redesign code style and fix some issues
This commit is contained in:
illiliti
parent
0e8ed8c2c9
commit
9645b8c3c4
216
tinyramfs
216
tinyramfs
@ -1,19 +1,13 @@
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#!/bin/sh -ef
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#
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# tiny initramfs
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#
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# false positive
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# shellcheck disable=2154
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msg()
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{
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case "$1" in
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info)
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printf "info >> %s\n" "$2"
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;;
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panic)
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printf "panic >> %s\n" "$2" >&2
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exit 1
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;;
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esac
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}
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# TODO add some colors ?
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panic() { printf "panic >> %s\n" "$1" >&2; exit 1; }
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info() { printf "info >> %s\n" "$1"; }
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usage()
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{
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@ -32,8 +26,7 @@ EOF
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parse_args()
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{
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while [ "$1" ]; do
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case "$1" in
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while [ "$1" ]; do case "$1" in
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-o | --output)
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_output="${2:?}"
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shift 2
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@ -71,30 +64,24 @@ parse_args()
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usage
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exit 1
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;;
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esac
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done
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esac; done
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}
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prepare_environment()
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{
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msg info "preparing environment"
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info "preparing environment"
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for _file in $_config /etc/tinyramfs/config ./config; do
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[ -f "$_file" ] &&
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{
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. "$_file"
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break
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}
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done || msg panic "failed to source config"
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# false positive
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# shellcheck disable=1090
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[ -f "$_file" ] && { . "$_file"; break; }
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done || panic "failed to source config"
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for _dir in $_filesdir /usr/share/tinyramfs ./usr/share/tinyramfs; do
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[ -d "$_dir" ] &&
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{
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filesdir="$_dir"
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break
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}
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done || msg panic "failed to locate required files"
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[ -d "$_dir" ] && { filesdir="$_dir"; break; }
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done || panic "failed to locate required files"
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# general variables
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debug="${_debug:-${debug:-0}}"
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force="${_force:-${force:-0}}"
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moddir="${_moddir:-${moddir:-/lib/modules}}"
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@ -102,8 +89,9 @@ prepare_environment()
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output="${_output:-${output:-/tmp/initramfs-${kernel}}}"
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mkdir -p "${workdir=${XDG_CACHE_HOME:-${TMPDIR:-/tmp}}/initramfs.$$}" ||
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msg panic "failed to create working directory"
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panic "failed to create working directory"
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# helpers variables
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workdirbin="${workdir}/usr/bin/"
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workdirlib="${workdir}/usr/lib/"
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modker="${moddir}/${kernel}"
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@ -112,22 +100,17 @@ prepare_environment()
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remove_workdir()
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{
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msg info "removing working directory"
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info "removing working directory"
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rm -rf "$workdir"
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}
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install_requirements()
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{
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msg info "installing requirements"
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info "installing requirements"
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# install user specified binaries if any
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for _binary in $binaries; do
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install_binary "$_binary"
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done
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# install required binaries
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for _binary in \[ sh sleep mount printf setsid switch_root; do
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# install user specified and required binaries
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for _binary in $binaries \[ sh sleep mount printf setsid switch_root; do
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install_binary "$_binary"
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done
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@ -136,31 +119,33 @@ install_requirements()
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# copy config
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printf "%s\n" \
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monolith="$monolith" \
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root="$root" \
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root_type="$root_type" \
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root_opts="$root_opts" \
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devmgr="$devmgr" \
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lvm="$lvm" \
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lvm_opts="$lvm_opts" \
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luks="$luks" \
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luks_root="$luks_root" \
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luks_opts="$luks_opts" \
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> "${workdir}/etc/config"
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monolith="$monolith" \
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>> "${workdir}/etc/config"
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}
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create_structure()
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{
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msg info "creating directory structure"
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info "creating directory structure"
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for _dir in etc tmp dev sys proc root usr/lib usr/bin mnt/root; do
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mkdir -p "${workdir}/${_dir}"
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done
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mkdir -p \
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"${workdir}/etc" \
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"${workdir}/dev" \
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"${workdir}/sys" \
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"${workdir}/tmp" \
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"${workdir}/proc" \
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"${workdir}/root" \
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"${workdir}/usr/lib" \
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"${workdir}/usr/bin" \
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"${workdir}/mnt/root"
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}
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create_symlinks()
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{
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msg info "creating symlinks"
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info "creating symlinks"
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ln -s usr/lib "${workdir}/lib"
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ln -s usr/lib "${workdir}/lib64"
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@ -172,7 +157,24 @@ create_symlinks()
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install_devmgr()
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{
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msg info "installing device manager"
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info "installing device manager"
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install_devmgr_helper()
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{
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for _binary in ln kill mkdir blkid "${filesdir}/device-helper"; do
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install_binary "$_binary"
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done
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printf "%s\n" \
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'SUBSYSTEM=block;.* 0:0 660 @device-helper' \
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> "${workdir}/etc/mdev.conf"
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# false positive
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# shellcheck disable=2016
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[ "$monolith" != 1 ] && printf "%s\n" \
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'$MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"' \
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>> "${workdir}/etc/mdev.conf"
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}
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# TODO investigate booting without device manager
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case "$devmgr" in
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@ -182,8 +184,7 @@ install_devmgr()
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done
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# exclusively handle requirement
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[ "$luks" = 1 ] || [ "$lvm" = 1 ] &&
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install_binary dmsetup
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[ "$luks" = 1 ] || [ "$lvm" = 1 ] && install_binary dmsetup
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for _binary in /usr/lib/udev/ata_id /usr/lib/udev/scsi_id; do
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install -Dm755 "$_binary" "${workdir}${_binary}"
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@ -194,48 +195,47 @@ install_devmgr()
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install -Dm644 "$_file" "${workdir}${_file}"
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done; set -f
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;;
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mdev | mdevd)
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[ "$devmgr" = mdev ] && install_binary mdev
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[ "$devmgr" = mdevd ] &&
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mdev)
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install_binary mdev
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install_devmgr_helper
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;;
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mdevd)
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for _binary in mdevd mdevd-coldplug; do
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install_binary "$_binary"
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done
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for _binary in ln kill mkdir blkid "${filesdir}/device-helper"; do
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install_binary "$_binary"
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done
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printf "%s\n" \
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'SUBSYSTEM=block;.* 0:0 660 @device-helper' \
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> "${workdir}/etc/mdev.conf"
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[ "$monolith" != 1 ] && printf "%s\n" \
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'$MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"' \
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>> "${workdir}/etc/mdev.conf"
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install_devmgr_helper
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;;
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esac
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}
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install_lvm()
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{
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msg info "installing LVM"
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info "installing LVM"
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for _binary in lvchange vgchange; do
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install_binary "$_binary"
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done
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{ IFS=,; set -- $lvm_opts; IFS="$OLD_IFS"; }
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for opt; do
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case "$opt" in
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config | config=1)
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install -Dm644 /etc/lvm/lvm.conf "${workdir}/etc/lvm/lvm.conf"
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return
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;;
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esac
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done
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# copy config
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printf "%s\n" \
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lvm="$lvm" \
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lvm_opts="$lvm_opts" \
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>> "${workdir}/etc/config"
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mkdir -p "${workdir}/etc/lvm"
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# word splitting is safe by design
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# shellcheck disable=2086
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{ IFS=,; set -- $lvm_opts; IFS="$OLD_IFS"; }
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for opt; do case "$opt" in
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config | config=1)
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lvmconfig > "${workdir}/etc/lvm/lvm.conf"
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return
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;;
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esac; done
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printf "%s\n" \
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'devices {' \
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'write_cache_state = 0' \
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@ -252,19 +252,26 @@ install_lvm()
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install_luks()
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{
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msg info "installing LUKS"
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info "installing LUKS"
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install_binary cryptsetup
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# copy config
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printf "%s\n" \
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luks="$luks" \
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luks_root="$luks_root" \
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luks_opts="$luks_opts" \
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>> "${workdir}/etc/config"
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# avoid libgcc_s.so.1 missing error
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# see https://bugs.archlinux.org/task/56771
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[ -e /usr/lib/libgcc_s.so.1 ] &&
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install_library /usr/lib/libgcc_s.so.1
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[ -e /usr/lib/libgcc_s.so.1 ] && install_library /usr/lib/libgcc_s.so.1
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# word splitting is safe by design
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# shellcheck disable=2086
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{ IFS=,; set -- $luks_opts; IFS="$OLD_IFS"; }
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for opt; do
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case "${opt%%=*}" in
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for opt; do case "${opt%%=*}" in
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header)
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install -m400 "${opt##*=}" "${workdir}/root/header"
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luks_opts=$(printf "%s" "$luks_opts" | sed "s|${opt##*=}|/root/header|")
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@ -273,8 +280,7 @@ install_luks()
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install -m400 "${opt##*=}" "${workdir}/root/key"
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luks_opts=$(printf "%s" "$luks_opts" | sed "s|${opt##*=}|/root/key|")
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;;
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esac
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done
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esac; done
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}
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install_module()
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@ -303,7 +309,7 @@ install_module()
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install_hostonly_modules()
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{
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msg info "installing hostonly modules"
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info "installing hostonly modules"
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# perform autodetection of modules via /sys
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find /sys -name modalias -exec sort -u {} + |
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@ -328,13 +334,12 @@ install_hostonly_modules()
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if [ "$root_type" ]; then
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install_module "$root_type"
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else
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while read -r _ _dir _type _ _ _ || [ "$root_type" ]; do
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[ "$_dir" = / ] &&
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{
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while read -r _ _dir _type _ _ _ || [ "$_dir" ]; do
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[ "$_dir" = / ] && {
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install_module "${root_type=$_type}"
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break
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}
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done < /proc/mounts || msg panic "failed to install root partition module"
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done < /proc/mounts || panic "failed to install root partition module"
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fi
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# install user specified modules if any
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@ -345,7 +350,7 @@ install_hostonly_modules()
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install_all_modules()
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{
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msg info "installing all modules"
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info "installing all modules"
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find \
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"${modker}/kernel/arch" \
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@ -381,18 +386,19 @@ install_binary()
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: no operation
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;;
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"")
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msg panic "$1 doesn't exist"
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panic "$1 doesn't exist"
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;;
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*)
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# word splitting is safe by design
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# shellcheck disable=2086
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{ IFS=:; set -- $PATH; IFS="$OLD_IFS"; }
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for _dir; do
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[ -x "${_dir}/${binary}" ] &&
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{
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[ -x "${_dir}/${binary}" ] && {
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binary="${_dir}/${binary}"
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break
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}
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done || msg panic "couldn't find external $1 binary"
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done || panic "couldn't find external $1 binary"
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;;
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esac
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@ -444,26 +450,26 @@ install_library()
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create_initramfs()
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{
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msg info "creating initramfs image"
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info "creating initramfs image"
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# TODO add uncompressed option
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# check if image already exist
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[ "$force" != 1 ] && [ -e "$output" ] &&
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msg panic "initramfs image already exist"
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panic "initramfs image already exist"
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(
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cd "$workdir"
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find . | cpio -oH newc | ${compress:-gzip -9}
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) > "$output" 2> /dev/null ||
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msg panic "failed to generate initramfs image"
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panic "failed to generate initramfs image"
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}
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# int main()
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{
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# check root
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[ "$(id -u)" = 0 ] || msg panic "must be run as root"
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[ "$(id -u)" = 0 ] || panic "must be run as root"
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parse_args "$@"
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prepare_environment
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@ -474,8 +480,8 @@ create_initramfs()
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trap '
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ret="$?"
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trap - EXIT INT
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[ "$debug" = 1 ] || remove_workdir
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[ "$ret" = 0 ] || msg panic "something went wrong"
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[ "$debug" != 1 ] && remove_workdir
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[ "$ret" != 0 ] && panic "something went wrong"
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' EXIT INT
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create_structure
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@ -485,8 +491,8 @@ create_initramfs()
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[ "$luks" = 1 ] && install_luks
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# check monolithic kernel
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[ "$monolith" != 1 ] && [ -d "$moddir" ] &&
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{
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[ "$monolith" != 1 ] && [ -d "$moddir" ] && {
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# check hostonly mode
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if [ "$hostonly" = 1 ]; then
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install_hostonly_modules
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@ -509,5 +515,5 @@ create_initramfs()
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install_requirements
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create_initramfs
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msg info "done! check out - $output"
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info "done! check out - $output"
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}
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@ -17,8 +17,7 @@ create_symlink()
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{
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[ "$MDEV" ] || exit 1
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for line in $(blkid "$MDEV"); do
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case "${line%%=*}" in
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for line in $(blkid "$MDEV"); do case "${line%%=*}" in
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UUID)
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dir="/dev/disk/by-uuid/"
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create_symlink "${line##*=}"
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@ -31,11 +30,9 @@ create_symlink()
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dir="/dev/disk/by-partuuid/"
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create_symlink "${line##*=}"
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;;
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esac
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done
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esac; done
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[ -e "/sys/block/${MDEV}/dm/name" ] &&
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{
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[ -e "/sys/block/${MDEV}/dm/name" ] && {
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mkdir -p /dev/mapper 2> /dev/null
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read -r name < "/sys/block/${MDEV}/dm/name"
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ln -s "/dev/${MDEV}" "/dev/mapper/${name}" 2> /dev/null
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@ -1,11 +1,18 @@
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#!/bin/sh -ef
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#
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# tiny init
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#
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# word splitting is safe by design
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# shellcheck disable=2068,2046,2086
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#
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# false positive
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# shellcheck disable=2154,2163,1091
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panic()
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panic() { printf "panic >> %s\n" "$1" >&2; shell; }
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info() { printf "info >> %s\n" "$1"; shell; }
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shell()
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{
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printf "panic >> %s\n" "$1"
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# see https://busybox.net/FAQ.html#job_control
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setsid sh -c "exec sh <> /dev/${console:-console} 2>&1" || sh
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}
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@ -31,9 +38,8 @@ findfs()
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# avoid race condition
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while [ ! -e "$device" ]; do
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value=$(( value + 1 ))
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[ "$value" = 15 ] && panic "failed to lookup partition"
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sleep 1
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value=$(( value + 1 )); sleep 1
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done
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}
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@ -68,12 +74,9 @@ prepare_environment()
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parse_cmdline()
|
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{
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[ "$break" = cmdline ] && panic "break before parse cmdline"
|
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|
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read -r cmdline < /proc/cmdline
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for line in $cmdline; do
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case "$line" in
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for line in $cmdline; do case "$line" in
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debug | debug=1)
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set -x
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;;
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@ -90,13 +93,12 @@ parse_cmdline()
|
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*)
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export "${line}=1"
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;;
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esac
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done
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esac; done
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}
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setup_devmgr()
|
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{
|
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[ "$break" = devmgr ] && panic "break before setup device manager"
|
||||
[ "$break" = devmgr ] && info "break before setup device manager"
|
||||
|
||||
case "$devmgr" in
|
||||
udev)
|
||||
@ -108,8 +110,7 @@ setup_devmgr()
|
||||
mdev)
|
||||
mdev -df 2> /dev/null & mdev_pid="$!"
|
||||
|
||||
[ "$monolith" != 1 ] &&
|
||||
{
|
||||
[ "$monolith" != 1 ] && {
|
||||
set -- $(find /sys -name modalias -type f -exec sort -u {} +)
|
||||
modprobe -a "$@" 2> /dev/null
|
||||
}
|
||||
@ -123,12 +124,11 @@ setup_devmgr()
|
||||
|
||||
unlock_luks()
|
||||
{
|
||||
[ "$break" = luks ] && panic "break before unlock LUKS"
|
||||
[ "$break" = luks ] && info "break before unlock LUKS"
|
||||
|
||||
{ IFS=,; set -- $luks_opts; IFS="$OLD_IFS"; }
|
||||
|
||||
for opt; do
|
||||
case "$opt" in
|
||||
for opt; do case "$opt" in
|
||||
discard | discard=1)
|
||||
luks_discard="--allow-discards"
|
||||
;;
|
||||
@ -141,23 +141,28 @@ unlock_luks()
|
||||
key=*)
|
||||
luks_key="-d ${opt##*=}"
|
||||
;;
|
||||
esac
|
||||
done
|
||||
esac; done
|
||||
|
||||
findfs "$luks_root"
|
||||
|
||||
set -- "--disable-locks" "$luks_key" "$luks_header" "$luks_discard" "$device" "${luks_name:-luks-${device##*/}}"
|
||||
set -- \
|
||||
"--disable-locks" \
|
||||
"$luks_key" \
|
||||
"$luks_header" \
|
||||
"$luks_discard" \
|
||||
"$device" \
|
||||
"${luks_name:-luks-${device##*/}}"
|
||||
|
||||
cryptsetup open $@ || panic "failed to unlock LUKS"
|
||||
}
|
||||
|
||||
trigger_lvm()
|
||||
{
|
||||
[ "$break" = lvm ] && panic "break before trigger LVM"
|
||||
[ "$break" = lvm ] && info "break before trigger LVM"
|
||||
|
||||
{ IFS=,; set -- $lvm_opts; IFS="$OLD_IFS"; }
|
||||
|
||||
for opt; do
|
||||
case "$opt" in
|
||||
for opt; do case "$opt" in
|
||||
discard | discard=1)
|
||||
lvm_discard="--config=devices{issue_discards=1}"
|
||||
;;
|
||||
@ -173,8 +178,7 @@ trigger_lvm()
|
||||
tag=*)
|
||||
lvm_tag="@${opt##*=}"
|
||||
;;
|
||||
esac
|
||||
done
|
||||
esac; done
|
||||
|
||||
set -- "--sysinit" "-qq" "-ay" "$lvm_discard"
|
||||
|
||||
@ -191,17 +195,21 @@ trigger_lvm()
|
||||
|
||||
mount_root()
|
||||
{
|
||||
[ "$break" = root ] && panic "break before mount root"
|
||||
[ "$break" = root ] && info "break before mount root"
|
||||
|
||||
findfs "$root"
|
||||
|
||||
set -- "${root_type:+-t $root_type}" "${rorw:-o ro}${root_opts:+,$root_opts}" "$device" "/mnt/root"
|
||||
set -- \
|
||||
"${root_type:+-t $root_type}" \
|
||||
"${rorw:--o ro}${root_opts:+,$root_opts}" \
|
||||
"$device" "/mnt/root"
|
||||
|
||||
mount $@ || panic "failed to mount root"
|
||||
}
|
||||
|
||||
cleanup()
|
||||
{
|
||||
[ "$break" = cleanup ] && panic "break before cleanup"
|
||||
[ "$break" = cleanup ] && info "break before cleanup"
|
||||
|
||||
case "$devmgr" in
|
||||
udev) udevadm control -e ;;
|
||||
@ -209,7 +217,7 @@ cleanup()
|
||||
mdevd) kill "$mdevd_pid" ;;
|
||||
esac
|
||||
|
||||
# temporary workaround until util-linux mount implements 'mount -o move'
|
||||
# temporary workaround until util-linux release a new version
|
||||
# see https://github.com/karelzak/util-linux/issues/997
|
||||
for dir in dev sys proc; do
|
||||
mount -o move "$dir" "/mnt/root/${dir}" || mount --move "$dir" "/mnt/root/${dir}"
|
||||
@ -218,7 +226,7 @@ cleanup()
|
||||
|
||||
boot_system()
|
||||
{
|
||||
[ "$break" = boot ] && panic "break before boot system"
|
||||
[ "$break" = boot ] && info "break before boot system"
|
||||
|
||||
set -- "/mnt/root" "${init:-/sbin/init}"
|
||||
exec switch_root $@ 2> /dev/null || panic "failed to boot system"
|
||||
@ -230,6 +238,8 @@ boot_system()
|
||||
parse_cmdline
|
||||
setup_devmgr
|
||||
|
||||
# trigger lvm twice to handle both LUKS on LVM and LVM on LUKS
|
||||
[ "$lvm" = 1 ] && trigger_lvm
|
||||
[ "$luks" = 1 ] && unlock_luks
|
||||
[ "$lvm" = 1 ] && trigger_lvm
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user