package/base/mkinitrd/initrdinit.sh

   1 #!/bin/sh
   2
   3 PATH=/sbin:/bin:/usr/bin:/usr/sbin
   4
   5 echo "T2 SDE early userspace (c)2005-2021 Rene Rebe, ExactCODE GmbH; Germany."
   6
   7 function boot {
   8         mount -t none -o move {,/mnt}/dev
   9         mount -t none -o move {,/mnt}/proc
  10         mount -t none -o move {,/mnt}/sys
  11         exec switch_root /mnt $init $*
  12 }
  13
  14 echo "Mounting /dev, /proc and /sys"
  15 mount -t devtmpfs -o mode=755 none /dev
  16 mount -t proc none /proc
  17 mount -t sysfs none /sys
  18 mkdir -p /tmp /mnt
  19 ln -s /proc/self/fd /dev/fd
  20
  21 echo "$(< /proc/sys/kernel/ostype) $(< /proc/sys/kernel/osrelease)," \
  22 "populating u/dev"
  23 udevd &
  24 udevadm trigger
  25 udevadm settle
  26
  27 # get the root device, init, early swap
  28 cmdline="$(< /proc/cmdline)"
  29 root="root= $cmdline" ; root=${root##*root=} ; root=${root%% *}
  30 init="init= $cmdline" ; init=${init##*init=} ; init=${init%% *}
  31 swap="swap= $cmdline" ; swap=${swap##*swap=} ; swap=${swap%% *}
  32
  33 [ "${root#UUID=}" != "$root" ] && root="/dev/disk/by-uuid/${root#UUID=}"
  34 [ "${swap#UUID=}" != "$swap" ] && swap="/dev/disk/by-uuid/${swap#UUID=}"
  35
  36 # maybe resume from disk?
  37 resume="$(< /proc/cmdline)"
  38 if [[ "$resume" = *resume* ]] && [[ "$resume" != *noresume* ]]; then
  39         resume=${resume##*resume=} ; resume=${resume%% *}
  40         resume=`ls -l $resume |
  41 sed 's/[^ ]* *[^ t]* *[^ ]* *[^ ]* *\([0-9]*\), *\([0-9]*\) .*/\1:\2/'`
  42         echo "Attempting to resume from disk $resume."
  43         echo "$resume" > /sys/power/resume
  44 fi
  45
  46 if [ "$swap" ]; then
  47         echo "Activating swap"
  48         swapon $swap
  49 fi
  50
  51 if [ "$root" ]; then
  52   mountopt="ro"
  53
  54   # diskless network root?
  55   addr="${root%:*}"
  56   if [ "$addr" != "$root" ]; then
  57     mountopt="$mountopt,nolock,port=2049,mountport=32790,vers=4,addr=$addr"
  58     filesystems="nfs"
  59     ipconfig eth0
  60   else
  61     unset addr
  62     if [ ! -e "$root" ]; then
  63         echo "Activating RAID & LVM"
  64         [ -e /sbin/mdadm ] && mdadm --assemble --scan
  65         [ -e /sbin/lvchange ] && lvchange -a ay ${root#/dev/}
  66     fi
  67     if [ ! -e "$root" ]; then
  68         modprobe pata_legacy
  69     fi
  70   fi
  71
  72   echo "Mounting root $mountopt"
  73
  74   i=0
  75   while [ $i -le 9 ]; do
  76     if [ -e $root -o "$addr" ]; then
  77         if [ -z "$addr" ]; then
  78           type -p cryptsetup && cryptsetup isLuks $root --disable-locks &&
  79                   cryptsetup luksOpen $root root --disable-locks && root=/dev/mapper/root
  80
  81           # try best match / detected root first, all the others thereafter
  82           filesystems=`disktype $root 2>/dev/null |
  83             sed -e '/file system/!d' -e 's/file system.*//' -e 's/ //g' \
  84                 -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/' \
  85                 -e 's/fat32/vfat/'
  86             sed '/^nodev/d' /proc/filesystems | sed '1!G; $p; h; d'`
  87         fi
  88         for fs in $filesystems; do
  89           if mount -t $fs -o $mountopt $root /mnt 2> /dev/null; then
  90                 echo "Successfully mounted root as $fs."
  91                 # TODO: later on search other places if we want 100% backward compat?
  92                 init=${init:-/sbin/init}
  93                 if [ -f /mnt$init ]; then
  94                         kill %1
  95                         boot $init $*
  96                 else
  97                         echo "Specified init ($init) does not exist!"
  98                 fi
  99                 break 2
 100           fi
 101         done
 102     fi
 103   [ $(( i++ )) -eq 0 ] && echo "Waiting for root device to become ready."
 104   sleep 1
 105   done
 106 fi
 107
 108 # PANICMARK
 109
 110 echo "No root or init, but we do not scream, debug shell:"
 111 kill %1
 112
 113 exec /bin/sh