tasks: add an rbd-mirror task

This simply runs the rbd-mirror daemon. Nothing special is needed
since the runtime files (logs, asok, etc) go to the standard ceph
locations.

Signed-off-by: Josh Durgin <jdurgin@redhat.com>

tasks/rbd_mirror.py

@@ -0,0 +1,117 @@
+"""
+Task for running rbd mirroring daemons and configuring mirroring
+"""
+
+import logging
+
+from teuthology.orchestra import run
+from teuthology import misc
+from teuthology.exceptions import ConfigError
+from teuthology.task import Task
+from util import get_remote_for_role
+
+log = logging.getLogger(__name__)
+
+
+class RBDMirror(Task):
+    """
+    Run an rbd-mirror daemon to sync rbd images between clusters.
+
+    This requires two clients (one from each cluster) on the same host
+    to connect with. The pool configuration should be adjusted by later
+    test scripts to include the remote client and cluster name. This task
+    just needs to know how to connect to the local cluster.
+
+    For example:
+
+        roles:
+        - [primary.mon.a, primary.osd.0, primary.osd.1, primary.osd.2]
+        - [secondary.mon.a, secondary.osd.0, secondary.osd.1, secondary.osd.2]
+        - [primary.client.mirror, secondary.client.mirror]
+        tasks:
+        - ceph:
+            cluster: primary
+        - ceph:
+            cluster: secondary
+        - rbd-mirror:
+            client: primary.client.mirror
+
+    To mirror back to the primary cluster as well, add another
+    rbd_mirror instance:
+
+        - rbd-mirror:
+            client: secondary.client.mirror
+
+    Possible options for this task are:
+
+        client: role - ceph client to connect as
+        valgrind: [--tool=<valgrind tool>] - none by default
+        coverage: bool - whether this run may be collecting coverage data
+    """
+    def __init__(self, ctx, config):
+        super(RBDMirror, self).__init__(ctx, config)
+        self.log = log
+
+    def setup(self):
+        super(RBDMirror, self).setup()
+        try:
+            self.client = self.config['client']
+        except KeyError:
+            raise ConfigError('rbd-mirror requires a client to connect with')
+
+        self.cluster_name, type_, self.client_id = misc.split_role(self.client)
+
+        if type_ != 'client':
+            msg = 'client role ({0}) must be a client'.format(self.client)
+            raise ConfigError(msg)
+
+        self.remote = get_remote_for_role(self.ctx, self.client)
+
+    def begin(self):
+        super(RBDMirror, self).begin()
+        testdir = misc.get_testdir(self.ctx)
+        daemon_signal = 'kill'
+        if 'coverage' in self.config or 'valgrind' in self.config:
+            daemon_signal = 'term'
+
+        args = [
+            'adjust-ulimits',
+            'ceph-coverage',
+            '{tdir}/archive/coverage'.format(tdir=testdir),
+            'daemon-helper',
+            daemon_signal,
+            ]
+
+        if 'valgrind' in self.config:
+            args = misc.get_valgrind_args(
+                testdir,
+                'rbd-mirror-{id}'.format(id=self.client),
+                args,
+                self.config.get('valgrind')
+            )
+
+        args.extend([
+            'rbd-mirror',
+            '--cluster',
+            self.cluster_name,
+            '--id',
+            self.client_id,
+            ])
+
+        self.ctx.daemons.add_daemon(
+            self.remote, 'rbd-mirror', self.client,
+            cluster=self.cluster_name,
+            args=args,
+            logger=self.log.getChild(self.client),
+            stdin=run.PIPE,
+            wait=False,
+        )
+
+    def end(self):
+        mirror_daemon = self.ctx.daemons.get_daemon('rbd-mirror',
+                                                    self.client,
+                                                    self.cluster_name)
+        mirror_daemon.stop()
+        super(RBDMirror, self).end()
+
+task = RBDMirror