new invoke script

diff --git a/cgi-invoke b/cgi-invoke
new file mode 100755 (executable)
index 0000000..ea20307
--- /dev/null
+++ b/cgi-invoke
@@ -0,0 +1,11 @@
+#!/bin/sh
+set -e
+exec with-lock-ex -w data/graph-lock sh -ec '
+       if ! test -d cache; then
+               quicksand-setup ||:
+               mkdir $GRAPH_CGI_CACHE
+               rm -f cache
+               ln -s $GRAPH_CGI_CACHE cache
+       fi
+       ./cgi "$@"
+' x "$@"