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[rrd-graphs.git] / cgi-invoke

diff --git a/cgi-invoke b/cgi-invoke
index ea2030735f15a1406a6509b6b5e94e617e71dfde..dff318523c413dcfaf396ebb6aa8e1008888d53c 100755 (executable)
--- a/cgi-invoke
+++ b/cgi-invoke
@@ -1,11 +1,32 @@
 #!/bin/sh
+#
+# CGI program as provided to webserver
+# Takes out the lock, makes the cache directory if necessary.
+# Rather chiark-specific.  You might replace with-lock-ex with flock(1).
+
+# rrd-graphs/cgi-invoke - part of rrd-graphs, a tool for online graphs
+# Copyright 2010, 2012 Ian Jackson
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 set -e
 exec with-lock-ex -w data/graph-lock sh -ec '
        if ! test -d cache; then
                quicksand-setup ||:
-               mkdir $GRAPH_CGI_CACHE
+               if ! test -d $GRAPH_CGI_CACHE; then mkdir $GRAPH_CGI_CACHE; fi
                rm -f cache
                ln -s $GRAPH_CGI_CACHE cache
        fi
-       ./cgi "$@"
+       exec ./cgi "$@"
 ' x "$@"