From 10a1a1a37c007adef8425d273e6b276547982889 Mon Sep 17 00:00:00 2001 From: Russ Cox Date: Mon, 6 Jul 2020 11:26:45 -0400 Subject: io/fs: add Stat and StatFS Add Stat helper function, StatFS interface, and test. Add Stat method to fstest.MapFS. Add testing of Stat method to fstest.TestFS. For #41190. Change-Id: Icf8b6eb1c3fa6f93a9be8405ec5a9468fb1da97b Reviewed-on: https://go-review.googlesource.com/c/go/+/243913 Trust: Russ Cox Reviewed-by: Rob Pike --- src/io/fs/stat.go | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/io/fs/stat.go (limited to 'src/io/fs/stat.go') diff --git a/src/io/fs/stat.go b/src/io/fs/stat.go new file mode 100644 index 0000000000..735a6e3281 --- /dev/null +++ b/src/io/fs/stat.go @@ -0,0 +1,31 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package fs + +// A StatFS is a file system with a Stat method. +type StatFS interface { + FS + + // Stat returns a FileInfo describing the file. + // If there is an error, it should be of type *PathError. + Stat(name string) (FileInfo, error) +} + +// Stat returns a FileInfo describing the named file from the file system. +// +// If fs implements StatFS, Stat calls fs.Stat. +// Otherwise, Stat opens the file to stat it. +func Stat(fsys FS, name string) (FileInfo, error) { + if fsys, ok := fsys.(StatFS); ok { + return fsys.Stat(name) + } + + file, err := fsys.Open(name) + if err != nil { + return nil, err + } + defer file.Close() + return file.Stat() +} -- cgit v1.2.1