"sudo" adc

The sudo adc should make life easier for any admin wishing to run an adc
as some other user.

As a result, the rmrepo adc also goes back to its simple roots.  Now you
just run it via the sudo adc if you (as gitolite admin) needs to rmrepo
some user's repo.

contrib/adc/sudo

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# this command is pretty cool, even if I may say so myself :)
+
+# for any ADC that a normal user can run, like
+
+#       ssh git@server adc arguments
+
+# this adc lets a "super user" (defined as "have write access to the
+# gitolite-admin repo"), do this
+
+#       ssh git@server sudo normal_user adc arguments
+
+. $(dirname $0)/adc.common-functions
+
+get_rights_and_owner gitolite-admin
+[ -z "$perm_write" ] && die "just *what* are you trying to pull, young man?"
+
+user="$1"; shift
+cmd="$1"; shift
+
+GL_USER=$user; export GL_USER
+exec $(dirname $0)/$cmd "$@"