cloud-init

userless conf fails assign user[0] as the default user

Bug #1041384 reported by Ben Howard
4
This bug affects 1 person
Affects Status Importance Assigned to Milestone
cloud-init
Fix Released
High
Unassigned

Bug Description

The userles merge fails to properly assign user[0] as the default user due to default configuration and the way that cloud-init merges the ondisk configuration with the cloud-config sent by the user.

cloud-init/config/cloud.cfg (Default configuration)
  4 # Implement for Ubuntu only: create the default 'ubuntu' user
  5 users:
  6 default: true
  7

If a user launches with the cloud config of:
users:
    foo: True

The expected behavior is that user foo would be configured equivalent to the parameter "user: foo".

However, due to this code and the default configuration:
cloud-init/cloudinit/stages.py
164
165.....def _read_cfg(self, extra_fns):
166.........no_cfg_paths = helpers.Paths({}, self.datasource)
167.........merger = helpers.ConfigMerger(paths=no_cfg_paths,
168.......................................datasource=self.datasource,
169.......................................additional_fns=extra_fns,
170.......................................base_cfg=self._read_base_cfg())
171........return merger.cfg

cloud-init generates the user lists as:
users:
    default: True
    foo: True

So what is happening is the default configuratoin is merged with the cloud-config.

Effectively this means that regardless of the user configuration send in the cloud-config:
  - The ubuntu user will always be created on a Ubuntu systems
  - The ubuntu user is always user[0]
  - Any configured user is user[n+1], and therefore will not be uzer[0]
  - A cloud-config of "user: default: false" will be ignored.

IMHO, this is a pretty serious bug.

See original description

Related branches

lp:~cloud-init-dev/cloud-init/trunk
Chad Smith (community): Needs Fixing
Hannes: Pending requested
Diff: 51583 lines (+11/-49380) (has conflicts)
424 files modified
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tools/read-version (+0/-26)
tools/run-pep8 (+0/-22)
tools/run-pyflakes (+0/-18)
tools/run-pyflakes3 (+0/-2)
tools/tox-venv (+0/-42)
tools/uncloud-init (+0/-141)
tools/validate-yaml.py (+0/-25)
tools/write-ssh-key-fingerprints (+0/-38)
tox.ini (+0/-35)
udev/66-azure-ephemeral.rules (+0/-18)
udev/79-cloud-init-net-wait.rules (+0/-10)
udev/cloud-init-wait (+0/-70)
upstart/cloud-config.conf (+0/-9)
upstart/cloud-final.conf (+0/-10)
upstart/cloud-init-blocknet.conf (+0/-83)
upstart/cloud-init-container.conf (+0/-57)
upstart/cloud-init-local.conf (+0/-16)
upstart/cloud-init-nonet.conf (+0/-66)
upstart/cloud-init.conf (+0/-9)
upstart/cloud-log-shutdown.conf (+0/-19)
JJ Asghar: Pending requested
Diff: 0 lines
Scott Moser: Pending requested
Diff: 3061 lines (+2239/-175)
39 files modified
ChangeLog (+39/-9)
cloud-init.py (+31/-1)
cloudinit/CloudConfig/__init__.py (+1/-1)
cloudinit/CloudConfig/cc_apt_pipelining.py (+53/-0)
cloudinit/CloudConfig/cc_ca_certs.py (+3/-1)
cloudinit/CloudConfig/cc_chef.py (+5/-5)
cloudinit/CloudConfig/cc_landscape.py (+5/-0)
cloudinit/CloudConfig/cc_resizefs.py (+31/-12)
cloudinit/CloudConfig/cc_salt_minion.py (+2/-1)
cloudinit/CloudConfig/cc_update_etc_hosts.py (+1/-1)
cloudinit/DataSource.py (+4/-1)
cloudinit/DataSourceCloudStack.py (+92/-0)
cloudinit/DataSourceConfigDrive.py (+231/-0)
cloudinit/DataSourceEc2.py (+2/-84)
cloudinit/DataSourceMAAS.py (+345/-0)
cloudinit/DataSourceNoCloud.py (+75/-2)
cloudinit/DataSourceOVF.py (+1/-1)
cloudinit/SshUtil.py (+2/-0)
cloudinit/UserDataHandler.py (+2/-2)
cloudinit/__init__.py (+44/-9)
cloudinit/netinfo.py (+5/-5)
cloudinit/util.py (+253/-30)
config/cloud.cfg (+3/-1)
debian.trunk/control (+1/-0)
doc/configdrive/README (+118/-0)
doc/examples/cloud-config-chef-oneiric.txt (+90/-0)
doc/examples/cloud-config-chef.txt (+48/-6)
doc/examples/cloud-config-datasources.txt (+18/-0)
doc/examples/cloud-config.txt (+11/-0)
doc/kernel-cmdline.txt (+48/-0)
doc/nocloud/README (+55/-0)
setup.py (+1/-0)
tests/unittests/test__init__.py (+242/-0)
tests/unittests/test_datasource/test_maas.py (+153/-0)
tests/unittests/test_handler/test_handler_ca_certs.py (+4/-0)
tests/unittests/test_userdata.py (+107/-0)
tests/unittests/test_util.py (+18/-2)
tools/Z99-cloud-locale-test.sh (+92/-0)
tools/run-pylint (+3/-1)
lp:ubuntu/quantal/cloud-init
Ben Howard (darkmuggle-deactivatedaccount)
Changed in cloud-init:
status: New → Confirmed
summary: - userless configuration fails due to default configuration
+ userless conf fails assign user[0] as the default user
description: updated
Ben Howard (darkmuggle-deactivatedaccount)
description: updated
description: updated
Revision history for this message
Ben Howard (darkmuggle-deactivatedaccount) wrote :

Filed MP: #121295 as a potential fix.

Revision history for this message
Ben Howard (darkmuggle-deactivatedaccount) wrote :

Note, this bug appears to affect other cloud-config options that have a default option set.

Revision history for this message
Scott Moser (smoser) wrote :

What you're running into is really just a generic limitation of the merge routine that cloud-init uses. We had hoped to improve the function of this merge routine at Bug 1023179, but have not implemented this yet.

I don't think its really safe or desirable to change this at the moment.

A more reasonable change I think is to change the users and groups to be lists of dicts rather than a dict of dicts.
dicts get added to or updated, but lists get replaced. So, if your default config entry is a list rather than a dict, then the user's value will entirely replace the list.

Ie:
groups:
  - ubuntu: [foo,bar]
  - cloud-users
users:
 - name: ubuntu

you could also allow for the case where an entry in the ''users" list is a string:
users:
 - default

basically, then the presense of the 'default' user in the users list would trigger creation of the "default" user.

Scott Moser (smoser)
Changed in cloud-init:
importance: Undecided → High
assignee: nobody → Ben Howard (utlemming)
Revision history for this message
Ben Howard (darkmuggle-deactivatedaccount) wrote :

This was fixed in r641. Marking as fixed released.

Changed in cloud-init:
status: Confirmed → Fix Released
Revision history for this message
James Falcon (falcojr) wrote :

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/2286

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