create

#!/bin/bash

# instance-simpleimage - simple image-based OS provider for Ganeti
# Copyright (C) 2022 The Ganeti Project

# 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

. common.sh

teardown_loop() {
    if echo "$TARGET_DISK_DEVICE" | grep -q '^/dev/loop'; then
        losetup -d "$TARGET_DISK_DEVICE"
    fi
}

trap teardown_loop EXIT

# download the image if needed
if [[ "$OSP_IMAGE" == http://* ]] || [[ "$OSP_IMAGE" == https://* ]]; then
    mkdir -p "$IMAGE_STORAGE"

    # clean expired downloaded images
    find "$IMAGE_STORAGE" -type f -mtime +"$DOWNLOAD_CACHE_MAX_DAYS" -delete

    CHECKSUM=$(echo -n "$OSP_IMAGE" | sha1sum | cut -d " " -f1)
    OUTPUT_FILENAME=$IMAGE_STORAGE/$CHECKSUM

    if [[ ! -f "$OUTPUT_FILENAME" ]]; then
        echo "Running 'curl $CHECK_TLS_OPT -sfL $OSP_IMAGE --output $OUTPUT_FILENAME'" 1>&2
        if ! curl $CUSTOM_CURL_OPTS -sfL "$OSP_IMAGE" --output "$OUTPUT_FILENAME"; then
            echo "Unable to download remote image from '$OSP_IMAGE' to '$OUTPUT_FILE'" 1>&2
            exit 1
        fi
    else
        echo "$OUTPUT_FILENAME already present, skipping download of $OSP_IMAGE"
    fi
    DISK_IMAGE="$OUTPUT_FILENAME"
else
    DISK_IMAGE="$OSP_IMAGE"
fi

if [[ -b "$DISK_0_PATH" ]]; then
    TARGET_DISK_DEVICE=$DISK_0_PATH
elif [[ -f "$DISK_0_PATH" ]]; then
    echo "'$DISK_0_PATH' is a file, running 'losetup --show --find $DISK_0_PATH'" 1>&2
    TARGET_DISK_DEVICE=$(losetup --show --find "$DISK_0_PATH")
    echo "Using $TARGET_DISK_DEVICE as a target" 1>&2
else
    echo "'$DISK_0_PATH' is neither a blockdevice nor a regular file and cannot be handled by this OS provider!" 1>&2
    exit 1
fi

# make the target block device available to hooks
export TARGET_DISK_DEVICE

# store the image as the instance's first disk
if [[ -b "$TARGET_DISK_DEVICE" ]]; then
    case $OSP_IMAGE_TYPE in
    raw)
        echo "Running 'dd if=$DISK_IMAGE of=$TARGET_DISK_DEVICE bs=2M'" 1>&2
        if ! dd if="$DISK_IMAGE" of="$TARGET_DISK_DEVICE" bs=2M; then
            echo "dd of '$DISK_IMAGE' to '$TARGET_DISK_DEVICE' failed" 1>&2
            exit 1
        fi
    ;;
    raw+gz)
        echo "Running 'gunzip -c $DISK_IMAGE | dd of=$TARGET_DISK_DEVICE bs=2M'" 1>&2
        if ! gunzip -c "$DISK_IMAGE" | dd of="$TARGET_DISK_DEVICE" bs=2M; then
            echo "dd of '$DISK_IMAGE' to '$TARGET_DISK_DEVICE' failed" 1>&2
            exit 1
        fi
    ;;
    raw+bz2)
        echo "Running 'bunzip2 -c $DISK_IMAGE | dd of=$TARGET_DISK_DEVICE bs=2M'" 1>&2
        if ! bunzip2 -c "$DISK_IMAGE" | dd of="$TARGET_DISK_DEVICE" bs=2M; then
            echo "dd of '$DISK_IMAGE' to '$TARGET_DISK_DEVICE' failed" 1>&2
            exit 1
        fi
    ;;
    raw+xz)
        echo "Running 'unxz -c $DISK_IMAGE | dd of=$TARGET_DISK_DEVICE bs=2M'" 1>&2
        if ! unxz -c "$DISK_IMAGE" | dd of="$TARGET_DISK_DEVICE" bs=2M; then
            echo "dd of '$DISK_IMAGE' to '$TARGET_DISK_DEVICE' failed" 1>&2
            exit 1
        fi
    ;;
    qcow2)
        echo "Running 'qemu-img dd -F qcow2 -O raw if=$DISK_IMAGE of=$TARGET_DISK_DEVICE'" 1>&2
        if ! qemu-img dd -f qcow2 -O raw if="$DISK_IMAGE" of="$TARGET_DISK_DEVICE" bs=2M; then
            echo "Writing '$DISK_IMAGE' to '$TARGET_DISK_DEVICE' failed" 1>&2
            exit 1
        fi
    ;;
    esac
else
    echo "'$TARGET_DISK_DEVICE' is not a blockdevice, bye!" 1>&2
    exit 1
fi

if [ ! -d "$VARIANTS_HOOKS" ]; then
    echo "Hooks directory '$VARIANTS_HOOKS' does not exist - not running any hooks" 1>&2
    exit 0
fi

echo "Running hooks from '$VARIANTS_HOOKS'"
run-parts "$VARIANTS_HOOKS"