summaryrefslogtreecommitdiff
path: root/source/a/mkinitrd/init
blob: 0559932e97bd239d61a70e279cd00d8f39bc4307 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
#!/bin/ash
#
# /init:  init script to load kernel modules from an initramfs
#         This requires that your kernel supports initramfs!!!
#
# Copyright 2004  Slackware Linux, Inc., Concord, CA, USA
# Copyright 2007, 2008  Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


# With a generic kernel, you need to load the modules needed to mount the
# root partition.  This might mean a SCSI, RAID, or other drive controller
# module, as well as the module to support the root filesystem.  Once the
# root partition is mounted all the other modules will be available so you
# don't need to load them here.
#
# Config files used by this script:
#
# /rootdev   Contains the name of the root device, such as: /dev/hda1 
#
# /rootfs    Contains the root filesystem type, such as: xfs
#
# /initrd-name    Contains the name of the initrd file.
#
# Optional:
# /load_kernel_modules   A script that uses insmod to load the desired
#            modules.  If this file is not present, all the modules
#            in /lib/modules/`uname -r`/ will be loaded in the usual
#            sorted order.  If you need to load the modules in a
#            certain order, or if the modules need extra options,
#            then use a load_kernel_modules script.
#
#            There's an example in here.  To actually use it, you'll
#            need to make it executable:  
#
#                chmod 755 load_kernel_modules

INITRD=`cat /initrd-name`
ROOTDEV=`cat /rootdev`
ROOTFS=`cat /rootfs`
LUKSDEV=`cat /luksdev`
RESUMEDEV=`cat /resumedev`
WAIT=`cat /wait-for-root`
KEYMAP=`cat /keymap`

# Mount /proc and /sys:
mount -n proc /proc -t proc
mount -n sysfs /sys -t sysfs

# Parse command line
for ARG in `cat /proc/cmdline`; do
  case $ARG in
    rescue)
      RESCUE=1
    ;;
    root=/dev/*)
      ROOTDEV=`echo $ARG | cut -f2 -d=`
    ;;
    rootfs=*)
      ROOTFS=`echo $ARG | cut -f2 -d=`
    ;;
    luksdev=/dev/*)
      LUKSDEV=`echo $ARG | cut -f2 -d=`
    ;;
    waitforroot=*)
      WAIT=`echo $ARG | cut -f2 -d=`
    ;;
    root=LABEL=*)
      ROOTDEV=`echo $ARG | cut -f2- -d=`
    ;;
    resume=*)
      RESUMEDEV=`echo $ARG | cut -f2 -d=`
    ;;
    0|1|2|3|4|5|6)
      RUNLEVEL=$ARG
    ;;
  esac
done

# Load kernel modules:
if [ ! -d /lib/modules/`uname -r` ]; then
  echo "No kernel modules found for Linux `uname -r`."
elif [ -x ./load_kernel_modules ]; then # use load_kernel_modules script:
  echo "${INITRD}:  Loading kernel modules from initrd image:"
  . ./load_kernel_modules
else # load modules (if any) in order:
  if ls /lib/modules/`uname -r`/*.*o 1> /dev/null 2> /dev/null ; then
    echo "${INITRD}:  Loading kernel modules from initrd image:"
    for module in /lib/modules/`uname -r`/*.*o ; do
      insmod $module
    done
    unset module
  fi
fi

# Sometimes the devices needs extra time to be available.
# root on USB are good example of that.
sleep $WAIT

# If udevd is available, use it to generate block devices
# else use mdev to read sysfs and generate the needed devices 
if [ -x /sbin/udevd -a -x /sbin/udevadm ]; then
  /sbin/udevd --daemon
  /sbin/udevadm trigger --subsystem-match=block
  /sbin/udevadm settle --timeout=10
else
  mdev -s
fi

# Load a custom keyboard mapping:
if [ -n "$KEYMAP" ]; then
  echo "${INITRD}:  Loading '$KEYMAP' keyboard mapping:"
  tar xzOf /etc/keymaps.tar.gz ${KEYMAP}.bmap | loadkmap
fi

if [ "$RESCUE" = "" ]; then 
  # Initialize RAID:
  if [ -x /sbin/mdadm ]; then
    /sbin/mdadm -E -s >/etc/mdadm.conf
    /sbin/mdadm -A -s
  fi
  
  # Find root device if a label was given:
  if echo $ROOTDEV | grep -q "LABEL=" ; then
    ROOTDEV=`findfs $ROOTDEV`
  fi

  # Make encrypted root partition available:
  # The useable device will be under /dev/mapper/
  # Three scenarios for the commandline exist:
  # 1- ROOTDEV is on a LUKS volume, and LUKSDEV is a real block device
  # 2- ROOTDEV is on a LVM volume, and LUKSDEV is a real block device
  # 3- ROOTDEV is on a LUKS volume, and LUKSDEV is on a LVM volume
  # Case (3) will have to wait until we initialize the LVM.
  # Test if ROOTDEV is "/dev/someting" or just "something" - the first means
  # ROOTDEV is on a LVM volume (scenario 2); we don't need to rewrite ROOTDEV.
  # The second means that ROOTDEV is on a LUKS volume (scenario 1).
  CRYPTDEV=""
  if [ -x /sbin/cryptsetup ]; then
    # If we find a LUKS device now, it is on a real block device: 
    if /sbin/cryptsetup isLuks ${LUKSDEV} 1>/dev/null 2>/dev/null ; then
      CRYPTDEV=$(basename $ROOTDEV)
      echo "Unlocking LUKS crypt volume '${CRYPTDEV}' on device '$LUKSDEV':"
      /sbin/cryptsetup luksOpen ${LUKSDEV} $CRYPTDEV </dev/systty >/dev/systty 2>&1
      if [ "$CRYPTDEV" == "$ROOTDEV" ]; then # scenario 1
        ROOTDEV="/dev/mapper/${CRYPTDEV}"
      fi
    fi
  fi

  # Initialize LVM:
  if [ -x /sbin/vgscan ]; then
    /sbin/vgscan --mknodes --ignorelockingfailure
    sleep 10
    /sbin/vgchange -ay --ignorelockingfailure
  fi
  
  # Make encrypted root partition available (scenario 3):
  # We have to handle cases here where the LUKS volume is created on a LV
  if [ -x /sbin/cryptsetup ]; then
    if /sbin/cryptsetup isLuks ${LUKSDEV} 1>/dev/null 2>/dev/null ; then
      # Only act if we could not open the LUKS device before (i.e. is on a LV):
      if [ "x$CRYPTDEV" == "x" ]; then
        echo "Unlocking LUKS crypt volume '${ROOTDEV}' on device '$LUKSDEV':"
        /sbin/cryptsetup luksOpen ${LUKSDEV} $ROOTDEV </dev/systty >/dev/systty 2>&1
        ROOTDEV="/dev/mapper/${ROOTDEV}"
      fi
    fi
  fi

  # Resume state from swap
  if [ "$RESUMEDEV" != "" ]; then
    if ls -l $RESUMEDEV | grep -q "^l" ; then
      RESUMEDEV=`ls -l $RESUMEDEV | awk '{ print $NF }'`
    fi
    echo "Trying to resume from $RESUMEDEV"
    RESMAJMIN=`ls -l $RESUMEDEV | tr , : | awk '{ print $5$6 }'`
    echo $RESMAJMIN > /sys/power/resume
  fi
  
  # Switch to real root partition:
  echo 0x0100 > /proc/sys/kernel/real-root-dev
  mount -o ro -t $ROOTFS $ROOTDEV /mnt
  
  if [ ! -r /mnt/sbin/init ]; then
    echo "ERROR:  No /sbin/init found on rootdev (or not mounted).  Trouble ahead."
    echo "        You can try to fix it. Type 'exit' when things are done." 
    echo
    /bin/sh
  fi
else
  echo "RESCUE mode"
  echo
  echo "        You can try to fix or rescue your system now. If you want"
  echo "        to boot into your fixed system, mount your root filesystem"
  echo "        read-only under /mnt:"
  echo
  echo "            # mount -o ro -t filesystem root_device /mnt"
  echo
  echo "        Type 'exit' when things are done."
  echo
  /bin/sh
fi

if ps axc | grep -q udevd ; then
  killall udevd
fi

unset ERR
umount /proc
umount /sys
echo "${INITRD}:  exiting"
exec switch_root /mnt /sbin/init $RUNLEVEL