#!/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"
do_syntaxcheck=0

# This script executes at the top of the git tree.  Try to find the
# build directory... but ignore jitter's.
builddir=$(dirname "`find . -name config.log | grep -v jitter | head -1`")
cd $builddir

z40=0000000000000000000000000000000000000000

while read local_ref local_sha remote_ref remote_sha
do
	if [ "$local_sha" = $z40 ]
	then
		# Handle delete
		:
	else
		if [ "$remote_sha" = $z40 ]
		then
			# New branch, examine all commits
			range="$local_sha"
		else
			# Without this check, the "git diff-tree" below fails and
			# this hook falsely reports "ChangeLog is missing." when the
			# remote has unfetched commits.
			if test $(git cat-file -t $remote_sha^{commit})
			then
				# Update to existing branch, examine new commits
				range="$remote_sha..$local_sha"
			else
				echo "Remote contains unfetched commits"
				exit 1
			fi
		fi

		# Check for ChangeLog being in each commits
		changelog=`git diff-tree --no-commit-id --name-only -r "$range" | grep '^ChangeLog$'`
		if [ -z "$changelog" ]; then
			echo >&2 "ChangeLog is missing."
			exit 1
		fi

		# Check for WIP commit
		commit=`git rev-list -n 1 --grep '^WIP' "$range"`
		if [ -n "$commit" ]
		then
			echo >&2 "Found WIP commit in $local_ref, not pushing"
			exit 1
		fi

		do_syntaxcheck=1
	fi
done

if [ $do_syntaxcheck != 0 ]; then
	echo "Checking syntax... "
	out=`make syntax-check`
	if test $? != 0; then
		(
		echo "$out" | grep ':'
		echo
		echo "*** Syntax check needs to succeed before pushing is allowed."
		) >&2
		exit 1
	fi
fi

exit 0
