Add pre-push hook to disable pushing to upstream

By default developers should not be able to push to upstream repo unless
they manually remove this hook. This is to prevent accidental pushes.

Author: zidarsk8

git_hooks/pre-push

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# An example hook script to verify what is about to be pushed.  Called by "git
+# push" after it has checked the remote status, but before anything has been
+# pushed.  If this script exits with a non-zero status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local sha1> <remote ref> <remote sha1>
+#
+# This sample shows how to prevent push of commits where the log message starts
+# with "WIP" (work in progress).
+
+remote="$1"
+url="$2"
+
+forbidden="google"
+
+if test "${url#*$forbidden}" != "$url"; then
+  echo "Pushing to $forbidden is disabled by default. If you need to push to"
+  echo "that repo please edit the pre-post git hook."
+  exit 1
+fi
+
+exit 0