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#!/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%% *}
[[ ${binary:0:1} == '$' ]] && continue
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
}
add_systemd_drop_in() {
local unit=$1 dropin_name=$2
mkdir -p "$BUILDROOT/etc/systemd/system/$unit.d"
cat >"$BUILDROOT/etc/systemd/system/$unit.d/$2.conf"
}
build() {
local rules unit
# from base
add_binary /bin/mount
add_binary /usr/bin/kmod /usr/bin/modprobe
add_binary /usr/lib/systemd/systemd /init
add_binary /usr/bin/sulogin
map add_binary \
/usr/bin/systemd-tmpfiles \
/usr/lib/systemd/systemd-hibernate-resume \
/usr/lib/systemd/systemd-shutdown \
/usr/lib/systemd/systemd-sulogin-shell \
/usr/lib/systemd/system-generators/systemd-fstab-generator \
/usr/lib/systemd/system-generators/systemd-gpt-auto-generator \
/usr/lib/systemd/system-generators/systemd-hibernate-resume-generator
# for journalctl in emergency shell
add_binary journalctl
# udev rules and systemd units
map add_udev_rule "$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-root-device.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 \
reboot.target \
slices.target \
sockets.target \
swap.target \
systemd-fsck@.service \
systemd-hibernate-resume@.service \
systemd-journald.service \
systemd-journald-audit.socket \
systemd-journald-dev-log.socket \
systemd-modules-load.service \
systemd-tmpfiles-setup-dev.service \
systemd-udev-trigger.service \
systemd-udevd-control.socket \
systemd-udevd-kernel.socket \
systemd-udevd.service \
timers.target \
rescue.target \
emergency.target
add_symlink "/usr/lib/systemd/system/default.target" "initrd.target"
add_symlink "/usr/lib/systemd/system/ctrl-alt-del.target" "reboot.target"
add_binary "$(readlink -f /usr/lib/libnss_files.so)"
printf '%s\n' >"$BUILDROOT/etc/nsswitch.conf" \
'passwd: files' \
'group: files' \
'shadow: files'
echo "root:x:0:0:root:/:/bin/sh" >"$BUILDROOT/etc/passwd"
echo "root:x:0:root" >"$BUILDROOT/etc/group"
echo "root::::::::" >"$BUILDROOT/etc/shadow"
add_systemd_drop_in systemd-udevd.service resolve-names <<EOF
[Service]
ExecStart=
ExecStart=/usr/lib/systemd/systemd-udevd --resolve-names=never
EOF
add_dir "/etc/modules-load.d"
(
. "$_f_config"
set -f
printf '%s\n' ${MODULES[@]} >"$BUILDROOT/etc/modules-load.d/MODULES.conf"
)
}
help() {
cat <<HELPEOF
This will install a basic systemd setup in your initramfs, and is meant to
replace the 'base', 'usr', 'udev' and 'resume' 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:
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