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-rw-r--r--guix/derivations.scm2
-rw-r--r--tests/derivations.scm32
2 files changed, 33 insertions, 1 deletions
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))))
diff --git a/tests/derivations.scm b/tests/derivations.scm
index 368012d2b2..db73d19b3a 100644
--- a/tests/derivations.scm
+++ b/tests/derivations.scm
@@ -410,6 +410,38 @@
(equal? (derivation->output-path final1)
(derivation->output-path final2)))))
+(test-assert "derivation with duplicate fixed-output inputs"
+ ;; Here we create a derivation that has two inputs, both of which are
+ ;; fixed-output leading to the same result. This test ensures the hash of
+ ;; that derivation is correctly computed, namely that duplicate inputs are
+ ;; coalesced. See <https://bugs.gnu.org/36777>.
+ (let* ((builder1 (add-text-to-store %store "fixed-builder1.sh"
+ "echo -n hello > $out" '()))
+ (builder2 (add-text-to-store %store "fixed-builder2.sh"
+ "echo hey; echo -n hello > $out" '()))
+ (hash (sha256 (string->utf8 "hello")))
+ (fixed1 (derivation %store "fixed"
+ %bash `(,builder1)
+ #:hash hash #:hash-algo 'sha256))
+ (fixed2 (derivation %store "fixed"
+ %bash `(,builder2)
+ #:hash hash #:hash-algo 'sha256))
+ (builder3 (add-text-to-store %store "builder.sh"
+ "echo fake builder"))
+ (final (derivation %store "final"
+ %bash `(,builder3)
+ #:sources (list %bash builder3)
+ #:inputs (list (derivation-input fixed1)
+ (derivation-input fixed2)))))
+ (and (derivation? final)
+ (match (derivation-inputs final)
+ (((= derivation-input-derivation one)
+ (= derivation-input-derivation two))
+ (and (not (string=? (derivation-file-name one)
+ (derivation-file-name two)))
+ (string=? (derivation->output-path one)
+ (derivation->output-path two))))))))
+
(test-assert "multiple-output derivation"
(let* ((builder (add-text-to-store %store "my-fixed-builder.sh"
"echo one > $out ; echo two > $second"