[bug#33801] import: github: Support source URIs that redirect to GitHub

[Arun Isaac <arunisaac@systemreboot.net>]

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> I just realized that the warning also triggers when the URL is already a
> github.com URL:

> --8<---------------cut here---------------start------------->8---
> $ ./pre-inst-env guix lint -c github-uri stellarium
> gnu/packages/astronomy.scm:135:12: stellarium@0.18.1: URL should be 'https://github.com/Stellarium/stellarium/releases/download/v0.18.1/stellarium-0.18.1.tar.gz'
> --8<---------------cut here---------------end--------------->8---

This is a simple mistake on my part and it's not because stellarium's
origin URI redirects to the github-production-release-asset URI. Please
find attached a patch addressing this.


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From a8bc92f507e35b54afdd24a42f0aa45ff7cb2c0b Mon Sep 17 00:00:00 2001
From: Arun Isaac <arunisaac@systemreboot.net>
Date: Mon, 7 Jan 2019 23:11:58 +0530
Subject: [PATCH] guix: lint: Warn only if GitHub URI is not same as the
 package URI.

* guix/scripts/lint.scm (check-github-url): Warn only if the GitHub URI
obtained after following redirects is not same as the original URI.
---
 guix/scripts/lint.scm | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/guix/scripts/lint.scm b/guix/scripts/lint.scm
index 9acec4857..0f315a935 100644
--- a/guix/scripts/lint.scm
+++ b/guix/scripts/lint.scm
@@ -8,7 +8,7 @@
 ;;; Copyright © 2017 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2017, 2018 Efraim Flashner <efraim@flashner.co.il>
-;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2018, 2019 Arun Isaac <arunisaac@systemreboot.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -820,10 +820,11 @@ descriptions maintained upstream."
        (lambda (uri)
          (and=> (follow-redirects-to-github uri)
                 (lambda (github-uri)
-                  (emit-warning
-                   package
-                   (format #f (G_ "URL should be '~a'") github-uri)
-                   'source))))
+                  (unless (string=? github-uri uri)
+                    (emit-warning
+                     package
+                     (format #f (G_ "URL should be '~a'") github-uri)
+                     'source)))))
        (origin-uris origin)))))
 
 (define (check-derivation package)
-- 
2.19.2


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