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-${release}-server.img"
50 raw_imgfile="${workspace}/yardstick-${release}-server.raw"
51 filename=$(basename $image_url)
53 # download and checksum base image, conditionally if local copy is outdated
55 test -d $workspace || mkdir -p $workspace
57 rm -f MD5SUMS # always download the checksum file to a detect stale image
59 test -e $filename || wget -nc $image_url
60 grep $filename MD5SUMS | md5sum -c ||
64 grep $filename MD5SUMS | md5sum -c
66 qemu-img convert $filename $raw_imgfile
74 for i in $(seq 0 9); do
75 [ -a /dev/loop$i ] || mknod -m 660 /dev/loop$i b 7 $i
78 loopdevice=$(kpartx -l $raw_imgfile | head -1 | cut -f1 -d ' ')
80 kpartx -a $raw_imgfile
82 mount /dev/mapper/$loopdevice $mountdir
83 mount -t proc none $mountdir/proc
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 '})
94 # prevent init scripts from running during install
95 echo $'#!/bin/sh\nexit 101' >$mountdir/usr/sbin/policy-rc.d
96 chmod a+x $mountdir/usr/sbin/policy-rc.d
98 chroot $mountdir /$(basename $cmd) $nameserver_ip
100 rm -rf $mountdir/usr/sbin/policy-rc.d
102 umount -f $mountdir/proc
105 qemu-img convert -c -o compat=0.10 -O qcow2 $raw_imgfile $imgfile
108 # cleanup (umount) the image
110 # designed to be idempotent
111 mount | grep $mountdir/proc && umount $mountdir/proc
112 mount | grep $mountdir && umount $mountdir
113 if [ -f $raw_imgfile ]; then
114 kpartx -d $raw_imgfile || true
129 echo "the modified image is found here: $imgfile"