#!/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>
#

remote="$1"
url="$2"

z40=0000000000000000000000000000000000000000

IFS=' '
while read local_ref local_sha remote_ref remote_sha
do
    case "$local_ref"::"$url" in
	refs/heads/master::*github.com*)
	    # Example: url = git@github.com:SOME-GITHUB-USER/gpb.git
	    d=`git describe --always --tags --match '[0-9]*.[0-9]*' $local_sha`
	    if ! (echo "$d" | egrep '^[0-9]+(\.[0-9]+)*$' >/dev/null)
	    then
		echo "ERROR: attempt to push non-n.m...-tagged version"
		echo "       on master ($local_ref)"
		echo "       to github: $d"
		exit 1
	    fi
	    ;;
    esac
done

exit 0
