bug#41604: guix pull impossible after rebasing a local repository

[zimoun]

Hi Ludo,

On Sun, 7 Jun 2020 at 23:16, Ludovic Courtès <ludo@gnu.org> wrote:

> I did this:
>
>   
> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=1fd7de45f218ce572a3fe87764ad15927e3dbdc4

Cool!  Thank you.

> So now, in a situation like John described, ‘guix pull’ will print the
> error and hint for unrelated commits.

Yes! Perfect! :-)

>From a removed commit: "guix pull" says:

--8<---------------cut here---------------start------------->8---
guix pull: error: aborting update of channel 'guix' to commit
e78275608065ef073775fabb9f1a757da65851f2, which is not a descendant of
b50fb18a610e2a495624bf4570bec60265332615
hint: Use `--allow-downgrades' to force this downgrade.
--8<---------------cut here---------------end--------------->8---

then using the hint, it says:

--8<---------------cut here---------------start------------->8---
guix pull: warning: moving channel 'guix' from
b50fb18a610e2a495624bf4570bec60265332615 to unrelated commit
e78275608065ef073775fabb9f1a757da65851f2
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git   e782756
--8<---------------cut here---------------end--------------->8---


Just to note that the hint

--8<---------------cut here---------------start------------->8---
hint: This could indicate that the channel has been tampered with and is trying
to force a roll-back, preventing you from getting the latest updates.  If
you think this is not the case, explicitly allow non-forward updates.
--8<---------------cut here---------------end--------------->8---

does not report explicitly the option '--allow-downgrades'.


> I think we can close now!

Definitively! :-)

Cheers,
simon