3 ##############################################################################
4 # Copyright (c) 2015 Ericsson AB and others.
6 # All rights reserved. This program and the accompanying materials
7 # are made available under the terms of the Apache License, Version 2.0
8 # which accompanies this distribution, and is available at
9 # http://www.apache.org/licenses/LICENSE-2.0
10 ##############################################################################
12 # yardstick-img-modify - download and modify a Ubuntu cloud image
14 # The actual customization is done by a script passed with an absolute path as
15 # the only single argument. The command needs to be invoked as sudo
18 # yardstick-img-modify /home/yardstick/tools/ubuntu-server-cloudimg-modify.sh
20 # Warning: the script will create files by default in:
21 # /tmp/workspace/yardstick
22 # the files will be owned by root!
24 # TODO: image resize is needed if the base image is too small
34 test $# -eq 1 || die "no image specific script as argument"
35 test $(id -u) -eq 0 || die "should invoke using sudo"
39 mountdir="/mnt/yardstick"
41 workspace=${WORKSPACE:-"/tmp/workspace/yardstick"}
42 host=${HOST:-"cloud-images.ubuntu.com"}
43 release=${RELEASE:-"trusty"}
44 image_path="${release}/current/${release}-server-cloudimg-amd64-disk1.img"
45 image_url=${IMAGE_URL:-"https://${host}/${image_path}"}
46 md5sums_path="${release}/current/MD5SUMS"
47 md5sums_url=${MD5SUMS_URL:-"https://${host}/${md5sums_path}"}
49 imgfile="${workspace}/yardstick-${release}-server.img"
50 filename=$(basename $image_url)
52 # download and checksum base image, conditionally if local copy is outdated
54 test -d $workspace || mkdir -p $workspace
56 rm -f MD5SUMS # always download the checksum file to a detect stale image
58 test -e $filename || wget -nc $image_url
59 grep $filename MD5SUMS | md5sum -c ||
63 grep $filename MD5SUMS | md5sum -c
72 if [ -f /etc/centos-release ]; then
73 # CentOS, mount image using guestmount.
74 # (needs libguestfs-tools installed)
75 export LIBGUESTFS_BACKEND=direct
76 guestmount -a $imgfile -i --rw $mountdir
78 # mount image using qemu-nbd
79 modprobe nbd max_part=16
80 qemu-nbd -c /dev/nbd0 $imgfile
83 mount /dev/nbd0p1 $mountdir
85 cp $cmd $mountdir/$(basename $cmd)
88 # modify image running a script using in a chrooted environment
90 # resolv.conf does not exist in base image, pass nameserver value from host
91 nameserver_ip=$(grep -m 1 '^nameserver' \
92 /etc/resolv.conf | awk '{ print $2 '})
93 chroot $mountdir /$(basename $cmd) $nameserver_ip
96 # cleanup (umount) the image
98 # designed to be idempotent
99 mount | grep $mountdir && umount $mountdir
100 test -b /dev/nbd0 && partprobe /dev/nbd0
101 pgrep qemu-nbd && qemu-nbd -d /dev/nbd0
103 killall qemu-nbd 2> /dev/null || true
104 lsmod | grep nbd && rmmod nbd || true
114 echo "the modified image is found here: $imgfile"