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Diffstat (limited to 'mkarchroot.in')
| -rw-r--r-- | mkarchroot.in | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/mkarchroot.in b/mkarchroot.in new file mode 100644 index 0000000..96f4399 --- /dev/null +++ b/mkarchroot.in @@ -0,0 +1,302 @@ +#!/bin/bash +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; version 2 of the License. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +source @pkgdatadir@/common.sh + +CHROOT_VERSION='v2' + +FORCE='n' +RUN='' +NOCOPY='n' +NONETWORK='n' + +working_dir='' + +APPNAME=$(basename "${0}") + +# usage: usage <exitvalue> +usage() { + echo "Usage: ${APPNAME} [options] working-dir [action]" + echo ' options:' + echo ' -f Force overwrite of files in the working-dir' + echo ' -C <file> Location of a pacman config file' + echo ' -M <file> Location of a makepkg config file' + echo ' -n Do not copy config files into the chroot' + echo ' -c <dir> Set pacman cache' + echo ' -N Disable networking in the chroot' + echo ' actions:' + echo ' -i <pkg-list> Install "pkg-list" in the chroot.' + echo ' Creates the chroot if necessary, workding-dir must exist' + echo ' -r <cmd> Run "cmd" within the context of the chroot' + echo ' -u Update the chroot via pacman' + echo ' -h Print this message' + + exit ${1-1} +} + +################################################################################ + +while getopts 'fC:M:nc:Nh' arg; do + case "${arg}" in + f) FORCE='y' ;; + C) pac_conf="$OPTARG" ;; + M) makepkg_conf="$OPTARG" ;; + n) NOCOPY='y' ;; + c) cache_dir="$OPTARG" ;; + N) NONETWORK='y' ;; + + h) action="-$arg" ;; + + *) error "invalid argument '${arg}'"; usage ;; + esac +done + +shift $(($OPTIND - 1)) + +if (( $# < 2 )); then + error 'You must specify a directory and an action.' + usage +fi + +working_dir="$(readlink -f "${1}")" +shift 1 +[[ -z $working_dir ]] && die 'Please specify a working directory.' + +action=$1 +shift 1 +case "$action" in + -i) PKGS=("$@") ;; + -r) RUN="$*" ;; + -u) + (( $# > 0 )) && { error 'Extra arguments.'; usage; } + RUN='/bin/sh -c "pacman -Syu --noconfirm && (pacman -Qqu >/dev/null && pacman -Su --noconfirm || exit 0)"' + ;; + -h) usage 0 ;; + -*) error "invalid argument '${action#-}'"; usage ;; + *) error "invalid action '${action}'"; usage ;; +esac +unset action + +################################################################################ + +if (( $EUID != 0 )); then + die 'This script must be run as root.' +fi + +if [[ -z $cache_dir ]]; then + cache_dirs=($(pacman -v $cache_conf 2>&1 | grep '^Cache Dirs:' | sed 's/Cache Dirs:\s*//g')) +else + cache_dirs=(${cache_dir}) +fi + +host_mirror=$(pacman -Sddp extra/devtools 2>/dev/null | sed -E 's#(.*/)extra/os/.*#\1$repo/os/$arch#') +if echo "${host_mirror}" | grep -q 'file://'; then + host_mirror_path=$(echo "${host_mirror}" | sed -E 's#file://(/.*)/\$repo/os/\$arch#\1#g') +fi + +# {{{ functions +bind_mount() { + local mode="${2:-rw}" + local target="${working_dir}${1}" + + if [[ ! -e "$target" ]]; then + if [[ -d "$1" ]]; then + install -d "$target" + else + install -D /dev/null "$target" + fi + fi + + mount -o bind "$1" "$target" + mount -o remount,${mode},bind "$target" + mount --make-slave "$target" +} + +chroot_mount() { + trap 'trap_chroot_umount' EXIT INT QUIT TERM HUP + + if (( ! have_nspawn )); then + bind_mount /sys ro + + [[ -e "${working_dir}/proc" ]] || mkdir "${working_dir}/proc" + mount -t proc proc -o nosuid,noexec,nodev "${working_dir}/proc" + bind_mount /proc/sys ro + + [[ -e "${working_dir}/dev" ]] || mkdir "${working_dir}/dev" + mount -t tmpfs dev "${working_dir}/dev" -o mode=0755,size=10M,nosuid,strictatime + mknod -m 666 "${working_dir}/dev/null" c 1 3 + mknod -m 666 "${working_dir}/dev/zero" c 1 5 + mknod -m 600 "${working_dir}/dev/console" c 5 1 + mknod -m 644 "${working_dir}/dev/random" c 1 8 + mknod -m 644 "${working_dir}/dev/urandom" c 1 9 + mknod -m 666 "${working_dir}/dev/tty" c 5 0 + mknod -m 666 "${working_dir}/dev/ptmx" c 5 2 + mknod -m 666 "${working_dir}/dev/tty0" c 4 0 + mknod -m 666 "${working_dir}/dev/full" c 1 7 + mknod -m 666 "${working_dir}/dev/rtc0" c 254 0 + ln -s /proc/kcore "${working_dir}/dev/core" + ln -s /proc/self/fd "${working_dir}/dev/fd" + ln -s /proc/self/fd/0 "${working_dir}/dev/stdin" + ln -s /proc/self/fd/1 "${working_dir}/dev/stdout" + ln -s /proc/self/fd/2 "${working_dir}/dev/stderr" + + [[ -e "${working_dir}/dev/shm" ]] || mkdir "${working_dir}/dev/shm" + mount -t tmpfs shm "${working_dir}/dev/shm" -o nodev,nosuid,size=128M + + bind_mount /dev/pts + + [[ -e "${working_dir}/run" ]] || mkdir "${working_dir}/run" + mount -t tmpfs tmpfs "${working_dir}/run" -o mode=0755,nodev,nosuid,strictatime,size=64M + + for host_config in resolv.conf localtime; do + bind_mount /etc/$host_config ro + done + fi + + [[ -n $host_mirror_path ]] && bind_mount "$host_mirror_path" ro + + bind_mount "${cache_dirs[0]}" + for cache_dir in ${cache_dirs[@]:1}; do + bind_mount "$cache_dir" ro + done +} + +copy_hostconf () { + cp -a /etc/pacman.d/gnupg "${working_dir}/etc/pacman.d" + echo "Server = ${host_mirror}" > ${working_dir}/etc/pacman.d/mirrorlist + + if [[ -n $pac_conf && $NOCOPY = 'n' ]]; then + cp ${pac_conf} ${working_dir}/etc/pacman.conf + fi + + if [[ -n $makepkg_conf && $NOCOPY = 'n' ]]; then + cp ${makepkg_conf} ${working_dir}/etc/makepkg.conf + fi + + sed -r "s|^#?\\s*CacheDir.+|CacheDir = $(echo -n ${cache_dirs[@]})|g" -i ${working_dir}/etc/pacman.conf +} + +trap_unmount_err () { + error "Error unmounting" +} + +trap_chroot_umount () { + trap 'trap_unmount_err' INT QUIT TERM HUP EXIT + + for cache_dir in ${cache_dirs[@]}; do + umount "${working_dir}/${cache_dir}" + done + [[ -n $host_mirror_path ]] && umount "${working_dir}/${host_mirror_path}" + + if (( ! have_nspawn )); then + for host_config in resolv.conf localtime; do + umount "${working_dir}/etc/${host_config}" + done + umount "${working_dir}/proc/sys" + umount "${working_dir}/proc" + umount "${working_dir}/sys" + umount "${working_dir}/dev/pts" + umount "${working_dir}/dev/shm" + umount "${working_dir}/dev" + umount "${working_dir}/run" + fi + + trap 'trap_abort' INT QUIT TERM HUP + trap 'trap_exit' EXIT +} + +chroot_lock () { + lock_open_write 9 "${working_dir}" "Locking chroot" +} + +chroot_run() { + local dir=$1 + shift + if (( have_nspawn)); then + local nspawn_args=(-D "$dir") + if [[ $NONETWORK = y ]]; then + nspawn_args+=(--private-network) + fi + eval systemd-nspawn "${nspawn_args[@]}" -- "${@}" 2>/dev/null + else + local unshare_args=(-mui) + if [[ $NONETWORK = y ]]; then + unshare_args+=(-n) + fi + eval unshare "${unshare_args[@]}" -- chroot "${dir}" "${@}" + fi +} + +# }}} + +# use systemd-nspawn if we have it available and systemd is running +if type -P systemd-nspawn >/dev/null && mountpoint -q /sys/fs/cgroup/systemd; then + have_nspawn=1 +fi + +umask 0022 +if [[ -n $RUN ]]; then + # run chroot {{{ + #Sanity check + if [[ ! -f "${working_dir}/.arch-chroot" ]]; then + die "'${working_dir}' does not appear to be a Arch chroot." + elif [[ $(cat "${working_dir}/.arch-chroot") != ${CHROOT_VERSION} ]]; then + die "'${working_dir}' is not compatible with ${APPNAME} version ${CHROOT_VERSION}. Please rebuild." + fi + + chroot_lock + chroot_mount + copy_hostconf + + chroot_run "${working_dir}" ${RUN} + + # }}} +else + # {{{ build chroot + if [[ -e $working_dir && $FORCE = 'n' ]]; then + die "Working directory '${working_dir}' already exists - try using -f" + fi + + if { type -P btrfs && btrfs subvolume create "${working_dir}"; } &>/dev/null; then + chmod 0755 "${working_dir}" + fi + + chroot_lock + chroot_mount + + pacargs="${cache_dirs[@]/#/--cachedir=}" + if [[ -n $pac_conf ]]; then + pacargs="$pacargs --config=${pac_conf}" + fi + + if (( $# != 0 )); then + if [[ $FORCE = 'y' ]]; then + pacargs="$pacargs --force" + fi + if ! pacstrap -GMcd "${working_dir}" ${pacargs} "${PKGS[@]}"; then + die 'Failed to install all packages' + fi + fi + + if [[ -d "${working_dir}/lib/modules" ]]; then + chroot_run "${working_dir}" ldconfig + fi + + if [[ -e "${working_dir}/etc/locale.gen" ]]; then + sed -i 's@^#\(en_US\|de_DE\)\(\.UTF-8\)@\1\2@' "${working_dir}/etc/locale.gen" + chroot_run "${working_dir}" locale-gen + fi + echo 'LANG=C' > "${working_dir}/etc/locale.conf" + + copy_hostconf + + echo "${CHROOT_VERSION}" > "${working_dir}/.arch-chroot" + # }}} +fi |