#!/bin/bash strip_quotes() { local len=${#1} quotes=$'[\'"]' str=${!1} if [[ ${str:0:1} = ${str: -1} && ${str:0:1} = $quotes ]]; then printf -v "$1" %s "${str:1:-1}" fi } add_udev_rule() { # Add an udev rules file to the initcpio image. Dependencies on binaries # will be discovered and added. # $1: path to rules file (or name of rules file) local rules= rule= key= value= binary= rules=$(PATH=/usr/lib/udev/rules.d:/lib/udev/rules.d type -P "$1") if [[ -z $rules ]]; then # complain about not found rules return 1 fi add_file "$rules" while IFS=, read -ra rule; do # skip empty lines, comments [[ -z $rule || $rule = @(+([[:space:]])|#*) ]] && continue for pair in "${rule[@]}"; do IFS=' =' read -r key value <<< "$pair" case $key in RUN@({program}|+)|IMPORT{program}|ENV{REMOVE_CMD}) strip_quotes 'value' # just take the first word as the binary name binary=${value%% *} if [[ ${binary:0:1} != '/' ]]; then binary=$(PATH=/usr/lib/udev:/lib/udev type -P "$binary") fi add_binary "$binary" ;; esac done done <"$rules" } add_systemd_unit() { # Add a systemd unit file to the initcpio image. Hard dependencies on binaries # and other unit files will be discovered and added. # $1: path to rules file (or name of rules file) local unit= rule= entry= key= value= binary= dep= unit=$(PATH=/usr/lib/systemd/system:/lib/systemd/system type -P "$1") if [[ -z $unit ]]; then # complain about not found unit file return 1 fi add_file "$unit" while IFS='=' read -r key values; do read -ra values <<< "$values" case $key in Requires|OnFailure) # only add hard dependencies (not Wants) map add_systemd_unit "${values[@]}" ;; Exec*) # don't add binaries unless they are required if [[ ${values[0]:0:1} != '-' ]]; then add_binary "${values[0]}" fi ;; esac done <"$unit" # preserve reverse soft dependency for dep in {/usr,}/lib/systemd/system/*.wants/${unit##*/}; do if [[ -L $dep ]]; then add_symlink "$dep" fi done # add hard dependencies if [[ -d $unit.requires ]]; then for dep in "$unit".requires/*; do add_systemd_unit ${dep##*/} done fi } build() { local rules unit # from base add_binary /bin/mount add_binary /usr/bin/kmod /usr/bin/modprobe add_binary /usr/lib/systemd/systemd /init map add_binary \ /usr/lib/systemd/systemd-hibernate-resume \ /usr/lib/systemd/system-generators/systemd-hibernate-resume-generator \ /usr/bin/systemd-tmpfiles # generators map add_file \ /usr/lib/systemd/system-generators/systemd-fstab-generator \ /usr/lib/systemd/system-generators/systemd-gpt-auto-generator # udev rules and systemd units map add_udev_rule "$rules" \ 50-udev-default.rules \ 60-persistent-storage.rules \ 64-btrfs.rules \ 80-drivers.rules \ 99-systemd.rules map add_systemd_unit \ initrd-cleanup.service \ initrd-fs.target \ initrd-parse-etc.service \ initrd-root-fs.target \ initrd-switch-root.service \ initrd-switch-root.target \ initrd-udevadm-cleanup-db.service \ initrd.target \ kmod-static-nodes.service \ local-fs.target \ local-fs-pre.target \ paths.target \ slices.target \ sockets.target \ swap.target \ systemd-fsck@.service \ systemd-hibernate-resume@.service \ systemd-journald.service \ systemd-journald-dev-log.socket \ systemd-tmpfiles-setup-dev.service \ systemd-udev-trigger.service \ systemd-udevd-control.socket \ systemd-udevd-kernel.socket \ systemd-udevd.service \ timers.target add_symlink "/usr/lib/systemd/system/default.target" "initrd.target" add_symlink "/usr/lib/systemd/system/ctrl-alt-del.target" "reboot.target" # udev wants /etc/group since it doesn't launch with --resolve-names=never add_file "/etc/nsswitch.conf" add_binary "$(readlink -f /usr/lib/libnss_files.so)" add_file "/etc/passwd" add_file "/etc/group" } help() { cat <<HELPEOF This will install a basic systemd setup in your initramfs, and is meant to replace the 'base', 'usr', 'udev' and 'timestamp' hooks. Other hooks with runtime components will need to be ported, and will not work as intended. You also may wish to still include the 'base' hook (before this hook) to ensure that a rescue shell exists on your initramfs. HELPEOF } # vim: set ft=sh ts=4 sw=4 et: