snapshot/scheduler: Use /var/run/gluster/shared_storage/snaps/tmp_file

for writing data into tmp file and then making an atomic rename to
the required filename.

The reason for using this location is that it adheres to
the selinux policies.

Also moving the update of the current_scheduler file,
under the lock so as to avoid multiple writes

Change-Id: I61e62b5daf6f1bce2319f64f7b1dfb8b93726077
BUG: 1239269
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/11535
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/extras/snap_scheduler/snap_scheduler.py b/extras/snap_scheduler/snap_scheduler.py
index 09015c52f79..ce808cf16ba 100755
--- a/extras/snap_scheduler/snap_scheduler.py
+++ b/extras/snap_scheduler/snap_scheduler.py
@@ -423,7 +423,7 @@ def edit_schedules(jobname, schedule, volname):
 
 def initialise_scheduler():
     try:
-        with open("/tmp/crontab", "w+", 0644) as f:
+        with open(TMP_FILE, "w+", 0644) as f:
             updater = ("* * * * * root PATH=$PATH:/usr/local/sbin:"
                        "/usr/sbin gcron.py --update\n")
             f.write("%s\n" % updater)
@@ -431,11 +431,11 @@ def initialise_scheduler():
             os.fsync(f.fileno())
             f.close()
     except IOError as (errno, strerror):
-        log.error("Failed to open /tmp/crontab. Error: %s.", strerror)
+        log.error("Failed to open %s. Error: %s.", TMP_FILE, strerror)
         ret = INIT_FAILED
         return ret
 
-    shutil.move("/tmp/crontab", GCRON_UPDATE_TASK)
+    shutil.move(TMP_FILE, GCRON_UPDATE_TASK)
 
     if not os.path.lexists(GCRON_TASKS):
         try:
@@ -491,6 +491,9 @@ def syntax_checker(args):
 
 
 def perform_operation(args):
+    if not os.path.exists(CURRENT_SCHEDULER):
+        update_current_scheduler("none")
+
     # Initialise snapshot scheduler on local node
     if args.action == "init":
         ret = initialise_scheduler()
@@ -651,9 +654,6 @@ def main(argv):
                        % (LOCK_FILE_DIR, strerror))
                 return INTERNAL_ERROR
 
-    if not os.path.exists(CURRENT_SCHEDULER):
-        update_current_scheduler("none")
-
     try:
         f = os.open(LOCK_FILE, os.O_CREAT | os.O_RDWR | os.O_NONBLOCK, 0644)
         try: