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# Copyright 2011 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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#   1. Redistributions of source code must retain the above copyright
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#      notice, this list of conditions and the following disclaimer.
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#
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#  2. Redistributions in binary form must reproduce the above copyright
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#     notice, this list of conditions and the following disclaimer in the
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#     documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and documentation are
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# those of the authors and should not be interpreted as representing official
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# policies, either expressed or implied, of GRNET S.A.
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AWK="awk"
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KPARTX="kpartx"
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LOSETUP="losetup"
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SFDISK="sfdisk"
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QEMU_IMG="qemu-img"
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INSTALL_MBR="install-mbr"
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TIMELIMIT="timelimit"
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PROGRESS_MONITOR="snf-progress-monitor"
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progress_monitor_support="@progress_monitor_support@"
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CLEANUP=( )
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add_cleanup() {
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    local cmd=""
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    for arg; do cmd+=$(printf "%q " "$arg"); done
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    CLEANUP+=("$cmd")
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}
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log_error() {
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    echo "$@" >&2
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}
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get_api5_arguments() {
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    GETOPT_RESULT=$*
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    # Note the quotes around `$TEMP': they are essential!
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    eval set -- "$GETOPT_RESULT"
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    while true; do
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        case "$1" in
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            -i|-n) instance=$2; shift 2;;
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            -o) old_name=$2; shift 2;;
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            -b) blockdev=$2; shift 2;;
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            -s) swapdev=$2; shift 2;;
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            --) shift; break;;
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            *)  log_error "Internal error!" >&2; exit 1;;
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        esac
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    done
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    if [ -z "$instance" -o -z "$blockdev" ]; then
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        log_error "Missing OS API Argument (-i, -n, or -b)"
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        exit 1
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    fi
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    if [ "$SCRIPT_NAME" != "export" -a -z "$swapdev"  ]; then
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        log_error "Missing OS API Argument -s (swapdev)"
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        exit 1
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    fi
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    if [ "$SCRIPT_NAME" = "rename" -a -z "$old_name"  ]; then
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        log_error "Missing OS API Argument -o (old_name)"
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        exit 1
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    fi
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}
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get_api10_arguments() {
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    if [ -z "$INSTANCE_NAME" -o -z "$HYPERVISOR" -o -z "$DISK_COUNT" ]; then
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        log_error "Missing OS API Variable:"
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        log_error "(INSTANCE_NAME HYPERVISOR or DISK_COUNT)"
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        exit 1
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    fi
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    instance=$INSTANCE_NAME
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    if [ $DISK_COUNT -lt 1 -o -z "$DISK_0_PATH" ]; then
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        log_error "At least one disk is needed"
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        exit 1
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    fi
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    if [ "$SCRIPT_NAME" = "export" ]; then
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        if [ -z "$EXPORT_DEVICE" ]; then
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        log_error "Missing OS API Variable EXPORT_DEVICE"
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    fi
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    blockdev=$EXPORT_DEVICE
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    elif [ "$SCRIPT_NAME" = "import" ]; then
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        if [ -z "$IMPORT_DEVICE" ]; then
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        log_error "Missing OS API Variable IMPORT_DEVICE"
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        fi
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        blockdev=$IMPORT_DEVICE
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    else
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        blockdev=$DISK_0_PATH
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    fi
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    if [ "$SCRIPT_NAME" = "rename" -a -z "$OLD_INSTANCE_NAME" ]; then
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        log_error "Missing OS API Variable OLD_INSTANCE_NAME"
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    fi
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    old_name=$OLD_INSTANCE_NAME
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}
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get_api20_arguments() {
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    get_api10_arguments
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    if [ -z "$OSP_IMG_ID" ]; then
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        log_error "Missing OS API Parameter: OSP_IMG_ID"
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        exit 1
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    fi
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    if [ -z "$OSP_IMG_FORMAT" ]; then
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        log_error "Missing OS API Parameter: OSP_IMG_FORMAT"
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        exit 1
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    fi
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    if [ -z "$OSP_IMG_PASSWD" ]; then
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        log_error "Missing OS API Parameter: OSP_IMG_PASSWD"
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        exit 1
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    fi
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    IMG_ID=$OSP_IMG_ID
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    IMG_FORMAT=$OSP_IMG_FORMAT
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    IMG_PASSWD=$OSP_IMG_PASSWD
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    if [ -n "$OSP_IMG_PERSONALITY" ]; then
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        IMG_PERSONALITY=$OSP_IMG_PERSONALITY
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    fi
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}
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map_disk0() {
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    blockdev="$1"
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    filesystem_dev_base=$($KPARTX -l -p- $blockdev | \
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                            grep -m 1 -- "-1.*$blockdev" | \
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                            $AWK '{print $1}')
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    if [ -z "$filesystem_dev_base" ]; then
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        log_error "Cannot interpret kpartx output and get partition mapping"
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        exit 1
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    fi
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    $KPARTX -a -p- "$blockdev" > /dev/null
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    filesystem_dev="/dev/mapper/${filesystem_dev_base/%-1/}"
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    if [ ! -b "/dev/mapper/$filesystem_dev_base" ]; then
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        log_error "Can't find kpartx mapped partition:" \
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                                            "/dev/mapper/$filesystem_dev_base"
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        exit 1
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    fi
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    echo "$filesystem_dev"
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}
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unmap_disk0() {
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    $KPARTX -d -p- "$1"
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}
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format_disk0() {
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    local device="$1"
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    local image_type="$2"
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    declare -A part_id=( ['extdump']="83" ["ntfsdump"]="7" )
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    # The -f is needed, because we use an optimal alignment and sfdisk complains
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    # about partitions not ending on clylinder boundary.
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    local sfdisk_cmd="$SFDISK -uS -H 255 -S 63 -f --quiet --Linux --DOS $device"
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    $sfdisk_cmd > /dev/null <<EOF
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2048,,${part_id["$image_type"]},*
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EOF
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}
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create_floppy() {
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    local img=$1
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    local target=$(mktemp -d)
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    add_cleanup rmdir "$target"
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    dd bs=512 count=2880 if=/dev/zero of="$img"
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    mkfs.ext2 -F "$img" > /dev/null
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    mount "$img" "$target" -o loop
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    set | egrep ^snf_export_\\w+=|sed -e 's/^snf_export_/SNF_IMAGE_/' | \
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    while read line; do
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        echo "export $line" >> "$target/rules"
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    done
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    umount "$target"
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}
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# this one is only to be called by create
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ganeti_os_main() {
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    if [ -z "$OS_API_VERSION" -o "$OS_API_VERSION" = "5" ]; then
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        OS_API_VERSION=5
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        GETOPT_RESULT=`getopt -o o:n:i:b:s: -n '$0' -- "$@"`
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        if [ $? != 0 ] ; then log_error "Terminating..."; exit 1 ; fi
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        get_api5_arguments $GETOPT_RESULT
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    elif [ "$OS_API_VERSION" = "10" -o "$OS_API_VERSION" = "15" ]; then
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        get_api10_arguments
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    elif [ "$OS_API_VERSION" = "20" ]; then
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        get_api20_arguments
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        IMAGE_NAME=$IMG_ID
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        IMAGE_TYPE=$IMG_FORMAT
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    else
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        log_error "Unknown OS API VERSION $OS_API_VERSION"
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        exit 1
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    fi
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    if [ -n "$OS_VARIANT" ]; then
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        if [ ! -d "$VARIANTS_DIR" ]; then
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            log_error "OS Variants directory $VARIANTS_DIR doesn't exist"
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            exit 1
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        fi
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        VARIANT_CONFIG="$VARIANTS_DIR/$OS_VARIANT.conf"
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        if [ -f "$VARIANT_CONFIG" ]; then
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            . "$VARIANT_CONFIG"
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        else
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            if grep -qxF "$OS_VARIANT" variants.list; then
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                log_error "ERROR: instance-image configuration error"
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                log_error "  Published variant $OS_VARIANT is missing its config" \
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                          "file"
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                log_error "  Please create $VARIANT_CONFIG or unpublish the variant"
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                log_error "  (by removing $OS_VARIANT from variants.list)"
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            else
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                log_error "Unofficial variant $OS_VARIANT is unsupported"
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                log_error "Most probably this is a user error, forcing a wrong name"
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                log_error "To support this variant please create file" \
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                            "$VARIANT_CONFIG"
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            fi
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            exit 1
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        fi
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    fi
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}
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cleanup() {
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# if something fails here, it souldn't call cleanup again...
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    trap - EXIT
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    if [ ${#CLEANUP[*]} -gt 0 ]; then
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        LAST_ELEMENT=$((${#CLEANUP[*]}-1))
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        REVERSE_INDEXES=$(seq ${LAST_ELEMENT} -1 0)
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        for i in $REVERSE_INDEXES; do
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            # If something fails here, it's better to retry it for a few times
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            # before we give up with an error. This is needed for kpartx when
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            # dealing with ntfs partitions mounted through fuse. umount is not
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            # synchronous and may return while the partition is still busy. A
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            # premature attempt to delete partition mappings through kpartx on a
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            # device that hosts previously mounted ntfs partition may fail with
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            # an  `device-mapper: remove ioctl failed: Device or resource busy'
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            # error. A sensible workaround for this is to wait for a while and
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            # then try again.
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            local cmd=${CLEANUP[$i]}
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            $cmd || for interval in 0.25 0.5 1 2 4; do
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            echo "Command $cmd failed!"
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            echo "I'll wait for $interval secs and will retry..."
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            sleep $interval
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            $cmd && break
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        done
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        if [ "$?" != "0" ]; then
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            echo "Giving Up..."
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            exit 1;
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        fi
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    done
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  fi
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}
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trap cleanup EXIT
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DEFAULT_FILE="@sysconfdir@/default/snf-image"
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if [ -f "$DEFAULT_FILE" ]; then
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    . "$DEFAULT_FILE"
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fi
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: ${ARCH:="x86_64"}
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: ${VARIANTS_DIR:="@sysconfdir@/ganeti/snf-image/variants"}
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: ${IMAGE_DIR:="@localstatedir@/lib/snf-image"}
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: ${HELPER_DIR:="@HELPER_DIR@"}
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: ${HELPER_IMG:="@HELPER_IMG@"}
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: ${HELPER_KERNEL:="@HELPER_KERNEL@"}
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: ${HELPER_INITRD:="@HELPER_INITRD@"}
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: ${HELPER_PKG:="@HELPER_DIR@/snf-image-helper.deb"}
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: ${HELPER_SOFT_TIMEOUT:=15}
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: ${HELPER_HARD_TIMEOUT:=5}
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: ${HELPER_USER:="nobody"}
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: ${HELPER_CACHE_FILE:="@HELPER_DIR@/cache.tar"}
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: ${HELPER_EXTRA_PKGS:="linux-image-amd64,e2fsprogs,ntfs-3g,ntfsprogs,xmlstarlet,python"}
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SCRIPT_NAME=$(basename $0)
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if [ -f /sbin/blkid -a -x /sbin/blkid ]; then
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    VOL_ID="/sbin/blkid -c /dev/null -o value -s UUID"
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    VOL_TYPE="/sbin/blkid -c /dev/null -o value -s TYPE"
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else
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    for dir in /lib/udev /sbin; do
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        if [ -f $dir/vol_id -a -x $dir/vol_id ]; then
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            VOL_ID="$dir/vol_id -u"
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            VOL_TYPE="$dir/vol_id -t"
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        fi
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    done
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fi
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if [ -z "$VOL_ID" ]; then
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    log_error "vol_id or blkid not found, please install udev or util-linux"
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    exit 1
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fi
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :