Merge branch 'jk/filter-branch-use-of-sed-on-incomplete-line' into maint

"filter-branch" corrupted commit log message that ends with an
incomplete line on platforms with some "sed" implementations that
munge such a line.  Work it around by avoiding to use "sed".

* jk/filter-branch-use-of-sed-on-incomplete-line:
  filter-branch: avoid passing commit message through sed

Author: gitster

git-filter-branch.sh

@@ -346,7 +346,15 @@ while read commit parents; do
 				die "parent filter failed: $filter_parent"
 	fi
 
-	sed -e '1,/^$/d' <../commit | \
+	{
+		while read -r header_line && test -n "$header_line"
+		do
+			# skip header lines...
+			:;
+		done
+		# and output the actual commit message
+		cat
+	} <../commit |
 		eval "$filter_msg" > ../message ||
 			die "msg filter failed: $filter_msg"
 	workdir=$workdir @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \

t/t7003-filter-branch.sh

@@ -394,4 +394,14 @@ test_expect_success 'replace submodule revision' '
 	test $orig_head != `git show-ref --hash --head HEAD`
 '
 
+test_expect_success 'filter commit message without trailing newline' '
+	git reset --hard original &&
+	commit=$(printf "no newline" | git commit-tree HEAD^{tree}) &&
+	git update-ref refs/heads/no-newline $commit &&
+	git filter-branch -f refs/heads/no-newline &&
+	echo $commit >expect &&
+	git rev-parse refs/heads/no-newline >actual &&
+	test_cmp expect actual
+'
+
 test_done