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[bug#42048] [PATCH 3/6] channels: Remove 'signature' from <channel-intro

From: Ludovic Courtès
Subject: [bug#42048] [PATCH 3/6] channels: Remove 'signature' from <channel-introduction>.
Date: Thu, 25 Jun 2020 23:16:02 +0200

In the end signing the commit/key pair does not buy us much.  Someone
publishing a valid but different commit/key pair would effectively be
publishing a different channel, which could be a fork (made by a former
authorized developer) or simply a mirror.  In the latter case, there's
nothing to be gained by publishing a different commit/key pair.

* guix/channels.scm (<channel-introduction>)[signature]: Remove.
(make-channel-introduction): Adjust accordingly.
 guix/channels.scm | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/guix/channels.scm b/guix/channels.scm
index 9859bfdda8..05b2661445 100644
--- a/guix/channels.scm
+++ b/guix/channels.scm
@@ -128,22 +128,19 @@
 ;; Channel introductions.  A "channel introduction" provides a commit/signer
 ;; pair that specifies the first commit of the authentication process as well
-;; as its signer's fingerprint.  The pair must be signed by the signer of that
-;; commit so that only them may emit this introduction.  Introductions are
-;; used to bootstrap trust in a channel.
+;; as its signer's fingerprint.  Introductions are used to bootstrap trust in
+;; a channel.
 (define-record-type <channel-introduction>
-  (%make-channel-introduction first-signed-commit first-commit-signer
-                              signature)
+  (%make-channel-introduction first-signed-commit first-commit-signer)
-  (first-signed-commit  channel-introduction-first-signed-commit) ;hex string
-  (first-commit-signer  channel-introduction-first-commit-signer) ;bytevector
-  (signature            channel-introduction-signature))          ;string
+  (first-signed-commit  channel-introduction-first-signed-commit)  ;hex string
+  (first-commit-signer  channel-introduction-first-commit-signer)) ;bytevector
 (define (make-channel-introduction commit signer)
   "Return a new channel introduction: COMMIT is the introductory where
 authentication starts, and SIGNER is the OpenPGP fingerprint (a bytevector) of
 the signer of that commit."
-  (%make-channel-introduction commit signer #f))
+  (%make-channel-introduction commit signer))
 (define (openpgp-fingerprint->bytevector str)
   "Convert STR, an OpenPGP fingerprint (hexadecimal string with whitespace),

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