Start adding a 'migrator' module

that can be used to aid in the moving
of older versions of cloud-inits data
to newer versions of cloud-inits data.

1. Move the semaphores for the current instance
   to there canonicalized names and use the 
   canonicalized in the file 'locking' code

1 files changed, 53 insertions, 0 deletions

diff --git a/cloudinit/config/cc_migrator.py b/cloudinit/config/cc_migrator.py
new file mode 100644
index 00000000..b71d1d17
--- /dev/null
+++ b/cloudinit/config/cc_migrator.py
@@ -0,0 +1,53 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2012 Yahoo! Inc.
+#
+#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License version 3, as
+#    published by the Free Software Foundation.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import shutil
+
+from cloudinit import helpers
+from cloudinit import util
+
+from cloudinit.settings import PER_ALWAYS
+
+frequency = PER_ALWAYS
+
+
+def _migrate_canon_sems(cloud):
+    sem_path = cloud.paths.get_ipath('sem')
+    if not sem_path or not os.path.exists(sem_path):
+        return 0
+    am_adjusted = 0
+    for p in os.listdir(sem_path):
+        full_path = os.path.join(sem_path, p)
+        if os.path.isfile(full_path):
+            canon_p = helpers.canon_sem_name(p)
+            if canon_p != p:
+                new_path = os.path.join(sem_path, p)
+                shutil.move(full_path, new_path)
+                am_adjusted += 1
+    return am_adjusted
+
+
+def handle(name, cfg, cloud, log, _args):
+    do_migrate = util.get_cfg_option_str(cfg, "migrate", True)
+    if not util.translate_bool(do_migrate):
+        log.debug("Skipping module named %s, migration disabled", name)
+        return
+    sems_moved = _migrate_canon_sems(cloud)
+    log.debug("Migrated %s semaphore files to there canonicalized names",
+              sems_moved)