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# args: source, mountpoint
_mnt_bind()
{
msg "::: Binding ${1} to ${2}"
mkdir -p /real_root${2}
/bin/mount -o bind ${1} /real_root${2}
}
# args: image file
_mnt_squashfs()
{
msg "::: Adding new union branch: ${1}"
/bin/modprobe -q loop >/dev/null 2>&1
mkdir -p "/tmpfs/mnt/loop${LOOP_NUM}"
# sometimes it takes udev a while to create device nodes
until [ -e "/dev/loop${LOOP_NUM}" ]; do
sleep 1
done
if ! /bin/losetup "/dev/loop${LOOP_NUM}" ${1}; then
echo "ERROR: Cannot mount loop device /dev/loop${LOOP_NUM}"
break
fi
/bin/mount -r -t squashfs "/dev/loop${LOOP_NUM}" "/tmpfs/mnt/loop${LOOP_NUM}"
/bin/mount -t unionfs -o remount,add=:/tmpfs/mnt/loop${LOOP_NUM}=ro none "/real_root"
export LOOP_NUM=$(( $LOOP_NUM + 1 ))
}
run_hook ()
{
if [ "x${arch}" = "x" ]; then
arch="$(uname -m)"
fi
if [ "x${ramdisk_size}" = "x" ]; then
ramdisk_size="75%"
fi
msg -n ":: Mounting tmpfs, size=${ramdisk_size}..."
mount -t tmpfs -o "size=${ramdisk_size}" tmpfs /tmpfs
msg "done."
# external drives may need to settle
msg ":: Waiting for usb devices to settle..."
/sbin/udevadm trigger --subsystem-match=usb
/sbin/udevadm settle
msg ":: Scanning for boot device..."
/bin/mkdir -p /bootmnt
bootmnt="/bootmnt"
found=0
/bin/modprobe -q isofs >/dev/null 2>&1
msg ":: Scanning cd drives..."
for cdrom in /dev/hd[a-z] /dev/sr[0-9]* /dev/scd[a-z] /dev/sg[0-9]*; do
if mount -r -t iso9660 "${cdrom}" ${bootmnt} >/dev/null 2>&1; then
if [ -e "${bootmnt}/isomounts" ]; then
found=1
msg "${cdrom}"
break
fi
else
echo "Failed to mount ${cdrom}"
fi
[ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
done
if [ ${found} -eq 0 ]; then
msg ":: Scanning usb drives..."
for usb in /dev/sd[a-z][0-9]; do
if mount -r -t vfat "${usb}" ${bootmnt} >/dev/null 2>&1 ||\
mount -r -t ext2 "${usb}" ${bootmnt} >/dev/null 2>&1; then
if [ -e "${bootmnt}/isomounts" ]; then
found=1
msg "${usb}"
break
fi
else
echo "Failed to mount ${usb}"
fi
[ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
done
fi
if [ ${found} -eq 0 ]; then
echo "ERROR: cannot find boot device, cannot continue..."
echo " Falling back to interactive prompt"
PS1="ramfs$ " /bin/sh -i
exit 1
fi
base_img="${bootmnt}/root-image.sqfs"
if [ "${copytoram}" = "y" ]; then
msg ":: Copying squashfs image to RAM"
/bin/cat ${base_img} > /tmpfs/root-image.sqfs
base_img="/tmpfs/root-image.sqfs"
fi
/bin/modprobe -q squashfs >/dev/null 2>&1
msg ":: Mounting root (union) filesystem"
/bin/modprobe -q unionfs >/dev/null 2>&1
/bin/mount -t unionfs -o dirs=/tmpfs=rw none /real_root
export LOOP_NUM="0"
if [ -e "/isomounts" ]; then
msg ":: Mounting images"
while read img imgarch mountpoint type; do
# check if this line is a comment (starts with #)
[ "${img#"#"}" != "${img}" ] && continue
[ "$imgarch" != "$arch" ] && continue
if [ "${type}" = "bind" ]; then
_mnt_bind ${img} ${mountpoint}
elif [ "${type}" = "squashfs" ]; then
_mnt_squashfs "${img}"
fi
done < /isomounts
else
msg ":: No mountable images found"
fi
# layer the "pristine" base system image last
_mnt_squashfs ${base_img}
if [ -d /proc/sys/dev/cdrom ]; then
echo 0 > /proc/sys/dev/cdrom/lock
echo 0 > /proc/sys/dev/cdrom/autoeject
fi
if [ "${break}" = "y" ]; then
echo ":: Break requested, type 'exit' to resume operation"
echo " NOTE: klibc contains no 'ls' binary, use 'echo *' instead"
PS1="ramfs$ " /bin/sh -i
fi
udevpid=$(/bin/minips -C udevd -o pid=)
[ "x${udevpid}" != "x" ] && /bin/kill -9 $udevpid 2>&1 >/dev/null
#Yep, we're bailing out here. We don't need kinit.
msg ":: Passing control to Archlinux Initscripts...Please Wait"
/bin/umount /sys
/bin/umount /proc
exec /bin/run-init -c /dev/console /real_root /sbin/init ${CMDLINE}
}
# vim:ft=sh:ts=4:sw=4:et:
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