mirror of
https://github.com/pygos/build.git
synced 2024-11-10 21:57:10 +01:00
169 lines
3.8 KiB
Bash
169 lines
3.8 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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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/${2}
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}
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setup_vfs() {
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local root=${1}
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mount -t proc proc $root/proc
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mount -t sysfs sysfs $root/sys
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mount -t devtmpfs none $root/dev
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# setup /dev
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[ -e $root/dev/fd ] || ln -snf /proc/self/fd $root/dev/fd
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[ -e $root/dev/stdin ] || ln -snf /proc/self/fd/0 $root/dev/stdin
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[ -e $root/dev/stdout ] || ln -snf /proc/self/fd/1 $root/dev/stdout
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[ -e $root/dev/stderr ] || ln -snf /proc/self/fd/2 $root/dev/stderr
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[ -e $root/proc/kcore ] && ln -snf /proc/kcore $root/dev/core
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for x in \
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"mqueue dev/mqueue 1777 ,nodev mqueue" \
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"devpts dev/pts 0755 ,gid=5,mode=0620 devpts" \
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"tmpfs dev/shm 1777 ,nodev,mode=1777 shm" \
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; do
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set -- $x
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grep -Eq "[[:space:]]+$1$" /proc/filesystems || continue
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if [ ! -d "$root/$2" ]; then
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mkdir -m $3 -p "$root/$2" >/dev/null 2>&1 || \
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echo "Could not create $root/$2!"
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fi
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if [ -d "$root/$2" ]; then
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mount -t $1 -o noexec,nosuid$4 $5 "$root/$2"
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fi
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done
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# set up additional mounts in /proc and /sys
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for x in \
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"sys/kernel/security securityfs nodev,noexec,nosuid" \
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"sys/kernel/config configfs nodev,noexec,nosuid" \
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"sys/fs/fuse/connections fusectl nodev,noexec,nosuid" \
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"sys/firmware/efi/efivars efivarfs ro" \
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"proc/sys/fs/binfmt_misc binfmt_misc nodev,noexec,nosuid" \
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; do
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set -- $x
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if [ -d "$root/$1" ]; then
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if grep -qs $2 "$root/proc/filesystems"; then
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echo "Mounting $2 filesystem"
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mount -n -t $2 -o $3 $2 "$root/$1"
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fi
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fi
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done
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unset -v x
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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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setup_vfs "/newroot"
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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 ${overlay_dev} /newroot/cfg/overlay
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overlay_mount "cfg/preserve/etc" "cfg/overlay/etc" "etc"
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overlay_mount "cfg/preserve/var_lib" "cfg/overlay/var_lib" "var/lib"
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overlay_mount "cfg/preserve/root" "cfg/overlay/root" "root"
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else
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bind_mount "cfg/preserve/etc" "etc"
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bind_mount "cfg/preserve/var_lib" "var/lib"
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bind_mount "cfg/preserve/root" "root"
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fi
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# cleanup mounts
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umount -l /images
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umount -l /dev
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umount /sys
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umount /proc
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if [ "$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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