/usr/sbin/gcron is in glusterfs-server 3.7.6-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | #!/usr/bin/env python
#
# Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
#
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
from __future__ import print_function
import subprocess
import os
import os.path
import sys
import time
import logging
import logging.handlers
import fcntl
GCRON_TASKS = "/var/run/gluster/shared_storage/snaps/glusterfs_snap_cron_tasks"
GCRON_CROND_TASK = "/etc/cron.d/glusterfs_snap_cron_tasks"
GCRON_RELOAD_FLAG = "/var/run/gluster/crond_task_reload_flag"
LOCK_FILE_DIR = "/var/run/gluster/shared_storage/snaps/lock_files/"
log = logging.getLogger("gcron-logger")
start_time = 0.0
def initLogger(script_name):
log.setLevel(logging.DEBUG)
logFormat = "[%(asctime)s %(filename)s:%(lineno)s %(funcName)s] "\
"%(levelname)s %(message)s"
formatter = logging.Formatter(logFormat)
sh = logging.handlers.SysLogHandler()
sh.setLevel(logging.ERROR)
sh.setFormatter(formatter)
process = subprocess.Popen(["gluster", "--print-logdir"],
stdout=subprocess.PIPE)
out, err = process.communicate()
if process.returncode == 0:
logfile = os.path.join(out.strip(), script_name[:-3]+".log")
fh = logging.FileHandler(logfile)
fh.setLevel(logging.DEBUG)
fh.setFormatter(formatter)
log.addHandler(sh)
log.addHandler(fh)
def takeSnap(volname="", snapname=""):
success = True
if volname == "":
log.debug("No volname given")
return False
if snapname == "":
log.debug("No snapname given")
return False
cli = ["gluster",
"snapshot",
"create",
snapname,
volname]
log.debug("Running command '%s'", " ".join(cli))
p = subprocess.Popen(cli, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = p.communicate()
rv = p.returncode
log.debug("Command '%s' returned '%d'", " ".join(cli), rv)
if rv:
log.error("Snapshot of %s failed", volname)
log.error("Command output:")
log.error(err)
success = False
else:
log.info("Snapshot of %s successful", volname)
return success
def doJob(name, lockFile, jobFunc, volname):
success = True
try:
f = os.open(lockFile, os.O_RDWR | os.O_NONBLOCK)
try:
fcntl.flock(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
mtime = os.path.getmtime(lockFile)
global start_time
log.debug("%s last modified at %s", lockFile, time.ctime(mtime))
if mtime < start_time:
log.debug("Processing job %s", name)
if jobFunc(volname, name):
log.info("Job %s succeeded", name)
else:
log.error("Job %s failed", name)
success = False
os.utime(lockFile, None)
else:
log.info("Job %s has been processed already", name)
fcntl.flock(f, fcntl.LOCK_UN)
except IOError as (errno, strerror):
log.info("Job %s is being processed by another agent", name)
os.close(f)
except IOError as (errno, strerror):
log.debug("Failed to open lock file %s : %s", lockFile, strerror)
log.error("Failed to process job %s", name)
success = False
return success
def main():
script_name = os.path.basename(__file__)
initLogger(script_name)
global start_time
if sys.argv[1] == "--update":
if not os.path.exists(GCRON_TASKS):
# Create a flag in /var/run/gluster which indicates that this nodes
# doesn't have access to GCRON_TASKS right now, so that
# when the mount is available and GCRON_TASKS is available
# the flag will tell this routine to reload GCRON_CROND_TASK
try:
f = os.open(GCRON_RELOAD_FLAG, os.O_CREAT | os.O_NONBLOCK, 0644)
os.close(f)
except OSError as (errno, strerror):
if errno != EEXIST:
log.error("Failed to create %s : %s",
GCRON_RELOAD_FLAG, strerror)
output("Failed to create %s. Error: %s"
% (GCRON_RELOAD_FLAG, strerror))
return
if not os.path.exists(GCRON_CROND_TASK):
return
# As GCRON_TASKS exists now, we should check if GCRON_RELOAD_FLAG
# also exists. If so we should touch GCRON_CROND_TASK and remove
# the GCRON_RELOAD_FLAG
if os.path.exists(GCRON_RELOAD_FLAG):
try:
os.remove(GCRON_RELOAD_FLAG);
process = subprocess.Popen(["touch", "-h", GCRON_CROND_TASK],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = process.communicate()
if process.returncode != 0:
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, err)
except (IOError, OSError) as (errno, strerror):
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, strerror)
return
if os.lstat(GCRON_TASKS).st_mtime > \
os.lstat(GCRON_CROND_TASK).st_mtime:
try:
process = subprocess.Popen(["touch", "-h", GCRON_CROND_TASK],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = process.communicate()
if process.returncode != 0:
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, err)
except IOError as (errno, strerror):
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, strerror)
return
volname = sys.argv[1]
jobname = sys.argv[2]
locking_file = os.path.join(LOCK_FILE_DIR, jobname)
log.debug("locking_file = %s", locking_file)
log.debug("volname = %s", volname)
log.debug("jobname = %s", jobname)
start_time = int(time.time())
doJob("Scheduled-" + jobname + "-" + volname, locking_file, takeSnap, volname)
if __name__ == "__main__":
main()
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