bug#46212: ci.guix.gnu.org narinfos with excessive NarSize

[Ludovic Courtès]

Christopher Baines <mail@cbaines.net> skribis:

> /gnu/store/qln574djfgl8h9glij9id8jips7nnrlw-flightgear-2018.3.5
> NarSize: 18446744072099351584
>
> /gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1
> NarSize: 18446744071612438544
>
> /gnu/store/wd9z64xpck56xzf52jwlpg8vb610b0ym-repeat-masker-4.1.1
> NarSize: 18446744071612438544

The key point here is that ‘narSize’ in the database is negative:

--8<---------------cut here---------------start------------->8---
sqlite> select * from validpaths where path = 
'/gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1';
43262123|/gnu/store/qhix6afvy2a6n7hlx4qgdns461p8kdnv-repeat-masker-4.1.1|sha256:33328e16d8d83dcf1a6e031598dbc517aff18e6c7ccd55f7894102bab55fcdb9|1611849907|/gnu/store/rr532q5fmwj1gafdgk6nhxg9khnbsw3z-repeat-masker-4.1.1.drv|-2097113072
--8<---------------cut here---------------end--------------->8---

The actual nar size in this case is just above 2³¹ so most likely we’re
seeing a signed integer wrapping error.

I believe this is a very recent regression (the registration data for
the item above is Jan. 28th); we have older store items with a correct
‘narSize’, such as
<https://ci.guix.gnu.org/nm6w84c9zj3yiylal3dk1sqzxq11sjzw.narinfo>.

Thoughts?

Ludo’.