diff mbox series

[bug#57694,1/1] import: gem: Support for importing a specified version of a gem.

Message ID 20220909134736.18808-2-higashi@taiju.info
State Accepted
Headers show
Series Support for importing a specified version of a gem. | expand

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Commit Message

Taiju HIGASHI Sept. 9, 2022, 1:47 p.m. UTC
* guix/import/gem.scm: (rubygems-fetch, gem->guix-package)
(gem-recursive-import): Fix to fetch the specified version of the gem.
* guix/scripts/import/gem.scm (show-help): Modify the help message.
(guix-import-gem): Modify the version number to be passed to subsequent
procedures
* tests/gem.scm: Add tests.
---
 guix/import/gem.scm         |  19 ++++--
 guix/scripts/import/gem.scm |  39 +++++++------
 tests/gem.scm               | 113 ++++++++++++++++++++++++++++++++++++
 3 files changed, 148 insertions(+), 23 deletions(-)

Comments

Taiju HIGASHI Sept. 14, 2022, 9:55 a.m. UTC | #1
Hi Chris,

Could you give me your opinion on this patch?
Is this patch worth it?

Taiju HIGASHI <higashi@taiju.info> writes:

> * guix/import/gem.scm: (rubygems-fetch, gem->guix-package)
> (gem-recursive-import): Fix to fetch the specified version of the gem.
> * guix/scripts/import/gem.scm (show-help): Modify the help message.
> (guix-import-gem): Modify the version number to be passed to subsequent
> procedures
> * tests/gem.scm: Add tests.
> ---
>  guix/import/gem.scm         |  19 ++++--
>  guix/scripts/import/gem.scm |  39 +++++++------
>  tests/gem.scm               | 113 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 148 insertions(+), 23 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 @@ (define-json-mapping <gem-dependency> make-gem-dependency gem-dependency?
>    (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 @@ (define (make-gem-sexp name version hash home-page synopsis description
>
>  (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 @@ (define* (gem-recursive-import package-name #:optional version)
>    (recursive-import package-name
>                      #:repo '()
>                      #:repo->guix-package gem->guix-package
> -                    #:guix-name ruby-package-name))
> +                    #:guix-name ruby-package-name
> +                    #:version version))
> diff --git a/guix/scripts/import/gem.scm b/guix/scripts/import/gem.scm
> index 82deac16ad..2e646e4475 100644
> --- a/guix/scripts/import/gem.scm
> +++ b/guix/scripts/import/gem.scm
> @@ -4,6 +4,7 @@
>  ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
>  ;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
>  ;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
> +;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
>  ;;;
>  ;;; This file is part of GNU Guix.
>  ;;;
> @@ -31,6 +32,7 @@ (define-module (guix scripts import gem)
>    #:use-module (srfi srfi-37)
>    #:use-module (ice-9 match)
>    #:use-module (ice-9 format)
> +  #:use-module (ice-9 receive)
>    #:export (guix-import-gem))
>
>  
> @@ -42,8 +44,9 @@ (define %default-options
>    '())
>
>  (define (show-help)
> -  (display (G_ "Usage: guix import gem PACKAGE-NAME
> -Import and convert the RubyGems package for PACKAGE-NAME.\n"))
> +  (display (G_ "Usage: guix import gem PACKAGE-NAME[@VERSION]
> +Import and convert the RubyGems package for PACKAGE-NAME.  Optionally, a
> +version can be specified after the arobas (@) character.\n"))
>    (display (G_ "
>    -h, --help             display this help and exit"))
>    (display (G_ "
> @@ -86,21 +89,23 @@ (define (parse-options)
>                               (_ #f))
>                             (reverse opts))))
>      (match args
> -      ((package-name)
> -       (let ((code (if (assoc-ref opts 'recursive)
> -                       (map (match-lambda
> -                              ((and ('package ('name name) . rest) pkg)
> -                               `(define-public ,(string->symbol name)
> -                                  ,pkg))
> -                              (_ #f))
> -                            (gem-recursive-import package-name 'rubygems))
> -                       (let ((sexp (gem->guix-package package-name)))
> -                         (if sexp sexp #f)))))
> -         (match code
> -           ((or #f '(#f))
> -            (leave (G_ "failed to download meta-data for package '~a'~%")
> -                   package-name))
> -           (_ code))))
> +      ((spec)
> +       (receive (package-name package-version)
> +           (package-name->name+version spec)
> +         (let ((code (if (assoc-ref opts 'recursive)
> +                         (map (match-lambda
> +                                ((and ('package ('name name) . rest) pkg)
> +                                 `(define-public ,(string->symbol name)
> +                                    ,pkg))
> +                                (_ #f))
> +                              (gem-recursive-import package-name package-version))
> +                         (let ((sexp (gem->guix-package package-name #:version package-version)))
> +                           (if sexp sexp #f)))))
> +           (match code
> +             ((or #f '(#f))
> +              (leave (G_ "failed to download meta-data for package '~a'~%")
> +                     package-name))
> +             (_ code)))))
>        (()
>         (leave (G_ "too few arguments~%")))
>        ((many ...)
> diff --git a/tests/gem.scm b/tests/gem.scm
> index c8fe15398e..6aa0d279dc 100644
> --- a/tests/gem.scm
> +++ b/tests/gem.scm
> @@ -3,6 +3,7 @@
>  ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
>  ;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
>  ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
> +;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
>  ;;;
>  ;;; This file is part of GNU Guix.
>  ;;;
> @@ -44,6 +45,22 @@ (define test-foo-json
>    \"licenses\": [\"MIT\", \"Apache 2.0\"]
>  }")
>
> +(define test-foo-v2-json
> +  "{
> +  \"name\": \"foo\",
> +  \"version\": \"2.0.0\",
> +  \"sha\": \"f3676eafca9987cb5fe263df1edf2538bf6dafc712b30e17be3543a9680547a8\",
> +  \"info\": \"A cool gem\",
> +  \"homepage_uri\": \"https://example.com\",
> +  \"dependencies\": {
> +    \"runtime\": [
> +      { \"name\": \"bundler\" },
> +      { \"name\": \"bar\" }
> +    ]
> +  },
> +  \"licenses\": [\"MIT\", \"Apache 2.0\"]
> +}")
> +
>  (define test-bar-json
>    "{
>    \"name\": \"bar\",
> @@ -103,6 +120,35 @@ (define test-bundler-json
>        (x
>         (pk 'fail x #f)))))
>
> +(test-assert "gem->guix-package with a specific version"
> +  ;; Replace network resources with sample data.
> +  (mock ((guix http-client) http-fetch
> +         (lambda (url . rest)
> +           (match url
> +             ("https://rubygems.org/api/v2/rubygems/foo/versions/2.0.0.json"
> +              (values (open-input-string test-foo-v2-json)
> +                      (string-length test-foo-v2-json)))
> +             (_ (error "Unexpected URL: " url)))))
> +    (match (gem->guix-package "foo" #:version "2.0.0")
> +      (('package
> +         ('name "ruby-foo")
> +         ('version "2.0.0")
> +         ('source ('origin
> +                    ('method 'url-fetch)
> +                    ('uri ('rubygems-uri "foo" 'version))
> +                    ('sha256
> +                     ('base32
> +                      "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
> +         ('build-system 'ruby-build-system)
> +         ('propagated-inputs ('list 'bundler 'ruby-bar))
> +         ('synopsis "A cool gem")
> +         ('description "This package provides a cool gem")
> +         ('home-page "https://example.com")
> +         ('license ('list 'license:expat 'license:asl2.0)))
> +       #t)
> +      (x
> +       (pk 'fail x #f)))))
> +
>  (test-assert "gem-recursive-import"
>    ;; Replace network resources with sample data.
>    (mock ((guix http-client) http-fetch
> @@ -170,4 +216,71 @@ (define test-bundler-json
>            (x
>             (pk 'fail x #f)))))
>
> +(test-assert "gem-recursive-import with a specific version"
> +  ;; Replace network resources with sample data.
> +  (mock ((guix http-client) http-fetch
> +         (lambda (url . rest)
> +           (match url
> +             ("https://rubygems.org/api/v2/rubygems/foo/versions/2.0.0.json"
> +              (values (open-input-string test-foo-v2-json)
> +                      (string-length test-foo-v2-json)))
> +             ("https://rubygems.org/api/v1/gems/bar.json"
> +              (values (open-input-string test-bar-json)
> +                      (string-length test-bar-json)))
> +             ("https://rubygems.org/api/v1/gems/bundler.json"
> +              (values (open-input-string test-bundler-json)
> +                      (string-length test-bundler-json)))
> +             (_ (error "Unexpected URL: " url)))))
> +        (match (gem-recursive-import "foo" "2.0.0")
> +          ((('package
> +              ('name "ruby-bar")
> +              ('version "1.0.0")
> +              ('source
> +               ('origin
> +                 ('method 'url-fetch)
> +                 ('uri ('rubygems-uri "bar" 'version))
> +                 ('sha256
> +                  ('base32
> +                   "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
> +              ('build-system 'ruby-build-system)
> +              ('propagated-inputs ('list 'bundler))
> +              ('synopsis "Another cool gem")
> +              ('description "Another cool gem")
> +              ('home-page "https://example.com")
> +              ('license #f))                      ;no licensing info
> +            ('package
> +              ('name "ruby-bundler")
> +              ('version "1.14.2")
> +              ('source
> +               ('origin
> +                 ('method 'url-fetch)
> +                 ('uri ('rubygems-uri "bundler" 'version))
> +                 ('sha256
> +                  ('base32
> +                   "1446xiz7zg0bz7kgx9jv84y0s4hpsg61dj5l3qb0i00avc1kxd9v"))))
> +              ('build-system 'ruby-build-system)
> +              ('synopsis "Ruby gem bundler")
> +              ('description "Ruby gem bundler")
> +              ('home-page "https://bundler.io/")
> +              ('license 'license:expat))
> +            ('package
> +              ('name "ruby-foo")
> +              ('version "2.0.0")
> +              ('source
> +               ('origin
> +                 ('method 'url-fetch)
> +                 ('uri ('rubygems-uri "foo" 'version))
> +                 ('sha256
> +                  ('base32
> +                   "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
> +              ('build-system 'ruby-build-system)
> +              ('propagated-inputs ('list 'bundler 'ruby-bar))
> +              ('synopsis "A cool gem")
> +              ('description "This package provides a cool gem")
> +              ('home-page "https://example.com")
> +              ('license ('list 'license:expat 'license:asl2.0))))
> +           #t)
> +          (x
> +           (pk 'fail x #f)))))
> +
>  (test-end "gem")

Cheers,
Christopher Baines Sept. 17, 2022, 5:18 p.m. UTC | #2
Taiju HIGASHI <higashi@taiju.info> writes:

> Hi Chris,
>
> Could you give me your opinion on this patch?
> Is this patch worth it?

Hey,

Unfortunately I haven't had much time to look at Ruby stuff recently,
but these changes look good to me. I tweaked a few minor things and
pushed this as c967d1153cae419e4acbe0dbed8f558d95ced0e3.

Thanks,

Chris

> Taiju HIGASHI <higashi@taiju.info> writes:
>
>> * guix/import/gem.scm: (rubygems-fetch, gem->guix-package)
>> (gem-recursive-import): Fix to fetch the specified version of the gem.
>> * guix/scripts/import/gem.scm (show-help): Modify the help message.
>> (guix-import-gem): Modify the version number to be passed to subsequent
>> procedures
>> * tests/gem.scm: Add tests.
>> ---
>>  guix/import/gem.scm         |  19 ++++--
>>  guix/scripts/import/gem.scm |  39 +++++++------
>>  tests/gem.scm               | 113 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 148 insertions(+), 23 deletions(-)
Taiju HIGASHI Sept. 17, 2022, 11:52 p.m. UTC | #3
Hi Chris,

Thank you for merging!

Sorry to interrupt your busy schedule at the event.
I'm watching the live streaming and enjoying the event too!

Happy Birthday,
diff mbox series

Patch

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 @@  (define-json-mapping <gem-dependency> make-gem-dependency gem-dependency?
   (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 @@  (define (make-gem-sexp name version hash home-page synopsis description
 
 (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 @@  (define* (gem-recursive-import package-name #:optional version)
   (recursive-import package-name
                     #:repo '()
                     #:repo->guix-package gem->guix-package
-                    #:guix-name ruby-package-name))
+                    #:guix-name ruby-package-name
+                    #:version version))
diff --git a/guix/scripts/import/gem.scm b/guix/scripts/import/gem.scm
index 82deac16ad..2e646e4475 100644
--- a/guix/scripts/import/gem.scm
+++ b/guix/scripts/import/gem.scm
@@ -4,6 +4,7 @@ 
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
 ;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
 ;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
+;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -31,6 +32,7 @@  (define-module (guix scripts import gem)
   #:use-module (srfi srfi-37)
   #:use-module (ice-9 match)
   #:use-module (ice-9 format)
+  #:use-module (ice-9 receive)
   #:export (guix-import-gem))
 
 
@@ -42,8 +44,9 @@  (define %default-options
   '())
 
 (define (show-help)
-  (display (G_ "Usage: guix import gem PACKAGE-NAME
-Import and convert the RubyGems package for PACKAGE-NAME.\n"))
+  (display (G_ "Usage: guix import gem PACKAGE-NAME[@VERSION]
+Import and convert the RubyGems package for PACKAGE-NAME.  Optionally, a
+version can be specified after the arobas (@) character.\n"))
   (display (G_ "
   -h, --help             display this help and exit"))
   (display (G_ "
@@ -86,21 +89,23 @@  (define (parse-options)
                              (_ #f))
                            (reverse opts))))
     (match args
-      ((package-name)
-       (let ((code (if (assoc-ref opts 'recursive)
-                       (map (match-lambda
-                              ((and ('package ('name name) . rest) pkg)
-                               `(define-public ,(string->symbol name)
-                                  ,pkg))
-                              (_ #f))
-                            (gem-recursive-import package-name 'rubygems))
-                       (let ((sexp (gem->guix-package package-name)))
-                         (if sexp sexp #f)))))
-         (match code
-           ((or #f '(#f))
-            (leave (G_ "failed to download meta-data for package '~a'~%")
-                   package-name))
-           (_ code))))
+      ((spec)
+       (receive (package-name package-version)
+           (package-name->name+version spec)
+         (let ((code (if (assoc-ref opts 'recursive)
+                         (map (match-lambda
+                                ((and ('package ('name name) . rest) pkg)
+                                 `(define-public ,(string->symbol name)
+                                    ,pkg))
+                                (_ #f))
+                              (gem-recursive-import package-name package-version))
+                         (let ((sexp (gem->guix-package package-name #:version package-version)))
+                           (if sexp sexp #f)))))
+           (match code
+             ((or #f '(#f))
+              (leave (G_ "failed to download meta-data for package '~a'~%")
+                     package-name))
+             (_ code)))))
       (()
        (leave (G_ "too few arguments~%")))
       ((many ...)
diff --git a/tests/gem.scm b/tests/gem.scm
index c8fe15398e..6aa0d279dc 100644
--- a/tests/gem.scm
+++ b/tests/gem.scm
@@ -3,6 +3,7 @@ 
 ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -44,6 +45,22 @@  (define test-foo-json
   \"licenses\": [\"MIT\", \"Apache 2.0\"]
 }")
 
+(define test-foo-v2-json
+  "{
+  \"name\": \"foo\",
+  \"version\": \"2.0.0\",
+  \"sha\": \"f3676eafca9987cb5fe263df1edf2538bf6dafc712b30e17be3543a9680547a8\",
+  \"info\": \"A cool gem\",
+  \"homepage_uri\": \"https://example.com\",
+  \"dependencies\": {
+    \"runtime\": [
+      { \"name\": \"bundler\" },
+      { \"name\": \"bar\" }
+    ]
+  },
+  \"licenses\": [\"MIT\", \"Apache 2.0\"]
+}")
+
 (define test-bar-json
   "{
   \"name\": \"bar\",
@@ -103,6 +120,35 @@  (define test-bundler-json
       (x
        (pk 'fail x #f)))))
 
+(test-assert "gem->guix-package with a specific version"
+  ;; Replace network resources with sample data.
+  (mock ((guix http-client) http-fetch
+         (lambda (url . rest)
+           (match url
+             ("https://rubygems.org/api/v2/rubygems/foo/versions/2.0.0.json"
+              (values (open-input-string test-foo-v2-json)
+                      (string-length test-foo-v2-json)))
+             (_ (error "Unexpected URL: " url)))))
+    (match (gem->guix-package "foo" #:version "2.0.0")
+      (('package
+         ('name "ruby-foo")
+         ('version "2.0.0")
+         ('source ('origin
+                    ('method 'url-fetch)
+                    ('uri ('rubygems-uri "foo" 'version))
+                    ('sha256
+                     ('base32
+                      "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
+         ('build-system 'ruby-build-system)
+         ('propagated-inputs ('list 'bundler 'ruby-bar))
+         ('synopsis "A cool gem")
+         ('description "This package provides a cool gem")
+         ('home-page "https://example.com")
+         ('license ('list 'license:expat 'license:asl2.0)))
+       #t)
+      (x
+       (pk 'fail x #f)))))
+
 (test-assert "gem-recursive-import"
   ;; Replace network resources with sample data.
   (mock ((guix http-client) http-fetch
@@ -170,4 +216,71 @@  (define test-bundler-json
           (x
            (pk 'fail x #f)))))
 
+(test-assert "gem-recursive-import with a specific version"
+  ;; Replace network resources with sample data.
+  (mock ((guix http-client) http-fetch
+         (lambda (url . rest)
+           (match url
+             ("https://rubygems.org/api/v2/rubygems/foo/versions/2.0.0.json"
+              (values (open-input-string test-foo-v2-json)
+                      (string-length test-foo-v2-json)))
+             ("https://rubygems.org/api/v1/gems/bar.json"
+              (values (open-input-string test-bar-json)
+                      (string-length test-bar-json)))
+             ("https://rubygems.org/api/v1/gems/bundler.json"
+              (values (open-input-string test-bundler-json)
+                      (string-length test-bundler-json)))
+             (_ (error "Unexpected URL: " url)))))
+        (match (gem-recursive-import "foo" "2.0.0")
+          ((('package
+              ('name "ruby-bar")
+              ('version "1.0.0")
+              ('source
+               ('origin
+                 ('method 'url-fetch)
+                 ('uri ('rubygems-uri "bar" 'version))
+                 ('sha256
+                  ('base32
+                   "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
+              ('build-system 'ruby-build-system)
+              ('propagated-inputs ('list 'bundler))
+              ('synopsis "Another cool gem")
+              ('description "Another cool gem")
+              ('home-page "https://example.com")
+              ('license #f))                      ;no licensing info
+            ('package
+              ('name "ruby-bundler")
+              ('version "1.14.2")
+              ('source
+               ('origin
+                 ('method 'url-fetch)
+                 ('uri ('rubygems-uri "bundler" 'version))
+                 ('sha256
+                  ('base32
+                   "1446xiz7zg0bz7kgx9jv84y0s4hpsg61dj5l3qb0i00avc1kxd9v"))))
+              ('build-system 'ruby-build-system)
+              ('synopsis "Ruby gem bundler")
+              ('description "Ruby gem bundler")
+              ('home-page "https://bundler.io/")
+              ('license 'license:expat))
+            ('package
+              ('name "ruby-foo")
+              ('version "2.0.0")
+              ('source
+               ('origin
+                 ('method 'url-fetch)
+                 ('uri ('rubygems-uri "foo" 'version))
+                 ('sha256
+                  ('base32
+                   "1a270mlajhrmpqbhxcqjqypnvgrq4pgixpv3w9gwp1wrrapnwrzk"))))
+              ('build-system 'ruby-build-system)
+              ('propagated-inputs ('list 'bundler 'ruby-bar))
+              ('synopsis "A cool gem")
+              ('description "This package provides a cool gem")
+              ('home-page "https://example.com")
+              ('license ('list 'license:expat 'license:asl2.0))))
+           #t)
+          (x
+           (pk 'fail x #f)))))
+
 (test-end "gem")