allow xattr error

This commit allows ignoring errors during copying xattr like security.selinux,
which is not always supported.

Reported in several issues including
* openfaas/openfaas-cloud#312
* moby/buildkit#704
* genuinetools/img#45
* https://bugzilla.redhat.com/show_bug.cgi?id=1596918

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

cmd/copy/main.go

@@ -134,10 +134,15 @@ func runCopy(ctx context.Context, args []string, opt opts) error {
 }
 
 func runCp(ctx context.Context, srcs []string, dest string, opt opts) error {
+	xattrErrorHandler := func(dst, src, key string, err error) error {
+		log.Println(err)
+		return nil
+	}
 	for _, src := range srcs {
-		if err := copy.Copy(ctx, src, dest, copy.AllowWildcards, func(ci *copy.CopyInfo) {
-			ci.Chown = opt.chown
-		}); err != nil {
+		if err := copy.Copy(ctx, src, dest, copy.AllowWildcards, copy.WithXAttrErrorHandler(xattrErrorHandler),
+			func(ci *copy.CopyInfo) {
+				ci.Chown = opt.chown
+			}); err != nil {
 			return errors.Wrapf(err, "failed to copy %s to %s", src, dest)
 		}
 	}

vendor.conf

@@ -1,5 +1,5 @@
 github.com/moby/buildkit 277037a77f32b689df342c2ac7ea1c093be4b52e
-github.com/tonistiigi/fsutil ecf259bc9d815143037535521910285f47f321ef
+github.com/tonistiigi/fsutil 11b4bc7505e4558833cf30344d84e225766b21c1
 github.com/containerd/continuity c6cef34830231743494fe2969284df7b82cc0ad0
 github.com/pkg/errors e881fd58d78e04cf6d0de1217f8707c8cc2249bc
 github.com/containerd/containerd 1a560540b9a1ab7dcdf657502b2f4db0ae067b30