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-rw-r--r--guix/import/gem.scm19
1 files changed, 13 insertions, 6 deletions
diff --git a/guix/import/gem.scm b/guix/import/gem.scm
index 0e5bb7e635..ad1343bff4 100644
--- a/guix/import/gem.scm
+++ b/guix/import/gem.scm
@@ -5,6 +5,7 @@
 ;;; Copyright © 2020, 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2020 Martin Becze <mjbecze@riseup.net>
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -81,10 +82,12 @@
   (requirements  gem-dependency-requirements))    ;string
 
 
-(define (rubygems-fetch name)
-  "Return a <gem> record for the package NAME, or #f on failure."
+(define* (rubygems-fetch name #:optional version)
+  "Return a <gem> record for the package NAME and VERSION, or #f on failure.  If VERSION is #f or missing, return the latest version gem."
   (and=> (json-fetch
-          (string-append "https://rubygems.org/api/v1/gems/" name ".json"))
+          (if version
+              (string-append "https://rubygems.org/api/v2/rubygems/" name "/versions/" version ".json")
+              (string-append "https://rubygems.org/api/v1/gems/" name ".json")))
          json->gem))
 
 (define (ruby-package-name name)
@@ -122,8 +125,11 @@ VERSION, HASH, HOME-PAGE, DESCRIPTION, DEPENDENCIES, and LICENSES."
 
 (define* (gem->guix-package package-name #:key (repo 'rubygems) version)
   "Fetch the metadata for PACKAGE-NAME from rubygems.org, and return the
-`package' s-expression corresponding to that package, or #f on failure."
-  (let ((gem (rubygems-fetch package-name)))
+`package' s-expression corresponding to that package, or #f on failure.
+Optionally include a VERSION string to fetch a specific version gem."
+  (let ((gem (if version
+                 (rubygems-fetch package-name version)
+                 (rubygems-fetch package-name))))
     (if gem
         (let* ((dependencies-names (map gem-dependency-name
                                         (gem-dependencies-runtime
@@ -189,4 +195,5 @@ package on RubyGems."
   (recursive-import package-name
                     #:repo '()
                     #:repo->guix-package gem->guix-package
-                    #:guix-name ruby-package-name))
+                    #:guix-name ruby-package-name
+                    #:version version))