odb: stop including "odb/source.h"

The "odb.h" header currently includes the "odb/source.h" file. This is
somewhat roundabout though: most callers shouldn't have to care about
the `struct odb_source`, but should rather use the ODB-level functions.
Furthermore, it means that a couple of definitions have to live on the
source level even though they should be part of the generic interface.

Reverse the relation between "odb/source.h" and "odb.h" and move the
enums and typedefs that relate to the generic interfaces back into
"odb.h". Add the necessary includes to all files that rely on the
transitive include.

Suggested-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/multi-pack-index.c

@@ -9,6 +9,7 @@
 #include "strbuf.h"
 #include "trace2.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "replace-object.h"
 #include "repository.h"
 

builtin/submodule--helper.c

@@ -29,6 +29,7 @@
 #include "object-file.h"
 #include "object-name.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "advice.h"
 #include "branch.h"
 #include "list-objects-filter-options.h"

odb.h

@@ -3,7 +3,6 @@
 
 #include "hashmap.h"
 #include "object.h"
-#include "odb/source.h"
 #include "oidset.h"
 #include "oidmap.h"
 #include "string-list.h"
@@ -12,6 +11,7 @@
 struct oidmap;
 struct oidtree;
 struct strbuf;
+struct strvec;
 struct repository;
 struct multi_pack_index;
 
@@ -339,6 +339,42 @@ struct object_info {
  */
 #define OBJECT_INFO_INIT { 0 }
 
+/* Flags that can be passed to `odb_read_object_info_extended()`. */
+enum object_info_flags {
+	/* Invoke lookup_replace_object() on the given hash. */
+	OBJECT_INFO_LOOKUP_REPLACE = (1 << 0),
+
+	/* Do not reprepare object sources when the first lookup has failed. */
+	OBJECT_INFO_QUICK = (1 << 1),
+
+	/*
+	 * Do not attempt to fetch the object if missing (even if fetch_is_missing is
+	 * nonzero).
+	 */
+	OBJECT_INFO_SKIP_FETCH_OBJECT = (1 << 2),
+
+	/* Die if object corruption (not just an object being missing) was detected. */
+	OBJECT_INFO_DIE_IF_CORRUPT = (1 << 3),
+
+	/*
+	 * We have already tried reading the object, but it couldn't be found
+	 * via any of the attached sources, and are now doing a second read.
+	 * This second read asks the individual sources to also evaluate
+	 * whether any on-disk state may have changed that may have caused the
+	 * object to appear.
+	 *
+	 * This flag is for internal use, only. The second read only occurs
+	 * when `OBJECT_INFO_QUICK` was not passed.
+	 */
+	OBJECT_INFO_SECOND_READ = (1 << 4),
+
+	/*
+	 * This is meant for bulk prefetching of missing blobs in a partial
+	 * clone. Implies OBJECT_INFO_SKIP_FETCH_OBJECT and OBJECT_INFO_QUICK.
+	 */
+	OBJECT_INFO_FOR_PREFETCH = (OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK),
+};
+
 /*
  * Read object info from the object database and populate the `object_info`
  * structure. Returns 0 on success, a negative error code otherwise.
@@ -432,6 +468,18 @@ enum odb_for_each_object_flags {
 	ODB_FOR_EACH_OBJECT_SKIP_ON_DISK_KEPT_PACKS = (1<<4),
 };
 
+/*
+ * A callback function that can be used to iterate through objects. If given,
+ * the optional `oi` parameter will be populated the same as if you would call
+ * `odb_read_object_info()`.
+ *
+ * Returning a non-zero error code will cause iteration to abort. The error
+ * code will be propagated.
+ */
+typedef int (*odb_for_each_object_cb)(const struct object_id *oid,
+				      struct object_info *oi,
+				      void *cb_data);
+
 /*
  * Iterate through all objects contained in the object database. Note that
  * objects may be iterated over multiple times in case they are either stored

odb/source.h

@@ -2,6 +2,7 @@
 #define ODB_SOURCE_H
 
 #include "object.h"
+#include "odb.h"
 
 enum odb_source_type {
 	/*
@@ -14,61 +15,10 @@ enum odb_source_type {
 	ODB_SOURCE_FILES,
 };
 
-/* Flags that can be passed to `odb_read_object_info_extended()`. */
-enum object_info_flags {
-	/* Invoke lookup_replace_object() on the given hash. */
-	OBJECT_INFO_LOOKUP_REPLACE = (1 << 0),
-
-	/* Do not reprepare object sources when the first lookup has failed. */
-	OBJECT_INFO_QUICK = (1 << 1),
-
-	/*
-	 * Do not attempt to fetch the object if missing (even if fetch_is_missing is
-	 * nonzero).
-	 */
-	OBJECT_INFO_SKIP_FETCH_OBJECT = (1 << 2),
-
-	/* Die if object corruption (not just an object being missing) was detected. */
-	OBJECT_INFO_DIE_IF_CORRUPT = (1 << 3),
-
-	/*
-	 * We have already tried reading the object, but it couldn't be found
-	 * via any of the attached sources, and are now doing a second read.
-	 * This second read asks the individual sources to also evaluate
-	 * whether any on-disk state may have changed that may have caused the
-	 * object to appear.
-	 *
-	 * This flag is for internal use, only. The second read only occurs
-	 * when `OBJECT_INFO_QUICK` was not passed.
-	 */
-	OBJECT_INFO_SECOND_READ = (1 << 4),
-
-	/*
-	 * This is meant for bulk prefetching of missing blobs in a partial
-	 * clone. Implies OBJECT_INFO_SKIP_FETCH_OBJECT and OBJECT_INFO_QUICK.
-	 */
-	OBJECT_INFO_FOR_PREFETCH = (OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK),
-};
-
 struct object_id;
-struct object_info;
 struct odb_read_stream;
-struct odb_transaction;
-struct odb_write_stream;
 struct strvec;
 
-/*
- * A callback function that can be used to iterate through objects. If given,
- * the optional `oi` parameter will be populated the same as if you would call
- * `odb_read_object_info()`.
- *
- * Returning a non-zero error code will cause iteration to abort. The error
- * code will be propagated.
- */
-typedef int (*odb_for_each_object_cb)(const struct object_id *oid,
-				      struct object_info *oi,
-				      void *cb_data);
-
 /*
  * The source is the part of the object database that stores the actual
  * objects. It thus encapsulates the logic to read and write the specific

odb/streaming.c

@@ -7,6 +7,7 @@
 #include "environment.h"
 #include "repository.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "odb/streaming.h"
 #include "replace-object.h"
 

repository.c

@@ -2,6 +2,7 @@
 #include "abspath.h"
 #include "repository.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "config.h"
 #include "object.h"
 #include "lockfile.h"

submodule-config.c

@@ -14,6 +14,7 @@
 #include "strbuf.h"
 #include "object-name.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "parse-options.h"
 #include "thread-utils.h"
 #include "tree-walk.h"

tmp-objdir.c

@@ -11,6 +11,7 @@
 #include "strvec.h"
 #include "quote.h"
 #include "odb.h"
+#include "odb/source.h"
 #include "repository.h"
 
 struct tmp_objdir {