blob: ee9a45780248a414e05fd46ca982006c5e4b295d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
#!/bin/bash
##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
# yardstick-img-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:
# yardstick-img-modify /home/yardstick/tools/ubuntu-server-cloudimg-modify.sh
#
# Warning: the script will create files by default in:
# /tmp/workspace/yardstick
# the files will be owned by root!
#
# TODO: image resize is needed if the base image is too small
#
set -e
die() {
echo "error: $1" >&2
exit 1
}
test $# -eq 1 || die "no image specific script as argument"
test $(id -u) -eq 0 || die "should invoke using sudo"
cmd=$1
test -x $cmd
mountdir="/mnt/yardstick"
workspace=${WORKSPACE:-"/tmp/workspace/yardstick"}
host=${HOST:-"cloud-images.ubuntu.com"}
release=${RELEASE:-"trusty"}
image_path="${release}/current/${release}-server-cloudimg-amd64-disk1.img"
image_url=${IMAGE_URL:-"https://${host}/${image_path}"}
md5sums_path="${release}/current/MD5SUMS"
md5sums_url=${MD5SUMS_URL:-"https://${host}/${md5sums_path}"}
imgfile="${workspace}/yardstick-${release}-server.img"
raw_imgfile="${workspace}/yardstick-${release}-server.raw"
filename=$(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# download and checksum base image, conditionally if local copy is outdated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 MD5SUMS # always download the checksum file to a detect stale image
wget $md5sums_url
test -e $filename || wget -nc $image_url
grep $filename MD5SUMS | md5sum -c ||
if [ $? -ne 0 ]; then
rm $filename
wget -nc $image_url
grep $filename MD5SUMS | md5sum -c
fi
qemu-img convert $filename $raw_imgfile
cd -
}
# mount image
setup() {
mkdir -p $mountdir
for i in $(seq 0 9); do
[ -a /dev/loop$i ] || mknod -m 660 /dev/loop$i b 7 $i
done
loopdevice=$(kpartx -l $raw_imgfile | head -1 | cut -f1 -d ' ')
kpartx -a $raw_imgfile
mount /dev/mapper/$loopdevice $mountdir
mount -t proc none $mountdir/proc
cp $cmd $mountdir/$(basename $cmd)
}
# modify image running a script using in a chrooted environment
modify() {
# resolv.conf does not exist in base image, pass nameserver value from host
nameserver_ip=$(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
umount -f $mountdir/proc
umount $mountdir
qemu-img convert -c -o compat=0.10 -O qcow2 $raw_imgfile $imgfile
}
# cleanup (umount) the image
cleanup() {
# designed to be idempotent
mount | grep $mountdir/proc && umount $mountdir/proc
mount | grep $mountdir && umount $mountdir
if [ -f $raw_imgfile ]; then
kpartx -d $raw_imgfile || true
fi
rm -f $raw_imgfile
rm -rf $mountdir
}
set -x
main() {
cleanup
download
setup
modify
cleanup
echo "the modified image is found here: $imgfile"
}
main
|
