errors.WithStack(&os.PathError{Path: d.Stat.Path, Err: syscall.EISDIR, Op: "invalid path"})
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}
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if _, ok := m[d.Stat.Path]; ok {
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return nil, errors.WithStack(&os.PathError{Path: d.Stat.Path, Err: syscall.EEXIST, Op: "duplicate path"})
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}
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m[d.Stat.Path] = d
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}
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return &subDirFS{m: m, dirs: dirs}, nil
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}
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type subDirFS struct {
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m map[string]Dir
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dirs []Dir
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}
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func (fs *subDirFS) Walk(ctx context.Context, fn filepath.WalkFunc) error {
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for _, d := range fs.dirs {
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fi := &StatInfo{Stat: &d.Stat}
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if !fi.IsDir() {
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return errors.WithStack(&os.PathError{Path: d.Stat.Path, Err: syscall.ENOTDIR, Op: "walk subdir"})
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}
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if err := fn(d.Stat.Path, fi, nil); err != nil {
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return err
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}
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if err := d.FS.Walk(ctx, func(p string, fi os.FileInfo, err error) error {
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stat, ok := fi.Sys().(*types.Stat)
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if !ok {
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return errors.WithStack(&os.PathError{Path: d.Stat.Path, Err: syscall.EBADMSG, Op: "fileinfo without stat info"})
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}
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stat.Path = path.Join(d.Stat.Path, stat.Path)
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if stat.Linkname != "" {
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if fi.Mode()&os.ModeSymlink != 0 {
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if strings.HasPrefix(stat.Linkname, "/") {
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stat.Linkname = path.Join("/"+d.Stat.Path, stat.Linkname)
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}
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} else {
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stat.Linkname = path.Join(d.Stat.Path, stat.Linkname)
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}
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}
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return fn(filepath.Join(d.Stat.Path, p), &StatInfo{stat}, nil)
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}); err != nil {
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return err
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}
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}
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return nil
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}
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func (fs *subDirFS) Open(p string) (io.ReadCloser, error) {
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parts := strings.SplitN(filepath.Clean(p), string(filepath.Separator), 2)
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if len(parts) == 0 {
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return ioutil.NopCloser(&emptyReader{}), nil
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}
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d, ok := fs.m[parts[0]]
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if !ok {
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return nil, errors.WithStack(&os.PathError{Path: parts[0], Err: syscall.ENOENT, Op: "open"})
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}
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return d.FS.Open(parts[1])
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}
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type emptyReader struct {
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}
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func (*emptyReader) Read([]byte) (int, error) {
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return 0, io.EOF
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}
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