1 files changed, 42 insertions, 0 deletions

diff --git a/cli/internal/tarpatch/tar_unix.go b/cli/internal/tarpatch/tar_unix.go
new file mode 100644
index 0000000..3020c0e
--- /dev/null
+++ b/cli/internal/tarpatch/tar_unix.go
@@ -0,0 +1,42 @@
+//go:build !windows
+// +build !windows
+
+// Adapted from https://github.com/moby/moby/blob/924edb948c2731df3b77697a8fcc85da3f6eef57/pkg/archive/archive_unix.go
+// Copyright Docker, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+package tarpatch
+
+import (
+	"archive/tar"
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+// chmodTarEntry is used to adjust the file permissions used in tar header based
+// on the platform the archival is done.
+func chmodTarEntry(perm os.FileMode) os.FileMode {
+	return perm // noop for unix as golang APIs provide perm bits correctly
+}
+
+// sysStat populates hdr from system-dependent fields of fi without performing
+// any OS lookups.
+func sysStat(fi os.FileInfo, hdr *tar.Header) error {
+	s, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return nil
+	}
+
+	hdr.Uid = int(s.Uid)
+	hdr.Gid = int(s.Gid)
+
+	if s.Mode&unix.S_IFBLK != 0 ||
+		s.Mode&unix.S_IFCHR != 0 {
+		hdr.Devmajor = int64(unix.Major(uint64(s.Rdev))) //nolint: unconvert
+		hdr.Devminor = int64(unix.Minor(uint64(s.Rdev))) //nolint: unconvert
+	}
+
+	return nil
+}