Better lockfile (don't complain when running multiple git-build)

git-build.sh

@@ -8,6 +8,10 @@
 
 BASEDIR="$HOME/.git-build"
 
+# So scripts can know we're still running (for autoupdater)
+echo "$BASHPID" > $BASEDIR/.LOCK
+
+
 # Default logging levels (error is always enabled)
 INFO=1
 DEBUG=0
@@ -72,10 +76,6 @@ run() {
 	(GITBUILDCONF="$CONFDIR" GITBUILDDIR="$BASEDIR" nohup $BASEDIR/$p_name $p_name > $BASEDIR/$p_name.log 2>&1) &
 }
 
-# So scripts can know we're still running (for autoupdater)
-# TODO needs to be reworked so multiple instances can run at the same time https://tildegit.org/southerntofu/git-build.sh/issues/13
-touch $BASEDIR/.LOCK
-
 # Overriden by -f/--force to force rebuild when no update is available
 FORCE=0
 
@@ -214,5 +214,8 @@ for p_name in ${PROJECTS[*]}; do
 	fi
 done
 
-# TODO: better locking mechanism
-rm $BASEDIR/.LOCK
+# Check the PID in lockfile is still ours, we don't want
+# to remove the lockfile if another git-build "owns" it
+if [[ "$(cat $BASEDIR/.LOCK)" = "$BASHPID" ]]; then
+    rm $BASEDIR/.LOCK
+fi