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io/ioutil: update WriteFile to clarify it does not change permissions if the file exists.

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The existing documentation of WriteFile does not make it clear for
non-native English speakers that it will not change the permissions if
the file already exists before.

Fixes #35711

Change-Id: If861c3e3700957fc9ac3d5313351c57d399d3f58
Reviewed-on: https://go-review.googlesource.com/c/go/+/218417
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
joshuabezaleel 2020-02-07 17:36:26 +07:00 committed by Rob Pike
parent bffb8818e7
commit b371f189df
1 changed files with 1 additions and 1 deletions
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2
src/io/ioutil/ioutil.go
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@ -75,7 +75,7 @@ func ReadFile(filename string) ([]byte, error) {
// WriteFile writes data to a file named by filename.
// If the file does not exist, WriteFile creates it with permissions perm
// (before umask); otherwise WriteFile truncates it before writing.
// (before umask); otherwise WriteFile truncates it before writing, without changing permissions.
func WriteFile(filename string, data []byte, perm os.FileMode) error {
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
if err != nil {