5b6716cee8
This cuts the image size down alot, esspecially if there were lots of small file deletes. The fstrim utility is in the util-linux package and should be on most all systems. fstrim also works with XFS, ext4, btrfs, etc prodiving the kernel is new enough. A reduction of 25% or more in size is common. Change-Id: I269b4416be450369616f9b8e030f84c30e329804
213 lines
8.1 KiB
Bash
213 lines
8.1 KiB
Bash
#!/bin/bash
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# Copyright 2012 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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function unmount_image () {
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# Calling sync before helps ensure the mount isn't busy when you unmount it.
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# Previously observing having disk corruption issues; one possibility is
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# qemu-nbd not flushing dirty pages on disconnect?
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# https://bugs.launchpad.net/diskimage-builder/+bug/1214388
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sync
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# unmount from the chroot
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# Don't use TMP_MOUNT_PATH here, it might not have been set.
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unmount_dir "$TMP_BUILD_DIR/mnt"
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if [ -n "$EXTRA_UNMOUNT" ]; then
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$EXTRA_UNMOUNT
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fi
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}
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function fstrim_image () {
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# A race condition can occur when trying to fstrim immediately after
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# deleting a file resulting in that free space not being reclaimed.
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# Calling sync before fstrim is a workaround for this behaviour.
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# https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg02978.html
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sync
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# Discard all unused bytes
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sudo fstrim "${TMP_BUILD_DIR}/mnt"
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}
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function trap_cleanup() {
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exitval=$?
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cleanup
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exit $exitval
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}
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function cleanup () {
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unmount_image
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cleanup_build_dir
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cleanup_image_dir
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}
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function ensure_nbd () {
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NBD=`which qemu-nbd` || true
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if [ -z "$NBD" ]; then
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echo "qemu-nbd is not found in your PATH"
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echo "Please install it on your system"
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exit 1
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fi
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# prep nbd for mounting
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(lsmod | grep '^nbd ' >/dev/null) || sudo modprobe nbd max_part=16
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}
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function ensure_sudo () {
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sudo echo "Ensuring sudo is available"
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}
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# Helper function to run a command inside the chroot
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function run_in_target () {
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cmd="$@"
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# -E to preserve http_proxy
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ORIG_HOME=$HOME
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export HOME=/root
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# Force an empty TMPDIR inside the chroot. There is no need to use an user
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# defined tmp dir which may not exist in the chroot.
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# Bug: #1330290
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# Force the inclusion of a typical set of dirs in PATH, this is needed for guest
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# distros that have path elements not in the host PATH.
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sudo -E TMPDIR= chroot $TMP_MOUNT_PATH env PATH="\$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" sh -c "$cmd"
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export HOME=$ORIG_HOME
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}
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# Helper function to run a directory of scripts inside the chroot
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function run_d_in_target () {
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check_element
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# If we can find a directory of hooks to run in the target filesystem, bind
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# mount it into the target and then execute run-parts in a chroot
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if [ -d ${TMP_HOOKS_PATH}/$1.d ] ; then
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sudo mkdir $TMP_MOUNT_PATH/tmp/in_target.d
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sudo mount --bind ${TMP_HOOKS_PATH} $TMP_MOUNT_PATH/tmp/in_target.d
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sudo mount -o remount,ro,bind ${TMP_HOOKS_PATH} $TMP_MOUNT_PATH/tmp/in_target.d
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check_break before-$1 run_in_target bash
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[ -z "$break_outside_target" ] && in_target_arg="run_in_target" || in_target_arg=
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trap "check_break after-error $in_target_arg ${break_cmd:-bash}" ERR
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run_in_target dib-run-parts /tmp/in_target.d/$1.d
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trap - ERR
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check_break after-$1 run_in_target bash
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sudo umount -f $TMP_MOUNT_PATH/tmp/in_target.d
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if ! timeout 5 sh -c " while ! sudo rmdir $TMP_MOUNT_PATH/tmp/in_target.d; do sleep 1; done"; then
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echo "ERROR: unable to cleanly remove $TMP_MOUNT_PATH/tmp/in_target.d"
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exit 1
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fi
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fi
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}
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function finalise_base () {
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TARGET_ROOT=$TMP_MOUNT_PATH run_d cleanup
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# If the file has been set immutable, we probably want to keep it
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if lsattr $TMP_MOUNT_PATH/etc/resolv.conf | grep '^....i' >/dev/null ; then
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# We're keeping the contents of resolv.conf set in the elements,
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# so remove the old saved file
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sudo rm -f $TMP_MOUNT_PATH/etc/resolv.conf.ORIG
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else
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# Remove the resolv.conf we created above
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sudo rm -f $TMP_MOUNT_PATH/etc/resolv.conf
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# Move the original back
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if [ -L $TMP_MOUNT_PATH/etc/resolv.conf.ORIG ] || [ -f $TMP_MOUNT_PATH/etc/resolv.conf.ORIG ] ; then
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sudo mv $TMP_MOUNT_PATH/etc/resolv.conf.ORIG $TMP_MOUNT_PATH/etc/resolv.conf
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fi
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fi
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# Cleanup /tmp in the guest, so there is less cruft left there
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unmount_dir $TMP_MOUNT_PATH/tmp
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find $TMP_MOUNT_PATH/tmp -maxdepth 1 -mindepth 1 | xargs sudo rm -rf --one-file-system
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}
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function compress_and_save_image () {
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# Recreate our image to throw away unnecessary data
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test $IMAGE_TYPE != qcow2 && COMPRESS_IMAGE=""
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if [ -n "$QEMU_IMG_OPTIONS" ]; then
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EXTRA_OPTIONS="-o $QEMU_IMG_OPTIONS"
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else
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EXTRA_OPTIONS=""
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fi
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if [ "$IMAGE_TYPE" = "raw" ]; then
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mv $TMP_IMAGE_PATH $1-new
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elif [ "$IMAGE_TYPE" == "vhd" ]; then
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cp $TMP_IMAGE_PATH $1-intermediate
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vhd-util convert -s 0 -t 1 -i $1-intermediate -o $1-intermediate
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vhd-util convert -s 1 -t 2 -i $1-intermediate -o $1-new
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# The previous command creates a .bak file
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rm $1-intermediate.bak
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OUT_IMAGE_PATH=$1-new
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else
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echo "Converting image using qemu-img convert"
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qemu-img convert ${COMPRESS_IMAGE:+-c} -f raw $TMP_IMAGE_PATH -O $IMAGE_TYPE $EXTRA_OPTIONS $1-new
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fi
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OUT_IMAGE_PATH=$1-new
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finish_image $1
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}
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function do_extra_package_install () {
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# Install any packages that were requested with the -p command line option
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if [ "$INSTALL_PACKAGES" != "" ]; then
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run_in_target install-packages ${INSTALL_PACKAGES[@]}
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fi
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}
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function copy_elements_lib () {
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sudo mkdir -p $TMP_MOUNT_PATH/lib/diskimage-builder
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sudo cp -t $TMP_MOUNT_PATH/lib/diskimage-builder $_LIB/elements-functions
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}
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# Dig up the initrd and kernel.
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function select_boot_kernel_initrd () {
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TARGET_ROOT=$1
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BOOTDIR=$TARGET_ROOT/boot
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if [ -n "${DIB_BAREMETAL_KERNEL_PATTERN:-}" -a -n "${DIB_BAREMETAL_INITRD_PATTERN:-}" ]; then
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KERNEL=$(basename $(eval ls -1rv "$BOOTDIR/${DIB_BAREMETAL_KERNEL_PATTERN}" | head -1))
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RAMDISK=$(basename $(eval ls -1rv "$BOOTDIR/${DIB_BAREMETAL_INITRD_PATTERN}" | head -1))
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elif [ -f $TARGET_ROOT/etc/redhat-release ]; then
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# Prioritize PAE if present
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KERNEL=$(ls -1rv $BOOTDIR/vmlinuz* | grep PAE | grep -v debug | head -1 || echo "")
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KERNEL=${KERNEL:-$(ls -1rv $BOOTDIR/vmlinuz* | grep -v debug | head -1 || echo "")}
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if [ ! $KERNEL ]; then
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echo "No suitable kernel found."
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exit 1
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fi
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KERNEL=$(basename $KERNEL)
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KERNEL_VERSION=${KERNEL#vmlinuz-}
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RAMDISK=$(basename $(ls $BOOTDIR/initramfs-$KERNEL_VERSION.img) || echo "")
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if [ ! $RAMDISK ]; then
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echo "Can't find an initramfs for the $KERNEL_VERSION version of the kernel."
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exit 1
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fi
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elif [ -f $TARGET_ROOT/etc/debian_version ]; then
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KERNEL=$(basename $(ls -1rv $BOOTDIR/vmlinu*generic 2>/dev/null || ls -1rv $BOOTDIR/vmlinu* | head -1))
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RAMDISK=$(basename $(ls -1rv $BOOTDIR/initrd*generic 2>/dev/null || ls -1rv $BOOTDIR/initrd* | head -1))
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if [ -f $TARGET_ROOT/dib-signed-kernel-version ] ; then
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. $TARGET_ROOT/dib-signed-kernel-version
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fi
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if [ -n "${DIB_SIGNED_KERNEL_VERSION:-}" ]; then
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echo "Using signed kernel $DIB_SIGNED_KERNEL_VERSION"
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KERNEL=$(basename $(ls -1rv $BOOTDIR/vmlinu*generic.efi.signed 2>/dev/null))
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fi
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elif [ -f $TARGET_ROOT/etc/SuSE-release ]; then
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KERNEL=$(basename $(readlink -e $BOOTDIR/vmlinuz))
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RAMDISK=$(basename $(readlink -e $BOOTDIR/initrd))
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elif [[ -f "${TARGET_ROOT}"/etc/gentoo-release ]]; then
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KERNEL="$(basename $(ls -1rv $BOOTDIR/kernel-*-openstack | head -n 1))"
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RAMDISK="$(basename $(ls -1rv $BOOTDIR/initramfs-*-openstack | head -n 1))"
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else
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echo "ERROR: Unable to detect operating system"
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exit 1
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fi
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}
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