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https://github.com/pygos/build.git
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84 lines
1.5 KiB
Bash
84 lines
1.5 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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overlay_dev=""
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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_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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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 "${root}" ]; then
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echo "No root drive specified!"
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exec /bin/busybox sh
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fi
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if [ -z "${root_sfs}" ]; then
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echo "No squashfs image specified!"
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exec /bin/busybox sh
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fi
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while [ ! -e ${root} ]; do
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echo "Waiting for root"
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busybox sleep 1
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done
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# file system setup
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mount ${root} /images
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if [ ! -e /images/${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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if [ ! -z "$overlay_dev" ]; then
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while [ ! -e ${overlay_dev} ]; do
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echo "Waiting for overlay device"
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busybox sleep 1
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done
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mount ${overlay_dev} /newroot/cfg/overlay
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chroot /newroot mount -n -t overlay overlay -olowerdir=/cfg/preserve/etc,upperdir=/cfg/overlay/etc,workdir=/cfg/overlay/etc_work /etc
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else
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chroot /newroot mount -n --bind /cfg/preserve/etc /etc
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fi
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# cleanup mounts
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umount -l /images
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umount -l /dev
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umount /sys
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umount /proc
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if [ "$singleuser" == "1" ]; then
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unset -v singleuser overlay_dev root root_sfs
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exec /bin/busybox switch_root /newroot /bin/bash
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fi
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unset -v singleuser overlay_dev root root_sfs
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exec /bin/busybox switch_root /newroot /bin/init
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