#!/bin/ksh
# 2021-04-07 Olaf Bohlen <olbohlen@eenfach.de>
# 2021-11-30 Till Wegmueller <toasterson@gmail.com>
# instead of putting all this into the Jenkinsfile I decided to put the actual code in this script

set -ex

# global config
HTTPCONF="/etc/apache2/2.4/conf.d/pkgdepotd.conf"

# just run prepare once to initially set up the environment
# this must be run as root
prepare() {
	echo "jenkinshelper: preparing..."
	pkg install web/server/apache-24
	mkdir -p /etc/apache2/2.4/conf.d && chown root:sys /etc/apache2/2.4/conf.d
	grep "#ProxyPassMatch /default/(.*)\$ http://127.0.0.1:10000/\$1 nocanon max=200" "${HTTPCONF}" >/dev/null 2>&1
	if [ $? -gt 0 ]; then
		echo "jenkinshelper: Initializing a new apache config at ${HTTPCONF}"
		echo "#ProxyPassMatch /default/(.*)\$ http://127.0.0.1:10000/\$1 nocanon max=200" >"${HTTPCONF}"
	else
		echo "jenkinshelper: Preserving an existing ${HTTPCONF}"
	fi

	cat >/etc/apache2/2.4/conf.d/00-proxy.conf <<EOF
LoadModule proxy_module libexec/mod_proxy.so
LoadModule proxy_connect_module libexec/mod_proxy_connect.so
LoadModule proxy_ftp_module libexec/mod_proxy_ftp.so
LoadModule proxy_http_module libexec/mod_proxy_http.so
LoadModule proxy_ajp_module libexec/mod_proxy_ajp.so

ProxyRequests Off
ProxyVia Off
ProxyPreserveHost on
RequestHeader unset Origin
AllowEncodedSlashes NoDecode
EOF

	chown root:builders "${HTTPCONF}"
	chmod 664 "${HTTPCONF}"
	svcadm enable svc:/network/http:apache24
}

# setup oi-userland
stage_setup() {
	if [ ! -f /etc/apache2/2.4/conf.d/00-proxy.conf ]; then
		echo "jenkinshelper: aborting, please run \"jenkinshelper -p\" initially as root on this jenkins instance once"
		exit 1
	fi
	echo "jenkinshelper: running gmake setup"
	gmake setup
}

# scan the git log for changed components
# we try to be smart and assume that all updates will always touch
# the components Makefile also (to update COMPONENT_REVISION, etc)
stage_build_changed() {
	echo "Last successful commit $1"
	worst=0
	for f in $(cat changed_files.txt | grep Makefile; exit 0); do
		echo "jenkinshelper: building for ${f%/*}..."
		curpwd=$(pwd)
		cd "${f%/*}" && COMPONENT_BUILD_ARGS=-j$(psrinfo -t -c) gmake publish
		rc=$?
		cd "${curpwd}"
		echo "jenkinshelper: done with ${f%/*} return code ${rc}"
		if [ rc -ne 0 ] ; then
			worst=$rc
		fi
	done
	return $worst
}

# prepare the pkg.depotd server instance, if an instance already
# exists for this branch, we will use that - otherwise create a
# fresh one
stage_prepare_pkgdepotd() {
	# we need the platform for the path to the repo
	platform=$(uname -p)

	# check if we already have this branch set up as a pkg.depotd:
	if ! svcs "pkg/server:${BRANCH_NAME}" >/dev/null 2>&1; then

		# get highest port from ${HTTPCONF} to figure out the next free one
		nextport=$(($(nawk -F '[/:]' '{ print $7 }' <"${HTTPCONF}" | sort -n | tail -1) + 1))

		# set-up a new pkg/server instance
		svccfg -s pkg/server <<EOF
add ${BRANCH_NAME}
select ${BRANCH_NAME}
addpg pkg application
setprop pkg/port=${nextport}
setprop pkg/readonly=true
setprop pkg/pkg_root=/
setprop pkg/inst_root=${WORKSPACE}/${platform}/repo
setprop pkg/proxy_base=${JENKINS_URL%:[0-9]*/}/${BRANCH_NAME}/
end
EOF

		# enable the new pkg/server instance
		svcadm enable pkg/server:${BRANCH_NAME}

		# add the new proxy rule to our apache config
		echo "ProxyPassMatch /${BRANCH_NAME}/(.*)\$ http://127.0.0.1:${nextport}/\$1 nocanon max=200" >>"${HTTPCONF}"

	fi

	# we need to refresh the repo:
	pkgrepo refresh -s ${WORKSPACE}/${platform}/repo

	# also restarting pkg.depotd does not hurt
	svcadm restart pkg/server:${BRANCH_NAME}

	# graceful restart apache to reload config
	svcadm refresh svc:/network/http:apache24
}

# cleanup the pkg.depotd server instance
stage_cleanup_pr() {
	# we need the platform for the path to the repo
	platform=$(uname -p)

	if ! "svcs pkg/server:${BRANCH_NAME}" >/dev/null 2>&1; then
		# disable the instance
		svcadm disable pkg/server:${BRANCH_NAME}

		# svcadm is a async operation thus sleep here
		sleep 1

		# remove instance from SMF
		svccfg delete pkg/server:${BRANCH_NAME}

		# Remove apache port
		sed "/^ProxyPassMatch /${BRANCH_NAME}/d"

		# graceful restart apache to reload config
		svcadm refresh svc:/network/http:apache24
	fi
}

usage() {
	cat <<EOF
Usage:
jenkinshelper.ksh [ -h | -p | -s <stage> ]
		  -h    show this help
		  -p    run only ONCE to initialize your environment
		  -s    followed by the stage to run, currently:
		        setup, build_changed, prepare_pkgdepotd
EOF
	exit 0
}

## MAIN ##
# call this script with the stage as an argument to -s

while getopts s:hp argv; do
	case ${argv} in
	s) stage="stage_${OPTARG}" ;;
	p) stage="prepare" ;;
	h) usage ;;
	esac
done
shift $(expr ${OPTIND} - 1)

# run requested stage
rt=0
${stage} || rt=$?

# we are done
exit ${rt}