[bug#53818] [PATCH 0/3] Add Repology updater

[Nicolas Goaziou]

Hello,

Xinglu Chen <public@yoctocell.xyz> writes:

> Yeah, I have noticed that it sometimes thinks that a version like
> “20080323” is newer than something like “0.1.2-0.a1b2b3d”, even though
> it might not necessarily be true.  This seems to be the case for a lot
> of Common Lisp packages which usually don’t have any proper releases.

[...]

> In my testing, the “newest” status does a pretty good job (besides the
> problem I mentioned above)
>
> Some other “bad” updates I found[*] are listed below (excluding Common Lisp
> packages).
>
> --8<---------------cut here---------------start------------->8---
> guile-ac-d-bus would be upgraded from 1.0.0-beta.0 to 1.0.0-beta0
> sic would be upgraded from 1.2 to 1.2+20210506_058547e
> tla2tools would be upgraded from 1.7.1-0.6932e19 to 20140313
> quickjs would be upgraded from 2021-03-27 to 2021.03.27
> stow would be upgraded from 2.3.1 to 2.3.1+5.32
> cube would be upgraded from 4.3.5 to 2005.08.29
> python-ratelimiter would be upgraded from 1.2.0 to 1.2.0.post0
> gr-osmosdr would be upgraded from 0.2.3-0.a100eb0 to 0.2.3.20210128
> countdown would be upgraded from 1.0.0 to 20150606
> http-parser would be upgraded from 2.9.4-1.ec8b5ee to 2.9.4.20201223
> xlsx2csv would be upgraded from 0.7.4 to 20200427211949
> keynav would be upgraded from 0.20110708.0 to 20150730+4ae486d
> --8<---------------cut here---------------end--------------->8---
>
> It seems like most of these could be solved by checking if the version
> scheme changed from semver to calver.  I think that’s a pretty good
> result considering how many packages we have.

I think this would not cut it.

As I wrote, almost any package using `git-version' is going to create
a version mismatch. This is because we consider

  (git-version "X.Y" revision commit)

to be greater than "X.Y" whereas Repology either ignore the version, or
consider it to be a pre-release before "X.Y". See, e.g., "emacs:circe"
project, or "joycond". This, I think, the most prominent category of
comparison failures.

Also, there are versions which are plain wrong, e.g., "emacs:csv-mode",
and disqualify correct and up-to-date version. There are also version
disagreement in, e.g., "colobot", or upstream disagreement, e.g.,
"emacs:scala-mode".

See also "emacs:geiser-racket", "python:folium" or "higan" for other
projects with versioning issues.

Regards,
-- 
Nicolas Goaziou