This bug was fixed in the package ubuntu-advantage-tools - 27.14.4~16.04
---------------
ubuntu-advantage-tools (27.14.4~16.04) xenial; urgency=medium
* Backport new upstream release: (LP: #2011477) to xenial
ubuntu-advantage-tools (27.14.4) lunar; urgency=medium
* timer: disable update_contract_info job (LP: #2015302)
* livepatch: prevent livepatch from auto-enabling and subsequently failing
on non-amd64 systems (LP: #2015241)
ubuntu-advantage-tools (27.14.3) lunar; urgency=medium
* livepatch: prevent livepatch from auto-enabling and subsequently failing
on interim releases (LP: #2013409)
ubuntu-advantage-tools (27.14.2~23.04.1) lunar; urgency=medium
* status:
- always use dpkg instead of lscpu for fetching architecture
information (LP: #2012735)
ubuntu-advantage-tools (27.14.1~23.04.1) lunar; urgency=medium
* New upstream release 27.14.1
- apt: fix a configuration leak in the apt.get_pkg_candidate_version
function (LP: #2012642)
ubuntu-advantage-tools (27.14~23.04.1) lunar; urgency=medium
* d/ubuntu-advantage-tools.{postinst,postrm,preinst}:
- migrate certain settings out of uaclient.conf to a new file managed by
the pro config subcommand (LP: #2004280)
* d/ubuntu-advantage-tools.postinst:
- refactor PREVIOUS_PKG_VER as a global variable
- simplify how we add notices
* New upstream release 27.14 (LP: #2011477)
- api: new u.unattended_upgrades.status.v1 endpoint for querying status of
unattended upgrades
- apt:
+ remove legacy apt-hook
+ deliver json apt-hook for interim releases
+ fix cloud identification logic in json apt-hook
+ make all calls to esm-cache isolated from system configuration
(LP: #2008280)
+ only set up the esm cache on supported systems (LP: #2004018)
- fix:
+ format the output to be more readable (LP: #1926182)
+ add option to attach during a fix without a token
+ verify if fixed version can be installed before trying (LP: #2006705)
- livepatch: show warning if current kernel is not supported
- locks: alert user about corrupted lock files (LP: #1996931)
- logging: logs are now formatted as jsonlines
- motd: remove esm-apps announcement
- notices: new representation on disk as separate files (LP: #1987738)
- realtime: remove ubuntu-realtime package on disablement
- status:
+ removed contract info update check network call
+ no longer includes warnings about notices when non-root (LP: #2006138)
+ unattached status sends virt type to contract server for better
resource availability calculation
- timer jobs: add daily job to check for contract updates
- yaml: always import distro-provided pyyaml (LP: #2007234, LP: #2007241)
-- Renan Rodrigo <[email protected]> Thu, 06 Apr 2023
10:50:05 -0300
** Changed in: ubuntu-advantage-tools (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2007234
Title:
/usr/lib/ubuntu-
advantage/esm_cache.py:ModuleNotFoundError:/usr/lib/ubuntu-
advantage/esm_cache.py@5:/usr/lib/python3/dist-
packages/uaclient/apt.py@13:/usr/lib/python3/dist-
packages/uaclient/event_logger.py@14
Status in ubuntu-advantage-tools package in Ubuntu:
Fix Released
Status in ubuntu-advantage-tools source package in Xenial:
Fix Released
Status in ubuntu-advantage-tools source package in Bionic:
Fix Released
Status in ubuntu-advantage-tools source package in Focal:
Fix Released
Status in ubuntu-advantage-tools source package in Jammy:
Fix Released
Status in ubuntu-advantage-tools source package in Kinetic:
Fix Released
Bug description:
[Impact]
If python3 was able to import uaclient but unable to import yaml for some
reason, pro client processes would crash.
ubuntu-advantage-tools depends on python3-yaml, so we consider the
case where python3-yaml is not installed or corrupted to be
unsupportable by u-a-t (though it may be indicative of a bug or error
somewhere else).
In the case where python3-yaml is installed properly, but the user's
python environment is set up in such a way that it isn't seen by a
normal `import yaml`, then we can mitigate the issue. We will log an
error and exit when yaml is not found, avoiding a crash and autoamatic
error reports.
[Test Case]
In a container, set up a contrived python environment where it can see
uaclient and apt but not yaml:
```
apt update
apt install python3-venv
python3 -m venv env
source ./env/bin/activate
ln -s /usr/lib/python3/dist-packages/uaclient
./env/lib/python3.10/site-packages/uaclient
ln -s /usr/lib/python3/dist-packages/apt
./env/lib/python3.10/site-packages/apt
ln -s /usr/lib/python3/dist-packages/apt_pkg.cpython-310-x86_64-linux-gnu.so
./env/lib/python3.10/site-packages/apt_pkg.cpython-310-x86_64-linux-gnu.so
python3 /usr/lib/ubuntu-advantage/esm_cache.py
systemctl start esm-cache.service
```
(Note that the python version will be different on different Ubuntu releases)
Before the fix, that last commands will fail because u-a-t cannot import yaml.
After the fix, it will log an error, return 1, and no crash will be present
in /var/crash related to this.
[Regression Potential]
The fix relies on importing yaml functionality from uaclient.yaml - if in any
code we import directly from yaml, it will bypass this fix and fail in the same
scenario as this bug does. We need to pay attention to not import yaml directly
in any other module.
The fix involves re-exporting the yaml functions, if we missed an
export that another piece of code relies on, then that would cause an
unhandled exception.
[Discussion]
Until recently our position had been: non-standard python install ->
unsupported. This fix is deals with the error in a best-effort implementation
to avoid crashes and automatic reports from errors.ubuntu.com, which can block
phasing for no reason.
[Original Description]
The Ubuntu Error Tracker has been receiving reports about a problem regarding
ubuntu-advantage-tools. This problem was most recently seen with package
version 27.13.5~20.04.1, the problem page at
https://errors.ubuntu.com/problem/3861dcce5f1d6eda3eb34e1e201e2e517c6a8c37
contains more details, including versions of packages affected, stacktrace or
traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software
developer, you can request it at http://forms.canonical.com/reports/.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-advantage-tools/+bug/2007234/+subscriptions
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