derivations: Add 'substitution-oracle' and use it.

This makes 'guix environment PACKAGE' significantly faster when
substitutes are enabled.  Before that, it would lead to many invocations
of 'guix substitute-binary', one per 'derivation-prerequisites-to-build'
call.  Now, all these are replaced by a single invocation.

* guix/derivations.scm (derivation-output-paths, substitution-oracle):
  New procedures.
  (derivation-prerequisites-to-build): Replace #:use-substitutes? with
  #:substitutable?.  Remove the local 'derivation-output-paths' and
  'substitutable?'.
* guix/ui.scm (show-what-to-build): Add 'substitutable?'.  Pass it to
  'derivation-prerequisites-to-build'.
  [built-or-substitutable?]: Use it instead of 'has-substitutes?'.
* tests/derivations.scm ("derivation-prerequisites-to-build and
  substitutes"): Use #:substitutable? instead of #:use-substitutes?.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/derivations.scm b/tests/derivations.scm
index 25e6f75657..8e592ab6a1 100644
--- a/tests/derivations.scm
+++ b/tests/derivations.scm
@@ -589,7 +589,8 @@
                     (derivation-prerequisites-to-build store drv))
                    ((build* download*)
                     (derivation-prerequisites-to-build store drv
-                                                       #:use-substitutes? #f)))
+                                                       #:substitutable?
+                                                       (const #f))))
         (and (null? build)
              (equal? download (list output))
              (null? download*)