ceph-volume: lvm add the actual trigger subcommand handler

Signed-off-by: Alfredo Deza <adeza@redhat.com>

diff --git a/src/ceph-volume/ceph_volume/devices/lvm/trigger.py b/src/ceph-volume/ceph_volume/devices/lvm/trigger.py
new file mode 100644 (file)
index 0000000..87f58eb
--- /dev/null
+++ b/src/ceph-volume/ceph_volume/devices/lvm/trigger.py
@@ -0,0 +1,68 @@
+from __future__ import print_function
+import argparse
+from textwrap import dedent
+from ceph_volume.exceptions import SuffixParsingError
+from .activate import Activate
+
+
+def parse_osd_id(string):
+    osd_id = string.split('-', 1)[0]
+    if not osd_id:
+        raise SuffixParsingError('OSD id', string)
+    if osd_id.isdigit():
+        return osd_id
+    raise SuffixParsingError('OSD id', string)
+
+
+def parse_osd_uuid(string):
+    osd_id = '%s-' % parse_osd_id(string)
+    # remove the id first
+    osd_uuid = string.split(osd_id)[-1]
+    if not osd_uuid:
+        raise SuffixParsingError('OSD uuid', string)
+    return osd_uuid
+
+
+class Trigger(object):
+
+    help = 'systemd helper to activate an OSD'
+
+    def __init__(self, argv):
+        self.argv = argv
+
+    def main(self):
+        sub_command_help = dedent("""
+        ** DO NOT USE DIRECTLY **
+        This tool is meant to help the systemd unit that knows about OSDs.
+
+        Proxy OSD activation to ``ceph-volume lvm activate`` by parsing the
+        input from systemd, detecting the UUID and ID associated with an OSD::
+
+            ceph-volume lvm trigger {SYSTEMD-DATA}
+
+        The systemd "data" is expected to be in the format of::
+
+            {OSD ID}-{OSD UUID}
+
+        The lvs associated with the OSD need to have been prepared previously,
+        so that all needed tags and metadata exist.
+        """)
+        parser = argparse.ArgumentParser(
+            prog='ceph-volume lvm trigger',
+            formatter_class=argparse.RawDescriptionHelpFormatter,
+            description=sub_command_help,
+        )
+
+        parser.add_argument(
+            'systemd_data',
+            metavar='SYSTEMD_DATA',
+            nargs='?',
+            help='Data from a systemd unit containing ID and UUID of the OSD, like asdf-lkjh-0'
+        )
+        if len(self.argv) == 0:
+            print(sub_command_help)
+            return
+        args = parser.parse_args(self.argv)
+        osd_id = parse_osd_id(args.systemd_data)
+        osd_uuid = parse_osd_uuid(args.systemd_data)
+        Activate([osd_id, osd_uuid]).main()