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#!/bin/bash
# This program 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; version 2 of the License.
#
# This program 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.

FORCE="n"
RUN=""
MAKEPKG_ARGS="-sr"
REPACK=""
COPY="copy"
WORKDIR=$PWD

update_first="0"
clean_first="0"
install_pkg=""
add_to_db=0

chrootdir=""

APPNAME=$(basename "${0}")

usage ()
{
    echo "usage ${APPNAME} [options] -r <chrootdir> [--] [makepkg args]"
    echo " Run this script in a PKGBUILD dir to build a package inside a"
    echo " clean chroot. All unrecognized arguments passed to this script"
    echo " will be passed to makepkg."
    echo ""
    echo " The chroot dir consists of the following directories:"
    echo " <chrootdir>/{root, copy} but only 'root' is required"
    echo " by default. The working copy will be created as needed"
    echo ""
    echo "The chroot 'root' directory must be created via the following"
    echo "command:"
    echo "    mkarchroot <chrootdir>/root base base-devel sudo"
    echo ""
    echo "Default makepkg args: $MAKEPKG_ARGS"
    echo ""
    echo "Flags:"
    echo "-h         This help"
    echo "-c         Clean the chroot before building"
    echo "-u         Update the working copy of the chroot before building"
    echo "           This is useful for rebuilds without dirtying the pristine"
    echo "           chroot"
    echo "-d         Add the package to a local db at /repo after building"
    echo "-r <dir>   The chroot dir to use"
    echo "-I <pkg>   Install a package into the working copy of the chroot"
    echo "-l <copy>  The directory to use as the working copy of the chroot"
    echo "           Useful for maintain multiple copies Default: copy"
    exit 1
}

while getopts 'hcudr:I:l:' arg; do
    case "${arg}" in
        h) usage ;;
        c) clean_first=1 ;;
        u) update_first=1 ;;
        d) add_to_db=1 ;;
        r) chrootdir="$OPTARG" ;;
        I) install_pkg="$OPTARG" ;;
        l) COPY="$OPTARG" ;;
        *) MAKEPKG_ARGS="$MAKEPKG_ARGS -$arg $OPTARG" ;;
    esac
done

#Get rid of trailing / in chrootdir
[ "$chrootdir" != "/" ] && chrootdir=$(echo $chrootdir | sed 's#/$##')
copydir="$chrootdir/$COPY"

# Pass all arguments after -- right to makepkg
MAKEPKG_ARGS="$MAKEPKG_ARGS ${*:$OPTIND}"

# See if -R was passed to makepkg
for arg in ${*:$OPTIND}; do
    if [ "$arg" = "-R" ]; then
        REPACK=1
        break;
    fi
done

if [ "$EUID" != "0" ]; then
    echo "This script must be run as root."
    exit 1
fi

if [ ! -f PKGBUILD ]; then
    echo "This must be run in a directory containing a PKGBUILD."
    exit 1
fi
source PKGBUILD

if [ ! -d "$chrootdir" ]; then
    echo "No chroot dir defined, or invalid path '$chrootdir'"
    exit 1
fi

if [ ! -d "$chrootdir/root" ]; then
    echo "Missing chroot dir root directory."
    echo "Try using: mkarchroot $chrootdir/root base base-devel sudo"
    usage
fi

umask 000
if [ ! -d "$copydir" -o "$clean_first" -eq "1" ]; then
    echo "creating clean working copy"
    mkdir -p "$copydir"
    rsync -a --delete -q -W "$chrootdir/root/" "$copydir"
fi

if [ -n "$install_pkg" ]; then
    pkgname="$(basename "$install_pkg")"
    echo "installing '$pkgname' in chroot"
    cp "$install_pkg" "$copydir/$pkgname"
    mkarchroot -r "pacman -U /$pkgname" "$copydir"
    ret=$?
    rm "$copydir/$pkgname"
    #exit early, we've done all we need to
    exit $ret
fi

if [ $update_first -eq 1 ]; then
    echo "updating chroot"
    mkarchroot -r "pacman -Syu --noconfirm" "$copydir"
fi

echo "moving build files to chroot"
[ -d "$copydir/build" ] || mkdir "$copydir/build"

if [ "$REPACK" != "1" ]; then
    #Remove anything in there UNLESS -R (repack) was passed to makepkg
    rm -rf "$copydir/build/"*
fi

# Get SRC/PKGDEST from makepkg.conf
SRCDEST=$(grep '^SRCDEST=' /etc/makepkg.conf | cut -d= -f2)
PKGDEST=$(grep '^PKGDEST=' /etc/makepkg.conf | cut -d= -f2)

[ -d "$copydir/pkgdest" ] || mkdir "$copydir/pkgdest"
if ! grep "PKGDEST=/pkgdest" "$copydir/etc/makepkg.conf" >/dev/null 2>&1; then
    echo "Setting PKGDEST in makepkg.conf"
    echo "PKGDEST=/pkgdest" >> "$copydir/etc/makepkg.conf"
fi

[ -d "$copydir/srcdest" ] || mkdir "$copydir/srcdest"
if ! grep "SRCDEST=/srcdest" "$copydir/etc/makepkg.conf" >/dev/null 2>&1; then
    echo "Setting SRCDEST in makepkg.conf"
    echo "SRCDEST=/srcdest" >> "$copydir/etc/makepkg.conf"
fi

# Copy PKGBUILD and sources
source PKGBUILD
cp PKGBUILD "$copydir/build/"
for f in ${source[@]}; do
    basef=$(echo $f | sed 's|::.*||' | sed 's|^.*://.*/||g')
    if [ -f "$basef" ]; then
        cp "$basef" "$copydir/srcdest/"
    elif [ -f "$SRCDEST/$basef" ]; then
        cp "$SRCDEST/$basef" "$copydir/srcdest/"
    fi
done

install_files=$(grep "install=" PKGBUILD)
for pkg in ${pkgname[@]}; do
    install_files+=' '
    install_files+=$(echo $install_files |sed "s/\$pkgname/$pkg/"|sed "s/\${pkgname}/$pkg/")
    install_files=$(eval echo $install_files |tr '[:blank:]' '\n'|sort |uniq)
done

for f in $install_files;do
    install="${f#"install="}"
    if [ "$install" != "" -a -f "$install" ]; then
        cp "$install" "$copydir/build/"
    fi
done

if [ -f "ChangeLog" ]; then
    cp ChangeLog "$copydir/build/"
fi

chown -R nobody "$copydir/build"
chown -R nobody "$copydir/srcdest"
chown -R nobody "$copydir/pkgdest"

if ! grep "^nobody" "$copydir/etc/sudoers" >/dev/null 2>&1; then
    echo "allowing 'nobody' sudo rights in the chroot"
    touch "$copydir/etc/sudoers"
    echo "nobody	ALL=(ALL) NOPASSWD: ALL" >> "$copydir/etc/sudoers"
    chmod 440 "$copydir/etc/sudoers"
fi

#This is a little gross, but this way the script is recreated every time in the
#working copy
(cat <<EOF
#!/bin/bash
export LANG=$LOCALE
cd /build
export HOME=/build
sudo -u nobody makepkg $MAKEPKG_ARGS || touch BUILD_FAILED
[ -f BUILD_FAILED ] && exit 1
which namcap &>/dev/null && namcap /build/PKGBUILD /pkgdest/*${PKGEXT} > /pkgdest/namcap.log
exit 0
EOF
) > "$copydir/chrootbuild"
chmod +x "$copydir/chrootbuild"

if mkarchroot -r "/chrootbuild" "$copydir"; then
    for pkgfile in "${copydir}"/pkgdest/*${PKGEXT}; do
        [ -e "$pkgfile" ] || continue
        _pkgname=$(basename "$pkgfile")
        if [ "$add_to_db" -eq "1" ]; then
                [ -d "${copydir}/repo" ] || mkdir -p "${copydir}/repo"
                pushd "${copydir}/repo" >/dev/null
                cp "$pkgfile" .
                repo-add repo.db.tar.gz "$_pkgname"
                popd >/dev/null
        fi

        if [ -d "$PKGDEST" ]; then
            echo "Moving completed ${_pkgname%${PKGEXT}} package file to ${PKGDEST}"
            mv "$pkgfile" "${PKGDEST}"
        else
            echo "Moving completed ${_pkgname%${PKGEXT}} package file to ${WORKDIR}"
            mv "$pkgfile" "${WORKDIR}"
        fi
    done

    for f in "${copydir}"/srcdest/*; do
        [ -e "$f" ] || continue
        if [ -d "$SRCDEST" ]; then
            echo "Moving downloaded source file $(basename $f) to ${SRCDEST}"
            mv "$f" "${SRCDEST}"
        else
            echo "Moving downloaded source file $(basename $f) to ${WORKDIR}"
            mv "$f" "${WORKDIR}"
        fi
    done

    for l in "${copydir}"/build/*-{build,package}.log; do
        [ -f "$l" ] && mv "$l" "${WORKDIR}"
    done
else
    #just in case. We returned 1, make sure we fail
    touch "${copydir}/build/BUILD_FAILED"
fi

if [ -e "${copydir}/build/BUILD_FAILED" ]; then
    echo "Build failed, check $copydir/build"
    rm "${copydir}/build/BUILD_FAILED"
else
    rm -rf "${copydir}"/build/*
    echo "Build complete"
fi	


# vim:ft=sh:ts=4:sw=4:et: