237 lines
6.5 KiB
Bash
237 lines
6.5 KiB
Bash
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#!/bin/sh
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
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ROOT_MOUNT="/rootfs"
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ROOT_IMAGE="rootfs.img"
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MOUNT="/bin/mount"
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UMOUNT="/bin/umount"
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ISOLINUX=""
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ROOT_DISK=""
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# Copied from initramfs-framework. The core of this script probably should be
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# turned into initramfs-framework modules to reduce duplication.
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udev_daemon() {
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OPTIONS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd"
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for o in $OPTIONS; do
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if [ -x "$o" ]; then
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echo $o
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return 0
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fi
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done
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return 1
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}
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_UDEV_DAEMON=`udev_daemon`
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early_setup() {
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mkdir -p /proc
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mkdir -p /sys
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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mount -t devtmpfs none /dev
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# support modular kernel
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modprobe isofs 2> /dev/null
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mkdir -p /run
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mkdir -p /var/run
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$_UDEV_DAEMON --daemon
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udevadm trigger --action=add
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}
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read_args() {
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[ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
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for arg in $CMDLINE; do
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optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
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case $arg in
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root=*)
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ROOT_DEVICE=$optarg ;;
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rootimage=*)
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ROOT_IMAGE=$optarg ;;
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rootfstype=*)
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modprobe $optarg 2> /dev/null ;;
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LABEL=*)
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label=$optarg ;;
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video=*)
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video_mode=$arg ;;
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vga=*)
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vga_mode=$arg ;;
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console=*)
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if [ -z "${console_params}" ]; then
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console_params=$arg
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else
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console_params="$console_params $arg"
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fi ;;
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debugshell*)
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if [ -z "$optarg" ]; then
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shelltimeout=30
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else
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shelltimeout=$optarg
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fi
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esac
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done
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}
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boot_live_root() {
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# Watches the udev event queue, and exits if all current events are handled
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udevadm settle --timeout=3 --quiet
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# Kills the current udev running processes, which survived after
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# device node creation events were handled, to avoid unexpected behavior
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killall -9 "${_UDEV_DAEMON##*/}" 2>/dev/null
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# Don't run systemd-update-done on systemd-based live systems
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# because it triggers a slow rebuild of ldconfig caches.
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touch ${ROOT_MOUNT}/etc/.updated ${ROOT_MOUNT}/var/.updated
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# Allow for identification of the real root even after boot
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mkdir -p ${ROOT_MOUNT}/media/realroot
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mount -n --move "/run/media/${ROOT_DISK}" ${ROOT_MOUNT}/media/realroot
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# Move the mount points of some filesystems over to
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# the corresponding directories under the real root filesystem.
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for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
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mkdir -p ${ROOT_MOUNT}/media/${dir##*/}
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mount -n --move $dir ${ROOT_MOUNT}/media/${dir##*/}
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done
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mount -n --move /proc ${ROOT_MOUNT}/proc
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mount -n --move /sys ${ROOT_MOUNT}/sys
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mount -n --move /dev ${ROOT_MOUNT}/dev
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cd $ROOT_MOUNT
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# busybox switch_root supports -c option
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exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init $CMDLINE ||
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fatal "Couldn't switch_root, dropping to shell"
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}
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fatal() {
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echo $1 >$CONSOLE
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echo >$CONSOLE
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exec sh
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}
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early_setup
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[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
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read_args
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echo "Waiting for removable media..."
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C=0
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while true
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do
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for i in `ls /run/media 2>/dev/null`; do
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if [ -f /run/media/$i/$ROOT_IMAGE ] ; then
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found="yes"
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ROOT_DISK="$i"
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break
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elif [ -f /run/media/$i/isolinux/$ROOT_IMAGE ]; then
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found="yes"
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ISOLINUX="isolinux"
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ROOT_DISK="$i"
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break
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fi
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done
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if [ "$found" = "yes" ]; then
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break;
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fi
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# don't wait for more than $shelltimeout seconds, if it's set
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if [ -n "$shelltimeout" ]; then
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echo -n " " $(( $shelltimeout - $C ))
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if [ $C -ge $shelltimeout ]; then
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echo "..."
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echo "Mounted filesystems"
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mount | grep media
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echo "Available block devices"
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cat /proc/partitions
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fatal "Cannot find $ROOT_IMAGE file in /run/media/* , dropping to a shell "
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fi
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C=$(( C + 1 ))
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fi
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sleep 1
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done
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# Try to mount the root image read-write and then boot it up.
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# This function distinguishes between a read-only image and a read-write image.
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# In the former case (typically an iso), it tries to make a union mount if possible.
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# In the latter case, the root image could be mounted and then directly booted up.
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mount_and_boot() {
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mkdir $ROOT_MOUNT
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mknod /dev/loop0 b 7 0 2>/dev/null
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if ! mount -o rw,loop,noatime,nodiratime /run/media/$ROOT_DISK/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
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fatal "Could not mount rootfs image"
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fi
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if touch $ROOT_MOUNT/bin 2>/dev/null; then
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# The root image is read-write, directly boot it up.
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boot_live_root
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fi
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# determine which unification filesystem to use
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union_fs_type=""
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if grep -q -w "overlay" /proc/filesystems; then
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union_fs_type="overlay"
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elif grep -q -w "aufs" /proc/filesystems; then
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union_fs_type="aufs"
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else
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union_fs_type=""
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fi
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# make a union mount if possible
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case $union_fs_type in
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"overlay")
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mkdir -p /rootfs.ro /rootfs.rw
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if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
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rm -rf /rootfs.ro /rootfs.rw
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fatal "Could not move rootfs mount point"
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else
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mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
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mkdir -p /rootfs.rw/upperdir /rootfs.rw/work
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mount -t overlay overlay -o "lowerdir=/rootfs.ro,upperdir=/rootfs.rw/upperdir,workdir=/rootfs.rw/work" $ROOT_MOUNT
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mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
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mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
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mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
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fi
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;;
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"aufs")
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mkdir -p /rootfs.ro /rootfs.rw
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if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
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rm -rf /rootfs.ro /rootfs.rw
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fatal "Could not move rootfs mount point"
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else
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mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
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mount -t aufs -o "dirs=/rootfs.rw=rw:/rootfs.ro=ro" aufs $ROOT_MOUNT
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mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
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mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
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mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
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fi
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;;
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"")
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mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media
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;;
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esac
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# boot the image
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boot_live_root
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}
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if [ "$label" != "boot" -a -f $label.sh ] ; then
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if [ -f /run/media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
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./$label.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode $console_params
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else
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fatal "Could not find $label script"
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fi
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# If we're getting here, we failed...
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fatal "Target $label failed"
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fi
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mount_and_boot
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