packfile: add install_packed_git_and_mru()

Create a function to install a new packfile into the packed-git
list and add it to the head of the MRU list.

This function will be used in a later commit to install packfiles
created by dynamic object fetching.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

Author: jeffhostetler

packfile.c

@@ -792,6 +792,14 @@ void packfile_store_add_pack(struct packfile_store *store,
 	hashmap_add(&store->map, &pack->packmap_ent);
 }
 
+void packfile_store_add_pack_also_to_mru(struct repository *r,
+					 struct packed_git *pack)
+{
+	packfile_store_add_pack(r->objects->packfiles, pack);
+	list_add(&pack->mru,
+		 packfile_store_get_packs_mru(r->objects->packfiles));
+}
+
 struct packed_git *packfile_store_load_pack(struct packfile_store *store,
 					    const char *idx_path, int local)
 {

packfile.h

@@ -135,6 +135,13 @@ void packfile_store_reprepare(struct packfile_store *store);
  */
 void packfile_store_add_pack(struct packfile_store *store,
 			     struct packed_git *pack);
+/*
+ * Add the pack to the store so that contained objects become accessible via
+ * the store, and then mark it as most recently used. This moves ownership into
+ * the store.
+ */
+void packfile_store_add_pack_also_to_mru(struct repository *r,
+					 struct packed_git *pack);
 
 /*
  * Load and iterate through all packs of the given repository. This helper