[PATCH v1 1/1] correct apply for files commited with CRLF

[tboegi@web.de]

From: Torsten Bögershausen <tboegi@web.de>

git apply does not find the source lines when files have CRLF in the index
and core.autocrlf is true:
These files should not get the CRLF converted to LF. Because cmd_apply()
does not load the index, this does not work, CRLF are converted into LF
and apply fails.

Fix this in the spirit of commit a08feb8ef0b6,
"correct blame for files commited with CRLF" by loading the index.

As an optimization, skip read_cache() when no conversion is specified
for this path.

Reported-by: Anthony Sottile <asottile@umich.edu>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
---
 apply.c         |  2 ++
 t/t0020-crlf.sh | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/apply.c b/apply.c
index f2d599141d..66b8387360 100644
--- a/apply.c
+++ b/apply.c
@@ -2278,6 +2278,8 @@ static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
 	case S_IFREG:
 		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
 			return error(_("unable to open or read %s"), path);
+		if (would_convert_to_git(&the_index, path))
+			read_cache();
 		convert_to_git(&the_index, path, buf->buf, buf->len, buf, 0);
 		return 0;
 	default:
diff --git a/t/t0020-crlf.sh b/t/t0020-crlf.sh
index 71350e0657..6611f8a6f6 100755
--- a/t/t0020-crlf.sh
+++ b/t/t0020-crlf.sh
@@ -386,4 +386,16 @@ test_expect_success 'New CRLF file gets LF in repo' '
 	test_cmp alllf alllf2
 '
 
+test_expect_success 'CRLF in repo, apply with autocrlf=true' '
+	git config core.autocrlf false &&
+	printf "1\r\n2\r\n" >crlf &&
+	git add crlf &&
+	git commit -m "commit crlf with crlf" &&
+	git config core.autocrlf true &&
+	printf "1\r\n2\r\n\r\n\r\n\r\n" >crlf &&
+	git diff >patch &&
+	git checkout -- . &&
+	git apply patch
+'
+
 test_done
-- 
2.13.2.533.ge0aaa1b