Synnefo » snf-image

#!/bin/bash

set -e

. @osdir@/common.sh

CACHE_FILE="$HELPER_DIR/cache.tar"

ARCH=amd64

EXTRA_PKGS="linux-image-amd64,e2fsprogs,ntfs-3g,ntfsprogs,xmlstarlet,python"

if [ ! -e "$HELPER_PKG" ]; then

    log_error "Helper package \`$HELPER_PKG' not found."

    log_error "You need to provide this for the script to work"

    exit 1

fi

cat >&1 <<EOF

This program will overwrite the following files:

  \`$HELPER_DIR/initrd'

  \`$HELPER_DIR/kernel'

  \`$HELPER_DIR/image'

EOF

while [[ 1 ]]; do

    echo -n "Do you want to continue [y/N]?"

    read answer

    [ "$(echo -n "$answer" | tr [A-Z] [a-z])" = "y" ] && break

    if [ -z "$answer" -o "$(echo -n "$answer" | tr [A-Z] [a-z])" = "n" ]; then

        log_error "Abord."

        exit 1

    fi

done

rm -f "$HELPER_DIR/initrd" "$HELPER_DIR/kernel" "$HELPER_DIR/image"

echo -n "Allocating space for helper disk image..."

helper_img=$(mktemp $HELPER_DIR/image.XXXXXXXX)

dd if=/dev/zero of=$helper_img bs=1k count=400000 &> /dev/null

echo "done"

blockdev=$(losetup -sf $helper_img)

CLEANUP+=("losetup -d $blockdev")

sleep 1 # sometimes losetup returns and the device is still busy..

echo -n "Creating partitions..."

format_disk0 $blockdev "extdump" 

echo "done"

root_dev=$(map_disk0 $blockdev)-1

CLEANUP+=("unmap_disk0 $blockdev")

mkfs.ext3 $root_dev

# The helper vm should never do filesystem checks...

tune2fs -i 0 -c 0 $root_dev

TMPDIR=$(mktemp -d)

CLEANUP+=("rmdir $TMPDIR")

mount $root_dev $TMPDIR

CLEANUP+=("umount $root_dev")

echo "Checking for cached root filesystem file \`$CACHE_FILE'..." 

if [  -f "$CACHE_FILE" ]; then

    echo "found"

    tar xf "$CACHE_FILE" -C $TMPDIR

else

    echo "not found"

    echo "Debootstraping to create a new root filesystem:"

    debootstrap --arch "$ARCH" --include $EXTRA_PKGS --variant=minbase \

	    squeeze $TMPDIR

    # remove the downloaded debs, as they are no longer needed

    find "$TMPDIR/var/cache/apt/archives" -type f -name '*.deb' -print0 | \

        xargs -r0 rm -f

    TMP_CACHE=$(mktemp "${CACHE_FILE}.XXXXXX")

    tar cf "$TMP_CACHE" -C $TMPDIR .

    mv -f "$TMP_CACHE" "$CACHE_FILE"

fi

echo -n "Configureing filesystem..."

echo helper > $TMPDIR/etc/hostname

cat > $TMPDIR/etc/fstab <<EOF

# /etc/fstab: static file system information.

#

# <file system>   <mount point>   <type>  <options>       <dump>  <pass>

/dev/sda1         /               ext3    defaults        0       1

proc              /proc           proc    defaults        0       0

EOF

echo "done"

echo -n "Extracting kernel..."

if [ ! -L "$TMPDIR/vmlinuz" -o ! -L "$TMPDIR/vmlinuz" ]; then

	log_error "vmlinuz or initrd.img link in root is missing."

	log_error "I don't know how to find a usable kernel/initrd pair."

	exit 1

fi

echo "done"

kernel=$(readlink -en $TMPDIR/vmlinuz)

initrd=$(readlink -en $TMPDIR/initrd.img)

echo "Moving $(basename $kernel) and $(basename $initrd) to $HELPER_DIR"

mv $kernel $initrd $HELPER_DIR

kernel=$(basename $kernel)

initrd=$(basename $initrd)

(cd $HELPER_DIR; ln -fs $kernel kernel; ln -fs $initrd initrd)

rm $TMPDIR/vmlinuz $TMPDIR/initrd.img

echo "Installing snf-image-helper pkg in the new image..."

cp $HELPER_PKG $TMPDIR/tmp/

pkg_name=$(basename "$HELPER_PKG")  

CLEANUP+=("rm $TMPDIR/tmp/$pkg_name")

chroot ${TMPDIR} dpkg -i /tmp/$pkg_name

cat > ${TMPDIR}/etc/rc.local <<EOF

#!/bin/sh -e

#

# rc.local

#

# This script is executed at the end of each multiuser runlevel.

# Make sure that the script will "exit 0" on success or any other

# value on error.

#

# In order to enable or disable this script just change the execution

# bits.

#

# By default this script does nothing.

/usr/bin/snf-image-helper

exit 0

EOF

chmod +x ${TMPDIR}/etc/rc.local

echo "done"

cleanup

mv $helper_img $HELPER_DIR/image

trap - EXIT

exit 0

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