Merge branch 'ps/object-store'

Code clean-up around object access API.

* ps/object-store:
  odb: rename `read_object_with_reference()`
  odb: rename `pretend_object_file()`
  odb: rename `has_object()`
  odb: rename `repo_read_object_file()`
  odb: rename `oid_object_info()`
  odb: trivial refactorings to get rid of `the_repository`
  odb: get rid of `the_repository` when handling submodule sources
  odb: get rid of `the_repository` when handling the primary source
  odb: get rid of `the_repository` in `for_each()` functions
  odb: get rid of `the_repository` when handling alternates
  odb: get rid of `the_repository` in `odb_mkstemp()`
  odb: get rid of `the_repository` in `assert_oid_type()`
  odb: get rid of `the_repository` in `find_odb()`
  odb: introduce parent pointers
  object-store: rename files to "odb.{c,h}"
  object-store: rename `object_directory` to `odb_source`
  object-store: rename `raw_object_store` to `object_database`

builtin/receive-pack.c

@@ -33,7 +33,7 @@
 #include "packfile.h"
 #include "object-file.h"
 #include "object-name.h"
-#include "object-store.h"
+#include "odb.h"
 #include "path.h"
 #include "protocol.h"
 #include "commit-reach.h"
@@ -359,7 +359,8 @@ static void write_head_info(void)
 
 	refs_for_each_fullref_in(get_main_ref_store(the_repository), "",
 				 exclude_patterns, show_ref_cb, &seen);
-	for_each_alternate_ref(show_one_alternate_ref, &seen);
+	odb_for_each_alternate_ref(the_repository->objects,
+				   show_one_alternate_ref, &seen);
 
 	oidset_clear(&seen);
 	strvec_clear(&excludes_vector);
@@ -1508,8 +1509,8 @@ static const char *update(struct command *cmd, struct shallow_info *si)
 	}
 
 	if (!is_null_oid(new_oid) &&
-	    !has_object(the_repository, new_oid,
-			HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR)) {
+	    !odb_has_object(the_repository->objects, new_oid,
+			    HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR)) {
 		error("unpack should have generated %s, "
 		      "but I can't find it!", oid_to_hex(new_oid));
 		ret = "bad pack";