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io/ioutil: provide an equivalent for the deprecated ReadDir

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All APIs in the now-deprecated io/ioutil package have a direct
replacement in either the io or os package with the same signature,
with the notable exception of ioutil.ReadDir, as os.ReadDir has a
slightly different signature with fs.DirEntry rather than fs.FileInfo.

New code can easily make use of []fs.DirEntry directly,
but existing code may need to continue using []fs.FileInfo for backwards
compatibility reasons. For instance, I had a bit of code that exposed
the slice as a public API, like:

	return ioutil.ReadDir(name)

It took me a couple of minutes to figure out what the exact equivalent
in terms of os.ReadDir would be, and a code sample would have helped.
Add one for future reference.

For #42026.
For #51927.

Change-Id: I76d46cd7d68fc609c873821755fdcfc299ffd56c
Reviewed-on: https://go-review.googlesource.com/c/go/+/399854
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Daniel Martí 2022-04-12 07:11:28 +01:00 committed by Gopher Robot
parent e25f46e596
commit e04280838f
1 changed files with 11 additions and 0 deletions
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11
src/io/ioutil/ioutil.go
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@ -55,6 +55,17 @@ func WriteFile(filename string, data []byte, perm fs.FileMode) error {
// it returns a list of fs.DirEntry instead of fs.FileInfo,
// and it returns partial results in the case of an error
// midway through reading a directory.
//
// If you must continue obtaining a list of fs.FileInfo, you still can:
//
// entries, err := os.ReadDir(dirname)
// if err != nil { ... }
// infos := make([]fs.FileInfo, 0, len(entries))
// for _, entry := range entries {
// info, err := entry.Info()
// if err != nil { ... }
// infos = append(infos, info)
// }
func ReadDir(dirname string) ([]fs.FileInfo, error) {
f, err := os.Open(dirname)
if err != nil {