Comment 6 for bug 1636531

Verified yakkety and zesty:
$ for release in yakkety zesty; do ref=$release-proposed; lxc init $ref $name; lxc start $name; sleep 10; lxc exec $name -- git clone -b ubuntu/xenial https://git.launchpad.net/cloud-init; lxc exec $name -- apt install python2.7 tox -y; lxc exec $name -- mv /sbin/blkid /sbin/blkid.orig; lxc file push fake-blkid.sh $name/sbin/blkid; lxc exec $name bash; lxc exec $name -- dpkg -l cloud-init; lxc exec $name -- grep VERSION= /etc/os-release; lxc stop $name; lxc delete $name; done

reating proposed-test
Cloning into 'cloud-init'...
remote: Counting objects: 25632, done.
remote: Compressing objects: 100% (10479/10479), done.
remote: Total 25632 (delta 18547), reused 21070 (delta 14881)
Receiving objects: 100% (25632/25632), 16.85 MiB | 2.43 MiB/s, done.
Resolving deltas: 100% (18547/18547), done.
Checking connectivity... done.
Get:1 http://archive.ubuntu.com/ubuntu yakkety/main amd64 libpython2.7-minimal amd64 2.7.12-3build1 [340 kB]
...
Setting up python2.7 (2.7.12-3build1) ...
root@proposed-test:~# cd cloud-init/
root@proposed-test:~/cloud-init# tox -e py27 tests/unittests/test_datasource/test_altcloud.py | grep 'LEAKED BLKID'
## no LEAKED calls reported. Checking that blkid was properly hijacked
root@proposed-test:~/cloud-init# /sbin/blkid
LEAKED BLKID CALL
root@proposed-test:~/cloud-init# exit
exit
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii cloud-init 0.7.9-113-g5 all Init scripts for cloud instances
VERSION="16.10 (Yakkety Yak)"
Creating proposed-test
Creating proposed-test
Cloning into 'cloud-init'...
remote: Counting objects: 25632, done.
remote: Compressing objects: 100% (10479/10479), done.
remote: Total 25632 (delta 18543), reused 21074 (delta 14881)
Receiving objects: 100% (25632/25632), 16.85 MiB | 7.67 MiB/s, done.
Resolving deltas: 100% (18543/18543), done.
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  javascript-common libjs-jquery libjs-sphinxdoc libjs-underscore
... Setting up python2.7 (2.7.13-2) ...
tox -e py27 tests/unittests/test_datasource/test_altcloud.py | grep 'LEAKED BLKID'
## no LEAKED calls reported. Checking that blkid was properly hijacked
root@proposed-test:~/cloud-init# /sbin/blkid
LEAKED BLKID CALL
root@proposed-test:~/cloud-init# exit
exit
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii cloud-init 0.7.9-113-g5 all Init scripts for cloud instances
VERSION="17.04 (Zesty Zapus)"