initial vmdebootstrap.sh version

It needs quite some hacks to get grub working inside a VM image,
but finally it basically works. \o/

Needs improvement WRT grub-mkimage from host vs. VM (core.img
differing and might cause syntax errors in some specific
situations) and the final integratation within grml-debootstrap,
our automated deployment and vm-builder. -> WIP

From: Michael Prokop <mprokop@sipwise.com>

vmdebootstrap.sh

@@ -0,0 +1,99 @@
+#!/bin/bash
+
+set -x
+set -e
+
+grubonly=0 # for testing
+
+if ! [ -r /etc/grml_cd ] ; then
+  echo "Not running inside Grml, exiting to avoid damage." >&2
+  exit 1
+fi
+
+if stat --help >/dev/null 2>&1; then
+  getfilesize='stat -c %s'  # GNU stat
+else
+  getfilesize='stat -f %z'  # BSD stat
+fi
+
+# FIXME - integrate in vmdebootstrap
+wget grml.org/sipwise/bootgrub.mksh
+
+# FIXME - don't depend on it
+if ! [ -d /mnt/sda1/lost+found ] ; then
+  mount /dev/sda1 /mnt/sda1
+fi
+
+# FIXME - integrate in deployment ISO
+apt-get update ; apt-get -y install kpartx qemu-utils grub-pc mksh
+
+IMAGE=/mnt/sda1/qemu.img
+TMPDIR=$(mktemp -d) || exit 1
+
+# problem: 1.99~rc1 results in "error: no such argument" -> core.img from VM?
+grub-mkimage -O i386-pc -p '(hd0,msdos1)/boot/grub' -o "$TMPDIR/core.img" \
+    biosdisk part_msdos ext2
+ifirst=4
+ilast=$(($($getfilesize "$TMPDIR/core.img")/512+ifirst))
+
+qemu-img create -f raw "${IMAGE}" 3G
+echo 4 63 | mksh bootgrub.mksh -A | dd of="$IMAGE" conv=notrunc
+dd if="$TMPDIR/core.img" of="$IMAGE" conv=notrunc seek=$ifirst
+rm -f "$TMPDIR/core.img"
+dd if=/dev/zero bs=1 conv=notrunc count=64 seek=446 of="$IMAGE"
+parted -s "${IMAGE}" 'mkpart primary ext3 2M -1'
+
+DEVINFO=$(kpartx -av $IMAGE) # 'add map loop1p1 (253:0): 0 6289408 linear /dev/loop1 2048'
+if [ -z "$DEVINFO" ] ; then
+  echo  Error setting up loopback device >&2
+  exit 1
+fi
+
+LOOP=$(echo ${DEVINFO} | sed 's/.* linear //; s/ [[:digit:]]*//') # '/dev/loop1'
+BLOCKDEV=$(echo "${DEVINFO}" | sed -e 's/.* (\(.*:.*\)).*/\1/')   # '253:0'
+LOOP_PART="$(echo ${DEVINFO##add map } | sed 's/ .*//')" # '/dev/loop1p1'
+TARGET="/dev/mapper/$LOOP_PART" # '/dev/mapper/loop1p1'
+
+echo "Debug:
+DEVINFO=$DEVINFO
+LOOP=$LOOP
+BLOCKDEV=$BLOCKDEV
+LOOP_PART=$LOOP_PART
+TARGET=$TARGET
+"
+
+blockdev --rereadpt $LOOP
+
+if test $grubonly = 0; then
+  echo FSCK=no >> /etc/debootstrap/config
+  echo y | grml-debootstrap --hostname vmbuilder --mirror http://debian.inode.at/debian/ -r squeeze -t "$TARGET" --password foobar
+fi
+
+kpartx -d $IMAGE
+LOOPDEV=$(losetup -f)
+losetup $LOOPDEV ${IMAGE}
+reread_partition_table $LOOP
+if test $grubonly = 1; then
+mke2fs /dev/$LOOP_PART
+fi
+mount /dev/$LOOP_PART $TMPDIR
+
+mkdir -p "$TMPDIR/boot/grub"
+cp /usr/lib/grub/i386-pc/* "$TMPDIR/boot/grub/"
+
+if test $grubonly = 0; then
+grml-chroot $TMPDIR update-grub
+
+sed -i "s;set root=.*;set root='(hd0,msdos1)';" $TMPDIR/boot/grub/grub.cfg
+# sed 's/insmod ext2/insmod ext2\n        insmod part_msdos/'  $TMPDIR/boot/grub/grub.cfg
+
+cat $TMPDIR/boot/grub/grub.cfg > /tmp/grub.cfg
+fi
+
+umount $TMPDIR
+rmdir $TMPDIR
+losetup -d "$LOOPDEV"
+
+echo 'done :)'
+
+# EOF