[bug#60630] [PATCH] guix: channels: Add description field.

[jgart]

* guix/channels.scm (<channel>): Add channel description field and
comment disambiguating the type expected in an introduction field.
* doc/guix.scm (Invoking guix describe): Add channel description field
to channels record instance example.

This commit adds an optional description field to a channel intended to
describe the channel. Its purpose is similar to the description field
in a <package> record.
---
 doc/guix.texi     |  2 ++
 guix/channels.scm | 15 ++++++++-------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 24d99cbf24..483d2fbaa4 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5063,6 +5063,8 @@ $ guix describe -f channels
 (list (channel
         (name 'guix)
         (url "https://git.savannah.gnu.org/git/guix.git";)
+        (description "The main GNU Guix channel providing the core
+package collection along with Guix and its documentation.")
         (commit
           "e0fa68c7718fffd33d81af415279d6ddb518f727")
         (introduction
diff --git a/guix/channels.scm b/guix/channels.scm
index d84228c47e..8acf3d8742 100644
--- a/guix/channels.scm
+++ b/guix/channels.scm
@@ -122,13 +122,14 @@ (define-module (guix channels)
 
 (define-record-type* <channel> channel make-channel
   channel?
-  (name      channel-name)
-  (url       channel-url)
-  (branch    channel-branch (default "master"))
-  (commit    channel-commit (default #f))
-  (introduction channel-introduction (default #f))
-  (location  channel-location
-             (default (current-source-location)) (innate)))
+  (name              channel-name)
+  (url               channel-url)
+  (description       channel-description (default #f)) ; string
+  (branch            channel-branch (default "master"))
+  (commit            channel-commit (default #f))
+  (introduction      channel-introduction (default #f)) ; 
<channel-introduction>
+  (location          channel-location
+                     (default (current-source-location)) (innate)))
 
 ;; Channel introductions.  A "channel introduction" provides a commit/signer
 ;; pair that specifies the first commit of the authentication process as well
-- 
2.38.1