[bug#46956] PATCH] doc: Add information about mirrors.

[raid5atemyhomework]

As requested by Xinglu.

Also the original patch has bitrotted and no longer apply to latest master, 
fixed that as well.

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>From 9eeeeb888c3cdd1a788d2a2646c1baf4cd0d7c09 Mon Sep 17 00:00:00 2001
From: raid5atemyhomework <raid5atemyhomework@protonmail.com>
Date: Tue, 10 Aug 2021 19:52:31 +0800
Subject: [PATCH] [PATCH] doc: Add information about mirrors.

* doc.texi (Getting Substitutes from Other Servers): Add a list of
mirror substitute servers.
(Using a Custom Guix Channel): Add a list of mirror Guix repositories.
---
 doc/guix.texi | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 4eb5324b51..031ec782e1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -94,6 +94,7 @@ Copyright @copyright{} 2021 Xinglu Chen@*
 Copyright @copyright{} 2021 Raghav Gururajan@*
 Copyright @copyright{} 2021 Domagoj Stolfa@*
 Copyright @copyright{} 2021 Hui Lu@*
+Copyright @copyright{} 2021 raid5atemyhomework@*

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -3902,6 +3903,20 @@ can list as many substitute servers as you like, with 
the caveat that
 substitute lookup can be slowed down if too many servers need to be
 contacted.

+Below is a list of available substitute servers for the Guix distribution
+channel; you can add a mirror that is nearer to you if you find that the
+official Guix substitute server is slow:
+
+@itemize
+@item @code{https://mirror.sjtu.edu.cn/guix} - China, SJTU.
+@item @code{https://ci.guix.gnu.org} - Germany, official Guix server.
+You should always add this as a substitute URL as a fallback.
+@item @code{https://bordeaux.guix.gnu.org} - France, official Guix
+server.  You should always add this as a substitute URL as a
+fallback.
+@end itemize
+
+
 Note that there are also situations where one may want to add the URL of
 a substitute server @emph{without} authorizing its key.
 @xref{Substitute Authentication}, to understand this fine point.
@@ -5095,6 +5110,19 @@ From there on, @command{guix pull} will fetch code from 
the @code{super-hacks}
 branch of the repository at @code{example.org}.  The authentication concern is
 addressed below ((@pxref{Channel  Authentication}).

+Below is a list of available mirrors of the @code{guix} repository; you can
+replace the @code{guix} channel with one that is nearer to you if you find
+that the official @code{guix} repository is slow:
+
+@itemize
+@item @code{https://git.savannah.gnu.org/git/guix.git} branch @code{master}
+- USA, Official Guix.
+@item @code{https://github.com/guix-mirror/guix} branch @code{master}
+- USA, unofficial mirror.
+@item @code{https://mirror.sjtu.edu.cn/git/guix.git} branch @code{master}
+- China, SJTU, not available over TOR.
+@end itemize
+
 @node Replicating Guix
 @section Replicating Guix

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2.32.0