1 files changed, 101 insertions, 0 deletions
diff --git a/src/ceph-volume/ceph_volume/systemd/systemctl.py b/src/ceph-volume/ceph_volume/systemd/systemctl.py
new file mode 100644
index 000000000..778ad1479
--- /dev/null
+++ b/src/ceph-volume/ceph_volume/systemd/systemctl.py
@@ -0,0 +1,101 @@
+"""
+Utilities to control systemd units
+"""
+import logging
+
+from ceph_volume import process
+
+logger = logging.getLogger(__name__)
+
+def start(unit):
+    process.run(['systemctl', 'start', unit])
+
+
+def stop(unit):
+    process.run(['systemctl', 'stop', unit])
+
+
+def enable(unit, runtime=False):
+    if runtime:
+        process.run(['systemctl', 'enable', '--runtime', unit])
+    else:
+        process.run(['systemctl', 'enable', unit])
+
+
+def disable(unit):
+    process.run(['systemctl', 'disable', unit])
+
+
+def mask(unit):
+    process.run(['systemctl', 'mask', unit])
+
+
+def is_active(unit):
+    out, err, rc = process.call(
+        ['systemctl', 'is-active', unit],
+        verbose_on_failure=False
+    )
+    return rc == 0
+
+def get_running_osd_ids():
+    out, err, rc = process.call([
+        'systemctl',
+        'show',
+        '--no-pager',
+        '--property=Id',
+        '--state=running',
+        'ceph-osd@*',
+    ])
+    osd_ids = []
+    if rc == 0:
+        for line in out:
+            if line:
+                # example line looks like: Id=ceph-osd@1.service
+                try:
+                    osd_id = line.split("@")[1].split(".service")[0]
+                    osd_ids.append(osd_id)
+                except (IndexError, TypeError):
+                    logger.warning("Failed to parse output from systemctl: %s", line)
+    return osd_ids
+
+def start_osd(id_):
+    return start(osd_unit % id_)
+
+
+def stop_osd(id_):
+    return stop(osd_unit % id_)
+
+
+def enable_osd(id_):
+    return enable(osd_unit % id_, runtime=True)
+
+
+def disable_osd(id_):
+    return disable(osd_unit % id_)
+
+
+def osd_is_active(id_):
+    return is_active(osd_unit % id_)
+
+
+def enable_volume(id_, fsid, device_type='lvm'):
+    return enable(volume_unit % (device_type, id_, fsid))
+
+
+def mask_ceph_disk():
+    # systemctl allows using a glob like '*' for masking, but there was a bug
+    # in that it wouldn't allow this for service templates. This means that
+    # masking ceph-disk@* will not work, so we must link the service directly.
+    # /etc/systemd takes precedence regardless of the location of the unit
+    process.run(
+        ['ln', '-sf', '/dev/null', '/etc/systemd/system/ceph-disk@.service']
+    )
+
+
+#
+# templates
+#
+
+osd_unit = "ceph-osd@%s"
+ceph_disk_unit = "ceph-disk@%s"
+volume_unit = "ceph-volume@%s-%s-%s"