nspawn: move uid shift/chown() code into shared/

src/test/meson.build

@@ -375,6 +375,11 @@ executables += [
                 'sources' : files('test-parse-util.c'),
                 'dependencies' : libm,
         },
+        test_template + {
+                'sources' : files('test-shift-uid.c'),
+                'dependencies' : libacl,
+                'type' : 'manual',
+        },
         test_template + {
                 'sources' : files('test-process-util.c'),
                 'dependencies' : threads,

src/test/test-shift-uid.c

@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stdlib.h>
+
+#include "log.h"
+#include "shift-uid.h"
+#include "user-util.h"
+#include "string-util.h"
+#include "tests.h"
+
+int main(int argc, char *argv[]) {
+        uid_t shift, range;
+        int r;
+
+        test_setup_logging(LOG_DEBUG);
+
+        if (argc != 4) {
+                log_error("Expected PATH SHIFT RANGE parameters.");
+                return EXIT_FAILURE;
+        }
+
+        r = parse_uid(argv[2], &shift);
+        if (r < 0) {
+                log_error_errno(r, "Failed to parse UID shift %s.", argv[2]);
+                return EXIT_FAILURE;
+        }
+
+        r = parse_gid(argv[3], &range);
+        if (r < 0) {
+                log_error_errno(r, "Failed to parse UID range %s.", argv[3]);
+                return EXIT_FAILURE;
+        }
+
+        r = path_patch_uid(argv[1], shift, range);
+        if (r < 0) {
+                log_error_errno(r, "Failed to patch directory tree: %m");
+                return EXIT_FAILURE;
+        }
+
+        log_info("Changed: %s", yes_no(r));
+
+        return EXIT_SUCCESS;
+}