#!/bin/sh
#
# An example hook script to verify what is about to be committed.
# Called by git-commit with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# To enable this hook, rename this file to "pre-commit".

# FIXME: too much crap in the overlay before we can enable this...
#if git-rev-parse --verify HEAD >/dev/null 2>&1
#then
#	against=HEAD
#else
#	# Initial commit: diff against an empty tree object
#	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
#fi
#
#exec git diff-index --check --cached $against --

find_manifest() {
	local f=$1 categ categ_rest pn package

	# if f is "x11-apps/xinit/files/startDM.sh"
	categ=${f%%/*}       # <= x11-apps
	categ_rest=${f#*/}   # <= xinit/files/startDM.sh
	pn=${categ_rest%%/*} # <= xinit
	package=$categ/$pn   # <= x11-apps/xinit

	[[ $categ == $categ_rest ]] && return 1
	[[ ! -d $categ ]] && return 1
	[[ ! -d $package ]] && return 1

	[[ -z "`ls $package/*.ebuild`" ]] && return 1

	echo $package
	return 0
}

#set -x

#
# list of files in the git index (which are about to be committed)
#
modified_files=$(git diff-index --name-only --cached HEAD --)

#
# get a list of directories that should contain Manifests
# based on the list of modified files
#
for f in $modified_files; do
	packages="$packages $(find_manifest $f)"
done
packages=$(echo $packages | sort | uniq)

#
# create a temp directory where the packages will be copied and checked
#
tempdir=$(mktemp -d)
git checkout-index -fa --prefix=${tempdir}/
git diff-index --cached --name-only --diff-filter=D -z HEAD | \
    (cd $tempdir && xargs -0 rm -f --)

#
# check Manifests
#
retval="0"
for package in $packages; do
	./scripts/digestcheck.py $tempdir/$package &> /dev/null
	if [[ $? -ne 0 ]]; then
		echo "Wrong Manifest in $package"
		retval="1"
	fi
done

#
# clean up
#
rm -fr "${tempdir}"

exit $retval