initial code repo

[stor4nfv.git] / src / ceph / src / ceph-volume / ceph_volume / systemd / main.py

diff --git a/src/ceph/src/ceph-volume/ceph_volume/systemd/main.py b/src/ceph/src/ceph-volume/ceph_volume/systemd/main.py
new file mode 100644 (file)
index 0000000..bf24f0a
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+++ b/src/ceph/src/ceph-volume/ceph_volume/systemd/main.py
@@ -0,0 +1,108 @@
+"""
+This file is used only by systemd units that are passing their instance suffix
+as arguments to this script so that it can parse the suffix into arguments that
+``ceph-volume <sub command>`` can consume
+"""
+import os
+import sys
+import time
+import logging
+from ceph_volume import log, process
+from ceph_volume.exceptions import SuffixParsingError
+
+
+def parse_subcommand(string):
+    subcommand = string.split('-', 1)[0]
+    if not subcommand:
+        raise SuffixParsingError('subcommand', string)
+    return subcommand
+
+
+def parse_extra_data(string):
+    # get the subcommand to split on that
+    sub_command = parse_subcommand(string)
+
+    # the split will leave data with a dash, so remove that
+    data = string.split(sub_command)[-1]
+    if not data:
+        raise SuffixParsingError('data', string)
+    return data.lstrip('-')
+
+
+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)
+    osd_subcommand = '-%s' % parse_subcommand(string)
+    # remove the id first
+    trimmed_suffix = string.split(osd_id)[-1]
+    # now remove the sub command
+    osd_uuid = trimmed_suffix.split(osd_subcommand)[0]
+    if not osd_uuid:
+        raise SuffixParsingError('OSD uuid', string)
+    return osd_uuid
+
+
+def main(args=None):
+    """
+    Main entry point for the ``ceph-volume-systemd`` executable. ``args`` are
+    optional for easier testing of arguments.
+
+    Expected input is similar to::
+
+        ['/path/to/ceph-volume-systemd', '<type>-<extra metadata>']
+
+    For example::
+
+        [
+            '/usr/bin/ceph-volume-systemd',
+            'lvm-0-8715BEB4-15C5-49DE-BA6F-401086EC7B41'
+        ]
+
+    The first part of the argument is the only interesting bit, which contains
+    the metadata needed to proxy the call to ``ceph-volume`` itself.
+
+    Reusing the example, the proxy call to ``ceph-volume`` would look like::
+
+        ceph-volume lvm trigger 0-8715BEB4-15C5-49DE-BA6F-401086EC7B41
+
+    That means that ``lvm`` is used as the subcommand and it is **expected**
+    that a ``trigger`` sub-commmand will be present to make sense of the extra
+    piece of the string.
+
+    """
+    log.setup(name='ceph-volume-systemd.log', log_path='/var/log/ceph/ceph-volume-systemd.log')
+    logger = logging.getLogger('systemd')
+
+    args = args if args is not None else sys.argv
+    try:
+        suffix = args[-1]
+    except IndexError:
+        raise RuntimeError('no arguments supplied')
+    sub_command = parse_subcommand(suffix)
+    extra_data = parse_extra_data(suffix)
+    logger.info('raw systemd input received: %s', suffix)
+    logger.info('parsed sub-command: %s, extra data: %s', sub_command, extra_data)
+    command = ['ceph-volume', sub_command, 'trigger', extra_data]
+
+    tries = os.environ.get('CEPH_VOLUME_SYSTEMD_TRIES', 30)
+    interval = os.environ.get('CEPH_VOLUME_SYSTEMD_INTERVAL', 5)
+    while tries > 0:
+        try:
+            # don't log any output to the terminal, just rely on stderr/stdout
+            # going to logging
+            process.run(command, terminal_logging=False)
+            logger.info('successfully trggered activation for: %s', extra_data)
+            break
+        except RuntimeError as error:
+            logger.warning(error)
+            logger.warning('failed activating OSD, retries left: %s', tries)
+            tries -= 1
+            time.sleep(interval)