From b330ac0b2ed0425805c2849ba11b83924ab958c0 Mon Sep 17 00:00:00 2001
From: Guido Trotter <ultrotter@google.com>
Date: Wed, 23 Jul 2008 14:23:31 +0000
Subject: [PATCH] Add utils.{Write,Remove}PidFile
WritePidFile is a helper function that writes the current pid in a
pidfile within the ganeti run directory. RemovePidFile tries to delete
it.
Reviewed-by: iustinp
---
lib/utils.py | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/lib/utils.py b/lib/utils.py
index 05240eabb..e90035286 100644
--- a/lib/utils.py
+++ b/lib/utils.py
@@ -1051,6 +1051,42 @@ def Daemonize(logfile, noclose_fds=None):
return 0
+def _DaemonPidFileName(name):
+ """Compute a ganeti pid file absolute path, given the daemon name.
+
+ """
+ return os.path.join(constants.RUN_GANETI_DIR, "%s.pid" % name)
+
+
+def WritePidFile(name):
+ """Write the current process pidfile.
+
+ The file will be written to constants.RUN_GANETI_DIR/name.pid
+
+ """
+ pid = os.getpid()
+ pidfilename = _DaemonPidFileName(name)
+ if IsPidFileAlive(pidfilename):
+ raise GenericError("%s contains a live process" % pidfilename)
+
+ WriteFile(pidfilename, data="%d\n" % pid)
+
+
+def RemovePidFile(name):
+ """Remove the current process pidfile.
+
+ Any errors are ignored.
+
+ """
+ pid = os.getpid()
+ pidfilename = _DaemonPidFileName(name)
+ # TODO: we could check here that the file contains our pid
+ try:
+ RemoveFile(pidfilename)
+ except:
+ pass
+
+
def FindFile(name, search_path, test=os.path.exists):
"""Look for a filesystem object in a given path.
--
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