osbuild/tar: allow numeric owner

In a recent osbuild PR [1] an option was added to allow using numeric
owners in tar archives. This is wanted because including user and group
names in metadata can lead to unwanted side-effects when unpacking on a
system that contains user/group names.

Allow the tar stage to set this option in `images` as well.

Signed-off-by: Simon de Vlieger <[email protected]>

Author: supakeen

pkg/osbuild/tar_stage.go

@@ -60,6 +60,11 @@ type TarStageOptions struct {
 
 	// Pass --transform=...
 	Transform string `json:"transform,omitempty"`
+
+	// Pass `--numeric-owner` which omits user and group names in metadata
+	// We often want this since name/group mapping can change the ownership
+	// of files during extraction.
+	NumericOwner *bool `json:"numeric-owner,omitempty"`
 }
 
 func (TarStageOptions) isStageOptions() {}