[PATCH 02/39] repository: introduce object store field

[Jonathan Nieder <jrnieder@gmail.com>]

From: Stefan Beller <sbeller@google.com>

The object store field will contain any objects needed for access to
objects in a given repository.

This patch introduces the object store but for now it is empty.  C99
forbids empty structs, but common C compilers cope well with them and
this struct will gain members very soon (starting with the next
patch).

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Are there any straightforward ways to avoid the empty struct?  Should
the struct have a placeholder member to avoid language issues with an
object that would have size 0?

 object-store.h | 8 ++++++++
 repository.c   | 4 +++-
 repository.h   | 7 +++++++
 3 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 object-store.h

diff --git a/object-store.h b/object-store.h
new file mode 100644
index 0000000000..05722cdde0
--- /dev/null
+++ b/object-store.h
@@ -0,0 +1,8 @@
+#ifndef OBJECT_STORE_H
+#define OBJECT_STORE_H
+
+struct object_store {
+};
+#define OBJECT_STORE_INIT {}
+
+#endif /* OBJECT_STORE_H */
diff --git a/repository.c b/repository.c
index f107af7d76..566753ed4b 100644
--- a/repository.c
+++ b/repository.c
@@ -1,11 +1,13 @@
 #include "cache.h"
 #include "repository.h"
+#include "object-store.h"
 #include "config.h"
 #include "submodule-config.h"
 
 /* The main repository */
 static struct repository the_repo = {
-	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
+	NULL, NULL, NULL, OBJECT_STORE_INIT,
+	NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
 };
 struct repository *the_repository = &the_repo;
 
diff --git a/repository.h b/repository.h
index 7f5e24a0a2..9633ad10f5 100644
--- a/repository.h
+++ b/repository.h
@@ -1,6 +1,8 @@
 #ifndef REPOSITORY_H
 #define REPOSITORY_H
 
+#include "object-store.h"
+
 struct config_set;
 struct index_state;
 struct submodule_cache;
@@ -25,6 +27,11 @@ struct repository {
 	 */
 	char *objectdir;
 
+	/*
+	 * Holds any information related to the object store.
+	 */
+	struct object_store objects;
+
 	/*
 	 * Path to the repository's graft file.
 	 * Cannot be NULL after initialization.
-- 
2.14.1.581.gf28d330327