#!/bin/bash

set -euo pipefail

usage() {
    local cmd="${0##*/}"
    echo "Usage: $cmd [options] -- [archbuild args]"
    echo "    -r <repository>    Repository name"
    echo "    -a <architecture>  Repository architecture"
    echo "    -c <directory>     Read devtools pacman configurations from this directory"
}

repository=
architecture=
pacman_config_dir=

while getopts ":r:a:c:" arg; do
    case "$arg" in
        r) repository="$OPTARG" ;;
        a) architecture="$OPTARG" ;;
        c) pacman_config_dir="$OPTARG" ;;
        *) usage >&2; exit 1 ;;
    esac
done

if [[ -z $repository || -z $architecture ]]; then
    usage >&2
    exit 1
fi

if [[ -n $pacman_config_dir && ! -d $pacman_config_dir ]]; then
    echo "devtools configuration directory does not exist: $pacman_config_dir" >&2
    exit 1
fi

source "/usr/share/devtools/lib/archroot.sh"
check_root "SOURCE_DATE_EPOCH,SRCDEST,SRCPKGDEST,PKGDEST,LOGDEST,NPROC,MAKEFLAGS,PACKAGER,GNUPGHOME" "${BASH_SOURCE[0]}" "$@"

# because devtools doesn't allow to read configuration from custom path
# here is a workaround, which uses unshare to bind-mount directory with configuration files
# for specific process
if [[ -n $pacman_config_dir && -z ${AHRIMAN_ARCHBUILD_MOUNTED:-} ]]; then
    pacman_config_dir="$(readlink -e -- "$pacman_config_dir")"
    export AHRIMAN_ARCHBUILD_MOUNTED=1

    exec unshare --mount --propagation private \
        bash -c 'mount --bind -- "$0" /usr/share/devtools/pacman.conf.d && exec "$@"' \
        "$pacman_config_dir" "${BASH_SOURCE[0]}" "$@"
fi

exec bash -c 'source "/usr/bin/archbuild" "$@"' \
    "${repository}-${architecture}-build" "${@:$OPTIND}"