redesign code style and fix some issues
This commit is contained in:
illiliti
@@ -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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@@ -68,35 +74,31 @@ 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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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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debug | debug=1)
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set -x
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;;
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ro | rw)
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rorw="-o $line"
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;;
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*.*)
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# TODO implement backward compatibilty with dracut, mkinitcpio, etc
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: no operation
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;;
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*=*)
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export "$line"
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;;
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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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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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ro | rw)
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rorw="-o $line"
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;;
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*.*)
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# TODO implement backward compatibilty with dracut, mkinitcpio, etc
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: no operation
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;;
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*=*)
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export "$line"
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;;
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*)
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export "${line}=1"
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;;
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esac; done
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}
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setup_devmgr()
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{
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[ "$break" = devmgr ] && panic "break before setup device manager"
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[ "$break" = devmgr ] && info "break before setup device manager"
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case "$devmgr" in
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udev)
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@@ -108,8 +110,7 @@ setup_devmgr()
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mdev)
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mdev -df 2> /dev/null & mdev_pid="$!"
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[ "$monolith" != 1 ] &&
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{
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[ "$monolith" != 1 ] && {
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set -- $(find /sys -name modalias -type f -exec sort -u {} +)
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modprobe -a "$@" 2> /dev/null
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}
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@@ -123,58 +124,61 @@ setup_devmgr()
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unlock_luks()
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{
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[ "$break" = luks ] && panic "break before unlock LUKS"
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[ "$break" = luks ] && info "break before unlock LUKS"
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{ IFS=,; set -- $luks_opts; IFS="$OLD_IFS"; }
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for opt; do
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case "$opt" in
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discard | discard=1)
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luks_discard="--allow-discards"
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;;
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header=*)
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luks_header="--${opt}"
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;;
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name=*)
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luks_name="${opt##*=}"
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;;
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key=*)
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luks_key="-d ${opt##*=}"
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;;
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esac
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done
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for opt; do case "$opt" in
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discard | discard=1)
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luks_discard="--allow-discards"
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;;
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header=*)
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luks_header="--${opt}"
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;;
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name=*)
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luks_name="${opt##*=}"
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;;
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key=*)
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luks_key="-d ${opt##*=}"
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;;
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esac; done
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findfs "$luks_root"
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set -- "--disable-locks" "$luks_key" "$luks_header" "$luks_discard" "$device" "${luks_name:-luks-${device##*/}}"
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set -- \
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"--disable-locks" \
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"$luks_key" \
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"$luks_header" \
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"$luks_discard" \
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"$device" \
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"${luks_name:-luks-${device##*/}}"
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cryptsetup open $@ || panic "failed to unlock LUKS"
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}
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trigger_lvm()
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{
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[ "$break" = lvm ] && panic "break before trigger LVM"
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[ "$break" = lvm ] && info "break before trigger LVM"
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{ IFS=,; set -- $lvm_opts; IFS="$OLD_IFS"; }
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for opt; do
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case "$opt" in
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discard | discard=1)
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lvm_discard="--config=devices{issue_discards=1}"
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;;
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config=0)
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:> /etc/lvm/lvm.conf
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;;
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group=*)
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lvm_group="${opt##*=}"
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;;
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name=*)
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lvm_name="/${opt##*=}"
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;;
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tag=*)
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lvm_tag="@${opt##*=}"
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;;
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esac
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done
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for opt; do case "$opt" in
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discard | discard=1)
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lvm_discard="--config=devices{issue_discards=1}"
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;;
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config=0)
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:> /etc/lvm/lvm.conf
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;;
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group=*)
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lvm_group="${opt##*=}"
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;;
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name=*)
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lvm_name="/${opt##*=}"
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;;
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tag=*)
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lvm_tag="@${opt##*=}"
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;;
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esac; done
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set -- "--sysinit" "-qq" "-ay" "$lvm_discard"
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@@ -191,17 +195,21 @@ trigger_lvm()
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mount_root()
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{
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[ "$break" = root ] && panic "break before mount root"
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[ "$break" = root ] && info "break before mount root"
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findfs "$root"
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set -- "${root_type:+-t $root_type}" "${rorw:-o ro}${root_opts:+,$root_opts}" "$device" "/mnt/root"
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set -- \
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"${root_type:+-t $root_type}" \
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"${rorw:--o ro}${root_opts:+,$root_opts}" \
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"$device" "/mnt/root"
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mount $@ || panic "failed to mount root"
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}
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cleanup()
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{
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[ "$break" = cleanup ] && panic "break before cleanup"
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[ "$break" = cleanup ] && info "break before cleanup"
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case "$devmgr" in
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udev) udevadm control -e ;;
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@@ -209,7 +217,7 @@ cleanup()
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mdevd) kill "$mdevd_pid" ;;
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esac
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# temporary workaround until util-linux mount implements 'mount -o move'
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# temporary workaround until util-linux release a new version
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# see https://github.com/karelzak/util-linux/issues/997
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for dir in dev sys proc; do
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mount -o move "$dir" "/mnt/root/${dir}" || mount --move "$dir" "/mnt/root/${dir}"
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@@ -218,7 +226,7 @@ cleanup()
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boot_system()
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{
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[ "$break" = boot ] && panic "break before boot system"
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[ "$break" = boot ] && info "break before boot system"
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set -- "/mnt/root" "${init:-/sbin/init}"
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exec switch_root $@ 2> /dev/null || panic "failed to boot system"
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@@ -230,6 +238,8 @@ boot_system()
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parse_cmdline
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setup_devmgr
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# trigger lvm twice to handle both LUKS on LVM and LVM on LUKS
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[ "$lvm" = 1 ] && trigger_lvm
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[ "$luks" = 1 ] && unlock_luks
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[ "$lvm" = 1 ] && trigger_lvm
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