Merge branch 'jk/maint-null-in-trees' into maint-1.7.11

"git diff" had a confusion between taking data from a path in the
working tree and taking data from an object that happens to have
name 0{40} recorded in a tree.

* jk/maint-null-in-trees:
  fsck: detect null sha1 in tree entries
  do not write null sha1s to on-disk index
  diff: do not use null sha1 as a sentinel value

1 files changed, 5 insertions, 0 deletions

diff --git a/diff.h b/diff.h
index e027650cb0..815dd7af57 100644
--- a/diff.h
+++ b/diff.h
@@ -19,12 +19,14 @@ typedef void (*change_fn_t)(struct diff_options *options,
 		 unsigned old_mode, unsigned new_mode,
 		 const unsigned char *old_sha1,
 		 const unsigned char *new_sha1,
+		 int old_sha1_valid, int new_sha1_valid,
 		 const char *fullpath,
 		 unsigned old_dirty_submodule, unsigned new_dirty_submodule);
 
 typedef void (*add_remove_fn_t)(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const unsigned char *sha1,
+		    int sha1_valid,
 		    const char *fullpath, unsigned dirty_submodule);
 
 typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
@@ -214,12 +216,15 @@ extern void diff_addremove(struct diff_options *,
 			   int addremove,
 			   unsigned mode,
 			   const unsigned char *sha1,
+			   int sha1_valid,
 			   const char *fullpath, unsigned dirty_submodule);
 
 extern void diff_change(struct diff_options *,
 			unsigned mode1, unsigned mode2,
 			const unsigned char *sha1,
 			const unsigned char *sha2,
+			int sha1_valid,
+			int sha2_valid,
 			const char *fullpath,
 			unsigned dirty_submodule1, unsigned dirty_submodule2);