Re: git diff returns fatal error with core.safecrlf is set to true.

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> Care to turn it into an appliable patch with tests?

In the meantime, here is a quick-and-dirty one.  I am not proud of
it; it was just something to keep in 'pu' let it gets lost.

A better replacement is very much welcomed.

-- >8 --
Subject: [PATCH] diff: demote core.safecrlf=true to core.safecrlf=warn

Otherwise the user will not be able to start to guess where in the
contents in the working tree the offending unsafe CR lies.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 diff.c          | 6 +++++-
 t/t0020-crlf.sh | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index 32142db..155857c 100644
--- a/diff.c
+++ b/diff.c
@@ -2647,6 +2647,10 @@ static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
 int diff_populate_filespec(struct diff_filespec *s, int size_only)
 {
 	int err = 0;
+	enum safe_crlf crlf_warn = (safe_crlf != SAFE_CRLF_FAIL
+				    ? safe_crlf
+				    : SAFE_CRLF_WARN);
+
 	if (!DIFF_FILE_VALID(s))
 		die("internal error: asking to populate invalid file.");
 	if (S_ISDIR(s->mode))
@@ -2702,7 +2706,7 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
 		/*
 		 * Convert from working tree format to canonical git format
 		 */
-		if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
+		if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
 			size_t size = 0;
 			munmap(s->data, s->size);
 			s->should_munmap = 0;
diff --git a/t/t0020-crlf.sh b/t/t0020-crlf.sh
index 1a8f44c..e526184 100755
--- a/t/t0020-crlf.sh
+++ b/t/t0020-crlf.sh
@@ -81,6 +81,14 @@ test_expect_success 'safecrlf: print warning only once' '
 	test $(git add doublewarn 2>&1 | grep "CRLF will be replaced by LF" | wc -l) = 1
 '
 
+
+test_expect_success 'safecrlf: git diff demotes safecrlf=true to warn' '
+	git config core.autocrlf input &&
+	git config core.safecrlf true &&
+	git diff HEAD
+'
+
+
 test_expect_success 'switch off autocrlf, safecrlf, reset HEAD' '
 	git config core.autocrlf false &&
 	git config core.safecrlf false &&
-- 
1.8.3.1-771-gb7c3f25