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#!/bin/bash

# Copyright 2015-2017 Holger Levsen <holger@layer-acht.org>
#                2017 kpcyrd <git@rxv.cc>
# released under the GPLv=2

DEBUG=false
. /srv/jenkins/bin/common-functions.sh
common_init "$@"

# common code
. /srv/jenkins/bin/reproducible_common.sh

set -e

cleanup_all() {
	cd
	# delete session if it still exists
	if [ "$MODE" != "master" ] ; then
		schroot --end-session -c archlinux-$SRCPACKAGE-$(basename $TMPDIR) > /dev/null 2>&1 || true
	fi
	# delete makepkg build dir
	if [ ! -z $SRCPACKAGE ] && [ -d /tmp/$SRCPACKAGE-$(basename $TMPDIR) ] ; then
		rm -r /tmp/$SRCPACKAGE-$(basename $TMPDIR)
	fi
	# delete main work dir (only on master)
	if [ "$MODE" = "master" ] ; then
		rm $TMPDIR -r
		echo "$(date -u) - $TMPDIR deleted."
	fi
	rm -f $DUMMY > /dev/null || true
}

handle_remote_error() {
	MESSAGE="${BUILD_URL}console got remote error $1"
	echo "$(date -u ) - $MESSAGE" | tee -a /var/log/jenkins/reproducible-remote-error.log
	echo "Sleeping 5m before aborting the job."
	sleep 5m
	cleanup_all
	exec /srv/jenkins/bin/abort.sh
	exit 0
}

update_archlinux_repositories() {
	# every 2 days we check for new archlinux packages in all tested repositories
	touch -d "$(date -d '2 days ago' '+%Y-%m-%d') 00:00 UTC" $DUMMY
	local NEED_UPDATE=false
	local REPO
	for REPO in $ARCHLINUX_REPOS ; do
		if [ ! -f ${ARCHLINUX_PKGS}_$REPO ] || [ $DUMMY -nt ${ARCHLINUX_PKGS}_$REPO ] ; then
			NEED_UPDATE=true
		fi
	done
	if $NEED_UPDATE ; then
		local SESSION="archlinux-scheduler-$RANDOM"
		schroot --begin-session --session-name=$SESSION -c jenkins-reproducible-archlinux
		schroot --run-session -c $SESSION --directory /var/tmp -- sudo pacman -Syu --noconfirm
		# Get a list of unique package bases.  Non-split packages don't have a pkgbase set
		# so we need to use the pkgname for them instead.
		schroot --run-session -c $SESSION --directory /var/tmp -- expac -S '%r %e %n' | \
			while read repo pkgbase pkgname; do
				if [[ "$pkgbase" = "(null)" ]]; then
					printf '%s %s\n' "$repo" "$pkgname"
				else
					printf '%s %s\n' "$repo" "$pkgbase"
				fi
			done | sort -u > "$ARCHLINUX_PKGS"_full_pkgbase_list

		for REPO in $ARCHLINUX_REPOS ; do
			echo "$(date -u ) - updating list of available packages in repository '$REPO'."
			grep "^$REPO" "$ARCHLINUX_PKGS"_full_pkgbase_list | \
				while read repo pkgbase; do
					printf '%s\n' "$pkgbase"
				done > "$ARCHLINUX_PKGS"_"$REPO"
			echo "$(date -u ) - these packages in repository '$REPO' are known to us:"
			cat ${ARCHLINUX_PKGS}_$REPO
		done
		rm "$ARCHLINUX_PKGS"_full_pkgbase_list
		schroot --end-session -c $SESSION
	else
		echo "$(date -u ) - repositories recent enough, no update needed."
	fi
	rm $DUMMY > /dev/null
}

choose_package() {
	echo "$(date -u ) - choosing package to be build."
	update_archlinux_repositories
	local REPO
	local PKG
	for REPO in $(echo $ARCHLINUX_REPOS | sed -s "s# #\n#g" | sort -R | xargs echo ); do
		case $REPO in
			core)		MIN_AGE=7
					;;
			extra|multilib)	MIN_AGE=28
					;;
			community)	MIN_AGE=42
					;;
			*)		MIN_AGE=365	# should never happen…
					;;
		esac
		touch -d "$(date -d "$MIN_AGE days ago" '+%Y-%m-%d') 00:00 UTC" $DUMMY
		for PKG in $(cat ${ARCHLINUX_PKGS}_$REPO | sed -s "s# #\n#g" | sort -R | xargs echo ) ; do
			# build package if it has never build or at least $MIN_AGE days ago
			if [ ! -d $BASE/archlinux/$REPO/$PKG ] || [ $DUMMY -nt $BASE/archlinux/$REPO/$PKG ] ; then
				REPOSITORY=$REPO
				SRCPACKAGE=$PKG
				echo "$(date -u ) - building package $PKG from '$REPOSITORY' now..."
				# very simple locking…
				mkdir -p $BASE/archlinux/$REPOSITORY/$PKG
				touch $BASE/archlinux/$REPOSITORY/$PKG
				# break out of the loop (and then out of the next loop too...)
				break
			fi
		done
		# if we broke out of the previous loop we have choosen a package
		if [ ! -z "$SRCPACKAGE" ] ; then
			break
		fi
	done
	rm $DUMMY > /dev/null
	if [ -z $SRCPACKAGE ] ; then
		echo "$(date -u ) - no package found to be build, sleeping 6h."
		for i in $(seq 1 12) ; do
			sleep 30m
			echo "$(date -u ) - still sleeping..."
		done
		echo "$(date -u ) - exiting cleanly now."
		exit 0
	fi
}

first_build() {
	echo "============================================================================="
	echo "Building for Arch Linux on $(hostname -f) now."
	echo "Source package: ${SRCPACKAGE}"
	echo "Repository:     $REPOSITORY"
	echo "Date:           $(date -u)"
	echo "============================================================================="
	set -x
	local SESSION="archlinux-$SRCPACKAGE-$(basename $TMPDIR)"
	local BUILDDIR="/tmp/$SRCPACKAGE-$(basename $TMPDIR)"
	local LOG=$TMPDIR/b1/$SRCPACKAGE/build1.log
	schroot --begin-session --session-name=$SESSION -c jenkins-reproducible-archlinux
	echo "MAKEFLAGS=-j$NUM_CPU" | schroot --run-session -c $SESSION --directory /tmp -u root -- tee -a /etc/makepkg.conf
	schroot --run-session -c $SESSION --directory /tmp -- mkdir $BUILDDIR
	schroot --run-session -c $SESSION --directory "$BUILDDIR" -- env GIT_SSL_NO_VERIFY=1 asp checkout "$SRCPACKAGE"
	# $SRCPACKAGE is actually the binary package
	ACTUAL_SRCPACKAGE=$(ls "$BUILDDIR")
	# just set timezone in the 1st build
	echo 'export TZ="/usr/share/zoneinfo/Etc/GMT+12"' | schroot --run-session -c $SESSION --directory /tmp -- tee -a /var/lib/jenkins/.bashrc
	# nicely run makepkg with a timeout of $TIMEOUT hours
	timeout -k $TIMEOUT.1h ${TIMEOUT}h /usr/bin/ionice -c 3 /usr/bin/nice \
		schroot --run-session -c $SESSION --directory "$BUILDDIR/$ACTUAL_SRCPACKAGE/trunk" -- bash -l -c 'SOURCE_DATE_EPOCH='$SOURCE_DATE_EPOCH' makepkg --syncdeps --noconfirm 2>&1' | tee -a $LOG
	PRESULT=${PIPESTATUS[0]}
	if [ $PRESULT -eq 124 ] ; then
		echo "$(date -u) - makepkg was killed by timeout after ${TIMEOUT}h." | tee -a $LOG
	fi
	schroot --end-session -c $SESSION | tee -a $LOG
	PRESULT=${PIPESTATUS[0]}
	if [ $PRESULT -ne 0 ] ; then
		echo "$(date -u) - could not end schroot session, maybe some processes are still running? Sleeping 60 seconds and trying again…" | tee -a $LOG
		sleep 60
		schroot --end-session -f -c $SESSION | tee -a $LOG
		P2RESULT=${PIPESTATUS[0]}
		if [ $P2RESULT -ne 0 ] ; then
			echo "$(date -u) - could not end schroot session even with force. Sleeping 10 seconds and trying once more…" | tee -a $LOG
			sleep 10
			schroot --end-session -f -c $SESSION | tee -a $LOG
			P3RESULT=${PIPESTATUS[0]}
			if [ $P3RESULT -ne 0 ] ; then
				if [ -n "$(grep 'ERROR: One or more PGP signatures could not be verified' $LOG)" ] ; then
					# abort only
					exit 42
				else
					# fail with notification
					exit 23
				fi
			fi
		fi
	fi
	if ! "$DEBUG" ; then set +x ; fi
}

second_build() {
	echo "============================================================================="
	echo "Re-Building for Arch Linux on $(hostname -f) now."
	echo "Source package: ${SRCPACKAGE}"
	echo "Repository:     $REPOSITORY"
	echo "Date:           $(date -u)"
	echo "============================================================================="
	set -x
	local SESSION="archlinux-$SRCPACKAGE-$(basename $TMPDIR)"
	local BUILDDIR="/tmp/$SRCPACKAGE-$(basename $TMPDIR)"
	local LOG=$TMPDIR/b2/$SRCPACKAGE/build2.log
	NEW_NUM_CPU=$(echo $NUM_CPU-1|bc)
	schroot --begin-session --session-name=$SESSION -c jenkins-reproducible-archlinux
	echo "MAKEFLAGS=-j$NEW_NUM_CPU" | schroot --run-session -c $SESSION --directory /tmp -u root -- tee -a /etc/makepkg.conf
	schroot --run-session -c $SESSION --directory /tmp -- mkdir $BUILDDIR
	schroot --run-session -c $SESSION --directory "$BUILDDIR" -- env GIT_SSL_NO_VERIFY=1 asp checkout "$SRCPACKAGE"
	# $SRCPACKAGE is actually the binary package
	ACTUAL_SRCPACKAGE=$(ls "$BUILDDIR")
	# add more variations in the 2nd build: TZ, LANG, LC_ALL, umask
	schroot --run-session -c $SESSION --directory /tmp -- tee -a /var/lib/jenkins/.bashrc <<-__END__
	export TZ="/usr/share/zoneinfo/Etc/GMT-14"
	export LANG="fr_CH.UTF-8"
	export LC_ALL="fr_CH.UTF-8"
	umask 0002
	__END__
	# nicely run makepkg with a timeout of $TIMEOUT hours
	timeout -k $TIMEOUT.1h ${TIMEOUT}h /usr/bin/ionice -c