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#!/bin/bash
##############################################################################
# Copyright 2018 EuropeanSoftwareMarketingLtd.
# ===================================================================
# Licensed under the ApacheLicense, Version2.0 (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
#
# 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
##############################################################################
# vnftest comment: this is a modified copy of
# yardstick/tools/vnftest-img-lxd-modify
# vnftest-img-lxd-modify - download and modify a Ubuntu cloud image
#
# The actual customization is done by a script passed with an absolute path as
# the only single argument. The command needs to be invoked as sudo
#
# Example invocation:
# vnftest-img-lxd-modify /home/vnftest/tools/ubuntu-server-cloudimg-modify.sh
#
# Warning: the script will create files by default in:
# /tmp/workspace/vnftest
# the files will be owned by root!
#
# TODO: image resize is needed if the base image is too small
#
set -e
set -x
die() {
echo "error: $1" >&2
exit 1
}
test $# -eq 1 -o $# -eq 2 || die "no image specific script as argument"
test $(id -u) -eq 0 || die "should invoke using sudo"
cmd=$1
RELEASE=$2
test -x $cmd
mountdir="/mnt/vnftest"
workspace=${WORKSPACE:-"/tmp/workspace/vnftest"}
host=${HOST:-"cloud-images.ubuntu.com"}
release=${RELEASE:-"xenial"}
image_path="${release}/current/${release}-server-cloudimg-amd64-root.tar.gz"
image_url=${IMAGE_URL:-"https://${host}/${image_path}"}
sha256sums_path="${release}/current/SHA256SUMS"
sha256sums_url=${SHA256SUMS_URL:-"https://${host}/${sha256sums_path}"}
imgfile="${workspace}/vnftest-image.tar.gz"
filename=$(basename $image_url)
# download and checksum base image, conditionally if local copy is outdated
download() {
test -d $workspace || mkdir -p $workspace
cd $workspace
rm -f SHA256SUMS # always download the checksum file to a detect stale image
wget $sha256sums_url
test -e $filename || wget -nc --progress=dot:giga $image_url
grep $filename SHA256SUMS | sha256sum -c ||
if [ $? -ne 0 ]; then
rm $filename
wget -nc --progress=dot:giga $image_url
grep $filename SHA256SUMS | sha256sum -c
fi
cd -
}
# extract files
setup() {
mkdir -p $mountdir
cp $cmd $mountdir/$(basename $cmd)
cd $workspace
tar zxvf $filename -C $mountdir
}
# modify image running a script using in a chrooted environment
modify() {
# resolv.conf does not exist in base image, pass nameserver value from host
nameserver_ip=$(grep -m 1 '^nameserver' \
/etc/resolv.conf | awk '{ print $2 '})
# prevent init scripts from running during install
echo $'#!/bin/sh\nexit 101' >$mountdir/usr/sbin/policy-rc.d
chmod a+x $mountdir/usr/sbin/policy-rc.d
chroot $mountdir /$(basename $cmd) $nameserver_ip
rm -rf $mountdir/usr/sbin/policy-rc.d
tar zcvf $(basename $imgfile) $mountdir/
}
# cleanup the image
cleanup() {
rm -rf $mountdir
}
exitcode=""
error_trap()
{
local rc=$?
set +e
if [ -z "$exitcode" ]; then
exitcode=$rc
fi
dmesg -T | tail -50
cleanup
echo "Image build failed with $exitcode"
exit $exitcode
}
main() {
cleanup
trap "error_trap" EXIT SIGTERM
download
setup
modify
trap - EXIT SIGTERM
cleanup
echo "the modified image is found here: $imgfile"
}
main
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