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59d01432b1
- 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>
102 lines
1.8 KiB
Bash
102 lines
1.8 KiB
Bash
#!/bin/sh
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PATH=/bin
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/bin/busybox --install
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busybox sleep 1
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busybox mount -t proc proc /proc
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busybox mount -t sysfs sysfs /sys
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busybox mount -t devtmpfs none /dev
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root_sfs=""
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root=""
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root_type=""
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overlay_dev=""
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overlay_type=""
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singleuser=0
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for param in `cat /proc/cmdline`; do
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case $param in
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root=*)
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root="${param##root=}"
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;;
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root_type=*)
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root_type="${param##root_type=}"
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;;
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root_sfs=*)
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root_sfs="${param##root_sfs=}"
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;;
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overlay_dev=*)
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overlay_dev="${param##overlay_dev=}"
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;;
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overlay_type=*)
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overlay_type="${param##overlay_type=}"
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;;
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single*)
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singleuser=1
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;;
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esac
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done
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if [ -z "${root}" ]; then
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echo "No root drive specified!"
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exec /bin/busybox sh
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fi
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# file system setup
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mount_device() {
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local device="$1"
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local mountpoint="$2"
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local type="$3"
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case $type in
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qemu)
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mount -t 9p -o trans=virtio -oversion=9p2000.L $device $mountpoint
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;;
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*)
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while [ ! -e $device ]; do
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echo "Waiting for device $device"
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busybox sleep 1
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done
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mount $device $mountpoint
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;;
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esac
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}
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if [ ! -z "$root_sfs" ]; then
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mount_device "$root" "/images" "$root_type"
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if [ ! -e /images/${root_sfs} ]; then
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echo "${root_sfs} not found!"
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exec /bin/busybox sh
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exit 1
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fi
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mount -t squashfs /images/${root_sfs} /newroot
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umount -l /images
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else
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mount_device "$root" "/newroot" "$root_type"
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fi
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if [ ! -z "$overlay_dev" ]; then
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mount_device "$overlay_dev" "/newroot/cfg/overlay" "$overlay_type"
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chroot /newroot mount -n -t overlay overlay -olowerdir=/cfg/preserve/etc,upperdir=/cfg/overlay/etc,workdir=/cfg/overlay/etc_work /etc
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fi
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# cleanup mounts
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umount -l /dev
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umount /sys
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umount /proc
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# switch_root
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unset -v overlay_dev root root_sfs overlay_type root_type
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if [ "$singleuser" == "1" ]; then
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unset -v singleuser
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exec /bin/busybox switch_root /newroot /bin/bash
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fi
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unset -v singleuser
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exec /bin/busybox switch_root /newroot /bin/init
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