[bug#42868] [PATCH] maint: Only run `make authenticate` when pushing commits.

[Leo Famulari <leo@famulari.name>]

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On Sun, Aug 30, 2020 at 09:47:59PM +0200, Ludovic Courtès wrote:
> Hi,
> 
> Leo Famulari <leo@famulari.name> skribis:
> 
> > When deleting a remote branch, no commits are pushed to the remote, and
> > thus there are no signatures to be verified.
> >
> > * etc/git/pre-push: Exit early when deleting a branch.
> 
> I agree with Jakub regarding the ‘if’ :-), but other than that it LGTM.

The previous version of this patch was untested and broken!

Here is a new one that is actually tested and working.

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From e8546a590a560825c3231af14724329c3d2bfee7 Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Fri, 14 Aug 2020 16:30:47 -0400
Subject: [PATCH] maint: Only run `make authenticate` when pushing commits.

* etc/git/pre-push: Exit early when deleting a branch.
---
 etc/git/pre-push | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/etc/git/pre-push b/etc/git/pre-push
index 415345fc75..59671b0d58 100755
--- a/etc/git/pre-push
+++ b/etc/git/pre-push
@@ -20,13 +20,26 @@
 #
 #   <local ref> <local sha1> <remote ref> <remote sha1>
 
-# Only use the hook when pushing to Savannah.
-case "$2" in
-    *.gnu.org*)
-	exec make authenticate check-channel-news
-	exit 127
-	;;
-    *)
-	exit 0
-	;;
-esac
+# This is the "empty hash" used by Git when pushing a branch deletion.
+z40=0000000000000000000000000000000000000000
+
+while read local_ref local_hash remote_ref remote_hash
+do
+	# When deleting a remote branch, no commits are pushed to the remote, and
+	# thus there are no signatures to be verified.
+	if [ "$local_hash" != $z40 ]
+	then
+		# Only use the hook when pushing to Savannah.
+		case "$2" in
+		    *.gnu.org*)
+			exec make authenticate check-channel-news
+			exit 127
+			;;
+		    *)
+			exit 0
+			;;
+		esac
+	fi
+done
+
+exit 0
-- 
2.29.2


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