Re: [PATCH] diff.c: output correct index lines for a split diff

[Jeff King <peff@peff.net>]

On Mon, Jan 26, 2009 at 12:33:56AM -0800, Junio C Hamano wrote:

> This moves the code to generate metainfo lines around, so that two
> independent sets of metainfo lines are used for the split halves.

The patch and the generated output look correct to me, so

Acked-by: Jeff King <peff@peff.net>

> I did not include your new test script here; perhaps we can add it to an
> existing typechange diff/apply test, like t4114?

I think it makes sense to add to t4114. Please squash in the test below.

One think to note, though: test 8 (binary -> symlink) shows breakage
with the current master, but test 9 (symlink -> binary) does not.
However, if you run the test under "-d" you can see that the diff has
bogus metainfo. It's just that "apply" doesn't care.

Your test fixes the test failure, and I verified manually that the diff
output is sensible. I don't think an additional test is worth it, but we
could add one that explicitly checks the metainfo if you want to be
extra paranoid.

---
diff --git a/t/t4114-apply-typechange.sh b/t/t4114-apply-typechange.sh
index 5533492..0f185ca 100755
--- a/t/t4114-apply-typechange.sh
+++ b/t/t4114-apply-typechange.sh
@@ -25,6 +25,10 @@ test_expect_success 'setup repository and commits' '
 	git update-index foo &&
 	git commit -m "foo back to file" &&
 	git branch foo-back-to-file &&
+	printf "\0" > foo &&
+	git update-index foo &&
+	git commit -m "foo becomes binary" &&
+	git branch foo-becomes-binary &&
 	rm -f foo &&
 	git update-index --remove foo &&
 	mkdir foo &&
@@ -85,6 +89,20 @@ test_expect_success 'symlink becomes file' '
 	'
 test_debug 'cat patch'
 
+test_expect_success 'binary file becomes symlink' '
+	git checkout -f foo-becomes-binary &&
+	git diff-tree -p --binary HEAD foo-symlinked-to-bar > patch &&
+	git apply --index < patch
+	'
+test_debug 'cat patch'
+
+test_expect_success 'symlink becomes binary file' '
+	git checkout -f foo-symlinked-to-bar &&
+	git diff-tree -p --binary HEAD foo-becomes-binary > patch &&
+	git apply --index < patch
+	'
+test_debug 'cat patch'
+
 
 test_expect_success 'symlink becomes directory' '
 	git checkout -f foo-symlinked-to-bar &&