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#!/bin/bash

# Copyright (C) 2011-2015 by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
#
# This programme is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This programme is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

export PATH="${HOME}/bin:${PATH}"

GIT_USER="gituser"
GIT_HOSTNAME="git.mydomain.org"

DEBEMAIL="firstname.lastname@mydomain.org"
DEBFULLNAME="Firstname Lastname"
GPG_KEY=""
DEB_DISTS_SUPPORTED="debian ubuntu"
DEBIAN_DISTROS="lenny,squeeze,wheezy,jessie,sid"
UBUNTU_DISTROS="lucid,precise"

COMPONENT_MAIN="main"
COMPONENT_NIGHTLY="nightly"
COMPONENT_BUNDLES="bundle-release1 bundle-release2"
REPOS_SERVER="packages.mydomain.org"
PACKAGES_WITHOUT_OTHERMIRROR="keyring"
GNUPGHOME="${HOME}/.gnupg"

test -z "${1}" && { echo "usage: $(basename "${0}") [<subpath>/]<git-project> {main,main/<codename>,nightly,nightly/<codename>} [<git-checkout>]"; exit 1; }

PREFIX="$(cut -d"-" -f1 <<< "$(basename "${0}")")"
test -f "${HOME}/.buildscripts/${PREFIX}.conf" && . "${HOME}/.buildscripts/${PREFIX}.conf" || { echo "${0} has no valid context prefix..." >&2; exit 1; }

: ${NO_DELAY:="no"}
: ${FORCE_BUILD:="no"}
: ${DEB_BUILD_FOR:="debian:${DEBIAN_DISTROS} ubuntu:${UBUNTU_DISTROS}"}

# These parts are not user-serviceable.
typeset -ag temp_cleanup=""
# End of non-user-serviceable part.

set -ex

# Cleans up temporary directories and files.
# RFC SHOULD be called by trap handlers.
cleanup () {
	typeset temp_dir=""
	for temp_dir in "${temp_cleanup[@]}"; do
		if [ -n "${temp_dir}" ] && [ -d "${temp_dir}" ]; then
			rm -Rf -- "${temp_dir}"
		fi
	done
}

# Run cleanup() automatically.
trap cleanup ERR EXIT SIGTERM SIGINT SIGHUP SIGPIPE SIGALRM SIGUSR1 SIGUSR2

set_vars() {
	USE_SUDO="yes"
	PDEBUILD="pdebuild --pbuilder qemubuilder"
	TEMP_BASE="${HOME}/tmp/"
	mkdir -p -- "${TEMP_BASE}"
	chmod 2770 "${TEMP_BASE}"

	# first argv is the name of the Git project
	PROJECT_PATH="${1}"
	PROJECT_PATH="${PROJECT_PATH/%.git/}"
	PROJECT="$(basename "${PROJECT_PATH}")"

	# grab repository component area from command line (2nd argv) or guess it
	ARGV2_COMPONENT="$(cut -d"/" -f1 <<< "${2}/")"
	ARGV2_CODENAME="$(cut -d"/" -f2 <<< "${2}/")"
	COMPONENT="${ARGV2_COMPONENT:-${COMPONENT:-$COMPONENT_NIGHTLY}}"
	CODENAMES="${ARGV2_CODENAME:-${CODENAMES}}"
	[ -n "${ARGV2_CODENAME}" ] && FORCE_BUILD="yes" || true
	DATE="${DATE:-$(date +%Y%m%d)}"
	if [ "x${COMPONENT}" = "x${COMPONENT_MAIN}" ]; then
		CHECKOUT="${3:-build-main}"
	elif [ "x${COMPONENT}" = "x${COMPONENT_MAIN}-test" ]; then
		CHECKOUT="${3:-build-main-test}"
	elif grep -qs "$COMPONENT" <<< "${COMPONENT_RELEASES}"; then
		CHECKOUT="${3:-build-$COMPONENT}"
	elif [ "x${COMPONENT}" = "x${COMPONENT_NIGHTLY}" ]; then
		CHECKOUT="${3:-master}"
	else
		echo "error: no such package component area for this Git project. Aborting..."
		exit 1
	fi
	# the DATE might be given as ,,today'' from the command line
	[ "x${DATE}" = "xtoday" ] && DATE="$(date +%Y%m%d)"

	# setting paths
	PROJECT_DIR="${HOME}/build/${COMPONENT}/${PROJECT}"
	PKGDIST="${HOME}/pkg-dist/${COMPONENT}/${PROJECT}"

	# build for other architectures than amd64/i386
	: ${EXTRA_ARCHS:=""}
	: ${EXTRA_ARCHS_ONLY:=""}

	# lock file
	LOCK_FILE="${PROJECT_DIR}/../.${PROJECT}.lock"

	# creating paths
	mkdir -p -- "${PROJECT_DIR}"
	mkdir -p -- "${PKGDIST}"

	return 0
}

prepare_workspace() {
	# make sure our local working copy is up to date...

	if [ -d "${PROJECT_DIR}/.git" ]; then
		cd "$PROJECT_DIR" && git reset --hard
		git checkout --force "${CHECKOUT}" || git checkout --force -b "${CHECKOUT}"
		git pull origin "${CHECKOUT}"
		git fetch origin upstream:upstream || true
		git fetch origin pristine-tar:pristine-tar || true
		# and again, get the ${CHECKOUT} refspec in pure state
		git reset --hard
		git clean -df
	else
		cd "$(dirname "${PROJECT_DIR}")"
		git clone "git://${GIT_HOSTNAME}/${PROJECT_PATH}.git"
		cd "${PROJECT}"
		git checkout --force "${CHECKOUT}" || git checkout --force -b "${CHECKOUT}"
		git fetch origin upstream:upstream
		git fetch origin pristine-tar:pristine-tar || true
		git clean -df
	fi

	GIT_OBJECT_ID="$(git rev-parse --verify HEAD)"
	cd "${PROJECT_DIR}"

	# by default we build for all current debian versions
	if [ "x${ARGV2_CODENAME}" != "x" ]; then
		if grep -qs "${ARGV2_CODENAME}" <<< "${DEBIAN_DISTROS}"; then
			DEB_BUILD_FOR="debian:${ARGV2_CODENAME}"
		elif grep -qs "${ARGV2_CODENAME}" <<< "${UBUNTU_DISTROS}"; then
			DEB_BUILD_FOR="ubuntu:${ARGV2_CODENAME}"
		fi
	fi
	return 0
}

clear_pkgdist() {
	# pkgdist directory cleanup

	# Do NOT spawn a subshell here.
	# Allow changing global variables in the main process.
	typeset -a deb_build_for_arr
	typeset OLDIFS="${IFS}"
	IFS=" "
	read -a deb_build_for_arr <<< "${DEB_BUILD_FOR}"
	IFS="${OLDIFS}"

	typeset line=""
	for line in "${deb_build_for_arr[@]}"; do
		l_DIST="$(cut -d":" -f1 <<< "${line/: /:}" | tr [:upper:] [:lower:])"
		l_CODENAMES="${CODENAMES:-$(cut -d":" -f2- <<< "${line/: /:}" | sed -e 's/,/ /g' | tr [:upper:] [:lower:])}"
		grep -qs "${l_DIST}" <<< "${DEB_DISTS_SUPPORTED}" && {
			for l_CODENAME in ${l_CODENAMES}; do

				# in case we build a special CODENAME (squeeze, wheezy, lucid, ...) do skip
				# the wrong distribution here...
				test -z "${CODENAMES}" || grep "${CODENAMES}" <<< "${line}" || break

				if [ "x${EXTRA_ARCHS_ONLY}" = "x" ]; then
					for l_ARCH in amd64 i386; do
						[ "x${SKIP_ARCH}" != "x${l_ARCH}" ] && {
							mkdir -p -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}"
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/dupload.conf"
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/${PROJECT}_"*.changes
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/${PROJECT}_"*.upload
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/${PROJECT}_"*.build
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/${PROJECT}_"*.dsc
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/${PROJECT}_"*.tar.gz
							rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}/"*.deb
						}
					done
				fi
				for l_EXTRA_ARCH in ${EXTRA_ARCHS}; do
					mkdir -p -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}"
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/dupload.conf"
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/${PROJECT}_"*.changes
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/${PROJECT}_"*.upload
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/${PROJECT}_"*.build
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/${PROJECT}_"*.dsc
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/${PROJECT}_"*.tar.gz
					rm -f -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}/"*.deb
				done
			done
		}
	done
	return 0
}

build_packages() {
	# use pbuilder for building all variants of this package

	# Do NOT spawn a subshell here.
	# Allow changing global variables in the main process.
	typeset -a deb_build_for_arr
	typeset OLDIFS="${IFS}"
	IFS=" "
	read -a deb_build_for_arr <<< "${DEB_BUILD_FOR}"
	IFS="${OLDIFS}"

	typeset line=""
	for line in "${deb_build_for_arr[@]}"; do
		l_DIST="$(cut -d":" -f1 <<< "${line/: /:}" | tr [:upper:] [:lower:])"
		l_CODENAMES="${CODENAMES:-$(cut -d":" -f2- <<< "${line/: /:}" | sed -e 's/,/ /g' | tr [:upper:] [:lower:])}"
		grep -qs "${l_DIST}" <<< "${DEB_DISTS_SUPPORTED}" && {
			for l_CODENAME in ${l_CODENAMES}; do

				# in case we build a special CODENAME (squeeze, wheezy, lucid, ...) do skip
				# the wrong distribution here...
				test -z "${CODENAMES}" || grep "${CODENAMES}" <<< "${line}" || break

				TEMP_DIR="$(mktemp -d --tmpdir=${TEMP_BASE})"
				temp_cleanup+=("${TEMP_DIR}")
				mkdir -p -- "${TEMP_DIR}/${PROJECT}"
				chmod 2770 -Rf -- "${TEMP_DIR}"

				cd "${PROJECT_DIR}"
				git clone "${PROJECT_DIR}" "${TEMP_DIR}/${PROJECT}/"
				cd "${TEMP_DIR}/${PROJECT}"
				git checkout "${CHECKOUT}" || git checkout master
				find "${PROJECT_DIR}/../" -type f -maxdepth 0 -mindepth 0 | grep -qs "${PROJECT}_"*.orig.tar.gz && cp -- "${PROJECT_DIR}/../${PROJECT}_"*.orig.tar.gz ..
				GITREV="$(gitrevno)"

				# we always build native packages for our repos
				SA_OPTION=""
				test -f "debian/source/format" && grep -Eqs '^3.0.*\(quilt\)$' "debian/source/format" && {
					git fetch origin upstream:upstream
					UPSTREAM_VERSION="$(dpkg-parsechangelog | grep "Version:" | cut -d " " -f2 | sed -e 's/-.*//' -e 's/^.*://')"
					REVISION="$(dpkg-parsechangelog | grep "Version:" | cut -d " " -f2 | sed -e 's/.*-//')"
					git archive --prefix="${PROJECT}-${UPSTREAM_VERSION}/" -o "../${PROJECT}_${UPSTREAM_VERSION}.orig.tar.gz" "upstream/${UPSTREAM_VERSION}" && {
						SA_OPTION="--debbuildopts=-sa"
					} || echo "1.0" > "debian/source/format"
				}

				# for Ubuntu version is the codename of the distribution release
				VERSION="${l_CODENAME}"

				# translate the version name for Debian releases
				[ "x${l_CODENAME}" = "xsid" ] && VERSION="unstable"
				#[ "x$l_CODENAME" = "xjessie" ] && VERSION=testing
				#[ "x$l_CODENAME" = "xwheezy" ] && VERSION=stable
				#[ "x$l_CODENAME" = "xoldstable" ] && VERSION=oldstable

				# modify the section for non-main package builds
				[ "x${COMPONENT}" != "xmain" ] && {
					mv -- "debian/control" "debian/control.tmp"
					sed "s,Section:[\ ]*\(.*\),Section: ${COMPONENT}/\1,g" debian/control.tmp > debian/control
				}

				# modify changelog for this build
				if [ "${COMPONENT}" != "${COMPONENT_NIGHTLY}" ]; then
					dch --distribution "${VERSION}" --force-distribution -l "+git${DATE}.${GITREV}+${l_CODENAME}.${COMPONENT}." "Auto-built ${l_DIST} ${l_CODENAME} package for ${REPOS_SERVER} repository (Git commit: ${GIT_OBJECT_ID})."
				else
					dch --distribution "${VERSION}" --force-distribution -l "~git${DATE}.${GITREV}+${l_CODENAME}.${COMPONENT}." "Development-Snapshot!!! Auto-built ${l_DIST} ${l_CODENAME} package for ${REPOS_SERVER} repository (Git commit: ${GIT_OBJECT_ID})."
				fi
				mkdir -p -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/"{amd64,i386}
				OTHERMIRROR=""
				if [ "x${COMPONENT}" = "x${COMPONENT_NIGHTLY}" ]; then
					grep -qs "${PROJECT}" <<< "${PACKAGE_WITHOUT_OTHERMIRROR}" || OTHERMIRROR="deb http://${REPOS_SERVER}/${l_DIST} ${l_CODENAME} ${COMPONENT_MAIN} ${COMPONENT}"
				else
					grep "${PROJECT}" <<< "${PACKAGE_WITHOUT_OTHERMIRROR}" || OTHERMIRROR="deb http://${REPOS_SERVER}/${l_DIST} ${l_CODENAME} ${COMPONENT}"
				fi
				# create git changelog immediately prior to building the package
				git --no-pager log --since "2 years ago" --format="%ai %aN (%h) %n%n%x09*%w(68,0,10) %s%d%n" > ChangeLog.gitlog

				[ "x${USE_SUDO}" != "xyes" ] && {
					[ "x${EXTRA_ARCHS_ONLY}" = "x" ] && {
						[ "x${SKIP_ARCH}" != "xamd64" ] && grep -Eqs 'Architecture.*(all|any|amd64)' "debian/control" && {
							DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="amd64" nice ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/amd64" -- --allow-untrusted ${SA_OPTION} 0<&-
						}
						[ "x${SKIP_ARCH}" != "xi386" ] && grep -Eqs 'Architecture.*(any|i386)' "debian/control" && {
							DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="i386" nice ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/i386" -- --binary-arch --allow-untrusted ${SA_OPTION} 0<&-
						}
					}
					for extra_arch in ${EXTRA_ARCHS}; do
						mkdir -p -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${extra_arch}"
						grep -Eqs "Architecture.*(any|$extra_arch)" "debian/control" && {
							DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="${extra_arch}" ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/${extra_arch}" -- --binary-arch --allow-untrusted ${SA_OPTION} 0<&-
						}
					done
				}
				[ "x${USE_SUDO}" = "xyes" ] && {
					[ "x${EXTRA_ARCHS_ONLY}" = "x" ] && {
						[ "x${SKIP_ARCH}" != "xamd64" ] && grep -Eqs 'Architecture.*(all|any|amd64)' "debian/control" && {
							nice sudo GNUPGHOME="${GNUPGHOME}" DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="amd64" OTHERMIRROR="${OTHERMIRROR}" ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/amd64" -- --allow-untrusted ${SA_OPTION} 0<&-
						}
						[ "x${SKIP_ARCH}" != "xi386" ] && grep -Eqs 'Architecture.*(any|i386)' "debian/control" && {
							nice sudo GNUPGHOME="${GNUPGHOME}" DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="i386" OTHERMIRROR="${OTHERMIRROR}" ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/i386" -- --binary-arch --allow-untrusted ${SA_OPTION} 0<&-
						}
					}
					for extra_arch in ${EXTRA_ARCHS}; do
						mkdir -p -- "${PKGDIST}/${l_DIST}/${l_CODENAME}/${extra_arch}"
						grep -Eqs "Architecture.*(any|$extra_arch)" "debian/control" && {
							nice sudo GNUPGHOME="${GNUPGHOME}" DIST="${l_DIST}" CODENAME="${l_CODENAME}" ARCH="${extra_arch}" OTHERMIRROR="${OTHERMIRROR}" ${PDEBUILD} --auto-debsign --debsign-k "${GPG_KEY}" --buildresult "${PKGDIST}/${l_DIST}/${l_CODENAME}/${extra_arch}" -- --binary-arch --allow-untrusted ${SA_OPTION} 0<&-
						}
					done
				}
			done
		}
	done
	return 0
}

upload_packages() {
	# dupload the new packages to the reprepro repository

	# Do NOT spawn a subshell here.
	# Allow changing global variables in the main process.
	typeset -a deb_build_for_arr
	typeset OLDIFS="${IFS}"
	IFS=" "
	read -a deb_build_for_arr <<< "${DEB_BUILD_FOR}"
	IFS="${OLDIFS}"

	typeset line=""
	for line in "${deb_build_for_arr[@]}"; do
		l_DIST="$(cut -d":" -f1 <<< "${line/: /:}" | tr [:upper:] [:lower:])"
		l_CODENAMES="${CODENAMES:-$(cut -d":" -f2- <<< "${line/: /:}" | sed -e 's/,/ /g' | tr [:upper:] [:lower:])}"
		for l_CODENAME in ${l_CODENAMES}; do

			# in case we build a special CODENAME (squeeze, wheezy, lucid, ...) do skip
			# the wrong distribution here...
			test -z "${CODENAMES}" || grep "${CODENAMES}" <<< "${line}" || break

			if [ "x${EXTRA_ARCHS_ONLY}" = "x" ]; then
				for l_ARCH in amd64 i386; do
					[ "x${SKIP_ARCH}" != "x${l_ARCH}" ] && {
						cd "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_ARCH}"
						test -f "./dupload.conf" || ln -s -- "${HOME}/.dupload.conf.${PREFIX}" "./dupload.conf"
						ls -- "${PROJECT}_"*.changes >/dev/null 2>&1 && dupload -c --to "${PREFIX}-${l_DIST}-${l_CODENAME}" "${PROJECT}_"*.changes 0<&-
					}
				done
			fi
			for l_EXTRA_ARCH in ${EXTRA_ARCHS}; do
				cd "${PKGDIST}/${l_DIST}/${l_CODENAME}/${l_EXTRA_ARCH}"
				test -f "./dupload.conf" || ln -s -- "${HOME}/.dupload.conf.${PREFIX}" "./dupload.conf"
				ls -- "${PROJECT}_"*.changes >/dev/null 2>&1 && dupload -c --to "${PREFIX}-${l_DIST}-${l_CODENAME}" "${PROJECT}_"*.changes 0<&-
			done
		done
	done
	return 0
}

wait_for_lock() {
	while [ -f "${LOCK_FILE}" ]; do
		pid="$(head -n1 "${LOCK_FILE}")"
		if ! ps "${pid}" 1>/dev/null; then
			rm -f -- "${LOCK_FILE}"
		else
			echo "PROJECT directory is locked, sleeping for 10 seconds..."
			sleep 10
		fi
	done
}

lock_workspace() {
	wait_for_lock

	echo "${$}" > "${LOCK_FILE}"
}

unlock_workspace() {
	rm -f -- "${LOCK_FILE}"
}

delay_build() {
	sleep $[ ( $RANDOM % 30 )  + 1 ]s
}

### MAIN ###
set_vars "$@" && {
	if [ "x$(basename "${0}")" = "x${PREFIX}-build-deb-package" ] || [ "x$(basename "${0}")" = "x${PREFIX}-build+upload-deb-package" ]; then
									# Treat any value other than "no" and "0" as true.
		cd "${PROJECT_DIR}" && pkgneedsbuild "${CHECKOUT}" || ( [ "x${FORCE_BUILD}" != "xno" ] && [ "x${FORCE_BUILD}" != "x0" ] ) && {
			if [ "x${FORCE_BUILD}" != "xno" ] && [ "x${FORCE_BUILD}" != "x0" ] && ( [ "x${NO_DELAY}" = "xno" ] || [ "x${NO_DELAY}" = "x0" ] ); then
				delay_build
			fi
			lock_workspace
			prepare_workspace && {
				unlock_workspace
				clear_pkgdist
				build_packages
			}
			unlock_workspace
		}
	fi
	if [ "x$(basename "${0}")" = "x${PREFIX}-upload-deb-package" ] || [ "x$(basename "${0}")" = "x${PREFIX}-build+upload-deb-package" ]; then
		upload_packages
	fi
}