builtin-commit.c: fix logic to omit empty line before existing footers

"commit -s" used to add an empty line before adding S-o-b line only when
the last line of the existing log message is not another S-o-b line, but
c1e01b0 (commit: More generous accepting of RFC-2822 footer lines.,
2009-10-28) introduced logic to omit this empty line when the message ends
with a run of "footer" lines, to cover S-o-b's friends, e.g. Acked-by.

However, the logic was overzealous and missed one corner case.  A message
that consists of a single line that begins with Token + colon, it can be
mistaken as a S-o-b's friend.  We do want an empty line in such a case.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-commit.c b/builtin-commit.c
index c395cbf14f7e99880f39a63939dc174ba494004c..cfa6b06e92924484376d853eef7171d163fe7fe1 100644 (file)
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -530,7 +530,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
                        ; /* do nothing */
                if (prefixcmp(sb.buf + i, sob.buf)) {
-                       if (!ends_rfc2822_footer(&sb))
+                       if (!i || !ends_rfc2822_footer(&sb))
                                strbuf_addch(&sb, '\n');
                        strbuf_addbuf(&sb, &sob);
                }

diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
index 56cd866019dcc871e5dea684f1d879fcf2c1b884..fe94552296bb98ef78dbc51e8b1f7d4a665cf0a4 100755 (executable)
--- a/t/t7502-commit.sh
+++ b/t/t7502-commit.sh
@@ -258,4 +258,13 @@ test_expect_success 'Hand committing of a redundant merge removes dups' '
 
 '
 
+test_expect_success 'A single-liner subject with a token plus colon is not a footer' '
+
+       git reset --hard &&
+       git commit -s -m "hello: kitty" --allow-empty &&
+       git cat-file commit HEAD | sed -e "1,/^$/d" >actual &&
+       test $(wc -l <actual) = 3
+
+'
+
 test_done