From 268896444bed7b958add74b2e1e86ff802c5f5cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Fri, 16 Aug 2019 18:41:55 +0200
Subject: derivations: Delete duplicate inputs when computing derivation hash.

Fixes <https://bugs.gnu.org/36777>.
Reported by Carl Dong <contact@carldong.me>.

* guix/derivations.scm (derivation/masked-inputs): Call
'delete-duplicates' on INPUTS.
* tests/derivations.scm ("derivation with duplicate fixed-output inputs"):
New test.
---
 guix/derivations.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'guix/derivations.scm')

diff --git a/guix/derivations.scm b/guix/derivations.scm
index 92d50503ce..b3928920e2 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -685,7 +685,7 @@ name of each input with that input's hash."
                              (make-derivation-input hash sub-drvs))))
                         inputs)))
        (make-derivation outputs
-                        (sort inputs
+                        (sort (delete-duplicates inputs)
                               (lambda (drv1 drv2)
                                 (string<? (derivation-input-derivation drv1)
                                           (derivation-input-derivation drv2))))
-- 
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