doc: Add 'SUBSTITUTE-URL' variable.

* doc/guix.texi (SUBSTITUTE-SERVER): New variable.
(Invoking guix weather): Use it.

1 files changed, 6 insertions, 5 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 6c3dc7d208..513f518926 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18,6 +18,7 @@
 
 @c The official substitute server used by default.
 @set SUBSTITUTE-SERVER ci.guix.info
+@set SUBSTITUTE-URL https://@value{SUBSTITUTE-SERVER}
 
 @copying
 Copyright @copyright{} 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès@*
@@ -10107,14 +10108,14 @@ on @var{a} and @var{a} has no substitutes, only @var{a} is listed, even though
 @var{b} usually lacks substitutes as well.  The result looks like this:
 
 @example
-$ guix weather --substitute-urls=https://ci.guix.info -c 10
+$ guix weather --substitute-urls=@value{SUBSTITUTE-URL} -c 10
 computing 8,983 package derivations for x86_64-linux...
-looking for 9,343 store items on https://ci.guix.info...
-updating substitutes from 'https://ci.guix.info'... 100.0%
-https://ci.guix.info
+looking for 9,343 store items on @value{SUBSTITUTE-URL}...
+updating substitutes from '@value{SUBSTITUTE-URL}'... 100.0%
+@value{SUBSTITUTE-URL}
   64.7% substitutes available (6,047 out of 9,343)
 @dots{}
-2502 packages are missing from 'https://ci.guix.info' for 'x86_64-linux', among which:
+2502 packages are missing from '@value{SUBSTITUTE-URL}' for 'x86_64-linux', among which:
     58  kcoreaddons@@5.49.0      /gnu/store/@dots{}-kcoreaddons-5.49.0
     46  qgpgme@@1.11.1           /gnu/store/@dots{}-qgpgme-1.11.1
     37  perl-http-cookiejar@@0.008  /gnu/store/@dots{}-perl-http-cookiejar-0.008