summary refs log tree commit diff
path: root/gnu/packages.scm
diff options
context:
space:
mode:
authorLudovic Courtès <ludo@gnu.org>2019-02-15 22:58:29 +0100
committerLudovic Courtès <ludo@gnu.org>2019-02-16 01:00:08 +0100
commit36754eee28187b41e9a6ef15cd3c9911449a4e8d (patch)
tree6ddea122d835508372e1018e97529e68ce58acf7 /gnu/packages.scm
parentba48895899a117d6ace2209c3f54411a4a989133 (diff)
downloadguix-36754eee28187b41e9a6ef15cd3c9911449a4e8d.tar.gz
packages: Remove duplicates from package cache.
Previously the same package could appear several times if several
variables were bound to it, as is notably the case for "python"
currently.  This, in turn, would lead to obnoxious "ambiguous package
specification" messages.

* gnu/packages.scm (generate-package-cache)[expand-cache]: Change RESULT
to RESULT+SEEN and adjust accordingly.
Call 'first' on the result of 'fold-module-public-variables*'.
* tests/packages.scm ("fold-available-packages with/without cache"):
Check for lack of duplicates in FROM-CACHE.
Diffstat (limited to 'gnu/packages.scm')
-rw-r--r--gnu/packages.scm53
1 files changed, 30 insertions, 23 deletions
diff --git a/gnu/packages.scm b/gnu/packages.scm
index a1814205f9..7b17e70c53 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -371,34 +371,41 @@ reducing the memory footprint."
   (define cache-file
     (string-append directory %package-cache-file))
 
-  (define (expand-cache module symbol variable result)
+  (define (expand-cache module symbol variable result+seen)
     (match (false-if-exception (variable-ref variable))
       ((? package? package)
-       (if (hidden-package? package)
-           result
-           (cons `#(,(package-name package)
-                    ,(package-version package)
-                    ,(module-name module)
-                    ,symbol
-                    ,(package-outputs package)
-                    ,(->bool (member (%current-system)
-                                     (package-supported-systems package)))
-                    ,(->bool (package-superseded package))
-                    ,@(let ((loc (package-location package)))
-                        (if loc
-                            `(,(location-file loc)
-                              ,(location-line loc)
-                              ,(location-column loc))
-                            '(#f #f #f))))
-                 result)))
+       (match result+seen
+         ((result . seen)
+          (if (or (vhash-assq package seen)
+                  (hidden-package? package))
+              (cons result seen)
+              (cons (cons `#(,(package-name package)
+                             ,(package-version package)
+                             ,(module-name module)
+                             ,symbol
+                             ,(package-outputs package)
+                             ,(->bool
+                               (member (%current-system)
+                                       (package-supported-systems package)))
+                             ,(->bool (package-superseded package))
+                             ,@(let ((loc (package-location package)))
+                                 (if loc
+                                     `(,(location-file loc)
+                                       ,(location-line loc)
+                                       ,(location-column loc))
+                                     '(#f #f #f))))
+                          result)
+                    (vhash-consq package #t seen))))))
       (_
-       result)))
+       result+seen)))
 
   (define exp
-    (fold-module-public-variables* expand-cache '()
-                                   (all-modules (%package-module-path)
-                                                #:warn
-                                                warn-about-load-error)))
+    (first
+     (fold-module-public-variables* expand-cache
+                                    (cons '() vlist-null)
+                                    (all-modules (%package-module-path)
+                                                 #:warn
+                                                 warn-about-load-error))))
 
   (mkdir-p (dirname cache-file))
   (call-with-output-file cache-file