> ‘%store’ is a SRFI-39 parameter (info "(guile) Parameters"), aka. a > dynamically-scoped variable.
> It is initialized with the ‘parameterize’ form, which sets its value for
> the dynamic extent of its body.
I don’t understand what code initializes ‘%store’.
For example, I have one generation in the ‘test’ profile. So ‘test’
points to ‘test-1-link’. If I do
scheme@(guix scripts package)> (roll-back "test")
I get an error
guix/derivations.scm:428:17: In procedure derivation->output-path:
guix/derivations.scm:428:17: In procedure struct_vtable: Wrong type argument in
position 1 (expecting struct): #f
Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue.
scheme@(guix scripts package) [1]>
This error is produced by (profile-derivation (%store) '()) since
‘%store’ is set to #f.
But why does this command work?
$ ./pre-inst-env guix package -p test --roll-back
switching from generation 1 to 0
As far as I understand, this code is called when the above command is
invoked:
;; First roll back if asked to.
(if (and (assoc-ref opts 'roll-back?) (not dry-run?))
(begin
(roll-back profile)
I don’t see any references to ‘%store’ here.
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