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derivations: Avoid another call to 'read-derivation-from-file'.

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This is a followup to 5cf4b26d52bcea382d98fb4becce89be9ee37b55.

* guix/derivations.scm (derivation-path->base16-hash): Rename to...
(derivation-base16-hash): ... this, and take a <derivation> rather than
a file name.  Use 'mlambdaq' instead of 'mlambda'.
(derivation/masked-inputs): Adjust accordingly.
(invalidate-derivation-caches!): Likewise.
This commit is contained in:
Ludovic Courtès 2019-07-03 22:36:56 +02:00
parent 1653b23564
commit c14a2b289d
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1 changed files with 7 additions and 10 deletions
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guix/derivations.scm
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@ -652,12 +652,10 @@ list of name/path pairs of its outputs."
;;; Derivation primitive.
;;;
(define derivation-path->base16-hash
(mlambda (file)
"Return a string containing the base16 representation of the hash of the
derivation at FILE."
(bytevector->base16-string
(derivation-hash (read-derivation-from-file file)))))
(define derivation-base16-hash
(mlambdaq (drv)
"Return a string containing the base16 representation of the hash of DRV."
(bytevector->base16-string (derivation-hash drv))))
(define (derivation/masked-inputs drv)
"Assuming DRV is a regular derivation (not fixed-output), replace the file
@ -666,9 +664,8 @@ name of each input with that input's hash."
(($ <derivation> outputs inputs sources
system builder args env-vars)
(let ((inputs (map (match-lambda
(($ <derivation-input> (= derivation-file-name path)
sub-drvs)
(let ((hash (derivation-path->base16-hash path)))
(($ <derivation-input> drv sub-drvs)
(let ((hash (derivation-base16-hash drv)))
(make-derivation-input hash sub-drvs))))
inputs)))
(make-derivation outputs
@ -886,7 +883,7 @@ long-running processes that know what they're doing. Use with care!"
;; Typically this is meant to be used by Cuirass and Hydra, which can clear
;; caches when they start evaluating packages for another architecture.
(invalidate-memoization! derivation->bytevector)
(invalidate-memoization! derivation-path->base16-hash)
(invalidate-memoization! derivation-base16-hash)
;; FIXME: Comment out to work around <https://bugs.gnu.org/36487>.
;; (hash-clear! %derivation-cache)