builtin/ls-tree: let the oid determine the output algorithm

Update cmd_ls_tree to call get_oid_with_context and pass
GET_OID_HASH_ANY instead of calling the simpler repo_get_oid.

This implments in ls-tree the behavior that asking to display a sha1
hash displays the corrresponding sha1 encoded object and asking to
display a sha256 hash displayes the corresponding sha256 encoded
object.

This is useful for testing the conversion of an object to an
equivlanet object encoded with a different hash function.

Signed-off-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ebiederm

builtin/ls-tree.c

@@ -376,6 +376,7 @@ int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	struct ls_tree_cmdmode_to_fmt *m2f = ls_tree_cmdmode_format;
+	struct object_context obj_context;
 	int ret;
 
 	git_config(git_default_config, NULL);
@@ -407,7 +408,9 @@ int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 			ls_tree_usage, ls_tree_options);
 	if (argc < 1)
 		usage_with_options(ls_tree_usage, ls_tree_options);
-	if (repo_get_oid(the_repository, argv[0], &oid))
+	if (get_oid_with_context(the_repository, argv[0],
+				 GET_OID_HASH_ANY, &oid,
+				 &obj_context))
 		die("Not a valid object name %s", argv[0]);
 
 	/*