@matheusbsbs / matheus-bagliano / commits / afdb4c665f

apply: fix new-style empty context line triggering incomplete-line check

A new-style unified context diff represents an empty context line with an empty line (instead of a line with a single SP on it). The code to check whitespace errors in an incoming patch is designed to omit the first byte of a line (typically SP, "-", or "+") and pass the remainder of the line to the whitespace checker. Usually we do not pass a context line to the whitespace error checker, but when we are correcting errors, we do. This "remove the first byte and send the remainder" strategy of checking a line ended up sending a zero-length string to the whitespace checker when seeing a new-style empty context line, which caused the whitespace checker to say "ah, you do not even have a newline at the end!", leading to an "incomplete line" in the middle of the patch! Fix this by pretending that we got a traditional empty context line when we drive the whitespace checker. Signed-off-by: Junio C Hamano <gitster@pobox.com>

Junio C Hamano committed Mar 17, 2026 at 11:01 UTC afdb4c665f664e04c0f68c930ad50e5b05be71e1

2 files changed +26 -2

apply.c

+10 -2

@@ -1796,8 +1796,16 @@ static int parse_fragment(struct apply_state *state,

1796 trailing++;

1797 check_old_for_crlf(patch, line, len);

1798 if (!state->apply_in_reverse &&

1799 - state->ws_error_action == correct_ws_error)

1800 - check_whitespace(state, line, len, patch->ws_rule);

1799 + state->ws_error_action == correct_ws_error) {

1800 + const char *test_line = line;

1801 + int test_len = len;

1802 + if (*line == '\n') {

1803 + test_line = " \n";

1804 + test_len = 2;

1805 + }

1806 + check_whitespace(state, test_line, test_len,

1807 + patch->ws_rule);

1808 + }

1809 break;

1810 case '-':

1811 if (!state->apply_in_reverse)

t/t4124-apply-ws-rule.sh

+16

@@ -561,6 +561,22 @@ test_expect_success 'check incomplete lines (setup)' '

561 git config core.whitespace incomplete-line

562 '

563

564 +test_expect_success 'no incomplete context line (not an error)' '

565 + test_when_finished "rm -f sample*-i patch patch-new target" &&

566 + test_write_lines 1 2 3 "" 4 5 >sample-i &&

567 + test_write_lines 1 2 3 "" 0 5 >sample2-i &&

568 + cat sample-i >target &&

569 + git add target &&

570 + cat sample2-i >target &&

571 + git diff-files -p target >patch &&

572 + sed -e "s/^ $//" <patch >patch-new &&

573 +

574 + cat sample-i >target &&

575 + git apply --whitespace=fix <patch-new 2>error &&

576 + test_cmp sample2-i target &&

577 + test_must_be_empty error

578 +'

579 +

580 test_expect_success 'incomplete context line (not an error)' '

581 (test_write_lines 1 2 3 4 5 && printf 6) >sample-i &&

582 (test_write_lines 1 2 3 0 5 && printf 6) >sample2-i &&