#!/bin/sh

# The MIT License (MIT)
#
# Copyright (c) 2026 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


# lxc-mac [options...] [container name...] [extra packages...]
#
#
# LXC Make (custom) Alpine Container does what it says, installing all the
# package names given (if any).
#
# When not given, this tool asks for the name of the container to make, along
# with which Alpine Linux version/release to base it on: to automate these
# manual steps, you can pass the name as the 1st argument, and pipe the version
# from a simple run of `echo` or `printf`.
#
# While your hardware's architecture should auto-detect successfully, you
# can always set it explicitly via this script's options.
#
# The options are, available both in single and double-dash versions
#
#   -h, -help           show this help message
#   -amd64, -x86_64     use the `amd64` architecture
#   -arm64, -aarch64    use the `arm64` architecture
#   -riscv, -riscv64    use the `riscv64` architecture


architecture=''
case "$(arch)" in
    amd64|x86_64)
        architecture='amd64'
    ;;
    aarch64|arm64)
        architecture='arm64'
    ;;
    riscv64)
        architecture='riscv64'
    ;;
esac

case "$1" in
    -h|--h|-help|--help)
        awk '/^# +lxc-mac /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;

    -amd64|--amd64|-x86|--x86|-x86_64|--x86_64)
        architecture='amd64'
        shift
    ;;

    -aarch64|--aarch64|-arm64|--arm64)
        architecture='arm64'
        shift
    ;;

    -riscv|--riscv|-riscv64|--riscv64)
        architecture='riscv64'
        shift
    ;;
esac

[ "$1" = '--' ] && shift

if [ -z "${architecture}" ]; then
    awk '/^# +lxc-mac /, /^$/ { gsub(/^# ?/, ""); print }' "$0" >&2
    printf "\n" >&2
    printf "error: can't auto-detect which hardware architecture to use\n" >&2
    exit 1
fi

container="$1"
[ $# -gt 0 ] && shift

# ask for the container name, when not given
while [ -z "${container}" ]; do
    printf "container name: "
    read -r container
done

# ensure line ends in case stdin is being piped-in
printf "\n"

lxc-create -n "${container}" -t download -- -a "${architecture}" -d alpine \
|| exit $?

# ensure line ends in case stdin is being piped-in
printf "\n"

lxc-start "${container}"

{
    # ensure the latest available stable versions
    # printf "apk update\n"
    # printf "apk upgrade\n"

    # add all packages mentioned
    for pkg in "$@"; do
        # printf "apk add %s\n" "${pkg}"
        printf "apk add --no-cache %s\n" "${pkg}"
    done

    # save a few megabytes
    # printf "rm /var/cache/apk/*\n"

    # quit the install session
    printf "exit\n"
} \
| lxc-attach "${container}"

lxc-stop "${container}"