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refactor/rename: preserve file modes.

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Fixes golang/go#9013

LGTM=sameer
R=sameer, minux
CC=golang-codereviews
https://golang.org/cl/185000043
This commit is contained in:
Alan Donovan 2014-12-05 14:07:01 -05:00
parent 25f58f97ce
commit a28cb655e6
1 changed files with 15 additions and 3 deletions
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18
refactor/rename/rename.go
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@ -319,16 +319,23 @@ func plural(n int) string {
return ""
}
func writeFile(name string, fset *token.FileSet, f *ast.File) error {
out, err := os.Create(name)
func writeFile(name string, fset *token.FileSet, f *ast.File, mode os.FileMode) error {
out, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
// assume error includes the filename
return fmt.Errorf("failed to open file: %s", err)
}
// Oddly, os.OpenFile doesn't preserve all the mode bits, hence
// this chmod. (We use 0600 above to avoid a brief
// vulnerability if the user has an insecure umask.)
os.Chmod(name, mode) // ignore error
if err := format.Node(out, fset, f); err != nil {
out.Close() // ignore error
return fmt.Errorf("failed to write file: %s", err)
}
return out.Close()
}
@ -339,11 +346,16 @@ var rewriteFile = func(fset *token.FileSet, f *ast.File, orig string) (err error
if Verbose {
fmt.Fprintf(os.Stderr, "\t%s\n", orig)
}
// save file mode
var mode os.FileMode = 0666
if fi, err := os.Stat(orig); err == nil {
mode = fi.Mode()
}
if err := os.Rename(orig, backup); err != nil {
return fmt.Errorf("failed to make backup %s -> %s: %s",
orig, filepath.Base(backup), err)
}
if err := writeFile(orig, fset, f); err != nil {
if err := writeFile(orig, fset, f, mode); err != nil {
// Restore the file from the backup.
os.Remove(orig) // ignore error
os.Rename(backup, orig) // ignore error