115 lines
2.9 KiB
Bash
115 lines
2.9 KiB
Bash
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#!/usr/bin/env bash
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# 2018 Luke Shumaker
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declare -r NAME=mkosi
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declare -r VERSION=20180725
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# Why is this different than mkosi[1]?
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#
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# - mkosi claims to be "legacy-free"--but they call everything that's
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# not systemd "legacy"; that clearly won't do for creating OpenRC or
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# GNU Shepherd images.
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#
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# - mkosi claims to be "legacy-free", only supporting GPT
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# disk-labels--but btrfs can be booted directly, without a separate
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# disk-label, or a separate ESP partition. To a btrfs disk, GPT/ESP
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# is legacy.
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#
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# - Using a raw btrfs disk means that it can easily be mounted without
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# first disecting the disk-label.
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#
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# [1]: https://github.com/systemd/mkosi
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print() {
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# shellcheck disable=SC2059
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printf "$(gettext -- "$1")\\n" "${@:2}"
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}
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error() {
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local msg
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msg="$(print "${@:2}")"
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printf '%s: %s\n' "${0##*/}" "$msg"
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if (( $1 != 0 )); then
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exit "$1"
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fi
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}
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main() {
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set -euE
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local arg_mode=outside
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local arg_mountpoint=
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local arg_size=1G
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local arg_file
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local args
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if ! args="$(getopt -n "${0##*/}" -o "Vhs" -l "inside:,version,help,size" -- "$@")"; then
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arg_mode=error
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else
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eval "args=($args)"
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set -- "${args[@]}"
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while true; do
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case "$1" in
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--inside) shift; arg_mode=inside; arg_mountpoint=$1; shift;;
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-V|--version) shift; arg_mode=version;;
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-h|--help) shift; arg_mode=usage;;
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-s|--size) shift; arg_size=$1;;
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--) shift; break;;
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esac
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done
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if (( $# != 1 )); then
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if (( $# == 0 )); then
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error 0 "Expected 1 positional argument, got none"
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else
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error 0 "Expected 1 positional argument, got %d: %s" "$#" "${@@Q}"
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fi
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arg_mode=error
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else
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arg_file=$1
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fi
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fi
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case "$arg_mode" in
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error) print "Try '%q --help' for more information" "${0##*/}" >&2; return 2;;
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version)
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print "%s (notsystemd) %s" "$NAME" "$VERSION"
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return 0
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;;
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usage)
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print 'Usage: %s [OPTIONS]' "${0##*/} FILENAME.IMG"
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print 'Make Operating System Image'
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echo
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print 'Create a mountable, bootable OS image.'
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echo
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print 'OPTIONS:'
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# --inside is internal-only; undocumented
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print ' -s SIZE, --size=SIZE set the size of the image (default: 1G)'
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echo
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print ' -h, --help display this help'
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print ' -V, --version output version information'
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return 0
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;;
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# main code starts here
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outside)
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if (( UID != 0 )); then
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error 2 "Must be invoked as root."
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fi
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arg_mountpoint=$(mktemp -dt -- "${0##*/}.XXXXXXXXXX")
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# shellcheck disable=SC2064
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trap "rmdir -- ${arg_mountpoint@Q}" EXIT
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unshare --mount -- "${BASH_SOURCE[0]}" --inside="$arg_mountpoint" "${args[@]}"
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;;
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inside) # just keep reading...
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mount --make-rslave /
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truncate --size="$arg_size" -- "$arg_file"
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mkfs.btrfs -- "$arg_file"
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mount "$arg_file" "$arg_mountpoint"
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pacstrap -M -C /usr/share/pacman/defaults/pacman.conf.x86_64 -- "$arg_mountpoint" base grub
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arch-chroot -- "$arg_mountpoint" bash -i
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;;
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*) error 'Internal error. The programmer writing this tool screwed up.'; exit 1;;
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esac
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}
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main "$@"
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