packed-backend: new module for handling packed references

Now that the interface between `files_ref_store` and
`packed_ref_store` is relatively narrow, move the latter into a new
module, "refs/packed-backend.h" and "refs/packed-backend.c". It still
doesn't quite implement the `ref_store` interface, but it will soon.

This commit moves code around and adjusts its visibility, but doesn't
change anything.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/refs/packed-backend.h b/refs/packed-backend.h
new file mode 100644
index 000000000..22e8817ac
--- /dev/null
+++ b/refs/packed-backend.h
@@ -0,0 +1,33 @@
+#ifndef REFS_PACKED_BACKEND_H
+#define REFS_PACKED_BACKEND_H
+
+struct packed_ref_store *packed_ref_store_create(
+		const char *path, unsigned int store_flags);
+
+int packed_read_raw_ref(struct packed_ref_store *refs,
+			const char *refname, unsigned char *sha1,
+			struct strbuf *referent, unsigned int *type);
+
+int packed_peel_ref(struct packed_ref_store *refs,
+		    const char *refname, unsigned char *sha1);
+
+struct ref_iterator *packed_ref_iterator_begin(
+		struct packed_ref_store *refs,
+		const char *prefix, unsigned int flags);
+
+/*
+ * Lock the packed-refs file for writing. Flags is passed to
+ * hold_lock_file_for_update(). Return 0 on success. On errors, set
+ * errno appropriately and return a nonzero value.
+ */
+int lock_packed_refs(struct packed_ref_store *refs, int flags);
+
+void add_packed_ref(struct packed_ref_store *refs,
+		    const char *refname, const struct object_id *oid);
+
+int commit_packed_refs(struct packed_ref_store *refs);
+
+int repack_without_refs(struct packed_ref_store *refs,
+			struct string_list *refnames, struct strbuf *err);
+
+#endif /* REFS_PACKED_BACKEND_H */