mesboot broken for old commits

[zimoun]

Hi,

Investigating [0], and working on rebuild a tiny part of "Preservation
of Guix", I note that mesboot is broken for several old commits:

 - 087c94019d from Feb 2020 because of gcc-core-mesboot
 - df5a2e4f83 from Mar 2020 because of coreutils-mesboot
 - e364758d44 from Sep 2020 because of many mesboot components


Two questions:

 1. Is it fixable?  Other said, can we fix the time-machine for these
 commits?

 2. How can we prevent that?


0: <https://lists.gnu.org/archive/html/guix-devel/2022-02/msg00000.html>

Cheers,
simon