diff options
Diffstat (limited to 'modules.d/99shutdown/shutdown.sh')
| -rwxr-xr-x | modules.d/99shutdown/shutdown.sh | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/modules.d/99shutdown/shutdown.sh b/modules.d/99shutdown/shutdown.sh new file mode 100755 index 0000000..d611d44 --- /dev/null +++ b/modules.d/99shutdown/shutdown.sh @@ -0,0 +1,176 @@ +#!/bin/sh +# +# Licensed under the GPLv2 +# +# Copyright 2011, Red Hat, Inc. +# Harald Hoyer <harald@redhat.com> +ACTION="$1" + +# Before trying to use /dev/console, verify that it exists, +# and that it can actually be used. When console=null is used, +# echo will fail. We do the check in a subshell, because otherwise +# the process will be killed when when running as PID 1. +# shellcheck disable=SC2217 +[ -w /dev/console ] \ + && (echo < /dev/console > /dev/null 2> /dev/null) \ + && exec < /dev/console >> /dev/console 2>> /dev/console + +export TERM=linux +export PATH=/usr/sbin:/usr/bin:/sbin:/bin +. /lib/dracut-lib.sh + +if [ "$(stat -c '%T' -f /)" = "tmpfs" ]; then + mount -o remount,rw / +fi + +mkdir -p /oldsys +for i in sys proc run dev; do + mkdir -p /oldsys/$i + mount --move /oldroot/$i /oldsys/$i +done + +# if "kexec" was installed after creating the initramfs, we try to copy it from the real root +# libz normally is pulled in via kmod/modprobe and udevadm +if [ "$ACTION" = "kexec" ] && ! command -v kexec > /dev/null 2>&1; then + for p in /usr/sbin /usr/bin /sbin /bin; do + cp -a /oldroot/${p}/kexec $p > /dev/null 2>&1 && break + done + hash kexec +fi + +trap "emergency_shell --shutdown shutdown Signal caught!" 0 +getarg 'rd.break=pre-shutdown' && emergency_shell --shutdown pre-shutdown "Break before pre-shutdown" + +source_hook pre-shutdown + +warn "Killing all remaining processes" + +killall_proc_mountpoint /oldroot || sleep 0.2 + +# Timeout for umount calls. The value can be set to 0 to wait forever. +_umount_timeout=$(getarg rd.shutdown.timeout.umount) +_umount_timeout=${_umount_timeout:-90s} +_timed_out_umounts="" + +umount_a() { + local _verbose="n" + if [ "$1" = "-v" ]; then + _verbose="y" + shift + exec 7>&2 + else + exec 7> /dev/null + fi + + local _did_umount="n" + while read -r _ mp _ || [ -n "$mp" ]; do + strstr "$mp" oldroot || continue + strstr "$_timed_out_umounts" " $mp " && continue + + # Unmount the file system. The operation uses a timeout to avoid waiting + # indefinitely if this is e.g. a stuck NFS mount. The command is + # invoked in a subshell to silence also the "Killed" message that might + # be produced by the shell. + ( + set +m + timeout --signal=KILL "$_umount_timeout" umount "$mp" + ) 2>&7 + local ret=$? + if [ $ret -eq 0 ]; then + _did_umount="y" + warn "Unmounted $mp." + elif [ $ret -eq 137 ]; then + _timed_out_umounts="$_timed_out_umounts $mp " + warn "Unmounting $mp timed out." + elif [ "$_verbose" = "y" ]; then + warn "Unmounting $mp failed with status $ret." + fi + done < /proc/mounts + + losetup -D 2>&7 + + exec 7>&- + [ "$_did_umount" = "y" ] && return 0 + return 1 +} + +_cnt=0 +while [ $_cnt -le 40 ]; do + umount_a || break + _cnt=$((_cnt + 1)) +done + +[ $_cnt -ge 40 ] && umount_a -v + +if strstr "$(cat /proc/mounts)" "/oldroot"; then + warn "Cannot umount /oldroot" + for _pid in /proc/*; do + _pid=${_pid##/proc/} + case $_pid in + *[!0-9]*) continue ;; + esac + [ "$_pid" -eq $$ ] && continue + + [ -e "/proc/$_pid/exe" ] || continue + [ -e "/proc/$_pid/root" ] || continue + + if strstr "$(ls -l /proc/"$_pid" /proc/"$_pid"/fd 2> /dev/null)" "oldroot"; then + warn "Blocking umount of /oldroot [$_pid] $(cat /proc/"$_pid"/cmdline)" + else + warn "Still running [$_pid] $(cat /proc/"$_pid"/cmdline)" + fi + + # shellcheck disable=SC2012 + ls -l "/proc/$_pid/exe" 2>&1 | vwarn + # shellcheck disable=SC2012 + ls -l "/proc/$_pid/fd" 2>&1 | vwarn + done +fi + +_check_shutdown() { + local __f + local __s=0 + for __f in "$hookdir"/shutdown/*.sh; do + [ -e "$__f" ] || continue + # shellcheck disable=SC1090 disable=SC2240 + if (final="$1" . "$__f" "$1"); then + rm -f -- "$__f" + else + __s=1 + fi + done + return $__s +} + +_cnt=0 +while [ $_cnt -le 40 ]; do + _check_shutdown && break + _cnt=$((_cnt + 1)) +done +[ $_cnt -ge 40 ] && _check_shutdown final + +if type plymouth > /dev/null 2>&1; then + plymouth --hide-splash +elif [ -x /oldroot/bin/plymouth ]; then + /oldroot/bin/plymouth --hide-splash +fi + +getarg 'rd.break=shutdown' && emergency_shell --shutdown shutdown "Break before shutdown" + +case "$ACTION" in + reboot | poweroff | halt) + $ACTION -f -n + warn "$ACTION failed!" + ;; + kexec) + kexec -e + warn "$ACTION failed!" + reboot -f -n + ;; + *) + warn "Shutdown called with argument '$ACTION'. Rebooting!" + reboot -f -n + ;; +esac + +emergency_shell --shutdown shutdown |