Hi,

On Wed, 13 Feb 2008, Johannes Schindelin wrote:

quoted text
> On Wed, 13 Feb 2008, Jakub Narebski wrote:
> 
> > Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
> > 
> > > On Wed, 13 Feb 2008, Jeff King wrote:
> > > >  	}
> > > > +	if (!hashcmp(sha1, empty_tree.sha1))
> > > > +		return &empty_tree;
> > > >  	return NULL;
> > > >  }
> > > 
> > > Heh.  This is cute.  But it is also a bit hard to reference, no?  I 
> > > mean, you have to remember the SHA-1 of it...
> > > 
> > > Maybe {} ?

IOW something like this (on top of your two patches; feel free to merge):

-- snipsnap --
[PATCH] Make {} synonymous to the empty tree

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
---
 cache.h     |    5 +++++
 sha1_file.c |    4 +---
 sha1_name.c |    5 +++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/cache.h b/cache.h
index f4c56fa..b71f772 100644
--- a/cache.h
+++ b/cache.h
@@ -266,6 +266,11 @@ static inline enum object_type object_type(unsigned int mode)
 #define INFOATTRIBUTES_FILE "info/attributes"
 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 
+/* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */
+#define EMPTY_TREE_SHA1 (unsigned char *)\
+	"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
+	"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
+
 extern int is_bare_repository_cfg;
 extern int is_bare_repository(void);
 extern int is_inside_git_dir(void);
diff --git a/sha1_file.c b/sha1_file.c
index 1a6c7c8..cba629a 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1846,9 +1846,7 @@ static struct cached_object {
 static int cached_object_nr, cached_object_alloc;
 
 static struct cached_object empty_tree = {
-	/* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */
-	"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60"
-	"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04",
+	EMPTY_TREE_SHA1,
 	OBJ_TREE,
 	"",
 	0
diff --git a/sha1_name.c b/sha1_name.c
index 6cfd1f9..3a39a55 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -760,5 +760,10 @@ int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
 			return get_tree_entry(tree_sha1, cp+1, sha1, mode);
 		}
 	}
+	if (ret && !strcmp(name, "{}")) {
+		*mode = 0755;
+		hashcpy(sha1, EMPTY_TREE_SHA1);
+		ret = 0;
+	}
 	return ret;
 }
-
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