Add feature to enable forced reformatting of OSD devices.

config.yaml

@@ -7,6 +7,15 @@ options:
       .
       These devices are the range of devices that will be checked for and
       used across all service units.
+  osd-reformat:
+    type: string
+    description: |
+      By default, the charm will not re-format a device that already looks
+      as if it might be an OSD device.  This is a safeguard to try to
+      prevent data loss.
+      .
+      Specifying this option (any value) forces a reformat of any OSD devices
+      found which are not already mounted.
   ephemeral-unmount:
     type: string
     description: |

hooks/hooks.py

@@ -89,6 +89,13 @@ def get_conf(name):
     return None
 
 
+def reformat_osd():
+    if utils.config_get('osd-reformat') != "":
+        return True
+    else:
+        return False
+
+
 def osdize(dev):
     if not os.path.exists(dev):
         utils.juju_log('INFO',
@@ -99,7 +106,8 @@ def osdize(dev):
     if e_mountpoint != "":
         subprocess.call(['umount', e_mountpoint])
 
-    if ceph.is_osd_disk(dev):
+    if (ceph.is_osd_disk(dev) and not
+        reformat_osd()):
         utils.juju_log('INFO',
                        'Looks like {} is already an OSD, skipping.'
                        .format(dev))

revision

@@ -1 +1 @@
-5
+6