[bug#28699] [PATCH] pull: Add GUIX_PULL_URL environment variable.

[Oleg Pykhalov <go.wigust@gmail.com>]

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From 2638c08eef0e8c173111ced6bbc95167f6130fd7 Mon Sep 17 00:00:00 2001
From: Oleg Pykhalov <go.wigust@gmail.com>
Date: Wed, 4 Oct 2017 12:01:41 +0300
Subject: [PATCH] pull: Add GUIX_PULL_URL environment variable.

* guix/scripts/pull.scm (%repository-url): Add GUIX_PULL_URL environment
  variable.
* doc/guix.texi (Invoking guix pull): Mention GUIX_PULL_URL.
---
 doc/guix.texi         | 3 ++-
 guix/scripts/pull.scm | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index f0a59a6b4..0b6d5cdee 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -2533,7 +2533,8 @@ Produce verbose output, writing build logs to the standard error output.
 Download Guix from the Git repository at @var{url}.
 
 By default, the source is taken from its canonical Git repository at
-@code{gnu.org}, for the stable branch of Guix.
+@code{gnu.org}, for the stable branch of Guix.  To use a different source,
+provide @code{GUIX_PULL_URL} environment variable.
 
 @item --commit=@var{commit}
 Deploy @var{commit}, a valid Git commit ID represented as a hexadecimal
diff --git a/guix/scripts/pull.scm b/guix/scripts/pull.scm
index b1c87c870..240019800 100644
--- a/guix/scripts/pull.scm
+++ b/guix/scripts/pull.scm
@@ -82,7 +82,7 @@ Install it by running:
                (resolve-interface '(git))))
 
 (define %repository-url
-  "https://git.savannah.gnu.org/git/guix.git")
+  (or (getenv "GUIX_PULL_URL") "https://git.savannah.gnu.org/git/guix.git"))
 
 \f
 ;;;
-- 
2.14.2