# Copyright 2012 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

function unmount_image () {
    # Calling sync before helps ensure the mount isn't busy when you unmount it.
    # Previously observing having disk corruption issues; one possibility is
    # qemu-nbd not flushing dirty pages on disconnect?
    # https://bugs.launchpad.net/diskimage-builder/+bug/1214388
    sync

    # unmount from the chroot
    # Don't use TMP_MOUNT_PATH here, it might not have been set.
    local MOUNTS
    MOUNTS=$(grep < /proc/mounts " $TMP_BUILD_DIR/mnt" | awk '{ print $2 }' | sort -r)
    for M in $MOUNTS; do
        sudo umount -fl $M || true
    done
    if [ -n "$EXTRA_UNMOUNT" ]; then
        $EXTRA_UNMOUNT
    fi
}

function cleanup () {
    unmount_image
    cleanup_dirs
}

function ensure_nbd () {
    NBD=`which qemu-nbd` || true
    if [ -z "$NBD" ];  then
        echo "qemu-nbd is not found in your PATH"
        echo "Please install it on your system"
        exit 1
    fi
    # prep nbd for mounting
    (lsmod | grep '^nbd ') || sudo modprobe nbd max_part=16
}

function ensure_sudo () {
    sudo echo "Ensuring sudo is available"
}

# Helper function to run a command inside the chroot
function run_in_target () {
    # Force the inclusion of /usr/local/bin in PATH, this is needed for some
    # distros that does not include /usr/local/bin in the sudoers secure_path.
    # Note that we're not expanding PATH during argument processing, the \$
    # will preserve the PATH syntax until after the sh command runs
    cmd="PATH=\$PATH:/usr/local/bin ; $@"
    # -E to preserve http_proxy
    ORIG_HOME=$HOME
    export HOME=/root
    sudo -E chroot $TMP_MOUNT_PATH sh -c "$cmd"
    export HOME=$ORIG_HOME
}

# Helper function to run a directory of scripts inside the chroot
function run_d_in_target () {
    check_element
    # If we can find a directory of hooks to run in the target filesystem, bind
    # mount it into the target and then execute run-parts in a chroot
    if [ -d ${TMP_HOOKS_PATH}/$1.d ] ; then
      sudo mkdir $TMP_MOUNT_PATH/tmp/in_target.d
      sudo mount --bind ${TMP_HOOKS_PATH} $TMP_MOUNT_PATH/tmp/in_target.d
      sudo mount -o remount,ro,bind ${TMP_HOOKS_PATH} $TMP_MOUNT_PATH/tmp/in_target.d
      sudo mkdir -p $TMP_MOUNT_PATH/tmp/ccache
      mkdir -p $DIB_CCACHE_DIR
      sudo mount --bind $DIB_CCACHE_DIR $TMP_MOUNT_PATH/tmp/ccache
      check_break before-$1 run_in_target bash
      trap "check_break after-error run_in_target bash" ERR
      run_in_target dib-run-parts /tmp/in_target.d/$1.d
      trap - ERR
      check_break after-$1 run_in_target bash
      sudo umount -f $TMP_MOUNT_PATH/tmp/in_target.d
      sudo rmdir $TMP_MOUNT_PATH/tmp/in_target.d
    fi
}

function prepare_first_boot () {
    check_break before-first-boot run_in_target bash
    if [ -d ${TMP_HOOKS_PATH}/first-boot.d ] ; then
      sudo cp -t $TMP_MOUNT_PATH/etc/ -a $TMP_HOOKS_PATH/first-boot.d
    fi
    check_break after-first-boot run_in_target bash
}

function finalise_base () {
    TARGET_ROOT=$TMP_MOUNT_PATH run_d cleanup
    # Remove the resolv.conf we created above
    sudo rm -f $TMP_MOUNT_PATH/etc/resolv.conf
    # Move the original back
    if [ -L $TMP_MOUNT_PATH/etc/resolv.conf.ORIG ] || [ -f $TMP_MOUNT_PATH/etc/resolv.conf.ORIG ] ; then
        sudo mv $TMP_MOUNT_PATH/etc/resolv.conf.ORIG $TMP_MOUNT_PATH/etc/resolv.conf
    fi
}

function compress_and_save_image () {
    # Recreate our image to throw away unnecessary data
    test $IMAGE_TYPE != qcow2 && COMPRESS_IMAGE=""
    qemu-img convert ${COMPRESS_IMAGE:+-c} -f raw $TMP_IMAGE_PATH -O $IMAGE_TYPE $1-new
    rm $TMP_IMAGE_PATH

    TMP_IMAGE_PATH=$1-new
    save_image $1
    remove_image
}

function remove_image () {
  echo "Removing $TMP_IMAGE_PATH"
  rm $TMP_IMAGE_PATH
}

function do_extra_package_install () {
  # Install any packages that were requested with the -p command line option
  if [ "$INSTALL_PACKAGES" != "" ]; then
    run_in_target install-packages ${INSTALL_PACKAGES[@]}
  fi
}

function copy_elements_lib () {
  sudo mkdir -p $TMP_MOUNT_PATH/lib/diskimage-builder
  sudo cp -t $TMP_MOUNT_PATH/lib/diskimage-builder $_LIB/elements-functions
}