confused by git diff --exit-code

From: Bogolisk <bogolisk@gmail.com>
Date: Oct 24, 2012, 10:33 UTC
Message-ID: <loom.20121024T122128-688@post.gmane.org>

With merge conflicts in the work-tree, diff's exit-code seems inconsistent. I thought --quiet implied --exit-code

/others/foo$ git diff --quiet /others/foo$ echo $? 1

/others/foo$ git diff --exit-code diff --cc foo.txt index f3dc283,bea67fd..0000000

--- a/foo.txt
+++ b/foo.txt
/others/foo$ echo $?
0

/others/foo$ git diff --cc --quiet
/others/foo$ echo $?
0

/others/foo$ git diff --cc --exit-code
diff --cc foo.txt
index f3dc283,bea67fd..0000000
--- a/foo.txt
+++ b/foo.txt
/others/foo$ echo $?
0