lint: Add 'check-haskell-stackage' checker.

* guix/lint.scm (check-haskell-stackage): New procedure.
(%network-dependent-checkers): Add 'haskell-stackage' checker.
* guix/import/hackage.scm (%hackage-url): New variable.
(hackage-source-url, hackage-cabal-url): Use it in place of a
hard-coded string.
* guix/import/stackage.scm (%stackage-url): Make it a parameter.
(stackage-lts-info-fetch): Update accordingly.
* tests/lint.scm ("hackage-stackage"): New test.

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/lint.scm b/tests/lint.scm
index bd052842f3..9b230814a5 100644
--- a/tests/lint.scm
+++ b/tests/lint.scm
@@ -7,6 +7,7 @@
 ;;; Copyright © 2017 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018, 2019 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2020 Timothy Sample <samplet@ngyro.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -38,6 +39,8 @@
   #:use-module (guix swh)
   #:use-module ((guix gexp) #:select (local-file))
   #:use-module ((guix utils) #:select (call-with-temporary-directory))
+  #:use-module ((guix import hackage) #:select (%hackage-url))
+  #:use-module ((guix import stackage) #:select (%stackage-url))
   #:use-module (gnu packages)
   #:use-module (gnu packages glib)
   #:use-module (gnu packages pkg-config)
@@ -1057,6 +1060,35 @@
     (string-contains (single-lint-warning-message warnings)
                      "rate limit reached")))
 
+(test-skip (if (http-server-can-listen?) 0 1))
+(test-assert "haskell-stackage"
+  (let* ((stackage (string-append "{ \"packages\": [{"
+                                  "    \"name\":\"x\","
+                                  "    \"version\":\"1.0\" }]}"))
+         (packages (map (lambda (version)
+                          (dummy-package
+                           (string-append "ghc-x")
+                           (version version)
+                           (source
+                            (dummy-origin
+                             (method url-fetch)
+                             (uri (string-append
+                                   "https://hackage.haskell.org/package/"
+                                   "x-" version "/x-" version ".tar.gz"))))))
+                        '("0.9" "1.0" "2.0")))
+         (warnings (pk (with-http-server `((200 ,stackage) ; memoized
+                                           (200 "name: x\nversion: 1.0\n")
+                                           (200 "name: x\nversion: 1.0\n")
+                                           (200 "name: x\nversion: 1.0\n"))
+                         (parameterize ((%hackage-url (%local-url))
+                                        (%stackage-url (%local-url)))
+                           (append-map check-haskell-stackage packages))))))
+    (match warnings
+      (((? lint-warning? warning))
+       (and (string=? (package-version (lint-warning-package warning)) "2.0")
+            (string-contains (lint-warning-message warning)
+                             "ahead of Stackage LTS version"))))))
+
 (test-end "lint")
 
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