linux_bundle: Use a lock file to avoid several instance of a bundle to be launched

To avoid rescanning the registry at each start we symlink the plugins
to some user directory and thus we can not have several bundle launched
at once

1 files changed, 20 insertions, 2 deletions

diff --git a/cerbero/packages/linux_bundle.py b/cerbero/packages/linux_bundle.py
index 7623d5c2..7b6c38d9 100644
--- a/cerbero/packages/linux_bundle.py
+++ b/cerbero/packages/linux_bundle.py
@@ -28,15 +28,33 @@ from cerbero.packages import PackagerBase
 
 
 LAUNCH_BUNDLE_COMMAND = """# Try to discover plugins only once
+LOCKFILE="/tmp/%(appname)s-bundle.lock"
+if [ -e $LOCKFILE ]
+then
+    PID=$(cat $LOCKFILE)
+    if kill -0 $PID 2> /dev/null
+    then
+        echo "$? $PID pitivi already running -> exiting"
+        exit 1
+    else
+        echo "Stalled process $PID allow restarting"
+    fi
+fi
+echo $$ > $LOCKFILE
+
 PLUGINS_SYMLINK=${HOME}/.cache/gstreamer-1.0/%(appname)s-gstplugins
+rm ${PLUGINS_SYMLINK} > /dev/null 2>&1
 ln -s ${APPDIR}/lib/gstreamer-1.0/ ${PLUGINS_SYMLINK}
 if [ $? -ne 0 ]; then
-    echo "Bundle is already running, exiting"
-    exit 1
+    export GST_PLUGIN_PATH=${APPDIR}/lib/gstreamer-1.0/
 else
     export GST_PLUGIN_PATH=${PLUGINS_SYMLINK}
 fi
 
+trap 'ECODE=$?;
+      echo "[statsgen] Removing lock. Exit: ${ETXT[ECODE]}($ECODE)" >&2
+      rm "${PLUGINS_SYMLINK}" "${LOCKFILE}"' 0
+
 which gdk-pixbuf-query-loaders > /dev/null 2>&1
 if [ $? -eq 0 ]; then
     export GDK_PIXBUF_MODULE_FILE=/tmp/$(basename $APPDIR).gdk-pixbuf-loader.cache