From 423f5265f3ede96f4640b0c4f2048acc838e8401 Mon Sep 17 00:00:00 2001
From: Stephen Haberman <stephen@exigencecorp.com>
Date: Wed, 23 Jul 2008 17:36:09 -0500
Subject: [PATCH] Don't let merge commits fool the prefer-rebase script.

---
 server/update-prefer-rebase                   |  3 +-
 ...ver-update-prefer-rebase-even-if-merges.sh | 66 +++++++++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 tests/t2301-server-update-prefer-rebase-even-if-merges.sh

diff --git a/server/update-prefer-rebase b/server/update-prefer-rebase
index 7dc1ef8..79c3bef 100644
--- a/server/update-prefer-rebase
+++ b/server/update-prefer-rebase
@@ -56,7 +56,8 @@ git rev-parse --not --branches | git rev-list --stdin $oldrev..$newrev | while r
 
 		# For each parent
 		git rev-list -n 1 --parents $commit | sed 's/ /\n/g' | grep -v $commit | while read parent ; do
-			all_commits=$(git rev-list $baserev..$parent | wc -l)
+			echo "looking at $baserev..$parent for $commit"
+			all_commits=$(git rev-list --first-parent $baserev..$parent | wc -l)
 			new_commits=$(git rev-parse --not --branches | git rev-list --stdin $baserev..$parent | wc -l)
 			if [[ $all_commits -eq $new_commits ]] ; then
 				echo "----------------------------------------------------"
diff --git a/tests/t2301-server-update-prefer-rebase-even-if-merges.sh b/tests/t2301-server-update-prefer-rebase-even-if-merges.sh
new file mode 100644
index 0000000..1f3cb20
--- /dev/null
+++ b/tests/t2301-server-update-prefer-rebase-even-if-merges.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+test_description='server update prefer rebase (with incoming merges)'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo "setup" >a &&
+	git add a &&
+	git commit -m "setup" &&
+	git clone ./. server &&
+	rm -fr server/.git/hooks &&
+	git remote add origin ./server &&
+	git config --add branch.master.remote origin &&
+	git config --add branch.master.merge refs/heads/master &&
+	git fetch &&
+
+	# Specifically, setup a stable that we will merge and check for rebase
+	git checkout -b stable master &&
+	echo "setup.stable" >a &&
+	git commit -a -m "stable" &&
+	git push origin stable
+'
+
+install_server_hook 'update-prefer-rebase' 'update'
+
+test_expect_success 'merging in stable does not fool the script' '
+	# start our branch, and share it
+	git checkout -b topic1 stable &&
+	git config --add branch.topic1.remote origin &&
+	git config --add branch.topic1.merge refs/heads/topic1 &&
+	echo "topic1" >a.topic1 &&
+	git add a.topic1 &&
+	git commit -m "topic1" &&
+	git push origin topic1 &&
+
+	# now, separately, move ahead stable, and share it
+	git checkout stable
+	echo "setup.stable.moved" >a &&
+	git commit -a -m "stable moved" &&
+	git push origin stable &&
+
+	# have another client commit (in this case, it is the server, but close enough) move topic1
+	cd server &&
+	git checkout topic1 &&
+	echo "$test_name" >a.client2 &&
+	git add a.client2 &&
+	git commit -m "topic1 changed by client2" &&
+	cd .. &&
+
+	# now locally try and merge in stable (even though we are out of date)
+	git checkout topic1 &&
+	git merge stable &&
+
+	# We are shutdown for being a rewind
+	! git push 2>push.err &&
+	cat push.err | grep "[rejected]        topic1 -> topic1 (non-fast forward)"
+
+	# Make a new merge commit
+	git pull &&
+	! git push 2>push.err &&
+	cat push.err | grep "It looks like you should rebase instead of merging"
+'
+
+test_done
+
-- 
2.39.5