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-rw-r--r--meta/recipes-core/initrdscripts/files/init-live.sh223
1 files changed, 223 insertions, 0 deletions
diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh
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1#!/bin/sh
2
3PATH=/sbin:/bin:/usr/sbin:/usr/bin
4
5ROOT_MOUNT="/rootfs/"
6ROOT_IMAGE="rootfs.img"
7MOUNT="/bin/mount"
8UMOUNT="/bin/umount"
9ISOLINUX=""
10
11# Copied from initramfs-framework. The core of this script probably should be
12# turned into initramfs-framework modules to reduce duplication.
13udev_daemon() {
14 OPTIONS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd"
15
16 for o in $OPTIONS; do
17 if [ -x "$o" ]; then
18 echo $o
19 return 0
20 fi
21 done
22
23 return 1
24}
25
26_UDEV_DAEMON=`udev_daemon`
27
28early_setup() {
29 mkdir -p /proc
30 mkdir -p /sys
31 mount -t proc proc /proc
32 mount -t sysfs sysfs /sys
33 mount -t devtmpfs none /dev
34
35 # support modular kernel
36 modprobe isofs 2> /dev/null
37
38 mkdir -p /run
39 mkdir -p /var/run
40
41 $_UDEV_DAEMON --daemon
42 udevadm trigger --action=add
43}
44
45read_args() {
46 [ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
47 for arg in $CMDLINE; do
48 optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
49 case $arg in
50 root=*)
51 ROOT_DEVICE=$optarg ;;
52 rootimage=*)
53 ROOT_IMAGE=$optarg ;;
54 rootfstype=*)
55 modprobe $optarg 2> /dev/null ;;
56 LABEL=*)
57 label=$optarg ;;
58 video=*)
59 video_mode=$arg ;;
60 vga=*)
61 vga_mode=$arg ;;
62 console=*)
63 if [ -z "${console_params}" ]; then
64 console_params=$arg
65 else
66 console_params="$console_params $arg"
67 fi ;;
68 debugshell*)
69 if [ -z "$optarg" ]; then
70 shelltimeout=30
71 else
72 shelltimeout=$optarg
73 fi
74 esac
75 done
76}
77
78boot_live_root() {
79 # Watches the udev event queue, and exits if all current events are handled
80 udevadm settle --timeout=3 --quiet
81 killall "${_UDEV_DAEMON##*/}" 2>/dev/null
82
83 # Move the mount points of some filesystems over to
84 # the corresponding directories under the real root filesystem.
85 for dir in `awk '/\/dev.* \/media/{print $2}' /proc/mounts`; do
86 mkdir -p ${ROOT_MOUNT}/$dir
87 mount -n --move $dir ${ROOT_MOUNT}/$dir
88 done
89 mount -n --move /proc ${ROOT_MOUNT}/proc
90 mount -n --move /sys ${ROOT_MOUNT}/sys
91 mount -n --move /dev ${ROOT_MOUNT}/dev
92
93 cd $ROOT_MOUNT
94
95 # busybox switch_root supports -c option
96 exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init $CMDLINE ||
97 fatal "Couldn't switch_root, dropping to shell"
98}
99
100fatal() {
101 echo $1 >$CONSOLE
102 echo >$CONSOLE
103 exec sh
104}
105
106early_setup
107
108[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
109
110read_args
111
112echo "Waiting for removable media..."
113C=0
114while true
115do
116 for i in `ls /media 2>/dev/null`; do
117 if [ -f /media/$i/$ROOT_IMAGE ] ; then
118 found="yes"
119 break
120 elif [ -f /media/$i/isolinux/$ROOT_IMAGE ]; then
121 found="yes"
122 ISOLINUX="isolinux"
123 break
124 fi
125 done
126 if [ "$found" = "yes" ]; then
127 break;
128 fi
129 # don't wait for more than $shelltimeout seconds, if it's set
130 if [ -n "$shelltimeout" ]; then
131 echo -n " " $(( $shelltimeout - $C ))
132 if [ $C -ge $shelltimeout ]; then
133 echo "..."
134 echo "Mounted filesystems"
135 mount | grep media
136 echo "Available block devices"
137 ls /dev/sd*
138 fatal "Cannot find $ROOT_IMAGE file in /media/* , dropping to a shell "
139 fi
140 C=$(( C + 1 ))
141 fi
142 sleep 1
143done
144
145# Try to mount the root image read-write and then boot it up.
146# This function distinguishes between a read-only image and a read-write image.
147# In the former case (typically an iso), it tries to make a union mount if possible.
148# In the latter case, the root image could be mounted and then directly booted up.
149mount_and_boot() {
150 mkdir $ROOT_MOUNT
151 mknod /dev/loop0 b 7 0 2>/dev/null
152
153 if ! mount -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
154 fatal "Could not mount rootfs image"
155 fi
156
157 if touch $ROOT_MOUNT/bin 2>/dev/null; then
158 # The root image is read-write, directly boot it up.
159 boot_live_root
160 fi
161
162 # determine which unification filesystem to use
163 union_fs_type=""
164 if grep -q -w "overlayfs" /proc/filesystems; then
165 union_fs_type="overlayfs"
166 elif grep -q -w "aufs" /proc/filesystems; then
167 union_fs_type="aufs"
168 else
169 union_fs_type=""
170 fi
171
172 # make a union mount if possible
173 case $union_fs_type in
174 "overlayfs")
175 mkdir -p /rootfs.ro /rootfs.rw
176 if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
177 rm -rf /rootfs.ro /rootfs.rw
178 fatal "Could not move rootfs mount point"
179 else
180 mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
181 mount -t overlayfs -o "lowerdir=/rootfs.ro,upperdir=/rootfs.rw" overlayfs $ROOT_MOUNT
182 mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
183 mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
184 mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
185 fi
186 ;;
187 "aufs")
188 mkdir -p /rootfs.ro /rootfs.rw
189 if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
190 rm -rf /rootfs.ro /rootfs.rw
191 fatal "Could not move rootfs mount point"
192 else
193 mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
194 mount -t aufs -o "dirs=/rootfs.rw=rw:/rootfs.ro=ro" aufs $ROOT_MOUNT
195 mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
196 mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
197 mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
198 fi
199 ;;
200 "")
201 mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media
202 ;;
203 esac
204
205 # boot the image
206 boot_live_root
207}
208
209case $label in
210 boot)
211 mount_and_boot
212 ;;
213 install|install-efi)
214 if [ -f /media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
215 ./$label.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode $console_params
216 else
217 fatal "Could not find $label script"
218 fi
219
220 # If we're getting here, we failed...
221 fatal "Installation image failed"
222 ;;
223esac