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More sophisticated filesystem setup from initrd

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- Let us specify the "type" of the root and overlay filesystem.
   At the moment we have raw device that we wait for (default) and
   qemu virtio 9pfs.
 - If no squasfs image is specified, mount the root partition as
   root filesystem.
 - If no overlay device is specified, don't touch the new root
   filesystem.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
This commit is contained in:
David Oberhollenzer 2018-09-29 18:03:22 +02:00
parent 2d74caf06b
commit 59d01432b1
1 changed files with 46 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

73
pkg/initrd/initrd.skel
View file

@ -10,7 +10,9 @@ busybox mount -t devtmpfs none /dev
root_sfs=""
root=""
root_type=""
overlay_dev=""
overlay_type=""
singleuser=0
for param in `cat /proc/cmdline`; do
@ -18,12 +20,18 @@ for param in `cat /proc/cmdline`; do
root=*)
root="${param##root=}"
;;
root_type=*)
root_type="${param##root_type=}"
;;
root_sfs=*)
root_sfs="${param##root_sfs=}"
;;
overlay_dev=*)
overlay_dev="${param##overlay_dev=}"
;;
overlay_type=*)
overlay_type="${param##overlay_type=}"
;;
single*)
singleuser=1
;;
@ -35,49 +43,60 @@ if [ -z "${root}" ]; then
exec /bin/busybox sh
fi
if [ -z "${root_sfs}" ]; then
echo "No squashfs image specified!"
exec /bin/busybox sh
fi
while [ ! -e ${root} ]; do
echo "Waiting for root"
busybox sleep 1
done
# file system setup
mount ${root} /images
mount_device() {
local device="$1"
local mountpoint="$2"
local type="$3"
if [ ! -e /images/${root_sfs} ]; then
echo "${root_sfs} not found!"
exec /bin/busybox sh
exit 1
case $type in
qemu)
mount -t 9p -o trans=virtio -oversion=9p2000.L $device $mountpoint
;;
*)
while [ ! -e $device ]; do
echo "Waiting for device $device"
busybox sleep 1
done
mount $device $mountpoint
;;
esac
}
if [ ! -z "$root_sfs" ]; then
mount_device "$root" "/images" "$root_type"
if [ ! -e /images/${root_sfs} ]; then
echo "${root_sfs} not found!"
exec /bin/busybox sh
exit 1
fi
mount -t squashfs /images/${root_sfs} /newroot
umount -l /images
else
mount_device "$root" "/newroot" "$root_type"
fi
mount -t squashfs /images/${root_sfs} /newroot
if [ ! -z "$overlay_dev" ]; then
while [ ! -e ${overlay_dev} ]; do
echo "Waiting for overlay device"
busybox sleep 1
done
mount_device "$overlay_dev" "/newroot/cfg/overlay" "$overlay_type"
mount ${overlay_dev} /newroot/cfg/overlay
chroot /newroot mount -n -t overlay overlay -olowerdir=/cfg/preserve/etc,upperdir=/cfg/overlay/etc,workdir=/cfg/overlay/etc_work /etc
else
chroot /newroot mount -n --bind /cfg/preserve/etc /etc
fi
# cleanup mounts
umount -l /images
umount -l /dev
umount /sys
umount /proc
# switch_root
unset -v overlay_dev root root_sfs overlay_type root_type
if [ "$singleuser" == "1" ]; then
unset -v singleuser overlay_dev root root_sfs
unset -v singleuser
exec /bin/busybox switch_root /newroot /bin/bash
fi
unset -v singleuser overlay_dev root root_sfs
unset -v singleuser
exec /bin/busybox switch_root /newroot /bin/init