diskimage-builder/lib/img-functions

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# Copyright 2012 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
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# 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
#
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# http://www.apache.org/licenses/LICENSE-2.0
#
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# 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.
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function unmount_image () {
# unmount from the chroot
# Don't use TMP_MOUNT_PATH here, it might not have been set.
sudo umount -f $TMP_BUILD_DIR/mnt/sys || true
sudo umount -f $TMP_BUILD_DIR/mnt/proc || true
sudo umount -f $TMP_BUILD_DIR/mnt/dev || true
sudo umount -f $TMP_BUILD_DIR/mnt/tmp/in_target.d || true
# give it a second (ok really 5) to umount XXX - why? should instead track
# the mount data / lsof etc.
sleep 5
# oh ya don't want to forget to unmount the image
sudo umount -f $TMP_BUILD_DIR/mnt || true
# having disk corruption issues; one possibility is qemu-nbd not flush dirty
# pages on disconnect?
sync
if [ -n "$EXTRA_UNMOUNT" ]; then
$EXTRA_UNMOUNT
fi
}
function cleanup () {
unmount_image
rm -rf $TMP_BUILD_DIR
}
function ensure_nbd () {
NBD=`which qemu-nbd` || true
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if [ -z "$NBD" ]; then
echo "Need qemu-nbd to build qcow2 files."
sudo apt-get install qemu-utils
fi
# prep nbd for mounting
(lsmod | grep '^nbd ') || sudo modprobe nbd max_part=16
}
function ensure_sudo () {
sudo echo "Ensuring sudo is available"
}
function mount_tmp_image () {
mkdir $TMP_BUILD_DIR/mnt
sudo mount $@ $TMP_BUILD_DIR/mnt
[ $? -eq 0 ] || die "Failed to mount image"
export TMP_MOUNT_PATH=$TMP_BUILD_DIR/mnt
}
function create_base () {
# Copy data in to the root.
TARGET_ROOT=$TMP_MOUNT_PATH run_d root
if [ -z "$(ls $TMP_MOUNT_PATH | grep -v lost+found)" ] ; then
# Nothing copied in, use Ubuntu.
echo "Adding ubuntu element as / had no contents"
IMAGE_ELEMENT=$($SCRIPT_HOME/element-info --expand-dependencies $IMAGE_ELEMENT ubuntu)
generate_hooks
echo "Now building: $IMAGE_ELEMENT"
TARGET_ROOT=$TMP_MOUNT_PATH run_d root
fi
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# Configure Image
# Setup resolv.conf so we can chroot to install some packages
# XXXX: Should store the old state rather than unlink; then restore later.
if [ -L $TMP_MOUNT_PATH/etc/resolv.conf ] ; then
sudo unlink $TMP_MOUNT_PATH/etc/resolv.conf
fi
if [ -f $TMP_MOUNT_PATH/etc/resolv.conf ] ; then
sudo rm -f $TMP_MOUNT_PATH/etc/resolv.conf
fi
# Recreate resolv.conf
sudo touch $TMP_MOUNT_PATH/etc/resolv.conf
sudo chmod 777 $TMP_MOUNT_PATH/etc/resolv.conf
# use system configured resolv.conf if available to support internal proxy resolving
if [ -e /etc/resolv.conf ]
then
cat /etc/resolv.conf > $TMP_MOUNT_PATH/etc/resolv.conf
else
echo nameserver 8.8.8.8 > $TMP_MOUNT_PATH/etc/resolv.conf
fi
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# supporting kernel file systems
sudo mount -t proc none $TMP_MOUNT_PATH/proc
sudo mount --bind /dev $TMP_MOUNT_PATH/dev
sudo mount -t sysfs none $TMP_MOUNT_PATH/sys
}
# Helper function to run a command inside the chroot
function run_in_target() {
# -E to preserve http_proxy
sudo -E chroot $TMP_MOUNT_PATH "$@"
}
# Helper function to run a directory of scripts inside the chroot
function run_d_in_target() {
check_element
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# 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
check_break before-$1 run_in_target bash
run_in_target run-parts /tmp/in_target.d/$1.d
check_break after-$1 run_in_target bash
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sudo umount -f $TMP_MOUNT_PATH/tmp/in_target.d
sudo rmdir $TMP_MOUNT_PATH/tmp/in_target.d
fi
}
# Run a directory of hooks outside the target.
function run_d() {
check_element
check_break before-$1 bash
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if [ -d ${TMP_HOOKS_PATH}/$1.d ] ; then
run-parts ${TMP_HOOKS_PATH}/$1.d
fi
check_break after-$1 bash
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}
function prepare_first_boot () {
check_break before-first-boot run_in_target bash
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if [ -d ${TMP_HOOKS_PATH}/first-boot.d ] ; then
sudo cp -t $TMP_MOUNT_PATH/etc/ -a $TMP_HOOKS_PATH/first-boot.d
run_in_target mv /etc/rc.local /etc/rc.local.REAL
sudo dd of=$TMP_MOUNT_PATH/etc/rc.local <<EOF
#!/bin/bash
set -e
set -o xtrace
run-parts /etc/first-boot.d
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rm -fr /etc/first-boot.d
mv /etc/rc.local.REAL /etc/rc.local
exit 0
EOF
run_in_target chmod 755 /etc/rc.local
fi
check_break after-first-boot run_in_target bash
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}
function finalise_base () {
TARGET_ROOT=$TMP_MOUNT_PATH run_d cleanup
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# Now remove the resolv.conf we created above
sudo rm -f $TMP_MOUNT_PATH/etc/resolv.conf
# The we need to recreate it as a link
sudo ln -sf ../run/resolvconf/resolv.conf $TMP_MOUNT_PATH/etc/resolv.conf
}
function compress_image () {
# Recreate our image to throw away unnecessary data
qemu-img convert ${COMPRESS_IMAGE:+-c} $TMP_IMAGE_PATH -O qcow2 $TMP_IMAGE_PATH-new
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rm $TMP_IMAGE_PATH
mv $TMP_IMAGE_PATH-new $TMP_IMAGE_PATH
}
function do_extra_package_install () {
# Install any packages that were requested with the -p command line option
if [ "$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
}