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archive: fix logic for skipping mknod when running in userns

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Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2018-02-28 03:01:02 +09:00
parent 25c403415a
commit fffc111ba8
1 changed files with 13 additions and 10 deletions
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23
archive/tar_unix.go
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@ -87,10 +87,6 @@ func mkdir(path string, perm os.FileMode) error {
return os.Chmod(path, perm)
}
func skipFile(*tar.Header) bool {
return false
}
var (
inUserNS bool
nsOnce sync.Once
@ -100,15 +96,22 @@ func setInUserNS() {
inUserNS = system.RunningInUserNS()
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
nsOnce.Do(setInUserNS)
if inUserNS {
func skipFile(hdr *tar.Header) bool {
switch hdr.Typeflag {
case tar.TypeBlock, tar.TypeChar:
// cannot create a device if running in user namespace
return nil
nsOnce.Do(setInUserNS)
return inUserNS
default:
return false
}
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo.
// This function must not be called for Block and Char when running in userns.
// (skipFile() should return true for them.)
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
mode := uint32(hdr.Mode & 07777)
switch hdr.Typeflag {
case tar.TypeBlock: