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embed: guarantee the returned file of FS.Open implements io.Seeker

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Fixes golang/go#45745

Change-Id: Ib49a9605a38074f544a5d28116862e191cea8c0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/313352
Run-TryBot: Hajime Hoshi <hajimehoshi@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Than McIntosh <thanm@google.com>
This commit is contained in:
Hajime Hoshi 2021-04-26 22:32:21 +09:00
parent c69f5c0d76
commit 90c5660616
1 changed files with 6 additions and 0 deletions
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6
src/embed/embed.go
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@ -291,6 +291,8 @@ func (f FS) readDir(dir string) []file {
} }
// Open opens the named file for reading and returns it as an fs.File. // Open opens the named file for reading and returns it as an fs.File.
//
// The returned file implements io.Seeker when the file is not a directory.
func (f FS) Open(name string) (fs.File, error) { func (f FS) Open(name string) (fs.File, error) {
file := f.lookup(name) file := f.lookup(name)
if file == nil { if file == nil {
@ -338,6 +340,10 @@ type openFile struct {
offset int64 // current read offset offset int64 // current read offset
} }
var (
_ io.Seeker = (*openFile)(nil)
)
func (f *openFile) Close() error { return nil } func (f *openFile) Close() error { return nil }
func (f *openFile) Stat() (fs.FileInfo, error) { return f.f, nil } func (f *openFile) Stat() (fs.FileInfo, error) { return f.f, nil }