#!/usr/bin/env bash
# pull — unpack a Docker image into a plain directory, no btrfs/overlay/etc required.
#
#   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/traceypooh/shocker/HEAD/pull)" pull alpine [DEST DIR]
#
# Delegates to shocker_pull() in the main `shocker` script (SHOCKER_DEST mode), so all
# registry/auth/manifest logic stays in one place. To poke around the result:
#   unshare -fmup chroot [DEST DIR] /bin/sh

set -o errexit -o nounset -o pipefail

SHOCKER_URL="${SHOCKER_URL:-https://raw.githubusercontent.com/traceypooh/shocker/HEAD/shocker}"

img="${1:?usage: pull <image[:tag]> [dest-dir]}"
dest="${2:-$(echo "$img" | tr '/:' '__')}"

SHOCKER_DEST="$dest" bash -c "$(curl -fsSL "$SHOCKER_URL")" shocker pull "$img"

echo "Unpacked '$img' into: $dest"
echo "Try it:  unshare -fmup chroot $dest /bin/sh"