279 lines
8.6 KiB
Bash
279 lines
8.6 KiB
Bash
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#!/bin/bash
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# Shell script to prepare a root FS image based on the Novell/SUSE rescue
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# image source. You must have a xen kernel installed for this to work.
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# (c) Kurt Garloff <garloff@suse.de>, 2005-01-24, GNU GPL
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# Maintained by Charles Coffing <ccoffing@novell.com>
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#
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# TODO:
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# - trap SIGINT and clean up
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# - can't know that /sbin/depmod will work with this rescue image
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# - support domUloader
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# - check for disk full in exchange_kernel_modules
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MB_DEFAULT=88
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usage()
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{
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echo "Usage:"
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echo " mk-xen-rescue-img.sh source destination [MB [kernelver]]"
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echo "Purpose:"
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echo " Creates a root filesystem and an associated config file for a Xen-compatible"
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echo " Linux virtual machine."
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echo "Arguments:"
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echo " * 'source' is the source from which to copy files. Normally, this is"
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echo " the SUSE rescue image, such as /media/cdrom/boot/x86_64/rescue,"
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echo " but it could also be an already-mounted root filesystem."
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echo " * 'destination' is the pathname of a disk image to be created, based on"
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echo " 'source'."
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echo " * 'MB' is the size of disk image (default $MB_DEFAULT)."
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echo " * 'kernelver' is the version of an installed Xen-compatible Linux kernel"
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echo " (from the kernel-xen package) to install in the disk image. If not"
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echo " specified, the newest of those currently installed will be selected."
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exit 2
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}
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usage_error()
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{
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echo "Error: $@"
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echo ""
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usage
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}
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error()
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{
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echo "Error: $@"
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if [ ! -z "$DST_MNT" ]; then
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umount "$DST_MNT"
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rmdir "$DST_MNT"
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fi
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exit 1
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}
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cp_error()
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{
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error "Failed to copy files to '$DST'."
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}
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# Determine Xen kernel version
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get_xen_kernel()
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{
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if [ -z "$KVER" ]; then
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KVER="`cd /lib/modules && ls -td *-xen/kernel | head -n1 | sed 's@/kernel@@'`"
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else
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if [ ! -d /lib/modules/$KVER/kernel ]; then
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error "/lib/modules/$KVER/kernel does not exist."
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fi
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fi
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if [ -z "$KVER" ]; then
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error "You need to have a 'kernel-xen' package installed."
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fi
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}
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cp_rescue()
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{
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local LSRC=$1
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local LDST=$2
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# The rescue image has empty directories all hard-linked to the same
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# thing, probably to conserve inodes. This gives 'cp' heartburn.
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# I want hard linked directories to be created separately (i.e.,
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# dereferenced), but I don't want to dereference soft links.
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# 'tar' handles this nicely.
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(cd "$LSRC" && tar --atime-preserve --one-file-system -cf - *) | \
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(cd "$LDST" && tar -xmf -)
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}
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# Create FS and copy rescue FS
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create_basis_and_mount()
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{
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echo "Creating disk image within '$DST'..."
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dd if=/dev/zero of="$DST" bs=4096 count=1 2>/dev/null >/dev/null 2>&1
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dd if=/dev/zero of="$DST" bs=1048576 count=0 seek=$MB >/dev/null 2>&1
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/sbin/mke2fs -b 1024 -i 2048 -L xen_rescue -F "$DST" >/dev/null 2>&1
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DST_MNT="$DST".mnt
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mkdir -p "$DST_MNT"
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mount -o loop "$DST" "$DST_MNT"
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if [ $? -ne 0 ]; then
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error "Failed to mount destination disk image via loopback."
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fi
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echo "Copying files from '$SRC'..."
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if test -d "$SRC"; then
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if [ ! -d "$SRC"/dev ] || [ ! -d "$SRC"/sbin ]; then
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error "'$SRC' does not look like a valid root filesystem."
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fi
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cp_rescue "$SRC" "$DST_MNT"
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if [ $? -ne 0 ]; then
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cp_error
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fi
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else
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mkdir -p "$DST".src
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if test ! -z "`file $SRC | grep gzip`"; then
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cp -p "$SRC" "$DST".stage.gz
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gunzip -f "$DST".stage.gz || rm -f "$DST".stage.gz
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mount -o loop "$DST".stage "$DST".src
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if [ $? -ne 0 ]; then
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rm "$DST".stage
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rmdir "$DST".src
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error "Failed to mount the source via loopback."
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fi
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cp_rescue "$DST".src "$DST_MNT"
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if [ $? -ne 0 ]; then
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umount "$DST".src
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rm "$DST".stage
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rmdir "$DST".src
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cp_error
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fi
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umount "$DST".src
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rm "$DST".stage
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else
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mount -o loop "$SRC" "$DST".src
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if [ $? -ne 0 ]; then
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rmdir "$DST".src
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error "Failed to mount the source via loopback."
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fi
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cp_rescue "$DST".src "$DST_MNT"
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if [ $? -ne 0 ]; then
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umount "$DST".src
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rmdir "$DST".src
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cp_error
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fi
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umount "$DST".src
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fi
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rmdir "$DST".src
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fi
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}
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# Save some inodes
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remove_some_files()
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{
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# these consume an excessive amount of inodes
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rm -f "$DST_MNT"/dev/sd[c-z][a-z][0-9]*
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# hwclock does not work
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rm -f "$DST_MNT"/etc/init.d/boot.d/*boot.clock
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}
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xenify_image()
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{
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# Xen doesn't yet support virtualizing USB
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sed -i "s/^usbfs/#usbfs/" "$DST_MNT"/etc/fstab
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}
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# Copy extra files to rescue image
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copy_extra_files()
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{
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test ! -e "$DST_MNT"/sbin/depmod && cp -p /sbin/depmod "$DST_MNT"/sbin/
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cp -p /usr/share/doc/packages/xen/boot.local.xenU "$DST_MNT"/etc/init.d/boot.local
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}
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# Remove kernel modules and replace by ours
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exchange_kernel_modules()
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{
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echo "Updating kernel within '$DST'..."
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KMODDIR=/lib/modules/$KVER/kernel
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MNTKVER="`cd "$DST_MNT"/lib/modules && ls -td */kernel 2>/dev/null | sed 's@/kernel@@' 2>/dev/null`"
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for dir in $MNTKVER; do
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if test "$MNTKVER" != "$KVER"; then
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rm -rf "$DST_MNT"/lib/modules/$MNTKVER
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fi
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done
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mkdir -p "$DST_MNT"$KMODDIR
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# complete trees
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for dir in arch crypto lib net security; do
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cp -ax $KMODDIR/$dir "$DST_MNT"$KMODDIR/
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done
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mkdir -p "$DST_MNT"$KMODDIR/fs
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cp -p $KMODDIR/fs/*.ko "$DST_MNT"$KMODDIR/fs/
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# a selection of FS
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for fs in afs autofs autofs4 cifs exportfs ext3 fat jbd jfs msdos ncpfs nfsd nls ntfs reiser4 reiserfs smbfs subfs sysv udf ufs vfat xfs; do
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if test -e $KMODDIR/fs/$fs; then
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cp -ax $KMODDIR/fs/$fs "$DST_MNT"$KMODDIR/fs/
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fi
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done
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# some drivers
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mkdir -p "$DST_MNT"$KMODDIR/drivers/char
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for name in lp.ko n_hdlc.ko raw.ko; do
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cp -p $KMODDIR/drivers/char/$name "$DST_MNT"$KMODDIR/drivers/char/
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done
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mkdir -p "$DST_MNT"$KMODDIR/drivers/block
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for name in umem.ko nbd.ko loop.ko loop_fish2.ko cryptoloop.ko; do
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cp -p $KMODDIR/drivers/block/$name "$DST_MNT"$KMODDIR/drivers/block/
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done
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mkdir -p "$DST_MNT"$KMODDIR/drivers/base
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cp -p $KMODDIR/drivers/base/firmware_class.ko "$DST_MNT"$KMODDIR/drivers/base/
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mkdir -p "$DST_MNT"$KMODDIR/drivers/md
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cp -p $KMODDIR/drivers/md/*.ko "$DST_MNT"$KMODDIR/drivers/md/
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mkdir -p "$DST_MNT"$KMODDIR/drivers/xen
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for dir in $KMODDIR/drivers/xen/*front; do
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cp -ax $dir "$DST_MNT"$KMODDIR/drivers/xen/
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done
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if test -e $KMODDIR/kernel; then
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mkdir -p "$DST_MNT"$KMODDIR/kernel
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cp -ax $KMODDIR/kernel/* "$DST_MNT"$KMODDIR/kernel/
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fi
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# Kernel image + System.map
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mkdir -p "$DST_MNT"/boot
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rm -f "$DST_MNT"/boot/vmlinuz-* "$DST_MNT"/boot/System.map-* "$DST_MNT"/boot/initrd-*
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cp -p /boot/vmlinuz-$KVER "$DST_MNT"/boot/
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if test -e /boot/initrd-$KVER-domU; then
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cp -p /boot/initrd-$KVER-domU "$DST_MNT"/boot/initrd-$KVER
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else
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cp -p /boot/initrd-$KVER "$DST_MNT"/boot/
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fi
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cp -p /boot/System.map-$KVER "$DST_MNT"/boot/
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depmod -a $KVER -b "$DST_MNT" -F "$DST_MNT"/boot/System.map-$KVER
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}
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# umount and display message
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umount_and_msg()
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{
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umount "$DST_MNT"
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rmdir "$DST_MNT"
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DST_MNT=
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echo "'$DST' has been prepared successfully."
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CFGFILE=/etc/xen/vm/${DST##*/}
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if test -e $CFGFILE; then
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mv -b $CFGFILE $CFGFILE.save
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fi
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if test "${DST:0:1}" != "/"; then
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DST="`pwd`/$DST"
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fi
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cp -p /etc/xen/examples/xmexample.rescue $CFGFILE
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sed -i "/^disk/s@^.*\$@disk = [ \'file:$DST,hda1,w\' ]@" $CFGFILE
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# These next two lines are only applicable if not using domUloader,
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# but try anyway.
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sed -i "/^kernel/s@^.*\$@kernel = \"/boot/vmlinuz-$KVER\"@" $CFGFILE
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sed -i "/^ramdisk/s@^.*\$@ramdisk = \"/boot/initrd-$KVER\"@" $CFGFILE
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echo ""
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echo "Config file '$CFGFILE' has been created. Please review!"
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echo "You may also want to add an IP address to the config file."
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echo "Start the domain with 'xm create -c $CFGFILE'."
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}
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if test -z "$1" -o -z "$2"; then
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usage
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fi
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SRC=$1
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if [ ! -e "$SRC" ]; then
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usage_error "'$SRC' does not exist."
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fi
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DST=$2
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if [ -e "$DST" ]; then
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error "'$DST' already exists."
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fi
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MB=$MB_DEFAULT
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[ ! -z "$3" ] && MB=$3
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KVER=$4
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if [ `id -u` -ne 0 ]; then
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usage_error "Please run this script as root."
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fi
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get_xen_kernel
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create_basis_and_mount
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remove_some_files
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copy_extra_files
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xenify_image
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exchange_kernel_modules
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umount_and_msg
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