cli: add geo-replication log-rotate command

Rotating geo-replication master/monitor log files from cli.
On invocation, the log file for a given master-slave session
is backed up with the current timestamp suffixed to the file
name and signal is sent to gsyncd to start logging to a new
log file.

Sample commands:

* Rotate log file for this <master>:<slave> session:
gluster volume geo-replication <master> <slave> log-rotate

* Rotate log files for all session for master volume <master>
gluster volume geo-replication <master> log-rotate

* Rotate log files for all sessions:
gluster volume geo-replication log-rotate

Change-Id: I75f641b4e082a04d5373c18583ca4a1d9651d27a
BUG: 3519
Reviewed-on: http://review.gluster.com/529
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Csaba Henk <csaba@gluster.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/xlators/features/marker/utils/syncdaemon/syncdutils.py b/xlators/features/marker/utils/syncdaemon/syncdutils.py
index e3098d5f4..59defa711 100644
--- a/xlators/features/marker/utils/syncdaemon/syncdutils.py
+++ b/xlators/features/marker/utils/syncdaemon/syncdutils.py
@@ -6,9 +6,11 @@ import fcntl
 import shutil
 import logging
 from threading import Lock, Thread as baseThread
-from errno import EACCES, EAGAIN, EPIPE, ENOTCONN
+from errno import EACCES, EAGAIN, EPIPE, ENOTCONN, EINTR
 from signal import SIGTERM, SIGKILL
 from time import sleep
+import select as oselect
+from os import waitpid as owaitpid
 try:
     from cPickle import PickleError
 except ImportError:
@@ -247,3 +249,21 @@ def boolify(s):
         logging.warn("Unknown string (%s) in string to boolean conversion defaulting to False\n" % (s))
 
     return rv
+
+def eintr_wrap(func, exc, *a):
+    """
+    wrapper around syscalls resilient to interrupt caused
+    by signals
+    """
+    while True:
+        try:
+            return func(*a)
+        except exc, ex:
+            if not ex[0] == EINTR:
+                raise GsyncdError(ex[1])
+
+def select(*a):
+    return eintr_wrap(oselect.select, oselect.error, *a)
+
+def waitpid (*a):
+    return eintr_wrap(owaitpid, OSError, *a)