> It actually does, but it has no side effect. I know that printing is a side effect. Why do you recommend to use 'alist-cons'? If it's not possible to display anything, then 'roll-back' won't be able to print the following messages.
(simple-format #t "guix-package: switching from generation ~a to ~a~%"
current-profile-number previous-profile-number)
(leave (_ (string-append
"guix-package: previous profile doesn't exist; "
"not rolling back~%")))
Actually, if the above is correct, then it won't be possible to use
'roll-back' at all. (Because it creates symlinks.)
I think that I misunderstood you. Please elaborate.
> When ‘--profile’ is passed, the result of ‘parse-options’ contains a
> pair whose key is ‘profile’. The (assoc-ref opts 'profile) calls that
> you see retrieve the argument given to ‘--profile’.
It's clear. But where should I call (assoc-ref opts 'profile)? Should
I do it in 'process-query'?
Nikita
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