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os: add implementation of fs.ReadLinkFS to *rootFS

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Fixes #73887

Change-Id: I43f3f4324d740b5381615bce864b7ec31415a635
Reviewed-on: https://go-review.googlesource.com/c/go/+/676135
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Roxy Light 2025-05-24 16:07:58 -07:00 • committed by Damien Neil
parent 78e86297f5
commit 29782bd347
1 changed files with 18 additions and 2 deletions
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20
src/os/root.go
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@ -352,8 +352,8 @@ func splitPathInRoot(s string, prefix, suffix []string) (_ []string, suffixSep s
// FS returns a file system (an fs.FS) for the tree of files in the root.
//
// The result implements [io/fs.StatFS], [io/fs.ReadFileFS] and
// [io/fs.ReadDirFS].
// The result implements [io/fs.StatFS], [io/fs.ReadFileFS],
// [io/fs.ReadDirFS], and [io/fs.ReadLinkFS].
func (r *Root) FS() fs.FS {
return (*rootFS)(r)
}
@ -409,6 +409,14 @@ func (rfs *rootFS) ReadFile(name string) ([]byte, error) {
return readFileContents(statOrZero(f), f.Read)
}
func (rfs *rootFS) ReadLink(name string) (string, error) {
r := (*Root)(rfs)
if !isValidRootFSPath(name) {
return "", &PathError{Op: "readlink", Path: name, Err: ErrInvalid}
}
return r.Readlink(name)
}
func (rfs *rootFS) Stat(name string) (FileInfo, error) {
r := (*Root)(rfs)
if !isValidRootFSPath(name) {
@ -417,6 +425,14 @@ func (rfs *rootFS) Stat(name string) (FileInfo, error) {
return r.Stat(name)
}
func (rfs *rootFS) Lstat(name string) (FileInfo, error) {
r := (*Root)(rfs)
if !isValidRootFSPath(name) {
return nil, &PathError{Op: "lstat", Path: name, Err: ErrInvalid}
}
return r.Lstat(name)
}
// isValidRootFSPath reports whether name is a valid filename to pass a Root.FS method.
func isValidRootFSPath(name string) bool {
if !fs.ValidPath(name) {