Synnefo » snf-image

#!/bin/bash

# Copyright (C) 2011 GRNET S.A. 

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

set -e

set -o pipefail

. common.sh

# Save stderr to a file

stderr=$(mktemp)

add_cleanup rm "$stderr"

exec 2> >(tee -a "$stderr" >&2)

monitor_pipe=$(mktemp -u)

mkfifo -m 600 "$monitor_pipe"

add_cleanup rm -f "$monitor_pipe"

if [ -n "$PROGRESS_MONITOR" ]; then

    { sleep 1; $PROGRESS_MONITOR "$instance" < "$monitor_pipe" ; } &

    monitor_pid="$!"

else

    cat "$monitor_pipe" &

    monitor_pid="$!"

fi

# Create file descriptor to monitor_pipe

exec {MONITOR_FD}>${monitor_pipe}

add_cleanup  close_fd ${MONITOR_FD}

# Ignore sigpipe signals. If progress monitor is dead and snf-image-host tries

# to output something to the opened pipe, then a sigpipe will be raised. If we

# do not catch this, the program will terminate.

trap "" SIGPIPE

trap "report_and_cleanup $(printf "%q" "$stderr") ${MONITOR_FD}" EXIT

ganeti_os_main

case $BACKEND_TYPE in

    local)

        image_file="$IMAGE_DIR/$(echo "$IMAGE_NAME" | sed 's/^file://').$IMAGE_TYPE"

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

            log_error "Image file \`$image_file' does not exit."

            exit 1

        fi

        image_size="$(stat -L -c %s "$image_file")"

        ;;

    network)

        image_cmd="$CURL $(printf "%q" "$IMAGE_NAME") 2> /dev/null"

        image_size=$($CURL -sI "$IMAGE_NAME" | grep ^Content-Length: | cut -d" " -f2)

        ;;

    pithos)

        cmd_args="--db $(printf "%q" "${PITHOS_DB}") \

                  --data $(printf "%q" "${PITHOS_DATA}") \

                  $(printf "%q" "${IMAGE_NAME}")"

        image_cmd="./pithcat $cmd_args"

        image_size=$(./pithcat -s  $cmd_args)

        ;;

esac

# If the target device is not a real block device we'll first losetup it.

# This is needed for file disks.

if [ ! -b "$blockdev" ]; then

    original_blockdev="$blockdev"

    blockdev=$($LOSETUP -sf "$blockdev")

    add_cleanup $LOSETUP -d "$blockdev"

fi

case "$IMAGE_TYPE" in

    ntfsdump|extdump)

        # Create partitions

        format_disk0 "$blockdev" "$IMAGE_TYPE"

        # Install a new MBR

        $INSTALL_MBR -p 1 -i n "$blockdev"

        target="$(map_disk0 "$blockdev")-1" #the root device

        add_cleanup unmap_disk0 "$blockdev"

        snf_export_PROPERTY_ROOT_PARTITION=1

        if [ "$IMAGE_TYPE" = "ntfsdump" ]; then

            snf_export_PROPERTY_OSFAMILY="windows"

        else

            snf_export_PROPERTY_OSFAMILY="linux"

        fi

        ;;

    diskdump)

        target="$blockdev"

        ;;

    *)

        log_error "Unknown Image format: \`$IMAGE_TYPE'"

        exit 1

        ;;

esac

monitor="./copy-monitor.py -o $MONITOR_FD -r $image_size"

if [ "$BACKEND_TYPE" = "local" ]; then

    # dd the dump to its new home :-)

    # Deploying an image file on a target block device is a streaming copy

    # operation. Enable the direct I/O flag on the output fd to avoid polluting

    # the host cache with useless data.

    $monitor dd bs=4M if="$image_file" of="$target" oflag=direct

else

    $image_cmd | $monitor dd bs=4M of="$target" oflag=direct

fi

# Create a floppy image

floppy=$(mktemp --tmpdir floppy.XXXXXX)

add_cleanup rm "$floppy"

snf_export_DEV=/dev/vda

snf_export_TYPE="$IMG_FORMAT"

snf_export_PASSWORD="$IMG_PASSWD"

snf_export_HOSTNAME="$instance"

if [ -n "$IMG_PROPERTIES" ]; then

    snf_export_PROPERTIES="$IMG_PROPERTIES"

fi

if [ -n "$IMG_PERSONALITY" ]; then

    snf_export_PERSONALITY="$IMG_PERSONALITY"

fi

create_floppy "$floppy"

# Invoke the helper vm to do the dirty job...

jail=$(mktemp -d --tmpdir tmpfsXXXXXXX)

add_cleanup rmdir "$jail"

mount tmpfs -t tmpfs "$jail" -o size=50M

add_cleanup umount "$jail"

result_file=$(mktemp --tmpdir="$jail" result.XXXXXX)

add_cleanup rm "$result_file"

snapshot=$(mktemp --tmpdir="$jail" helperXXXXXX.img)

add_cleanup rm "$snapshot"

"$QEMU_IMG" create -f qcow2 -b "$HELPER_IMG" "$snapshot"

echo "$(date +%Y:%m:%d-%H:%M:%S.%N) Starting helper VM..."

$TIMELIMIT -t "$HELPER_SOFT_TIMEOUT" -T "$HELPER_HARD_TIMEOUT" \

    kvm -runas "$HELPER_USER" -drive file="$snapshot" \

    -drive file="$blockdev",format=raw,if=virtio,cache=none \

    -boot c -serial stdio -serial "file:$(printf "%q" "$result_file")" \

    -serial "file:$(printf "%q" "$monitor_pipe")" \

    -fda "$floppy" -vga none -nographic -parallel none -monitor null \

    -kernel "$HELPER_KERNEL" -initrd "$HELPER_INITRD" \

    -append "quiet ro root=/dev/sda1 console=ttyS0,9600n8 snf_image_activate_helper" \

    2>&1 | sed 's|^|HELPER: |g'

echo "$(date +%Y:%m:%d-%H:%M:%S.%N) Helper VM finished."

if [ $? -ne 0 ]; then

    if [ $? -gt 128 ];  then

        log_error "Helper was terminated. Did not finish on time."

    fi

    exit 1

fi

# Do not report errors after this. If the result is not "SUCCESS" then the

# helper VM should have reported the error.

trap cleanup EXIT

# Read the first line. This will remove \r and \n chars

result=$(sed 's|\r||g' "$result_file" | head -1)

if [ "x$result" != "xSUCCESS" ]; then

    log_error "Helper VM returned error:"

    log_error "$result"

    exit 1

fi

# Execute cleanups

cleanup

trap - EXIT

exit 0

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