#! /bin/bash -e
set -o errtrace

# build and test everything in a fresh docker installation
myarch=$(dpkg --print-architecture)
if test "${arch}" = "amd64"; then
    myarch="amd64|i386"
fi
mode=
img=
repos=()
keys=()
dns=()
envs=("-e LANG=${LANG}" "-e HOME=${HOME}" "-e TERM=xterm" "-e DEBIAN_FRONTEND=noninteractive" "-e DEBCONF_NONINTERACTIVE_SEEN=true")
dirs=("-v $(pwd):/workdir" "-v ${HOME}/.gnupg:${HOME}/.gnupg")
packages=()
targets="all check distcheck"
commands=()
arch=$((which dpkg > /dev/null 2> /dev/null && dpkg --print-architecture) || echo amd64)
host=
flags=()
wait=0
commit=
nopull=0
prepare=0
clean=
if test -e ./build-in-docker.conf; then
    # you can preconfigure the variables in file build-in-docker.conf
    # if you do so, add the file to EXTRA_DIST in makefile.am
    source ./build-in-docker.conf
fi

while test $# -gt 0; do
    case "$1" in
        (-h|--help) cat <<EOF
SYNOPSIS

  $0 [OPTIONS]

OPTIONS

  -h, --help            show this help
  -m, --mode <type>     mode: deb, rpm, win, default: ${mode}
  -i, --image <image>   use given docker image instead of ${img}
  -a, --arch <arch>     build for given hardware architecture
  -t, --targets targets specify build targets, default: ${targets}
  --host <target-arch>  host for cross compiling, e.g. i686-w64-mingw32
  -f, --flag <flag>     add flag to ./bootstrap.sh or ./configure
  -r, --repo <url>      add given apt repository
  -k, --key <url>       add public key from url
  -n, --dns <ip>        add ip as dns server
  -e, --env <var>=<val> set environment variable in docker
  -d, --dir <dir>       access given directory read only
  -p, --package <pkg>   install extra debian packages
  -c, --cmd <command>   execute commands as root in docker
  -w, --wait            on error keep docker container and wait for enter
  --clean               run maintainer-clean before build
  --commit <image>      commit the container as image after setup, then exit
  --no-pull             do not pull image before start (use local image)
  --prepare             only prepare the image, then wait

  The option -i must be after -m, because mode sets a new default image
  The option -m must be after -t, because mode may be auto detected from targets
  The option -m must be after -h, because mode may set a host
  If target is either deb or rpm, mode is set to the same value
  If target is win, host is set to i686-w64-mingw32

  The options -r -k -e -d -p -c can be repeated several times.

  The options -r -p -c allow an if-then-else contruct
  depending on the operating system:
    <os>:::<A>:::<B>
    <os>:::<A>
  Read as: On linux type <os> use <A> else use <B>
  That means: If the distributer ID or codename in lsb_release
  matches regular expression <os>, then <A> is replaced, else <B> is replaced.
  The three colons are for splitting <os> from <A> and <B> part.
  E.g.: Install package curl on wheezy and npm on olter systems:
    $0 -p Debian|precise:::curl:::npm

PERFORMANCE

  Each build starts with an empty image and first installs all
  dependencies. You can speed up the build process by using an image,
  where all dependencies are already installed. The disadvantage of
  this approach is, that missing dependencies are not detected, so
  installing all dependencies into an empty image is a test for the
  dependency specification.

  Create an image from ubuntu:trusty that contains all dependencies:

    $0 -i ubuntu:trusty --tag my/trusty

  Now you can use the image my/trusty, but since it is not stored in a
  repository, you have to either push it to a repository (here my is
  your name in docker hub), or simply use it local only and add the
  flag --no-pull:

    $0 -i my/trusty -t all

  As long as you work with my/trusty, the dependencies don't need to
  be donwloaded in each build.

TESTING

  When you want to experiment with your builds, i.e. to trace a build
  problem, then option --prepare comes handy. It just starts an image
  with all dependencies, then waits and gives you information on how
  you can enter the image for manual tests in a temporary
  container. As soon as you hit the enter key, it cleans up the
  temporary container.

    $0 -i ubuntu:trusty --prepare

EXAMPLE

  $0 -i mwaeckerlin/ubuntu:trusty-i386 \\
                     -t deb \\
                     -e ANDROID_HOME=/opt/local/android \\
                     -d /opt/local/android \\
                     -r universe \\
                     -r https://repository.mrw.sh \\
                     -k https://repository.mrw.sh/PublicKey \\
                     -p mrw-c++

EOF
            exit 0
            ;;
        (-m|--mode)
            shift;
            mode="$1"
            if test -z "$img"; then
                case "$mode" in
                    (deb|apt) img="mwaeckerlin/debbuildenv";;
                    (rpm|zypper) img="opensuse:latest";;
                    (yum) img="centos:latest";;
                    (dnf) img="fedora:latest";;
                    (win)
                        img="mwaeckerlin/debbuildenv"; host="${host:---host=i686-w64-mingw32}"
                        targets="all install"
                        flags+=("--prefix=/workdir/usr")
                        packages+=("mingw-w64")
                        ;;
                    (*)
                        echo "**** ERROR: unknown mode '$1', try --help" 1>&2
                        exit 1
                        ;;
                esac
            fi
            ;;
        (-i|--image) shift;
            img="$1"
            ;;
        (-a|--arch) shift;
            arch="$1"
            ;;
        (-t|--targets) shift;
            targets="$1"
            if test "$1" = "deb" -o "$1" = "rpm"; then
                # set mode to same value
                set -- "-m" "$@"
                continue
            fi
            ;;
        (--host) shift;
            host="--host=$1"
            ;;
        (-f|--flag) shift;
            flags+=("$1")
            ;;
        (-r|--repo) shift;
            echo "OPTION: $1"
            repos+=("$1")
            ;;
        (-k|--key) shift;
            keys+=("$1")
            ;;
        (-e|--env) shift;
            envs+=("-e $1")
            ;;
        (-n|--dns) shift;
            dns+=("--dns $1")
            ;;
        (-d|--dirs) shift;
            dirs+=("-v $1:$1:ro")
            ;;
        (-p|--package) shift;
            packages+=("$1")
            ;;
        (-c|--cmd) shift;
            commands+=("$1")
            ;;
        (-w|--wait)
            wait=1
            ;;
        (--clean)
            clean="--clean -c"
            ;;
        (--commit) shift;
            commit="$1"
            ;;
        (--no-pull)
            nopull=1
            ;;
        (--prepare)
            prepare=1
            ;;
        (*)
            echo "**** ERROR: unknown option '$1', try --help" 1>&2
            exit 1
            ;;
    esac
    if test $# -eq 0; then
        echo "**** ERROR: missing value, try --help" 2>61
        exit 1
    fi
    shift
done

function waitforinput() {
    set +x
    echo "  ... now you can access the docker container as root or user:"
    echo "      docker exec -it ${DOCKER_ID} bash"
    echo "      docker exec -u $(id -u) -it ${DOCKER_ID} bash"
    echo -n "  ... press enter to cleanup: "
    read
}

function traperror() {
    set +x
    local DOCKER_ID="$1"
    local err=($2) # error status
    local line="$3" # LINENO
    local linecallfunc="$4" 
    local command="$5"
    local funcstack="$6"
    for e in ${err[@]}; do
        if test -n "$e" -a "$e" != "0"; then
            echo "<---"
            echo "ERROR: line $line - command '$command' exited with status: $e (${err[@]})"
            if [ "${funcstack}" != "main" -o "$linecallfunc" != "0" ]; then
                echo -n "   ... Error at ${funcstack} "
                if [ "$linecallfunc" != "" ]; then
                    echo -n "called at line $linecallfunc"
                fi
                echo
            fi
            if [ "$wait" -eq 1 ]; then
                waitforinput
            fi
            echo -n "   ... cleanup docker: "
            docker stop "${DOCKER_ID}" || true
            docker rm "${DOCKER_ID}"
            echo "returning status: $e"
            echo "--->"
            exit $e
        fi
    done
    echo -n "SUCCESS ... cleanup docker: "
    docker rm -f "${DOCKER_ID}"
    exit 0
}

function ifthenelse() {
    arg="$1"
    shift
    cmd="$*"
    DISTRIBUTOR=$(docker exec ${DOCKER_ID} lsb_release -si | sed 's, .*,,;s,.*,\L&,g')
    CODENAME=$(docker exec ${DOCKER_ID} lsb_release -cs)
    ARCH=$((docker exec ${DOCKER_ID} which dpkg > /dev/null 2> /dev/null && docker exec ${DOCKER_ID} dpkg --print-architecture) || echo amd64)
    case "$DISTRIBUTOR" in
        (opensuse) # code name may be not available, then set leap or tumbleweed
            if test "$CODENAME" = "n/a"; then
                CODENAME=$(docker exec ${DOCKER_ID} lsb_release -ds | sed "s,\($(docker exec ${DOCKER_ID} lsb_release -si | sed 's, ,\\|,g')\) *,,"';s, .*,,g;s,",,g;s,.*,\L&,g')
            fi
            ;;
        (fedora|mageia) # numeric code name
            CODENAME=$(docker exec ${DOCKER_ID} lsb_release -rs)
            ;;
        (centos) # only look at major number in centos
            CODENAME=$(docker exec ${DOCKER_ID} lsb_release -rs | sed 's,\..*,,')
            ;;
    esac
    if test "${arg/:::/}" = "${arg}"; then
        cmd_tmp="${cmd//ARG/${arg//@DISTRIBUTOR@/${DISTRIBUTOR}}}"
        docker exec ${DOCKER_ID} bash -c "${cmd_tmp//@CODENAME@/${CODENAME}}"
    else
        os="${arg%%:::*}"
        thenpart="${arg#*:::}"
        elsepart=
        if test "${thenpart/:::/}" != "${thenpart}"; then
            elsepart="${thenpart##*:::}"
            thenpart="${thenpart%%:::*}"
        fi
        if [[ "${DISTRIBUTOR}-${CODENAME}-${ARCH}" =~ ${os} ]]; then
            if test -n "${thenpart}"; then
                cmd_tmp="${cmd//ARG/${thenpart//@DISTRIBUTOR@/${DISTRIBUTOR}}}"
                docker exec ${DOCKER_ID} bash -c "${cmd_tmp//@CODENAME@/${CODENAME}}"
            fi
        else
            if test -n "${elsepart}"; then
                cmd_tmp="${cmd//ARG/${elsepart//@DISTRIBUTOR@/${DISTRIBUTOR}}}"
                docker exec ${DOCKER_ID} bash -c "${cmd_tmp//@CODENAME@/${CODENAME}}"
            fi
        fi
    fi
}

set -x

if test -z "$img"; then
    img="mwaeckerlin/debbuildenv"
fi
test $nopull -eq 1 || docker pull $img
DOCKER_ID=$(docker create ${dns[@]} ${dirs[@]} ${envs[@]} -w /workdir $img sleep infinity)
trap 'traperror '"${DOCKER_ID}"' "$? ${PIPESTATUS[@]}" $LINENO $BASH_LINENO "$BASH_COMMAND" "${FUNCNAME[@]}" "${FUNCTION}"' SIGINT INT TERM EXIT
if ! [[ $arch =~ $myarch ]]; then
    docker cp "/usr/bin/qemu-${arch}-static" "${DOCKER_ID}:/usr/bin/qemu-${arch}-static"
fi
docker start "${DOCKER_ID}"
if ! docker exec ${DOCKER_ID} getent group $(id -g) > /dev/null 2>&1; then
    docker exec ${DOCKER_ID} groupadd -g $(id -g) $(id -gn)
fi
if ! docker exec ${DOCKER_ID} getent passwd $(id -u) > /dev/null 2>&1; then
    docker exec ${DOCKER_ID} useradd -m -u $(id -u) -g $(id -g) -d"${HOME}" $(id -un)
fi
docker exec ${DOCKER_ID} chown $(id -u):$(id -g) "${HOME}"
if test -z "$mode"; then
    case "$targets" in
        (*deb*) mode=deb;;
        (*rpm*) mode=rpm;;
        (*) case "$img" in
                (*deb*|*ubuntu*|*debian*|*mint*) mode=deb;;
                (*rpm*|*fedora*|*centos*|*mageia*) mode=rpm;;
                (*mingw*|*win*) mode=win;;
                (*) mode=deb;;
            esac;;
    esac
fi
case "$mode" in
    (deb|apt|win)
        OPTIONS='-o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confnew -y --force-yes --no-install-suggests --no-install-recommends'
        docker exec ${DOCKER_ID} apt-get update ${OPTIONS}
        #docker exec ${DOCKER_ID} apt-get upgrade ${OPTIONS}
        docker exec ${DOCKER_ID} apt-get install ${OPTIONS} python-software-properties software-properties-common apt-transport-https dpkg-dev lsb-release wget || \
            docker exec ${DOCKER_ID} apt-get install ${OPTIONS} software-properties-common apt-transport-https dpkg-dev lsb-release wget || \
            docker exec ${DOCKER_ID} apt-get install ${OPTIONS} python-software-properties apt-transport-https dpkg-dev lsb-release wget;
        if [[ "${img}" =~ "ubuntu" ]]; then
            docker exec ${DOCKER_ID} apt-get install ${OPTIONS} locales
            docker exec ${DOCKER_ID} locale-gen ${LANG}
            docker exec ${DOCKER_ID} update-locale LANG=${LANG}
        fi
        if test -n "${keys[*]}"; then # fix dependency bug in cosmic and stretch
            docker exec ${DOCKER_ID} apt-get install ${OPTIONS} gnupg
            for key in "${keys[@]}"; do
                wget -O- "$key" \
                    | docker exec -i ${DOCKER_ID} apt-key add -
            done
        fi
        for repo in "${repos[@]}"; do
            ifthenelse "${repo}" "apt-add-repository 'ARG'"
        done

        docker exec ${DOCKER_ID} apt-get update ${OPTIONS}
        for package in "${packages[@]}"; do
            ifthenelse "${package}" "apt-get install ${OPTIONS} ARG"
        done
        for command in "${commands[@]}"; do
            ifthenelse "${command}" "ARG"
        done
        docker exec ${DOCKER_ID} ./resolve-debbuilddeps.sh
        ;;
    (rpm|yum|dnf|zypper|urpmi)
        if [[ "$img" =~ "centos" ]]; then
            docker exec ${DOCKER_ID} yum install -y redhat-lsb epel-release
            docker exec -i ${DOCKER_ID} bash -c 'cat > /etc/yum.repos.d/wandisco-svn.repo' <<EOF
[WandiscoSVN]
name=Wandisco SVN Repo
EOF
            docker exec -i ${DOCKER_ID} bash -c 'echo "baseurl=http://opensource.wandisco.com/centos/$(lsb_release -sr | sed '"'"'s,[^0-9].*,,'"'"')/svn-'$(svn --version | head -1 | sed 's,[^0-9]*\([0-9]\+\.[0-9]\+\).*,\1,')'/RPMS/$(uname -i)/" >> /etc/yum.repos.d/wandisco-svn.repo'
            docker exec -i ${DOCKER_ID} bash -c 'cat >> /etc/yum.repos.d/wandisco-svn.repo' <<EOF
enabled=1
gpgcheck=0
EOF
        fi
        INSTALL_TOOL=$((docker exec ${DOCKER_ID} test -x /usr/bin/zypper && echo zypper install -y) ||  (docker exec ${DOCKER_ID} test -x /usr/bin/dnf && echo dnf install -y) || (docker exec ${DOCKER_ID} test -x /usr/bin/yum && echo yum install -y) || (docker exec ${DOCKER_ID} test -x /usr/sbin/urpmi && echo urpmi --auto))
        if test "$INSTALL_TOOL" = "urpmi --auto" -o "$INSTALL_TOOL" = "zypper install -y"; then
            LSB_RELEASE=lsb-release
        else
            LSB_RELEASE=/usr/bin/lsb_release
        fi
        docker exec ${DOCKER_ID} ${INSTALL_TOOL} rpm-build automake libtool subversion gcc-c++ pkgconfig wget $LSB_RELEASE
        if docker exec ${DOCKER_ID} test -x /usr/bin/dnf; then
            docker exec ${DOCKER_ID} dnf install -y 'dnf-command(config-manager)'
        fi
        i=0
        for key in "${keys[@]}"; do
            docker exec -i ${DOCKER_ID} wget -Orpm-key "$key"
            docker exec -i ${DOCKER_ID} rpm --import rpm-key
            docker exec -i ${DOCKER_ID} rm rpm-key
        done
        for repo in "${repos[@]}"; do
            INSTALL_REPO=$((docker exec ${DOCKER_ID} test -x /usr/bin/zypper && echo zypper ar) || (docker exec ${DOCKER_ID} test -x /usr/bin/dnf && echo dnf config-manager --add-repo) || (docker exec ${DOCKER_ID} test -x /usr/bin/yum && echo yum-config-manager --add-repo) || (docker exec ${DOCKER_ID} test -x /usr/sbin/urpmi && echo false))
            ifthenelse "${repo}" "${INSTALL_REPO} ARG"
            ((++i))
        done
        for package in "${packages[@]}"; do
            ifthenelse "${package}" "${INSTALL_TOOL} ARG"
        done
        for command in "${commands[@]}"; do
            ifthenelse "${command}" "ARG"
        done
        docker exec ${DOCKER_ID} ./resolve-rpmbuilddeps.sh
        ;;
esac
FLAGS=()
for f in "${flags[@]}"; do
    FLAGS+=($(ifthenelse "$f" "echo 'ARG'"))
done

if test -n "$commit"; then
    docker commit ${DOCKER_ID} "$commit"
    echo "commited new image: $commit"
    exit 0
fi
          
if test $prepare -eq 1; then
    waitforinput
    exit 0
fi
          
docker exec -u $(id -u):$(id -g) ${DOCKER_ID} ./bootstrap.sh ${clean} -t "${targets}" ${host} "${FLAGS[@]}"

# last check: try to install built deb or rpm files (if not already cleaned up)
# not supported in trusty and jessie
if test "$mode" = deb -a "${img//trusty/}" = "${img}" -a "${img//jessie/}" = "${img}"; then
   if test "${targets//deb/}" != "${targets}" && ls *.deb > /dev/null 2> /dev/null; then
       docker exec ${DOCKER_ID} bash -c "apt-get install ${OPTIONS} /workdir/*.deb"
   fi
fi
if test "$mode" = rpm -a "${targets//rpm/}" != "${targets}"; then
    if ls *.rpm > /dev/null 2> /dev/null; then
        docker exec ${DOCKER_ID} bash -c "${INSTALL_TOOL} /workdir/*.rpm"
    fi
fi
echo "done."