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@@ -20,6 +20,7 @@
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#
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+import fcntl
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from qubes.qubes import QubesVmCollection
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import os.path
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@@ -43,6 +44,19 @@ def main():
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verbose = False
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if len(sys.argv) > 1 and sys.argv[1] in [ '--verbose', '-v' ]:
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verbose = True
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+
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+ lockfile_name = "/var/run/qubes/qvm-sync-clock.lock"
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+ if os.path.exists(lockfile_name):
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+ lockfile = open(lockfile_name, "r")
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+ else:
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+ lockfile = open(lockfile_name, "w")
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+
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+ fcntl.fcntl(lockfile.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
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+ try:
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+ fcntl.flock(lockfile.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
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+ except IOError:
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+ print >>sys.stderr, "qvm-sync-clock already running, aborting"
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+ sys.exit(1)
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qvm_collection = QubesVmCollection()
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qvm_collection.lock_db_for_reading()
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@@ -98,5 +112,9 @@ def main():
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print >> sys.stderr, "ERROR syncing time in VM '%s': %s" % (vm.name, str(e))
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pass
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+ # order is important!
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+ os.unlink(lockfile_name)
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+ lockfile.close()
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+
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main()
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