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https://git.yoctoproject.org/poky
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b23b2b42a0
[YOCTO #1487] When booting up with liveCD image, init scripts can't work well on read-only filesystem. Unionfs, which is supported in Yocto kernel, allows a filesystem to appear as writeable, but without actually allowing writes to change the filesystem. Use unionfs to mount rootfs and make root file system can be writen when using liveCD to boot up. Set UNION_FS variable depending on kernel config, so that it can work with kernel which doesn't have unionfs feature. [RP: Mark recipe as machine specific due to kernel dependency] (From OE-Core rev: b7f4e8d153c2aebbcf6556e7e926f6b94801d6aa) Signed-off-by: Yang Shi <yang.shi@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
124 lines
2.5 KiB
Bash
124 lines
2.5 KiB
Bash
#!/bin/sh
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
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ROOT_MOUNT="/rootfs/"
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ROOT_IMAGE="rootfs.img"
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MOUNT="/bin/mount"
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UMOUNT="/bin/umount"
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ISOLINUX=""
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UNIONFS="no"
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early_setup() {
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mkdir /proc
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mkdir /sys
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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# support modular kernel
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modprobe isofs 2> /dev/null
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mkdir /run
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udevd --daemon
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udevadm trigger --action=add
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}
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read_args() {
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[ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
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for arg in $CMDLINE; do
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optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
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case $arg in
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root=*)
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ROOT_DEVICE=$optarg ;;
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rootfstype=*)
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modprobe $optarg 2> /dev/null ;;
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LABEL=*)
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label=$optarg ;;
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video=*)
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video_mode=$arg ;;
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vga=*)
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vga_mode=$arg ;;
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esac
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done
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}
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boot_live_root() {
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killall udevd 2>/dev/null
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# use devtmpfs if available
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if grep -q devtmpfs /proc/filesystems; then
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mount -t devtmpfs devtmpfs $ROOT_MOUNT/dev
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fi
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cd $ROOT_MOUNT
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exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init
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}
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fatal() {
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echo $1 >$CONSOLE
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echo >$CONSOLE
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exec sh
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}
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early_setup
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[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
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read_args
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echo "Waiting for removable media..."
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while true
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do
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for i in `ls /media 2>/dev/null`; do
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if [ -f /media/$i/$ROOT_IMAGE ] ; then
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found="yes"
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break
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elif [ -f /media/$i/isolinux/$ROOT_IMAGE ]; then
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found="yes"
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ISOLINUX="isolinux"
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break
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fi
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done
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if [ "$found" = "yes" ]; then
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break;
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fi
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sleep 1
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done
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case $label in
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boot)
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mkdir $ROOT_MOUNT
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mknod /dev/loop0 b 7 0 2>/dev/null
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if [ "$UNIONFS" = "yes" ]; then
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mkdir /rootfs-tmp
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if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs-tmp ; then
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fatal "Could not mount rootfs image"
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else
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mkdir /cow
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mount -t tmpfs -o rw,noatime,mode=755 tmpfs /cow
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mount -t unionfs -o dirs=/cow:/rootfs-tmp=ro unionfs $ROOT_MOUNT
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boot_live_root
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fi
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else
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if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
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fatal "Could not mount rootfs image"
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else
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boot_live_root
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fi
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fi
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;;
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install)
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if [ -f /media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
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./install.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode
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else
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fatal "Could not find install script"
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fi
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# If we're getting here, we failed...
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fatal "Installation image failed"
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;;
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esac
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