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Image: Fix time setting for old kernels

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This is a better fix for futimes() on kernels not supporting O_PATH.
The previous fix broke when copying a device, as it tried to open it
and got and error.
This commit is contained in:
Alexander Larsson 2013-09-26 21:12:12 +02:00 • committed by Tianon Gravi
parent 152302e379
commit 55e1782d66
1 changed files with 15 additions and 10 deletions
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25
image.go
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@ -151,6 +151,7 @@ func (image *Image) TarLayer(compression Compression) (Archive, error) {
type TimeUpdate struct {
path string
time []syscall.Timeval
mode uint32
}
func (image *Image) applyLayer(layer, target string) error {
@ -291,6 +292,7 @@ func (image *Image) applyLayer(layer, target string) error {
u := TimeUpdate{
path: targetPath,
time: ts,
mode: srcStat.Mode,
}
// Delay time updates until all other changes done, or it is
@ -308,21 +310,24 @@ func (image *Image) applyLayer(layer, target string) error {
update := updateTimes[i]
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
}
var err error = nil
if update.mode&syscall.S_IFLNK == syscall.S_IFLNK {
// Update time on the symlink via O_PATH + futimes(), if supported by the kernel
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 by kernel, nothing to do, ignore
} else if err != nil {
return err
} else {
syscall.Futimes(fd, update.time)
_ = syscall.Close(fd)
}
} else {
err = syscall.Utimes(update.path, update.time)
if err != nil {
return err
}
syscall.Futimes(fd, update.time)
_ = syscall.Close(fd)
}
}