#!/bin/sh -e
# Create/destroy temporary chroots

log() {
    printf '\033[31;1m->\033[m %s.\n' "$@"
}

die() {
    rm -f kiss-chroot.tar.xz kiss-chroot.tar.xz.sha256

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

    exit 1
}

sh256() {
    # There's no standard utility to generate sha256 checksums.
    # This is a simple wrapper around sha256sum, sha256, shasum
    # and openssl which will use whatever is available.
    #
    # All utilities must match 'sha256sum' output.
    #
    # Example: '<checksum>  <file>'
    [ -e "$1" ] || return 0

    hash=$(sha256sum "$1" ||
           sha256 -r "$1" ||
           openssl dgst -sha256 -r "$1" ||
           shasum -a 256 "$1")

    printf '%s  %s\n' "${hash%% *}" "$1"
} 2>/dev/null

cd "${cac_dir:=$KISS_ROOT${XDG_CACHE_HOME:-$HOME/.cache}/kiss}"
url=https://github.com/kisslinux/repo/releases/download/1.10.0/

[ -f kiss-chroot.tar.xz ] || {
    log "Downloading chroot tarball"
    curl -OL "$url/kiss-chroot.tar.xz" ||
        die "Failed to download kiss-chroot.tar.xz"
}

[ -f kiss-chroot.tar.xz.sha256 ] || {
    log "Downloading checksums"
    curl -OL "$url/kiss-chroot.tar.xz.sha256" ||
        die "Failed to download kiss-chroot.tar.xz.sha256"
}

log "Verifying checksums"
sh256 kiss-chroot.tar.xz | diff - kiss-chroot.tar.xz.sha256 ||
    die "Checksum verification failed."

[ -d kiss-chroot ] || {
    log "Extracting chroot"

    tar xf kiss-chroot.tar.xz ||
        die "Failed to extract tarball"
}

log "Creating temporary chroot"
cp -a kiss-chroot "chroot-$$"

log "Installing any arguments"
[ ! "$1" ] || KISS_ROOT=$PWD/chroot-$$ kiss i "$@"

log "Entering chroot"
su -c "kiss-chroot chroot-$$; rm -rf chroot-$$"