Merge branch 'jt/use-trailer-api-in-commands' into maint

"git cherry-pick" and other uses of the sequencer machinery
mishandled a trailer block whose last line is an incomplete line.
This has been fixed so that an additional sign-off etc. are added
after completing the existing incomplete line.

* jt/use-trailer-api-in-commands:
  sequencer: add newline before adding footers

sequencer.c

@@ -1045,6 +1045,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 			strbuf_addstr(&msgbuf, p);
 
 		if (opts->record_origin) {
+			strbuf_complete_line(&msgbuf);
 			if (!has_conforming_footer(&msgbuf, NULL, 0))
 				strbuf_addch(&msgbuf, '\n');
 			strbuf_addstr(&msgbuf, cherry_picked_prefix);
@@ -2360,6 +2361,9 @@ void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
 				getenv("GIT_COMMITTER_EMAIL")));
 	strbuf_addch(&sob, '\n');
 
+	if (!ignore_footer)
+		strbuf_complete_line(msgbuf);
+
 	/*
 	 * If the whole message buffer is equal to the sob, pretend that we
 	 * found a conforming footer with a matching sob
@@ -2380,13 +2384,6 @@ void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
 			 * the title and body to be filled in by the user.
 			 */
 			append_newlines = "\n\n";
-		} else if (msgbuf->buf[len - 1] != '\n') {
-			/*
-			 * Incomplete line.  Complete the line and add a
-			 * blank one so that there is an empty line between
-			 * the message body and the sob.
-			 */
-			append_newlines = "\n\n";
 		} else if (len == 1) {
 			/*
 			 * Buffer contains a single newline.  Add another

t/t3511-cherry-pick-x.sh

@@ -208,6 +208,50 @@ test_expect_success 'cherry-pick -x -s adds sob even when trailing sob exists fo
 	test_cmp expect actual
 '
 
+test_expect_success 'cherry-pick -x handles commits with no NL at end of message' '
+	pristine_detach initial &&
+	printf "title\n\nSigned-off-by: A <a@example.com>" >msg &&
+	sha1=$(git commit-tree -p initial mesg-with-footer^{tree} <msg) &&
+	git cherry-pick -x $sha1 &&
+	git log -1 --pretty=format:%B >actual &&
+
+	printf "\n(cherry picked from commit %s)\n" $sha1 >>msg &&
+	test_cmp msg actual
+'
+
+test_expect_success 'cherry-pick -x handles commits with no footer and no NL at end of message' '
+	pristine_detach initial &&
+	printf "title\n\nnot a footer" >msg &&
+	sha1=$(git commit-tree -p initial mesg-with-footer^{tree} <msg) &&
+	git cherry-pick -x $sha1 &&
+	git log -1 --pretty=format:%B >actual &&
+
+	printf "\n\n(cherry picked from commit %s)\n" $sha1 >>msg &&
+	test_cmp msg actual
+'
+
+test_expect_success 'cherry-pick -s handles commits with no NL at end of message' '
+	pristine_detach initial &&
+	printf "title\n\nSigned-off-by: A <a@example.com>" >msg &&
+	sha1=$(git commit-tree -p initial mesg-with-footer^{tree} <msg) &&
+	git cherry-pick -s $sha1 &&
+	git log -1 --pretty=format:%B >actual &&
+
+	printf "\nSigned-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>\n" >>msg &&
+	test_cmp msg actual
+'
+
+test_expect_success 'cherry-pick -s handles commits with no footer and no NL at end of message' '
+	pristine_detach initial &&
+	printf "title\n\nnot a footer" >msg &&
+	sha1=$(git commit-tree -p initial mesg-with-footer^{tree} <msg) &&
+	git cherry-pick -s $sha1 &&
+	git log -1 --pretty=format:%B >actual &&
+
+	printf "\n\nSigned-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>\n" >>msg &&
+	test_cmp msg actual
+'
+
 test_expect_success 'cherry-pick -x treats "(cherry picked from..." line as part of footer' '
 	pristine_detach initial &&
 	sha1=$(git rev-parse mesg-with-cherry-footer^0) &&