Synnefo » Ganeti Instance Image

#

# Copyright (C) 2007, 2008, 2009 Google Inc.

#

# 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.

AWK="@AWK@"

DUMP="@DUMP@"

LOSETUP="@LOSETUP@"

KPARTX="@KPARTX@"

SFDISK="@SFDISK@"

QEMU_IMG="@QEMU_IMG@"

MKDIR_P="@MKDIR_P@"

CLEANUP=( )

log_error() {

  echo "$@" >&2

}

debug() {

    [ "$IMAGE_DEBUG" == "1" -o "$IMAGE_DEBUG" == "yes" ] &&  $@ || :

}

get_api5_arguments() {

  GETOPT_RESULT=$*

  # Note the quotes around `$TEMP': they are essential!

  eval set -- "$GETOPT_RESULT"

  while true; do

    case "$1" in

      -i|-n) instance=$2; shift 2;;

      -o) old_name=$2; shift 2;;

      -b) blockdev=$2; shift 2;;

      -s) swapdev=$2; shift 2;;

      --) shift; break;;

      *)  log_error "Internal error!" >&2; exit 1;;

    esac

  done

  if [ -z "$instance" -o -z "$blockdev" ]; then

    log_error "Missing OS API Argument (-i, -n, or -b)"

    exit 1

  fi

  if [ "$SCRIPT_NAME" != "export" -a -z "$swapdev"  ]; then

    log_error "Missing OS API Argument -s (swapdev)"

    exit 1

  fi

  if [ "$SCRIPT_NAME" = "rename" -a -z "$old_name"  ]; then

    log_error "Missing OS API Argument -o (old_name)"

    exit 1

  fi

}

get_api10_arguments() {

  if [ -z "$INSTANCE_NAME" -o -z "$HYPERVISOR" -o -z "$DISK_COUNT" ]; then

    log_error "Missing OS API Variable:"

    log_error "(INSTANCE_NAME HYPERVISOR or DISK_COUNT)"

    exit 1

  fi

  instance=$INSTANCE_NAME

  if [ $DISK_COUNT -lt 1 -o -z "$DISK_0_PATH" ]; then

    log_error "At least one disk is needed"

    exit 1

  fi

  if [ "$SCRIPT_NAME" = "export" ]; then

    if [ -z "$EXPORT_DEVICE" ]; then

      log_error "Missing OS API Variable EXPORT_DEVICE"

    fi

    blockdev=$EXPORT_DEVICE

  elif [ "$SCRIPT_NAME" = "import" ]; then

    if [ -z "$IMPORT_DEVICE" ]; then

       log_error "Missing OS API Variable IMPORT_DEVICE"

    fi

    blockdev=$IMPORT_DEVICE

  else

    blockdev=$DISK_0_PATH

  fi

  if [ "$SCRIPT_NAME" = "rename" -a -z "$OLD_INSTANCE_NAME" ]; then

    log_error "Missing OS API Variable OLD_INSTANCE_NAME"

  fi

  old_name=$OLD_INSTANCE_NAME

}

get_api20_parameters() {

  if [ -z "$OSP_IMG_ID" -o -z "$OSP_IMG_FORMAT" -o -z "$OSP_IMG_PASSWD" ]; then

    log_error "Missing OS API Parameter:"

    log_error "(OSP_IMG_ID or OSP_IMG_FORMAT or OSP_IMG_PASSWD)"

    exit 1

  fi

  IMG_ID=$OSP_IMG_ID

  IMG_FORMAT=$OSP_IMG_FORMAT

  IMG_PASSWD=$OSP_IMG_PASSWD

}

mount_disk0() {

    local target=$1

    mount $root_dev $target

    CLEANUP+=("umount $target")

    if [ -n "${boot_dev}" ] ; then

        $MKDIR_P $target/boot

        mount $boot_dev $target/boot

        CLEANUP+=("umount $target/boot")

    fi

    # sync the file systems before unmounting to ensure everything is flushed

    # out

    CLEANUP+=("sync")

}

map_disk0() {

    blockdev="$1"

    filesystem_dev_base=`$KPARTX -l -p- $blockdev | \

                            grep -m 1 -- "-1.*$blockdev" | \

                            $AWK '{print $1}'`

    if [ -z "$filesystem_dev_base" ]; then

        log_error "Cannot interpret kpartx output and get partition mapping"

        exit 1

    fi

    $KPARTX -a -p- $blockdev > /dev/null

    filesystem_dev="/dev/mapper/${filesystem_dev_base/%-1/}"

    if [ ! -b "/dev/mapper/$filesystem_dev_base" ]; then

        log_error "Can't find kpartx mapped partition: /dev/mapper/$filesystem_dev_base"

        exit 1

    fi

    echo "$filesystem_dev"

}

map_partition() {

    filesystem_dev="$1"

    partition="$2"

    if [ "${SWAP}" = "yes" -a -z "${KERNEL_PATH}" ] ; then

        boot_dev="${filesystem_dev}-1"

        swap_dev="${filesystem_dev}-2"

        root_dev="${filesystem_dev}-3"

    elif [ "${SWAP}" = "no" -a -z "${KERNEL_PATH}" ] ; then

        boot_dev="${filesystem_dev}-1"

        root_dev="${filesystem_dev}-2"

    elif [ "${SWAP}" = "yes" -a -n "${KERNEL_PATH}" ] ; then

        swap_dev="${filesystem_dev}-1"

        root_dev="${filesystem_dev}-2"

    elif [ "${SWAP}" = "no" -a -n "${KERNEL_PATH}" ] ; then

        root_dev="${filesystem_dev}-1"

    fi

    echo "$(eval "echo \${$(echo ${partition}_dev)"})"

}

unmap_disk0() {

  $KPARTX -d -p- $1

}

cleanup() {

  # if something fails here, it souldn't call cleanup again...

  trap - EXIT

  if [ ${#CLEANUP[*]} -gt 0 ]; then

    LAST_ELEMENT=$((${#CLEANUP[*]}-1))

    REVERSE_INDEXES=$(seq ${LAST_ELEMENT} -1 0)

    for i in $REVERSE_INDEXES; do

        # If something fails here, it's better to retry it for a few times

        # before we give up with an error. This is needed for kpartx when

        # dealing with ntfs partitions mounted through fuse. umount is not

        # synchronous and may return while the partition is still busy. A

        # premature attempt to delete partition mappings through kpartx on a

        # device that hosts previously mounted ntfs partition may fail with an 

        # `device-mapper: remove ioctl failed: Device or resource busy'

        # error. A sensible workaround for this is to wait for a while and then

        # try again.

        local cmd=${CLEANUP[$i]}

        $cmd || for interval in 0.25 0.5 1 2 4; do

            echo "Command $cmd failed!"

            echo "I'll wait for $interval secs and will retry..."

            sleep $interval

            $cmd && break

        done

        test $? -eq 1 && { echo "Giving Up..."; exit 1; }

    done

  fi

  echo "Clean UP executed"

}

trap cleanup EXIT

DEFAULT_FILE="@DEFAULT_DIR@/ganeti-instance-image"

if [ -f "$DEFAULT_FILE" ]; then

    . "$DEFAULT_FILE"

fi

# note: we don't set a default mirror since debian and ubuntu have

# different defaults, and it's better to use the default

# only if the user want to specify a mirror in the defaults file we

# will use it, this declaration is to make sure the variable is set

: ${CDINSTALL:="no"}

: ${SWAP:="yes"}

: ${SWAP_SIZE:="${INSTANCE_BE_memory}"}

: ${FILESYSTEM:="ext3"}

: ${KERNEL_ARGS=""}

: ${OVERLAY=""}

: ${IMAGE_NAME:=""}

: ${IMAGE_TYPE:="dump"}

: ${NOMOUNT:="no"}

: ${ARCH:=""}

: ${CUSTOMIZE_DIR:="@sysconfdir@/ganeti/instance-image/hooks"}

: ${VARIANTS_DIR:="@sysconfdir@/ganeti/instance-image/variants"}

: ${NETWORKS_DIR:="@sysconfdir@/ganeti/instance-image/networks"}

: ${OVERLAYS_DIR:="@sysconfdir@/ganeti/instance-image/overlays"}

: ${IMAGE_DIR:="@localstatedir@/cache/ganeti-instance-image"}

: ${IMAGE_DEBUG:="no"}

: ${TOOLS_DIR:="@OS_DIR@/@OS_NAME@/tools"}

SCRIPT_NAME=$(basename $0)

KERNEL_PATH="$INSTANCE_HV_kernel_path"

if [ -f /sbin/blkid -a -x /sbin/blkid ]; then

    VOL_ID="/sbin/blkid -c /dev/null -o value -s UUID"

    VOL_TYPE="/sbin/blkid -c /dev/null -o value -s TYPE"

else

    for dir in /lib/udev /sbin; do

        if [ -f $dir/vol_id -a -x $dir/vol_id ]; then

            VOL_ID="$dir/vol_id -u"

            VOL_TYPE="$dir/vol_id -t"

        fi

    done

fi

if [ -z "$VOL_ID" ]; then

    log_error "vol_id or blkid not found, please install udev or util-linux"

    exit 1

fi

if [ -z "$OS_API_VERSION" -o "$OS_API_VERSION" = "5" ]; then

  OS_API_VERSION=5

  GETOPT_RESULT=`getopt -o o:n:i:b:s: -n '$0' -- "$@"`

  if [ $? != 0 ] ; then log_error "Terminating..."; exit 1 ; fi

  get_api5_arguments $GETOPT_RESULT

elif [ "$OS_API_VERSION" = "10" -o "$OS_API_VERSION" = "15" ]; then

  get_api10_arguments

elif [ "$OS_API_VERSION" = "20" ]; then

  get_api10_arguments

  get_api20_parameters

  IMAGE_NAME=$IMG_ID

  IMAGE_TYPE=$IMG_FORMAT

else

  log_error "Unknown OS API VERSION $OS_API_VERSION"

  exit 1

fi

if [ -n "$OS_VARIANT" ]; then

  if [ ! -d "$VARIANTS_DIR" ]; then

    log_error "OS Variants directory $VARIANTS_DIR doesn't exist"

    exit 1

  fi

  VARIANT_CONFIG="$VARIANTS_DIR/$OS_VARIANT.conf"

  if [ -f "$VARIANT_CONFIG" ]; then

    . "$VARIANT_CONFIG"

  else

    if grep -qxF "$OS_VARIANT" variants.list; then

      log_error "ERROR: instance-image configuration error"

      log_error "  Published variant $OS_VARIANT is missing its config file"

      log_error "  Please create $VARIANT_CONFIG or unpublish the variant"

      log_error "  (by removing $OS_VARIANT from variants.list)"

    else

      log_error "Unofficial variant $OS_VARIANT is unsupported"

      log_error "Most probably this is a user error, forcing a wrong name"

      log_error "To support this variant please create file $VARIANT_CONFIG"

    fi

    exit 1

  fi

fi