From 8b4e2f2218b4e9461e36d7e6cc7b68c4765a951f Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 29 Jun 2026 09:28:18 -0700
Subject: [PATCH] update-from-lore: automate updating from mailing list

When on branch T, detach the HEAD at the base of the branch, and
find the newest iteration of the same topic from lore, apply the
patches, and show the range-diff from what we have.

Depends on having healty "amlog" notes to allow us identify what
patch message resulted in the commit T, and working "b4 am" and the
lore archive that lets us grab the latest iteration.
---
 update-from-lore.sh | 52 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 update-from-lore.sh

diff --git a/update-from-lore.sh b/update-from-lore.sh
new file mode 100755
index 0000000000..73b24fd286
--- /dev/null
+++ b/update-from-lore.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+force=
+while case "$#" in 0) break;; esac
+do
+	case "$1" in
+	-f | --force)
+		force=force ;;
+	-*)
+		echo >&2 "$0: unknown option '$1'"
+		exit 1 ;;
+	*)
+		break ;;
+	esac
+	shift
+done
+
+case "$#" in
+0)	: happy ;;
+*)	echo >&2 "$0: extra arguments" ;;
+esac
+
+above_master=$(git rev-list --first-parent master.. | wc -l)
+above_next=$(git rev-list --first-parent next.. | wc -l)
+if test "$above_master" != "$above_next"
+then
+	if test "$force" = force
+	then
+		echo >&2 warning: some patches are already in next
+	else
+		echo >&2 fatal: some patches are already in next
+		exit 1
+	fi
+fi
+
+MID=
+OLD=$(git rev-parse HEAD)
+git detach || exit
+git rev-list HEAD..$OLD |
+while read commit
+do
+	git notes --ref=amlog show $commit
+done |
+sed -n -e '/^Message-Id: /{
+	s///p
+	q
+}' |
+xargs -n1 b4 am -o- -T |
+tee ./+b4am.mbx |
+git am -s3 && rm -f ./+b4am.mbx &&
+
+git range-diff --notes=amlog --crea=999 @{-1}...