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077f72f529
- Dedicate home directory for root user (classic /root) - Root homedirectory is overlay mounted - Allows us to have an empty user directory that we directly mount, i.e. without using overlay fs Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
114 lines
2.3 KiB
Bash
114 lines
2.3 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 ${root} ]; do
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echo "Waiting for root"
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busybox sleep 1
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done
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# file system setup
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overlay_mount() {
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local lower=/newroot/${1}
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local upper=/newroot/${2}
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local work=/newroot/${2}_work
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local target=/newroot/${3}
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mount -t overlay overlay -olowerdir=${lower},upperdir=${upper},workdir=${work} ${target}
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}
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bind_mount() {
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mount --bind /newroot/${1} /newroot/${2}
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}
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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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mount -t devtmpfs none /newroot/dev
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mount -t proc proc /newroot/proc
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mount -t sysfs sysfs /newroot/sys
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mount -t tmpfs none /newroot/tmp
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mount -t tmpfs none /newroot/var
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mount -t tmpfs none /newroot/run
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chmod 755 /newroot/var
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mkdir -p /newroot/run/log/journal
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mkdir -p /newroot/var/log/fsck
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mkdir -p /newroot/var/log/nginx
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mkdir -p /newroot/var/log/mpd
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mkdir -p /newroot/var/spool/
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mkdir -p /newroot/var/lib/
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mkdir -p /newroot/var/tmp
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ln -s /run /newroot/var/run
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ln -s /run/lock /newroot/var/lock
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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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overlay_mount "cfg/preserve/etc" "cfg/overlay/etc" "etc"
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overlay_mount "cfg/preserve/var_lib" "cfg/overlay/var_lib" "var/lib"
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overlay_mount "cfg/preserve/root" "cfg/overlay/root" "root"
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else
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bind_mount "cfg/preserve/etc" "etc"
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bind_mount "cfg/preserve/var_lib" "var/lib"
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bind_mount "cfg/preserve/root" "root"
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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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unset -v singleuser overlay_dev root root_sfs
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exec /bin/busybox switch_root /newroot /bin/bash --login
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