odb: add git_odb_foreach()

Go through each backend and list every objects that exists in
them. This allows fsck-like uses.

2 files changed, 20 insertions, 0 deletions

diff --git a/include/git2/odb.h b/include/git2/odb.h
index e2443178c..dac9e06a9 100644
--- a/include/git2/odb.h
+++ b/include/git2/odb.h
@@ -173,6 +173,20 @@ GIT_EXTERN(int) git_odb_read_header(size_t *len_p, git_otype *type_p, git_odb *d
 GIT_EXTERN(int) git_odb_exists(git_odb *db, const git_oid *id);
 
 /**
+ * List all objects available in the database
+ *
+ * The callback will be called for each object available in the
+ * database. Note that the objects are likely to be returned in the
+ * index order, which would make accessing the objects in that order
+ * inefficient.
+ *
+ * @param db database to use
+ * @param cb the callback to call for each object
+ * @param data data to pass to the callback
+ */
+GIT_EXTERN(int) git_odb_foreach(git_odb *db, int (*cb)(git_oid *oid, void *data), void *data);
+
+/**
  * Write an object directly into the ODB
  *
  * This method writes a full object straight into the ODB.
diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
index f4620f5f4..3f67202d1 100644
--- a/include/git2/odb_backend.h
+++ b/include/git2/odb_backend.h
@@ -71,6 +71,12 @@ struct git_odb_backend {
 			struct git_odb_backend *,
 			const git_oid *);
 
+	int (*foreach)(
+		       struct git_odb_backend *,
+		       int (*cb)(git_oid *oid, void *data),
+		       void *data
+		       );
+
 	void (* free)(struct git_odb_backend *);
 };