Restart tester if updated (refs #24053).

tester.py

@@ -71,13 +71,14 @@ def raid_idle():
 
 
 class Tester():
-    USAGE = '''%s [-e] [-f] [-b] [-d] [-h] [msuser]
+    USAGE = '''%s [-e] [-f] [-b] [-n] [-d] [-h] [msuser]
     -e: send email with report.
     -f: send email with report only if at least one test failed.
     -b: run only basic tests (exclude mediaserver tests).
+    -n: do not update envsetup repository.
     -d: debug mode (can be started with non root users).
     -h: show this message.''' % __file__
-    VALID_ARGS = ['-e', '-f', '-b', '-d', '-h']
+    VALID_ARGS = ['-e', '-f', '-b', '-n', '-d', '-h']
     MAX_LOG_FILES = 50
     NO_MAIL_FAILURES_COUNT = 5
 
@@ -119,7 +120,14 @@ class Tester():
             log('This script should be run as root user.')
             sys.exit(1)
         # Update envsetup files
-        subprocess.call(['python3', 'update_envsetup.py'])
+        if '-n' not in args:
+            tester_path = os.path.join(root_dir, os.path.basename(__file__))
+            mtime = os.path.getmtime(tester_path)
+            subprocess.call(['python3', 'update_envsetup.py'])
+            if mtime != os.path.getmtime(tester_path):
+                log('The script has changed, restarting it...')
+                os.execl('/bin/python3', 'python3', tester_path, '-n', *args)
+                sys.exit(1)  # not reachable
         # Load conf
         conf = utils.load_conf()
         if not conf: