Don't require traditional patch header after "git --diff"

Reported by Tim Waugh <twaugh@redhat.com>.
* src/pch.c (intuit_diff_type): Don't require a traditional patch header
("--- old\n+++ new/n") after a "git --diff" header; the "git --diff" header
gives us enough information for being able to process subsequent hunks.  This
deals with corrupted patches more gracefully.
* tests/corrupt-patch: New test case.
* tests/Makefile.am (TESTS): Add test case.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/pch.c b/src/pch.c
index 9d74471..84adba1 100644
--- a/src/pch.c
+++ b/src/pch.c
@@ -622,6 +622,7 @@ intuit_diff_type (bool need_header, mode_t *p_file_type)
 		  p_name[i] = 0;
 		}
 	    p_git_diff = true;
+	    need_header = false;
 	  }
 	else if (p_git_diff && strnEQ (s, "index ", 6))
 	  {