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derivations: Add `derivation-path->output-paths'. 

* guix/derivations.scm (derivation-path->output-paths): New procedure.
* tests/derivations.scm ("multiple-output derivation"): Test it.
This commit is contained in:
Ludovic Courtès 2013-01-05 23:51:13 +01:00
parent 3441e16497
commit 7244a5f74e
2 changed files with 17 additions and 3 deletions
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13
guix/derivations.scm
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@ -1,5 +1,5 @@
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
;;; Copyright (C) 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guix.
;;;
@ -55,6 +55,7 @@
read-derivation
write-derivation
derivation-path->output-path
derivation-path->output-paths
derivation
%guile-for-build
@ -288,6 +289,16 @@ path of its output OUTPUT."
(outputs (derivation-outputs drv)))
(and=> (assoc-ref outputs output) derivation-output-path)))))
(define (derivation-path->output-paths path)
"Read the derivation from PATH (`/nix/store/xxx.drv'), and return the
list of name/path pairs of its outputs."
(let* ((drv (call-with-input-file path read-derivation))
(outputs (derivation-outputs drv)))
(map (match-lambda
((name . output)
(cons name (derivation-output-path output))))
outputs)))
;;;
;;; Derivation primitive.

7
tests/derivations.scm
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@ -1,5 +1,5 @@
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
;;; Copyright (C) 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guix.
;;;
@ -234,7 +234,10 @@
(and succeeded?
(let ((one (derivation-path->output-path drv-path "out"))
(two (derivation-path->output-path drv-path "second")))
(and (eq? 'one (call-with-input-file one read))
(and (lset= equal?
(derivation-path->output-paths drv-path)
`(("out" . ,one) ("second" . ,two)))
(eq? 'one (call-with-input-file one read))
(eq? 'two (call-with-input-file two read)))))))
(test-assert "multiple-output derivation, non-alphabetic order"