Tested with 1.5ubuntu3.18.10.3 on Cosmic:
https://launchpadlibrarian.net/416582074/buildlog_ubuntu-cosmic-amd64.unattended-upgrades_1.5ubuntu3.18.10.3_BUILDING.txt.gz
:
...
OK
Running ./test_rewind.py with python3
DEBUG:root:APT::VersionedKernelPackages is not set
DEBUG:root:adjusting candidate version: test-package=2.0
...
OK
...
** Tags removed: verification-needed verification-needed-bionic
verification-needed-cosmic
** Tags added: verification-done verification-done-bionic
verification-done-cosmic
** Also affects: unattended-upgrades (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: unattended-upgrades (Ubuntu Xenial)
Status: New => In Progress
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1820888
Title:
unattended-upgrades may hold back upgrades due to comparing package
versions by their string representation
Status in unattended-upgrades package in Ubuntu:
Fix Released
Status in unattended-upgrades source package in Xenial:
In Progress
Status in unattended-upgrades source package in Bionic:
Fix Committed
Status in unattended-upgrades source package in Cosmic:
Fix Committed
Bug description:
[Impact]
* Without the fix u-u could not upgrade particular packages from -security.
It could be observed in Cosmic with systemd security updates failing to install
partly due to 239-7ubuntu10.10 being smaller than 239-7ubuntu10.8 when
comparing them as strings:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco/disco/amd64/u/unattended-upgrades/20190318_182031_fe4fe@/log.gz
[Test Case]
* The fix includes the extension of the build-time test cases to
cover package sets with which u-u fails with without the fallback:
...
Running ./test_rewind.py with python3
DEBUG:root:APT::VersionedKernelPackages is not set
DEBUG:root:adjusting candidate version: test-package=2.0
...
With the unfixed version the test case fails here because u-u tries to
upgrade test-package to version 12.0 because it does not find version
2.0 smaller.
[Regression Potential]
* The change is very small and isolated, but fixing it revealed the
issue fixed in LP: #1821101. Since the found issue's fix introduces
fallbacks when apt's resolver can't find a the solution it is unlikely
that other failures are triggered by the fix.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1820888/+subscriptions
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