Hi

I would like it to be easy for newcomers to do the right thing when pulling.

I suggest we by default give guix pullers a bit more information and interaction.
Something like this:
"Checking for newly built derivations of guix at hydra.gnu.org...
(table)
Date Commit Succeeded for x64?
28/6 54d84d8 yes
...
...
...

Pulling based on default commit selection scheme (see --help for details)
Most recently built commit is x4678x85 built x hours ago.
Continuing in 10 seconds...
Press ctrl+c to abort. "

Guix pull gets a new argument " -d" allowing you to specify the days old commit you want to select.
E. G. Guix pull -d 5 selects a commit build successfully 5 days ago by hydra.

Guix weather could show the table only, if the argument --guix-pull was given.
--
Cheers Swedebugia