Rename sys.config to sys.config.orig

The purpose of this change is twofold.  Firstly, this makes sure that
the user chooses an appropriate configuration.  Secondly, this separates
the configuration file currently used from the one in version control,
removing the risk that temporary local changes get committed
unintentionally.

This closes #242.

Author: legoscia

.gitignore

@@ -1,4 +1,6 @@
 /rel/linc/
+# sys.config.orig is version controlled; sys.config is installation specific.
+/rel/files/sys.config
 /apps/*/ebin/
 /apps/*/.eunit/
 /apps/*/doc/

rel/files/sys.config rel/files/sys.config.origrel/files/sys.config renamed to rel/files/sys.config.orig

@@ -0,0 +1,15 @@
+%% -*- erlang -*-
+{pre_hooks,
+ [{generate,
+   "sh -c 'test -f files/sys.config || (echo "
+   "\"The configuration file rel/files/sys.config does not exist.\n"
+   "You can create it in two ways:\n"
+   "\n"
+   "1. Either run scripts/config_gen with appropriate arguments\n"
+   "   and save its output in rel/files/sys.config,\n"
+   "\n"
+   "2. Or copy rel/files/sys.config.orig to rel/files/sys.config\n"
+   "   and edit it by hand to fit your setup.\n"
+   "\n"
+   "Then run \\\"make rel\\\" again.\n\"; exit 1)'"
+  }]}.