Merge pull request #11195 from Luap99/xdg-root

rootful: unset XDG_RUNTIME_DIR

cmd/podman/registry/config.go

@@ -89,7 +89,12 @@ func newPodmanConfig() {
 // use for the containers.conf configuration file.
 func setXdgDirs() error {
 	if !rootless.IsRootless() {
-		return nil
+		// unset XDG_RUNTIME_DIR for root
+		// Sometimes XDG_RUNTIME_DIR is set to /run/user/0 sometimes it is unset,
+		// the inconsistency is causing issues for the dnsname plugin.
+		// It is already set to an empty string for conmon so lets do the same
+		// for podman. see #10806 and #10745
+		return os.Unsetenv("XDG_RUNTIME_DIR")
 	}
 
 	// Setup XDG_RUNTIME_DIR