ceph-disk: do not activate device that is not ready

If the journal (or data) device is not ready when we are activating the
data (or journal) device, just print an info message and exit with 0 so
that the ceph-disk systemd service won't fail in this case.

Fixes: http://tracker.ceph.com/issues/15990
Signed-off-by: Boris Ranto <branto@redhat.com>

src/ceph-disk/ceph_disk/main.py

@@ -3311,14 +3311,21 @@ def main_activate(args):
         else:
             raise Error('%s is not a directory or block device' % args.path)
 
+        # exit with 0 if the journal device is not up, yet 
+        # journal device will do the activation
+        osd_journal = '{path}/journal'.format(path=osd_data)
+        if os.path.islink(osd_journal) and not os.access(osd_journal, os.F_OK):
+            LOG.info("activate: Journal not present, not starting, yet")
+            return
+
         if (not args.no_start_daemon and args.mark_init == 'none'):
             command_check_call(
                 [
                     'ceph-osd',
                     '--cluster={cluster}'.format(cluster=cluster),
                     '--id={osd_id}'.format(osd_id=osd_id),
                     '--osd-data={path}'.format(path=osd_data),
-                    '--osd-journal={path}/journal'.format(path=osd_data),
+                    '--osd-journal={journal}'.format(journal=osd_journal),
                 ],
             )
 
@@ -3713,6 +3720,12 @@ def main_activate_space(name, args):
             LOG.info('suppressed activate request on %s', path)
             return
 
+        # warn and exit with 0 if the data device is not up, yet
+        # data device will do the activation
+        if not os.access(path, os.F_OK):
+            LOG.info("activate_space: OSD device not present, not starting, yet")
+            return
+
         (cluster, osd_id) = mount_activate(
             dev=path,
             activate_key_template=args.activate_key_template,