Fix #1071 issue where Deluge will fail to start if there is a stale ipc lockfile

ChangeLog

@@ -7,6 +7,7 @@
 	* Fix adding torrents from the Queued Torrents dialog
 	* Fix disabling/enabling plugins after switching daemons
 	* Reduce height of Add Torrent Dialog by ~80 pixels
+	* Fix issue where Deluge will fail to start if there is a stale ipc lockfile
 
 ==== Web ====
 	* Fix installing the deluge-web manpage

deluge/ui/gtkui/ipcinterface.py

@@ -35,7 +35,7 @@
 
 
 import sys
-import os.path
+import os
 import base64
 
 import deluge.rencode
@@ -104,6 +104,19 @@ class IPCInterface(component.Component):
                 reactor.run()
                 sys.exit(0)
         else:
+            lockfile = socket + ".lock"
+            log.debug("Checking if lockfile exists: %s", lockfile)
+            if os.path.lexists(lockfile):
+                try:
+                    os.kill(int(os.readlink(lockfile)), 0)
+                except OSError:
+                    log.debug("Removing lockfile since it's stale.")
+                    try:
+                        os.remove(lockfile)
+                        os.remove(socket)
+                    except Exception, e:
+                        log.error("Problem deleting lockfile or socket file!")
+                        log.exception(e)
             try:
                 self.factory = Factory()
                 self.factory.protocol = IPCProtocolServer