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authorLudovic Courtès <ludo@gnu.org>2017-05-31 09:55:56 +0200
committerLudovic Courtès <ludo@gnu.org>2017-06-02 18:47:06 +0200
commitef51ac21eec28de3b0fb693f88be5f3c494d464a (patch)
tree128869049a4b20dfbc8fa31ee6693caa5135adcf /guix/derivations.scm
parentfb226b43511671bee3463a02eea9e041d2610fef (diff)
derivations: 'substitution-oracle' returns a <substitutable>.
* guix/derivations.scm (substitution-oracle): Use 'substitution-path-info' instead of 'substitution-paths'. Turn SUBST into a vhash from path to <substitutable>. Change the returned procedure to provide a <substitutable> instead of a Boolean. * tests/derivations.scm ("substitution-oracle and #:substitute? #f"): Mock 'substitutable-path-info' instead of 'substitutable-paths'.
Diffstat (limited to 'guix/derivations.scm')
-rw-r--r--guix/derivations.scm16
1 files changed, 12 insertions, 4 deletions
diff --git a/guix/derivations.scm b/guix/derivations.scm
index 9aaab05ecb..5e457f1893 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -271,13 +271,14 @@ result is the set of prerequisites of DRV not already in valid."
(define* (substitution-oracle store drv
#:key (mode (build-mode normal)))
"Return a one-argument procedure that, when passed a store file name,
-returns #t if it's substitutable and #f otherwise. The returned procedure
+returns a 'substitutable?' if it's substitutable and #f otherwise.
+The returned procedure
knows about all substitutes for all the derivations listed in DRV, *except*
those that are already valid (that is, it won't bother checking whether an
item is substitutable if it's already on disk); it also knows about their
prerequisites, unless they are themselves substitutable.
-Creating a single oracle (thus making a single 'substitutable-paths' call) and
+Creating a single oracle (thus making a single 'substitutable-path-info' call) and
reusing it is much more efficient than calling 'has-substitutes?' or similar
repeatedly, because it avoids the costs associated with launching the
substituter many times."
@@ -318,8 +319,15 @@ substituter many times."
(cons* self (dependencies drv) result)))))
'()
drv))))
- (subst (list->set (substitutable-paths store paths))))
- (cut set-contains? subst <>)))
+ (subst (fold (lambda (subst vhash)
+ (vhash-cons (substitutable-path subst) subst
+ vhash))
+ vlist-null
+ (substitutable-path-info store paths))))
+ (lambda (item)
+ (match (vhash-assoc item subst)
+ (#f #f)
+ ((key . value) value)))))
(define* (derivation-prerequisites-to-build store drv
#:key