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|
#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
ROOT_MOUNT="/rootfs/"
ROOT_IMAGE="rootfs.img"
MOUNT="/bin/mount"
UMOUNT="/bin/umount"
ISOLINUX=""
UNIONFS="no"
early_setup() {
mkdir -p /proc
mkdir -p /sys
mount -t proc proc /proc
mount -t sysfs sysfs /sys
# support modular kernel
modprobe isofs 2> /dev/null
mkdir -p /run
udevd --daemon
udevadm trigger --action=add
}
read_args() {
[ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
for arg in $CMDLINE; do
optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
case $arg in
root=*)
ROOT_DEVICE=$optarg ;;
rootfstype=*)
modprobe $optarg 2> /dev/null ;;
LABEL=*)
label=$optarg ;;
video=*)
video_mode=$arg ;;
vga=*)
vga_mode=$arg ;;
console=*)
if [ -z "${console_params}" ]; then
console_params=$arg
else
console_params="$console_params $arg"
fi
esac
done
}
boot_live_root() {
killall udevd 2>/dev/null
# use devtmpfs if available
if grep -q devtmpfs /proc/filesystems; then
mount -t devtmpfs devtmpfs $ROOT_MOUNT/dev
fi
cd $ROOT_MOUNT
exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init
}
fatal() {
echo $1 >$CONSOLE
echo >$CONSOLE
exec sh
}
early_setup
[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
read_args
echo "Waiting for removable media..."
while true
do
for i in `ls /media 2>/dev/null`; do
if [ -f /media/$i/$ROOT_IMAGE ] ; then
found="yes"
break
elif [ -f /media/$i/isolinux/$ROOT_IMAGE ]; then
found="yes"
ISOLINUX="isolinux"
break
fi
done
if [ "$found" = "yes" ]; then
break;
fi
sleep 1
done
case $label in
boot)
mkdir $ROOT_MOUNT
mknod /dev/loop0 b 7 0 2>/dev/null
if [ "$UNIONFS" = "yes" ]; then
mkdir /rootfs-tmp
if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs-tmp ; then
fatal "Could not mount rootfs image"
else
mkdir /cow
mount -t tmpfs -o rw,noatime,mode=755 tmpfs /cow
mount -t unionfs -o dirs=/cow:/rootfs-tmp=ro unionfs $ROOT_MOUNT
boot_live_root
fi
else
if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
fatal "Could not mount rootfs image"
else
boot_live_root
fi
fi
;;
install|install-efi)
if [ -f /media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
./$label.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode $console_params
else
fatal "Could not find $label script"
fi
# If we're getting here, we failed...
fatal "Installation image failed"
;;
esac
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