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| author | Julian Andres Klode <julian.klode@canonical.com> | 2025-04-04 15:25:01 +0200 |
|---|---|---|
| committer | Julian Andres Klode <julian.klode@canonical.com> | 2025-04-04 15:28:40 +0200 |
| commit | 295ab44a3063fb7790d8a558a161fc1bd801f998 (patch) | |
| tree | 61a0d5a9aa559f6acb18712c040ee473c36c9fa3 /doc | |
| parent | b279e8b3df2c8620bb3a0f2deb8325a85f4a9a3b (diff) | |
solver3: Consider more upgrades more costly when not upgrading
We inadvertently considered more upgrades as a better solution in
all cases, but if we are *installing* rather than upgrading, we
should count upgrades as a negative.
Change the code to accomodate that. This requires a few more
tricks:
- We remove the keep count check. This does not appear to work
correctly and would have prevented the fix. We are already
counting all possible changes, so why bother.
- We need to subtract the upgrade count from the install count
(upgrades are a class of installs) since we now allow comparing
solutions with different upgrade counts for install counts.
- After comparing the "new install count", we now compare upgrade
count too, in the opposite direction of upgrading.
To test, we abuse that solver 3.0 does not upgrade all packages
in a source package when using the install command.
LP: #2105395
Diffstat (limited to 'doc')
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