#!/bin/sh -e
# Create/destroy temporary chroots
case "$1" in
    --help|-h) printf '\033[1;33m-> \033[m%s\n' "usage: ${0##*/} [pkg...]"; exit 0
esac

# shellcheck disable=1091
. cpt-lib

die() {
    rm -f carbs-rootfs.tar.xz carbs-rootfs.tar.xz.sum

    log "$@"
    log "Re-run 'cpt-chbuild' to try again."

    exit 1
}

case "$(uname -m)" in i*86) arch=i686; esac
url="https://dl.carbslinux.org/releases/${arch:-$(uname -m)}/carbs-rootfs.tar.xz"
pid=$$

cd "$cac_dir"

[ -f carbs-rootfs.tar.xz ] || {
    log "Downloading chroot tarball"
    curl -fLO "$url"
}

[ -f carbs-rootfs.tar.xz.sum ] || {
    log "Downloading checksums"
    curl -fLo- "${url%/*}/sha256sums.txt" |
        grep ' carbs-rootfs.tar.xz$' > carbs-rootfs.tar.xz.sum
}

log "Verifying checksums"
sh256 carbs-rootfs.tar.xz | diff - carbs-rootfs.tar.xz.sum ||
    die "Checksum verification failed"


[ -d carbs-chroot ] || {
    log "Extracting chroot"
    mkdir -p carbs-chroot
    ( cd carbs-chroot; tar xf ../carbs-rootfs.tar.xz )
}

log "Creating temporary chroot"
cp -a carbs-chroot "chroot-$pid"

[ "$1" ] && {
    log "Installing extra packages"
    CPT_ROOT=$PWD/chroot-$pid cpt-install "$@"
}

run_hook pre-chroot "" "$PWD/chroot-$pid"

log "Entering chroot"
if [ "$(id -u)" -eq 0 ]; then
    cpt-chroot "chroot-$pid"
    rm -rf "chroot-$pid"
else
    as_root sh -c "cpt-chroot chroot-$pid; rm -rf chroot-$pid"
fi