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97 lines
2.6 KiB
97 lines
2.6 KiB
#!/bin/sh
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#
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# This boot-script boots a system found in a given LVM
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# logical volume.
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# In case of trouble it passes control to the original init
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# thus giving gettys and running /etc/boot.d/*
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# It is included in system.tar.bz2. For usage information
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# see below.
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#
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# Plan:
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# -read kernel append line by /proc/1/environ and evaluate
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# ROOTLV (should point to /dev/vg00/lvroot00 or kind of)
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# -mount ROOTLV to /mnt/root (ro)
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# -pivot_root to /mnt/root
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# -chroot into /mnt/root and exec init
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#
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# mini-howto of usage:
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#
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# -build your rescue target (you get system.tar.bz2 and initrd.img)
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# -put system.tar.bz2 in /rescue onto your boot-device-fs
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# -optional: put overlay.tar.bz2 in /rescue onto your boot-device-fs
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# -get a kernel and arm your favorite boot-loader
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# -pass stage2init=/sbin/init-lvm-cycle to the kernel
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# -pass ROOTLV=/dev/vgXX/lvYYY to the kernel
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# -don't forget to pass initrd.img to your boot loader
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# -and boot
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#
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# you can omit ROOTLV parameter to get the rescue system
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#
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# see contrib/menu.lst-example
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#
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# Tobias Hintze <th@rocklinux.org> (c) 2004
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#
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shopt -s execfail
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fail() {
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echo "$1"
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echo
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echo "continuing inside rescue-stage2..."
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exec /sbin/init
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echo "failed to execute /sbin/init."
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echo "all that i can give to you is that shell."
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echo
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exec sh
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}
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fail_shell() {
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echo "$1"
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echo
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echo "try to fix the problem and terminate this shell."
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echo
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sh
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}
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# some init
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export PATH=/sbin:/bin:/usr/sbin:/usr/bin
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mount -t proc proc /proc
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mkdir /mnt/boot /mnt/root
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mount --move /old_root/mnt_boot /mnt/boot
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umount -n /old_root
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# read ROOTLV and additional arguments (e.g. runlevel)
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ROOTLV=`cat /proc/1/environ | tr '\0' '\n' | grep -i ^rootlv | cut -d= -f2`
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[ -z "$ROOTLV" ] && fail "no ROOTLV specified."
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INITARGS=""
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RUNLEVEL=`cat /proc/1/environ | tr '\0' '\n' | grep -i ^runlevel | cut -d= -f2`
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if [ ! -z "$RUNLEVEL" ] ; then
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echo "runlevel specified. passing $RUNLEVEL to init."
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INITARGS="$RUNLEVEL"
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fi
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# scan for and activate volume groups
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[ -f /etc/conf/lvm2wrap ] && . /etc/conf/lvm2wrap
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vgscan && vgchange -ay
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[ -e "$ROOTLV" ] || fail "specified ROOTLV does not exist."
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# mount new root
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mount -o ro $ROOTLV /mnt/root
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cd /mnt/root
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# move mounts inside new root
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[ -d dev ] || fail_shell "dev/ mountpoint does not exist."
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mount --move /dev dev
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[ -d mnt/boot ] || fail_shell "mnt/boot/ mountpoint does not exist."
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mount --move /mnt/boot mnt/boot
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[ -d mnt/oldroot ] || fail_shell "mnt/oldroot/ mountpoint does not exist."
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umount /proc
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# switch to new root and exec init
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mknod dev/initctl p
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pivot_root . mnt/oldroot
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exec chroot . sh -c "umount /mnt/oldroot ; exec /sbin/init $INITARGS" \
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<dev/console >dev/console 2>&1
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fail "pivot_root failed..."
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