[Pkg-shadow-devel] Bug#1132509: uidmap: getsubids look up /etc/subgid by gid instead of uid when using numerical values

[Johannes Schauer Marin Rodrigues]

Hi Jochen,

Quoting Aurelien Jarno (2026-04-01 22:40:01)
> Since version 0.91.6, sbuild started to use getsubids to parse
> /etc/subgid [1]. The format of this file is supposed to be [2]:
> 
>   login name or UID : numerical subordinate group ID : numerical subordinate group ID count
> 
> Unfortunately getsubids parses it as login name or *GID*. This breaks
> when this file contains UID and when UID != GID:

this bug is a bit funny because you fixed the reverse issue in mmdebstrap :)

https://gitlab.mister-muffin.de/josch/mmdebstrap/commit/374ae3dc99e5d8a5a176939c3846e790e890a0e7

I'd also like to move mmdebstrap from /etc/subgid parsing to calling getsubids
if available (since oldoldstable).

Thanks!

cheers, josch
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