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store: 'references/substitutes' really caches its result.

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Until now the cache was always empty because 'for-each' was passed ITEMS
as its second argument, and ITEMS was the empty list at that point.

* guix/store.scm (references/substitutes): Add 'requested' variable.
Use it as second argument of 'for-each' in base case.
This commit is contained in:
Ludovic Courtès 2017-07-02 00:37:49 +02:00
parent 2633bd324b
commit b2fde4800d
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1 changed files with 3 additions and 2 deletions
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guix/store.scm
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@ -1009,7 +1009,8 @@ (define (references/substitutes store items)
length as ITEMS. Query substitute information for any item missing from the
store at once. Raise a '&nix-protocol-error' exception if reference
information for one of ITEMS is missing."
(let* ((local-refs (map (lambda (item)
(let* ((requested items)
(local-refs (map (lambda (item)
(or (hash-ref %reference-cache item)
(guard (c ((nix-protocol-error? c) #f))
(references store item))))
@ -1040,7 +1041,7 @@ (define (references/substitutes store items)
(()
(let ((result (reverse result)))
(for-each (cut hash-set! %reference-cache <> <>)
items result)
requested result)
result))
((item items ...)
(match local-refs