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image: Handle systems that don't support O_PATH when updating timestamp 

Older kernel can't handle O_PATH in open() so this will
fail on dirs and symlinks. For dirs wa can fallback to
the normal Utimes, but for symlinks there is not much to do
but ignore their timestamps.
This commit is contained in:
Alexander Larsson 2013-09-19 14:57:22 +02:00 committed by Tianon Gravi
parent bbc72c85f7
commit 2c71710b74
1 changed files with 14 additions and 4 deletions
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10
image.go
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@ -336,12 +336,22 @@ func (image *Image) applyLayer(layer, target string) error {
O_PATH := 010000000 // Not in syscall yet
fd, err := syscall.Open(update.path, syscall.O_RDWR | O_PATH | syscall.O_NOFOLLOW, 0600)
if err == syscall.EISDIR || err == syscall.ELOOP {
// O_PATH not supported, use Utimes except on symlinks where Utimes doesn't work
if err != syscall.ELOOP {
err = syscall.Utimes(update.path, update.time)
if err != nil {
return err
}
}
} else {
if err != nil {
return err
}
syscall.Futimes(fd, update.time)
_ = syscall.Close(fd)
}
}
return nil
}