[PATCH] Fix 'git am' in-body header continuations

[Linus Torvalds <torvalds@linux-foundation.org>]

From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 1 Apr 2017 12:14:39 -0700
Subject: [PATCH] Fix 'git am' in-body header continuations

An empty line should stop any pending in-body headers, and start the
actual body parsing.

This also modifies the original test for the in-body headers to actually
have a real commit body that starts with spaces, and changes the test to
check that the long line matches _exactly_, and doesn't get extra data
from the body.

Fixes:6b4b013f1884 ("mailinfo: handle in-body header continuations")
Cc: Jonathan Tan <jonathantanmy@google.com>
Cc: Jeff King <peff@peff.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

On Sun, 2 Apr 2017, Junio C Hamano wrote:
> 
> And that is exactly your patch does.  The change "feels" correct to
> me.

Ok, resent with the test-case for the original behavior changed to be 
stricter (so it fails without this fix), and with Signed-off lines etc.

I didn't really test the test-case very much, but it seemed to fail 
without this patch (because the "Body test" thing from the body becomes 
part of the long first line), and passes with it.

But somebody who is more used to the test-suite should double-check my 
stupid test edit.

 mailinfo.c    | 7 ++++++-
 t/t4150-am.sh | 6 ++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/mailinfo.c b/mailinfo.c
index a489d9d0f..68037758f 100644
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -757,8 +757,13 @@ static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
 	assert(!mi->filter_stage);
 
 	if (mi->header_stage) {
-		if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
+		if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
+			if (mi->inbody_header_accum.len) {
+				flush_inbody_header_accum(mi);
+				mi->header_stage = 0;
+			}
 			return 0;
+		}
 	}
 
 	if (mi->use_inbody_headers && mi->header_stage) {
diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 89a5bacac..44807e218 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -983,7 +983,9 @@ test_expect_success 'am works with multi-line in-body headers' '
 	rm -fr .git/rebase-apply &&
 	git checkout -f first &&
 	echo one >> file &&
-	git commit -am "$LONG" --author="$LONG <long@example.com>" &&
+	git commit -am "$LONG
+
+    Body test" --author="$LONG <long@example.com>" &&
 	git format-patch --stdout -1 >patch &&
 	# bump from, date, and subject down to in-body header
 	perl -lpe "
@@ -997,7 +999,7 @@ test_expect_success 'am works with multi-line in-body headers' '
 	git am msg &&
 	# Ensure that the author and full message are present
 	git cat-file commit HEAD | grep "^author.*long@example.com" &&
-	git cat-file commit HEAD | grep "^$LONG"
+	git cat-file commit HEAD | grep "^$LONG$"
 '
 
 test_done
-- 
2.12.2.578.g5c4e54f4e