#!/bin/bash
# Not using -o pipefail, as SIGPIPE is annoying to deal with
set -eu
shopt -s nullglob

if [ "${BUILD_DIST+x}" != "x" ]; then
	echo "Not running in an OBS build container"
	exit 1
fi

BUILD_DATA="${BUILD_DIST/.dist/.data}"
if [ -e "${BUILD_DATA}" ]; then
	. "${BUILD_DATA}"

	# The build script renames the recipe (to strip _service:foo:), but doesn't update .data
	RECIPEFILE="${RECIPEFILE##*:}"

	if [ "${RECIPEFILE##*.}" != "kiwi" ] && [ "${RECIPEFILE}" != "Dockerfile" ] && [ "${RECIPEFILE}" != "Chart.yaml" ]; then
		echo "Recipe is neither Dockerfile, kiwi recipe nor helm chart - exiting"
		exit 0
	fi

	files=("${RECIPEFILE}")
else
	echo "Warning: No build data found - chroot build?"
	DISTURL="local"
	RELEASE=0

	# Guess the build recipe
	files=(*.kiwi Dockerfile* Chart.yaml*)
	if [ "${#files}" -eq 0 ]; then
		echo "No kiwi recipe, Dockerfile or helm chart found - exiting"
		exit 0
	fi
fi

# Print all rpm files which contain os-release
find_release_rpms() {
	find ./repos -name \*-release\*.rpm | while read rpm; do
		if rpm -qlp "${rpm}" | grep -qE '^(/etc/os-release|/usr/lib/os-release)$'; then
			echo "${rpm}"
		fi
	done
}

if grep -q "%OS_" ${files[@]}; then
	# Needs os-release, search for RPMs
	relpkgs=($(find_release_rpms))

	if [ ${#relpkgs[@]} -lt 1 ]; then
		echo "No release package found, but recipe uses %OS_*% placeholders"
		exit 1
	fi

	if [ ${#relpkgs[@]} -gt 1 ]; then
		echo "Multiple release packages found, don't know which os-release to use"
		exit 1
	fi

	# Extract the content
	tempdir=$(mktemp -d)
	trap "rm -r ${tempdir}" EXIT
	rpm2cpio "${relpkgs[0]}" | cpio -idD "${tempdir}"

	# And source it
	[ -f "${tempdir}/usr/lib/os-release" ] && . "${tempdir}/usr/lib/os-release"
	[ -f "${tempdir}/etc/os-release" ] && . "${tempdir}/etc/os-release"

	# Special case for SLE X "SP 0", make sure it has .0
	VERSION_ID_SP="${VERSION_ID}"
	[[ "${VERSION_ID_SP%}" == *"."* ]] || VERSION_ID_SP="${VERSION_ID}.0"

	sed -i"" \
	    -e "s/%OS_VERSION_ID%/${VERSION_ID}/g" \
	    -e "s/%OS_PRETTY_NAME%/${PRETTY_NAME}/g" \
	    -e "s/%OS_VERSION_ID_SP%/${VERSION_ID_SP}/g" "${files[@]}"
fi

sed -i"" \
    -e "s#%DISTURL%#${DISTURL}#g" \
    -e "s/%RELEASE%/${RELEASE}/g" \
    -e "s/%BUILDTIME%/$(date --utc +%FT%T.%NZ)/g" "${files[@]}"