Hi, I noticed a strange behavior of dnf not updating a package from the package feed, and when I told it to explicitly install that newest package version it went "Downgrading: ...." as if the newest version were a older one.
The "competing" packages were: foo-bar-1.0.0+git0+93a939c4-r0.24 foo-bar-1.0.0+git0+f95bf929-r0.26 So we have a system where foo-bar-1.0.0+git0+93a939c4-r0.24 is installed, and a package feed which offers foo-bar-1.0.0+git0+f95bf929-r0.26, dnf is convinced that f95bf929-r0.26 is older than 93a939c4-r0.24 - which is not as expected, IMHO. BitBake has the "Package version for package XYZ went backwards which would break package feeds" error message, but it wouldn't even trigger in this case, since after a lexical comparison, f95bf929 is "higher" than 93a939c4. But turns out that libsolv implements a whole different algorithm for comparing version strings [1] which splits them into 'tokens' of either only numerical or only alpha characters, and compares the length of each. In above example it arrives at the commit hash after everything preceding it is equal, then it processes "93" for the 93a939c4 (delimited by "a") and "" for f95bf929 (delimited by "f"). Comparing "93" and "" the former is 2 characters longer, so the 93a939c4 version is considered more recent. I think this behavior is counter-intuitive and there are lots of upstream recipes that append "git0+<hash>" to their PV; is the general consensus that you *must never* change the Git revision of such a package without incrementing the PV preceding the "git0" part? (Incrementing the PR doesn't help here, since dnf/libsolv never considers the PR if a PV is found to be newer). I patched libsolv on our systems now to ignore everything following a "git0" in a PV, since we absolutely need to be able to update packages between version bumps. Would be interested to learn if this behavior of dnf/libsolv is already known and what is the commonly accepted "best practice" dealing with it. Thanks, Patrick [1]: https://github.com/openSUSE/libsolv/blob/7b0788fb7ee937b7d38829bcec47760e42779a66/src/evr.c#L74-L155
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#62629): https://lists.yoctoproject.org/g/yocto/message/62629 Mute This Topic: https://lists.yoctoproject.org/mt/104621339/21656 Group Owner: yocto+ow...@lists.yoctoproject.org Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
