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-rw-r--r--guix/gexp.scm25
-rw-r--r--tests/gexp.scm16
2 files changed, 37 insertions, 4 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm
index ba0d642b17..537875b6b7 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -506,9 +506,10 @@ whether this should be considered a \"native\" input or not."
(set-record-type-printer! <gexp-output> write-gexp-output)
-(define (gexp-attribute gexp self-attribute)
+(define* (gexp-attribute gexp self-attribute #:optional (equal? equal?))
"Recurse on GEXP and the expressions it refers to, summing the items
-returned by SELF-ATTRIBUTE, a procedure that takes a gexp."
+returned by SELF-ATTRIBUTE, a procedure that takes a gexp. Use EQUAL? as the
+second argument to 'delete-duplicates'."
(if (gexp? gexp)
(delete-duplicates
(append (self-attribute gexp)
@@ -524,13 +525,29 @@ returned by SELF-ATTRIBUTE, a procedure that takes a gexp."
lst))
(_
'()))
- (gexp-references gexp))))
+ (gexp-references gexp)))
+ equal?)
'())) ;plain Scheme data type
(define (gexp-modules gexp)
"Return the list of Guile module names GEXP relies on. If (gexp? GEXP) is
false, meaning that GEXP is a plain Scheme object, return the empty list."
- (gexp-attribute gexp gexp-self-modules))
+ (define (module=? m1 m2)
+ ;; Return #t when M1 equals M2. Special-case '=>' specs because their
+ ;; right-hand side may not be comparable with 'equal?': it's typically a
+ ;; file-like object that embeds a gexp, which in turn embeds closure;
+ ;; those closures may be 'eq?' when running compiled code but are unlikely
+ ;; to be 'eq?' when running on 'eval'. Ignore the right-hand side to
+ ;; avoid this discrepancy.
+ (match m1
+ (((name1 ...) '=> _)
+ (match m2
+ (((name2 ...) '=> _) (equal? name1 name2))
+ (_ #f)))
+ (_
+ (equal? m1 m2))))
+
+ (gexp-attribute gexp gexp-self-modules module=?))
(define (gexp-extensions gexp)
"Return the list of Guile extensions (packages) GEXP relies on. If (gexp?
diff --git a/tests/gexp.scm b/tests/gexp.scm
index 813ea2ff6f..467370f8cb 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -680,6 +680,22 @@
#~(foo #$@(list (with-imported-modules '((foo)) #~+)
(with-imported-modules '((bar)) #~-)))))
+(test-assert "gexp-modules deletes duplicates" ;<https://bugs.gnu.org/32966>
+ (let ((make-file (lambda ()
+ ;; Use 'eval' to make sure we get an object that's not
+ ;; 'eq?' nor 'equal?' due to the closures it embeds.
+ (eval '(scheme-file "bar.scm" #~(define-module (bar)))
+ (current-module)))))
+ (define result
+ ((@@ (guix gexp) gexp-modules)
+ (with-imported-modules `(((bar) => ,(make-file))
+ ((bar) => ,(make-file))
+ (foo) (foo))
+ #~+)))
+
+ (match result
+ (((('bar) '=> (? scheme-file?)) ('foo)) #t))))
+
(test-equal "gexp-modules and literal Scheme object"
'()
(gexp-modules #t))