diskimage-builder/diskimage_builder/lib/disk-image-create
Tobias Henkel eff5b2312b
Add a post-root.d phase
While trying to get docker image pre-caching to work we couldn't get a
docker daeomon to run within the chrooted environment. However we got
docker running with the help of bwrap outside of the chrooted
environment. The only option so far for this is the block-device.d
phase. But this has the problem that it runs after the image size has
been calculated. This leads to broken builds if the docker images
being pulled are big.

This can be solved by adding a post-root.d phase that runs outside the
chroot but before the image size calculation.

Change-Id: I36c2a81e2d9f5069f18ce5b0d52c5f1c7212c3ae
2018-10-19 10:33:56 +02:00

574 lines
22 KiB
Bash

#!/bin/bash
#
# Copyright 2012 Hewlett-Packard Development Company, L.P.
#
# 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.
set -eE
# Set/override locale. This ensures consistency in sorting etc. We
# need to choose a lowest-common denominator locale, as this is
# applied when running in the building chroot too (maybe a bug and we
# should prune this?). Thus "C" --centOS 7 doesn't include C.utf-8
# (fedora does, centos 8 probably will). Note: LC_ALL to really
# override this; it overrides LANG and all other LC_ vars
export LC_ALL=C
# Store our initial environment and command line args for later
export DIB_ARGS="$@"
export DIB_ENV=$(export | grep ' DIB_.*=')
SCRIPTNAME=$(basename $0)
if [ -z "$_LIB" ]; then
echo "_LIB not set!"
exit 1
fi
_BASE_ELEMENT_DIR=$(${DIB_PYTHON_EXEC:-python} -c '
import diskimage_builder.paths
diskimage_builder.paths.show_path("elements")')
source $_LIB/die
IS_RAMDISK=0
if [ "$SCRIPTNAME" == "ramdisk-image-create" ]; then
IS_RAMDISK=1
fi
function show_options () {
echo "Usage: ${SCRIPTNAME} [OPTION]... [ELEMENT]..."
echo
echo "Options:"
echo " -a i386|amd64|armhf|arm64 -- set the architecture of the image(default amd64)"
echo " -o imagename -- set the imagename of the output image file(default image)"
echo " -t qcow2,tar,tgz,squashfs,vhd,docker,aci,raw -- set the image types of the output image files (default qcow2)"
echo " File types should be comma separated. VHD outputting requires the vhd-util"
echo " executable be in your PATH. ACI outputting requires the ACI_MANIFEST "
echo " environment variable be a path to a manifest file."
echo " -x -- turn on tracing (use -x -x for very detailed tracing)."
echo " -u -- uncompressed; do not compress the image - larger but faster"
echo " -c -- clear environment before starting work"
echo " --logfile -- save run output to given logfile"
echo " --checksum -- generate MD5 and SHA256 checksum files for the created image"
echo " --image-size size -- image size in GB for the created image"
echo " --image-cache directory -- location for cached images(default ~/.cache/image-create)"
echo " --max-online-resize size -- max number of filesystem blocks to support when resizing."
echo " Useful if you want a really large root partition when the image is deployed."
echo " Using a very large value may run into a known bug in resize2fs."
echo " Setting the value to 274877906944 will get you a 1PB root file system."
echo " Making this value unnecessarily large will consume extra disk space "
echo " on the root partition with extra file system inodes."
echo " --min-tmpfs size -- minimum size in GB needed in tmpfs to build the image"
echo " --mkfs-options -- option flags to be passed directly to mkfs."
echo " Options should be passed as a single string value."
echo " --no-tmpfs -- do not use tmpfs to speed image build"
echo " --offline -- do not update cached resources"
echo " --qemu-img-options -- option flags to be passed directly to qemu-img."
echo " Options need to be comma separated, and follow the key=value pattern."
echo " --root-label label -- label for the root filesystem. Defaults to 'cloudimg-rootfs'."
echo " --ramdisk-element -- specify the main element to be used for building ramdisks."
echo " Defaults to 'ramdisk'. Should be set to 'dracut-ramdisk' for platforms such"
echo " as RHEL and CentOS that do not package busybox."
echo " --install-type -- specify the default installation type. Defaults to 'source'. Set to 'package' to use package based installations by default."
echo " --docker-target -- specify the repo and tag to use if the output type is docker. Defaults to the value of output imagename"
if [ "$IS_RAMDISK" == "0" ]; then
echo " -n skip the default inclusion of the 'base' element"
echo " -p package[,p2...] [-p p3] -- extra packages to install in the image. Runs once, after 'install.d' phase. Can be specified mulitple times"
fi
echo " -h|--help -- display this help and exit"
echo " --version -- display version and exit"
echo
echo "Environment Variables:"
echo " (this is not a complete list)"
echo
echo " * ELEMENTS_PATH: specify external locations for the elements. As for \$PATH"
echo " * DIB_NO_TIMESTAMP: no timestamp prefix on output. Useful if capturing output"
echo " * DIB_QUIET: do not output log output to stdout. See --logfile"
echo
echo "NOTE: At least one distribution root element must be specified."
echo
echo "NOTE: If using the VHD output format you need to have a patched version of vhd-util installed for the image"
echo " to be bootable. The patch is available here: https://github.com/emonty/vhd-util/blob/master/debian/patches/citrix"
echo " and a PPA with the patched tool is available here: https://launchpad.net/~openstack-ci-core/+archive/ubuntu/vhd-util"
echo
echo "Examples:"
if [ "$IS_RAMDISK" == "0" ]; then
echo " ${SCRIPTNAME} -a amd64 -o ubuntu-amd64 vm ubuntu"
echo " export ELEMENTS_PATH=~/source/tripleo-image-elements/elements"
echo " ${SCRIPTNAME} -a amd64 -o fedora-amd64-heat-cfntools vm fedora heat-cfntools"
else
echo " ${SCRIPTNAME} -a amd64 -o fedora-deploy deploy fedora"
echo " ${SCRIPTNAME} -a amd64 -o ubuntu-ramdisk ramdisk ubuntu"
fi
}
function show_version() {
${DIB_PYTHON_EXEC:-python} -c "from diskimage_builder import version; print(version.version_info.version_string())"
}
DIB_DEBUG_TRACE=${DIB_DEBUG_TRACE:-0}
INSTALL_PACKAGES=""
IMAGE_TYPES=("qcow2")
COMPRESS_IMAGE="true"
ROOT_LABEL=""
DIB_DEFAULT_INSTALLTYPE=${DIB_DEFAULT_INSTALLTYPE:-"source"}
MKFS_OPTS=""
ACI_MANIFEST=${ACI_MANIFEST:-}
DOCKER_TARGET=""
LOGFILE=""
TEMP=`getopt -o a:ho:t:xucnp: -l checksum,no-tmpfs,offline,help,version,min-tmpfs:,image-size:,image-cache:,max-online-resize:,mkfs-options:,qemu-img-options:,ramdisk-element:,root-label:,install-type:,docker-target:,logfile: -n $SCRIPTNAME -- "$@"`
if [ $? -ne 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"
while true ; do
case "$1" in
-a) export ARCH=$2; shift 2 ;;
-o) export IMAGE_NAME=$2; shift 2 ;;
-t) IFS="," read -a IMAGE_TYPES <<< "$2"; export IMAGE_TYPES ; shift 2 ;;
-h|--help) show_options; exit 0;;
--version) show_version; exit 0;;
-x) shift; DIB_DEBUG_TRACE=$(( $DIB_DEBUG_TRACE + 1 ));;
-u) shift; export COMPRESS_IMAGE="";;
-c) shift ; export CLEAR_ENV=1;;
-n) shift; export SKIP_BASE="1";;
-p) IFS="," read -a _INSTALL_PACKAGES <<< "$2"; export INSTALL_PACKAGES=( ${INSTALL_PACKAGES[@]} ${_INSTALL_PACKAGES[@]} ) ; shift 2 ;;
--checksum) shift; export DIB_CHECKSUM=1;;
--image-size) export DIB_IMAGE_SIZE=$2; shift 2;;
--image-cache) export DIB_IMAGE_CACHE=$2; shift 2;;
--max-online-resize) export MAX_ONLINE_RESIZE=$2; shift 2;;
--mkfs-options) MKFS_OPTS=$2; shift 2;;
--min-tmpfs) export DIB_MIN_TMPFS=$2; shift 2;;
--no-tmpfs) shift; export DIB_NO_TMPFS=1;;
--offline) shift; export DIB_OFFLINE=1;;
--qemu-img-options) QEMU_IMG_OPTIONS=$2; shift 2;;
--root-label) ROOT_LABEL=$2; shift 2;;
--ramdisk-element) RAMDISK_ELEMENT=$2; shift 2;;
--install-type) DIB_DEFAULT_INSTALLTYPE=$2; shift 2;;
--docker-target) export DOCKER_TARGET=$2; shift 2 ;;
--logfile) export LOGFILE=$2; shift 2 ;;
--) shift ; break ;;
*) echo "Internal error!" ; exit 1 ;;
esac
done
export DIB_DEBUG_TRACE
# TODO: namespace this under ~/.cache/dib/ for consistency
export DIB_IMAGE_CACHE=${DIB_IMAGE_CACHE:-~/.cache/image-create}
mkdir -p $DIB_IMAGE_CACHE
# We have a couple of critical sections (touching parts of the host
# system or download images to common cache) that we use flock around.
# Use this directory for lockfiles.
export DIB_LOCKFILES=${DIB_LOCKFILES:-~/.cache/dib/lockfiles}
mkdir -p $DIB_LOCKFILES
if [ "$CLEAR_ENV" = "1" -a "$HOME" != "" ]; then
echo "Re-execing to clear environment."
echo "(note this will prevent much of the local_config element from working)"
exec -c $0 "$@"
fi
# We send stdout & stderr through "outfilter" which does timestamping,
# basic filtering and log file output.
_TS_FLAG=""
if [[ "${DIB_NO_TIMESTAMP:-0}" -eq 1 ]]; then
_TS_FLAG="--no-timestamp"
fi
_QUIET_FLAG="-v"
if [[ "${DIB_QUIET:-0}" -eq 1 ]]; then
_QUIET_FLAG=""
fi
_LOGFILE_FLAG=""
if [[ -n "${LOGFILE}" ]]; then
echo "Output logs going to: ${LOGFILE}"
_LOGFILE_FLAG="-o ${LOGFILE}"
fi
# Save the existing stdout to fd3
exec 3>&1
exec 1> >( ${DIB_PYTHON_EXEC:-python} $_LIB/outfilter.py ${_TS_FLAG} ${_QUIET_FLAG} ${_LOGFILE_FLAG} ) 2>&1
# Display the current file/function/line in the debug output
function _ps4 {
IFS=" " called=($(caller 0))
local f=$(readlink -f ${called[2]})
# As we're being run out of the python package's lib/ dir (either
# virtualenv or system), we can strip everything before
# "site-packages" to significantly shorten the line without really
f=${f##*site-packages/}
printf "%-80s " "$f:${called[1]}:${called[0]}"
}
export -f _ps4
export PS4='+ $(_ps4): '
source $_LIB/img-defaults
source $_LIB/common-functions
source $_LIB/img-functions
if [ "$IS_RAMDISK" == "1" ]; then
source $_LIB/ramdisk-defaults
source $_LIB/ramdisk-functions
fi
echo "diskimage-builder version $(show_version)"
# If no elements are specified theres no way we can succeed
if [ -z "$*" ]; then
echo "ERROR: At least one distribution root element must be specified"
exit 1
fi
arg_to_elements "$@"
# start tracing after most boilerplate
if [ ${DIB_DEBUG_TRACE} -gt 0 ]; then
set -x
fi
if [ "${#IMAGE_TYPES[@]}" = "1" ]; then
export IMAGE_NAME=${IMAGE_NAME%%\.${IMAGE_TYPES[0]}}
fi
# Check for required tools early on
for X in ${!IMAGE_TYPES[@]}; do
case "${IMAGE_TYPES[$X]}" in
qcow2)
if ! type qemu-img > /dev/null 2>&1; then
echo "qcow2 output format specified but qemu-img executable not found."
exit 1
fi
;;
tgz)
# Force tar to be created.
IMAGE_TYPES+=('tar')
;;
vhd)
if ! type vhd-util > /dev/null 2>&1; then
echo "vhd output format specified but no vhd-util executable found."
exit 1
fi
;;
squashfs)
if ! type mksquashfs > /dev/null 2>&1; then
echo "squashfs output format specified but no mksquashfs executable found."
exit 1
fi
;;
docker)
if ! type docker > /dev/null 2>&1; then
echo "docker output format specified but no docker executable found."
exit 1
fi
if [ -z "$DOCKER_TARGET" ]; then
echo "Please set --docker-target."
exit 1
fi
;;
esac
done
# NOTE: fstrim is on most all recent systems. It is provided by the util-linux
# package.
if ! type fstrim > /dev/null 2>&1; then
echo "fstrim utility is not found. This is provided by util-linux package"
echo "Please check your PATH variable is set correctly"
exit 1
fi
# xattr support cannot be relied upon with tmpfs builds
# some kernels supoprt it, some don't
if [[ -n "${GENTOO_PROFILE}" ]]; then
if [[ "${GENTOO_PROFILE}" =~ "hardened" ]]; then
echo 'disabling tmpfs for gentoo hardened build'
export DIB_NO_TMPFS=1
fi
fi
mk_build_dir
# Create the YAML file with the final and raw configuration for
# the block device layer.
mkdir -p ${TMP_BUILD_DIR}/block-device
BLOCK_DEVICE_CONFIG_YAML=${TMP_BUILD_DIR}/block-device/config.yaml
block_device_create_config_file "${BLOCK_DEVICE_CONFIG_YAML}"
# Write out the parameter file
DIB_BLOCK_DEVICE_PARAMS_YAML=${TMP_BUILD_DIR}/block-device/params.yaml
export DIB_BLOCK_DEVICE_PARAMS_YAML
cat >${DIB_BLOCK_DEVICE_PARAMS_YAML} <<EOF
config: ${BLOCK_DEVICE_CONFIG_YAML}
image-dir: ${TMP_IMAGE_DIR}
root-fs-type: ${FS_TYPE}
root-label: ${ROOT_LABEL}
mount-base: ${TMP_BUILD_DIR}/mnt
build-dir: ${TMP_BUILD_DIR}
EOF
dib-block-device init
# Need to get the real root label because it can be overwritten
# by the BLOCK_DEVICE_CONFIG.
DIB_ROOT_LABEL=$(dib-block-device getval root-label)
export DIB_ROOT_LABEL
# Need to get the real fs type for the root filesystem
DIB_ROOT_FSTYPE=$(dib-block-device getval root-fstype)
export DIB_ROOT_FSTYPE
# retrieve mount points so we can reuse in elements
DIB_MOUNTPOINTS=$(dib-block-device getval mount-points)
export DIB_MOUNTPOINTS
create_base
# This variable needs to be propagated into the chroot
mkdir -p $TMP_HOOKS_PATH/environment.d
echo "export DIB_DEFAULT_INSTALLTYPE=\${DIB_DEFAULT_INSTALLTYPE:-\"${DIB_DEFAULT_INSTALLTYPE}\"}" > $TMP_HOOKS_PATH/environment.d/11-dib-install-type.bash
run_d extra-data
# Run pre-install scripts. These do things that prepare the chroot for package installs
run_d_in_target pre-install
# Call install scripts to pull in the software users want.
run_d_in_target install
do_extra_package_install
run_d_in_target post-install
run_d post-root
# ensure we do not have a lost+found directory in the root folder
# that could cause copy to fail (it will be created again later
# when creating the file system, if it needs such directory)
if [ -e "$TMP_BUILD_DIR/mnt/lost+found" ]; then
sudo rm -rf "$TMP_BUILD_DIR/mnt/lost+found"
fi
# Free up /mnt
unmount_image
mv $TMP_BUILD_DIR/mnt $TMP_BUILD_DIR/built
# save xtrace state, as we always want to turn it off to avoid
# spamming the logs with du output below.
xtrace=$(set +o | grep xtrace)
# temp file for holding du output
du_output=${TMP_BUILD_DIR}/du_output.tmp
if [ -n "$DIB_IMAGE_SIZE" ]; then
du_size=$(echo "$DIB_IMAGE_SIZE" | awk '{printf("%d\n",$1 * 1024 *1024)}')
else
set +o xtrace
echo "Calculating image size (this may take a minute)..."
sudo du -a -c -x ${TMP_BUILD_DIR}/built > ${du_output}
# the last line is the total size from "-c".
# scale this by 0.6 to create a slightly bigger image
du_size=$(tail -n1 ${du_output} | cut -f1 | awk '{print int($1 / 0.6)}')
$xtrace
fi
if [[ "${DIB_SHOW_IMAGE_USAGE:-0}" != 0 ]]; then
set +o xtrace
if [ ! -f "$du_output" ]; then
sudo du -a -c -x ${TMP_BUILD_DIR}/built > ${du_output}
fi
du_output_show="sort -nr ${du_output} |
numfmt --to=iec-i --padding=7
--suffix=B --field=1 --from-unit=1024"
# by default show the 10MiB and greater files & directories -- a
# dir with lots of little files will still show up, but this helps
# signal:noise ratio
if [[ ${DIB_SHOW_IMAGE_USAGE_FULL:-0} == 0 ]]; then
# numfmt will start giving a decimal place when < 10MiB
du_output_show+="| egrep 'MiB|GiB|TiB|PiB' | grep -v '\..MiB'"
echo "================================="
echo "Image size report (files > 10MiB)"
echo "================================="
else
echo "================="
echo "Image size report"
echo "================="
fi
eval ${du_output_show}
echo
echo "===== end image size report ====="
echo
$xtrace
fi
rm -f ${du_output}
if [ "$DIB_ROOT_FSTYPE" = "ext4" ] ; then
# Very conservative to handle images being resized a lot
# We set journal size to 64M so our journal is large enough when we
# perform an FS resize.
MKFS_OPTS="-i 4096 -J size=64 $MKFS_OPTS"
# Grow the image size to account for the journal, only if the user
# has not asked for a specific size.
if [ -z "$DIB_IMAGE_SIZE" ]; then
du_size=$(( $du_size + 65536 ))
fi
fi
# Rounding down size so that is is a multiple of 64, works around a bug in
# qemu-img that may occur when compressing raw images that aren't a multiple
# of 64k. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1180021
export DIB_IMAGE_SIZE=$(echo "$du_size" | awk ' { if ($1 % 64 != 0) print $1 + 64 - ( $1 % 64); else print $1; } ')
if [ -n "$MAX_ONLINE_RESIZE" ]; then
MKFS_OPTS="-E resize=$MAX_ONLINE_RESIZE $MKFS_OPTS"
fi
export TMP_IMAGE_DIR
# Try the 'old fashioned' way calling the block device
# phase. If this gives no result, use the configuration based approach:
eval_run_d block-device "IMAGE_BLOCK_DEVICE="
if [ -z ${IMAGE_BLOCK_DEVICE} ] ; then
# For compatibily reasons in addition to the YAML configuration
# there is the need to handle the old environment variables.
echo "image-size: ${DIB_IMAGE_SIZE}KiB" >> ${DIB_BLOCK_DEVICE_PARAMS_YAML}
if [ -n "${MKFS_OPTS}" ] ; then
echo "root-fs-opts: '${MKFS_OPTS}'" >> ${DIB_BLOCK_DEVICE_PARAMS_YAML}
fi
# After changeing the parameters, there is the need to
# re-run dib-block-device init because some value might
# change based on the new set parameters.
dib-block-device init
# values to dib-block-device: using the YAML config and
dib-block-device create
# This is the device (/dev/loopX). It's where to install the
# bootloader.
IMAGE_BLOCK_DEVICE=$(dib-block-device getval image-block-device)
export IMAGE_BLOCK_DEVICE
# Similar to above, but all mounted devices. This is handy for
# some bootloaders that have multi-partition layouts and want to
# copy things to different places other than just
# IMAGE_BLOCK_DEVICE. "eval" this into an array as needed
IMAGE_BLOCK_DEVICES=$(dib-block-device getval image-block-devices)
export IMAGE_BLOCK_DEVICES
# Write the fstab
dib-block-device writefstab
fi
# XXX: needed?
LOOPDEV=${IMAGE_BLOCK_DEVICE}
# At this point, dib-block-device has created the raw image file
# (IMAGE_BLOCK_DEVICE) and mounted all the partitions under
# $TMP_BUILD_DIR/mnt for us. We can now copy into the final image.
# 'mv' is not usable here - especially when a top level directory
# has the same name as a mount point of a partition. If so, 'mv'
# will complain:
# mv: inter-device move failed: '...' to '...'; \
# unable to remove target: Device or resource busy
# therefore a 'cp' and 'rm' approach is used.
sudo cp -ra ${TMP_BUILD_DIR}/built/* $TMP_BUILD_DIR/mnt
sudo rm -fr ${TMP_BUILD_DIR}/built/*
mount_proc_dev_sys
run_d pre-finalise
run_d_in_target finalise
finalise_base
for X in ${!IMAGE_TYPES[@]} ; do
if [[ " tar aci " =~ "${IMAGE_TYPES[$X]}" ]]; then
if [ "${IMAGE_TYPES[$X]}" = "aci" ]; then
sudo tar -C ${TMP_BUILD_DIR}/mnt -cf $IMAGE_NAME.aci --exclude ./sys \
--exclude ./proc --xattrs --xattrs-include=\* \
--transform 's,^.,rootfs,S' .
if [ -n "$ACI_MANIFEST" ]; then
cp $ACI_MANIFEST ${TMP_BUILD_DIR}/manifest
sudo tar -C ${TMP_BUILD_DIR} --append -f $IMAGE_NAME.aci manifest
else
echo "No ACI_MANIFEST specified. An ACI_MANIFEST must be specified for"
echo " this image to be usable."
fi
else
sudo tar -C ${TMP_BUILD_DIR}/mnt -cf $IMAGE_NAME.tar --exclude ./sys \
--exclude ./proc --xattrs --xattrs-include=\* .
fi
sudo chown $USER: $IMAGE_NAME.${IMAGE_TYPES[$X]}
unset IMAGE_TYPES[$X]
elif [ "${IMAGE_TYPES[$x]}" == "squashfs" ]; then
sudo mksquashfs ${TMP_BUILD_DIR}/mnt $IMAGE_NAME.squash -comp xz \
-noappend -root-becomes ${TMP_BUILD_DIR}/mnt \
-wildcards -e "proc/*" -e "sys/*" -no-recovery
elif [ "${IMAGE_TYPES[$X]}" == "docker" ]; then
sudo tar -C ${TMP_BUILD_DIR}/mnt -cf - --exclude ./sys \
--exclude ./proc --xattrs --xattrs-include=\* . \
| sudo docker import - $DOCKER_TARGET
unset IMAGE_TYPES[$X]
fi
done
# Unmount and cleanup the /mnt and /build subdirectories, to save
# space before converting the image to some other format.
# XXX ? needed?
export EXTRA_UNMOUNT=""
unmount_image
TMP_IMAGE_PATH=$(dib-block-device getval image-path)
export TMP_IMAGE_PATH
# remove all mounts
dib-block-device umount
dib-block-device cleanup
cleanup_build_dir
if [[ (! $IMAGE_ELEMENT =~ no-final-image) && "$IS_RAMDISK" == "0" ]]; then
has_raw_type=
for IMAGE_TYPE in ${IMAGE_TYPES[@]} ; do
# We have to do raw last because it is destructive
if [ "$IMAGE_TYPE" = "raw" ]; then
has_raw_type=1
elif [ "$IMAGE_TYPE" != "squashfs" ]; then
compress_and_save_image $IMAGE_NAME.$IMAGE_TYPE
fi
done
if [ -n "$has_raw_type" ]; then
IMAGE_TYPE="raw"
compress_and_save_image $IMAGE_NAME.$IMAGE_TYPE
fi
fi
# Remove the leftovers, i.e. the temporary image directory.
cleanup_image_dir
# Restore fd 1&2 from the outfilter.py redirect back to the original
# saved fd. Note small hack that we can't really wait properly for
# outfilter.py so put in a sleep (might be possible to use coproc for
# this...?)
#
# TODO(ianw): probably better to cleanup the exit handler a bit for
# this? We really want some helper functions that append to the exit
# handler so we can register multiple things.
set +o xtrace
echo "Build completed successfully"
exec 1>&3 2>&3
sleep 1
# All done!
trap EXIT