modules.d/99shutdown/shutdown.sh

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4 #
   5 # Licensed under the GPLv2
   6 #
   7 # Copyright 2011, Red Hat, Inc.
   8 # Harald Hoyer <harald@redhat.com>
   9 ACTION="$1"
  10
  11 [ -w /dev/console ] && exec </dev/console >>/dev/console 2>>/dev/console
  12
  13 export TERM=linux
  14 export PATH=/usr/sbin:/usr/bin:/sbin:/bin
  15 . /lib/dracut-lib.sh
  16
  17 mkdir /oldsys
  18 for i in sys proc run dev; do
  19     mkdir /oldsys/$i
  20     mount --move /oldroot/$i /oldsys/$i
  21 done
  22
  23 # if "kexec" was installed after creating the initramfs, we try to copy it from the real root
  24 # libz normally is pulled in via kmod/modprobe and udevadm
  25 if [ "$ACTION" = "kexec" ] && ! command -v kexec >/dev/null 2>&1; then
  26     for p in /usr/sbin /usr/bin /sbin /bin; do
  27         cp -a /oldroot/${p}/kexec $p >/dev/null 2>&1 && break
  28     done
  29     hash kexec
  30 fi
  31
  32 trap "emergency_shell --shutdown shutdown Signal caught!" 0
  33 getarg 'rd.break=pre-shutdown' && emergency_shell --shutdown pre-shutdown "Break before pre-shutdown"
  34
  35 source_hook pre-shutdown
  36
  37 warn "Killing all remaining processes"
  38
  39 killall_proc_mountpoint /oldroot
  40
  41 umount_a() {
  42     local _did_umount="n"
  43     while read a mp a; do
  44         if strstr "$mp" oldroot; then
  45             if umount "$mp"; then
  46                 _did_umount="y"
  47                 warn "Unmounted $mp."
  48             fi
  49         fi
  50     done </proc/mounts
  51     losetup -D
  52     [ "$_did_umount" = "y" ] && return 0
  53     return 1
  54 }
  55
  56 _cnt=0
  57 while [ $_cnt -le 40 ]; do
  58     umount_a 2>/dev/null || break
  59     _cnt=$(($_cnt+1))
  60 done
  61
  62 [ $_cnt -ge 40 ] && umount_a
  63
  64 if strstr "$(cat /proc/mounts)" "/oldroot"; then
  65     warn "Cannot umount /oldroot"
  66     for _pid in /proc/*; do
  67         _pid=${_pid##/proc/}
  68         case $_pid in
  69             *[!0-9]*) continue;;
  70         esac
  71         [ -e /proc/$_pid/exe ] || continue
  72         [ -e /proc/$_pid/root ] || continue
  73         if strstr "$(ls -l /proc/$_pid /proc/$_pid/fd 2>/dev/null)" "oldroot"; then
  74             warn "Blocking umount of /oldroot [$_pid] $(cat /proc/$_pid/cmdline)"
  75         elif [ $_pid -ne $$ ]; then
  76             warn "Still running [$_pid] $(cat /proc/$_pid/cmdline)"
  77         fi
  78         ls -l /proc/$_pid/fd 2>&1 | vwarn
  79     done
  80 fi
  81
  82 _check_shutdown() {
  83     local __f
  84     local __s=1
  85     for __f in $hookdir/shutdown/*.sh; do
  86         [ -e "$__f" ] || continue
  87         ( . "$__f" $1 )
  88         if [ $? -eq 0 ]; then
  89             rm -f $__f
  90             __s=0
  91         fi
  92     done
  93     return $__s
  94 }
  95
  96 while _check_shutdown; do
  97 :
  98 done
  99 _check_shutdown final
 100
 101 getarg 'rd.break=shutdown' && emergency_shell --shutdown shutdown "Break before shutdown"
 102
 103 case "$ACTION" in
 104     reboot|poweroff|halt)
 105         $ACTION -f -d -n
 106         warn "$ACTION failed!"
 107         ;;
 108     kexec)
 109         kexec -e
 110         warn "$ACTION failed!"
 111         ;;
 112     *)
 113         warn "Shutdown called with argument '$ACTION'. Rebooting!"
 114         reboot -f -d -n
 115         ;;
 116 esac
 117
 118 emergency_shell --shutdown shutdown