geo-rep / gsyncd: add support for sending xtimes through rsync

Note that in said mode metadata synchronization is best effort:
rsync syncs metadata at last so if rsync is interrupted in between
xattr sync and metadata sync stages, then file will be considered
in sync

Change-Id: I1c75eab33b0a1000abf3ad36b2d484a89eeda1bd
BUG: 841062
Signed-off-by: Csaba Henk <csaba@redhat.com>
Reviewed-on: http://review.gluster.com/3683
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>

3 files changed, 35 insertions, 14 deletions

diff --git a/xlators/features/marker/utils/syncdaemon/gsyncd.py b/xlators/features/marker/utils/syncdaemon/gsyncd.py
index 17b10e5a..9e946946 100644
--- a/xlators/features/marker/utils/syncdaemon/gsyncd.py
+++ b/xlators/features/marker/utils/syncdaemon/gsyncd.py
@@ -159,6 +159,7 @@ def main_i():
     op.add_option('-l', '--log-file',      metavar='LOGF',  type=str, action='callback', callback=store_abs)
     op.add_option('--state-file',          metavar='STATF', type=str, action='callback', callback=store_abs)
     op.add_option('--ignore-deletes',      default=False, action='store_true')
+    op.add_option('--use-rsync-xattrs',    default=False, action='store_true')
     op.add_option('-L', '--log-level',     metavar='LVL')
     op.add_option('-r', '--remote-gsyncd', metavar='CMD',   default=os.path.abspath(sys.argv[0]))
     op.add_option('--volume-id',           metavar='UUID')
@@ -213,7 +214,7 @@ def main_i():
     op.add_option('--canonicalize-escape-url', dest='url_print', action='callback', callback=store_local_curry('canon_esc'))
 
     tunables = [ norm(o.get_opt_string()[2:]) for o in op.option_list if o.callback in (store_abs, 'store_true', None) and o.get_opt_string() not in ('--version', '--help') ]
-    remote_tunables = [ 'listen', 'go_daemon', 'timeout', 'session_owner', 'config_file' ]
+    remote_tunables = [ 'listen', 'go_daemon', 'timeout', 'session_owner', 'config_file', 'use_rsync_xattrs' ]
     rq_remote_tunables = { 'listen': True }
 
     # precedence for sources of values: 1) commandline, 2) cfg file, 3) defaults
diff --git a/xlators/features/marker/utils/syncdaemon/master.py b/xlators/features/marker/utils/syncdaemon/master.py
index 945ebb75..a6aeb53d 100644
--- a/xlators/features/marker/utils/syncdaemon/master.py
+++ b/xlators/features/marker/utils/syncdaemon/master.py
@@ -54,12 +54,13 @@ def gmaster_builder():
     """produce the GMaster class variant corresponding
        to sync mode"""
     this = sys.modules[__name__]
-    mixin = gconf.special_sync_mode
-    if not mixin:
-        mixin = 'normal'
-    logging.info('setting up master for %s sync mode' % mixin)
-    mixin = getattr(this, mixin.capitalize() + 'Mixin')
-    class _GMaster(GMasterBase, mixin):
+    modemixin = gconf.special_sync_mode
+    if not modemixin:
+        modemixin = 'normal'
+    logging.info('setting up master for %s sync mode' % modemixin)
+    modemixin = getattr(this, modemixin.capitalize() + 'Mixin')
+    sendmarkmixin = boolify(gconf.use_rsync_xattrs) and SendmarkNormalMixin or SendmarkRsyncMixin
+    class _GMaster(GMasterBase, modemixin, sendmarkmixin):
         pass
     return _GMaster
 
@@ -295,6 +296,19 @@ class BlindMixin(object):
         self.slave.server.set_xtime_vec(path, xtd)
 
 
+# Further mixins for certain tunable behaviors
+
+class SendmarkNormalMixin(object):
+
+    def sendmark_regular(self, *a, **kw):
+        return self.sendmark(self, *a, **kw)
+
+class SendmarkRsyncMixin(object):
+
+    def sendmark_regular(self, *a, **kw):
+        pass
+
+
 class GMasterBase(object):
     """abstract class impementling master role"""
 
@@ -753,7 +767,7 @@ class GMasterBase(object):
                 def regjob(e, xte, pb):
                     if pb.wait():
                         logging.debug("synced " + e)
-                        self.sendmark(e, xte)
+                        self.sendmark_regular(e, xte)
                         return True
                     else:
                         logging.warn("failed to sync " + e)
diff --git a/xlators/features/marker/utils/syncdaemon/resource.py b/xlators/features/marker/utils/syncdaemon/resource.py
index 9ca226f9..47e4748d 100644
--- a/xlators/features/marker/utils/syncdaemon/resource.py
+++ b/xlators/features/marker/utils/syncdaemon/resource.py
@@ -19,7 +19,7 @@ import repce
 from repce import RepceServer, RepceClient
 from  master import gmaster_builder
 import syncdutils
-from syncdutils import GsyncdError, select, privileged
+from syncdutils import GsyncdError, select, privileged, boolify
 
 UrlRX  = re.compile('\A(\w+)://([^ *?[]*)\Z')
 HostRX = re.compile('[a-z\d](?:[a-z\d.-]*[a-z\d])?', re.I)
@@ -472,6 +472,10 @@ class SlaveLocal(object):
         stop servicing if a timeout is configured and got no
         keep-alime in that inteval
         """
+
+        if boolify(gconf.use_rsync_xattrs) and not privileged():
+            raise GsyncdError("using rsync for extended attributes is not supported")
+
         repce = RepceServer(self.server, sys.stdin, sys.stdout, int(gconf.sync_jobs))
         t = syncdutils.Thread(target=lambda: (repce.service_loop(),
                                               syncdutils.finalize()))
@@ -498,12 +502,13 @@ class SlaveRemote(object):
         communicate throuh its stdio.
         """
         slave = opts.get('slave', self.url)
+        extra_opts = []
         so = getattr(gconf, 'session_owner', None)
         if so:
-            so_args = ['--session-owner', so]
-        else:
-            so_args = []
-        po = Popen(rargs + gconf.remote_gsyncd.split() + so_args + \
+            extra_opts += ['--session-owner', so]
+        if boolify(gconf.use_rsync_xattrs):
+            extra_opts.append('--use-rsync-xattrs')
+        po = Popen(rargs + gconf.remote_gsyncd.split() + extra_opts + \
                    ['-N', '--listen', '--timeout', str(gconf.timeout), slave],
                    stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         gconf.transport = po
@@ -532,7 +537,8 @@ class SlaveRemote(object):
             raise GsyncdError("no files to sync")
         logging.debug("files: " + ", ".join(files))
         argv = gconf.rsync_command.split() + ['-aR', '--super', '--numeric-ids', '--no-implied-dirs'] + \
-               gconf.rsync_options.split() +  files + list(args)
+               gconf.rsync_options.split() + (boolify(gconf.use_rsync_xattrs) and ['--xattrs'] or []) + \
+               files + list(args)
         po = Popen(argv, stderr=subprocess.PIPE)
         po.wait()
         po.terminate_geterr(fail_on_err = False)