thodg/libgit2/tests/object/tree/walk.c

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• Hash : 25e0b157
  Author :
  Date : 2013-12-06T15:07:57
  

  Remove converting user error to GIT_EUSER This changes the behavior of callbacks so that the callback error code is not converted into GIT_EUSER and instead we propagate the return value through to the caller. Instead of using the giterr_capture and giterr_restore functions, we now rely on all functions to pass back the return value from a callback. To avoid having a return value with no error message, the user can call the public giterr_set_str or some such function to set an error message. There is a new helper 'giterr_set_callback' that functions can invoke after making a callback which ensures that some error message was set in case the callback did not set one. In places where the sign of the callback return value is meaningful (e.g. positive to skip, negative to abort), only the negative values are returned back to the caller, obviously, since the other values allow for continuing the loop. The hardest parts of this were in the checkout code where positive return values were overloaded as meaningful values for checkout. I fixed this by adding an output parameter to many of the internal checkout functions and removing the overload. This added some code, but it is probably a better implementation. There is some funkiness in the network code where user provided callbacks could be returning a positive or a negative value and we want to rely on that to cancel the loop. There are still a couple places where an user error might get turned into GIT_EUSER there, I think, though none exercised by the tests.

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• tests/object/tree/walk.c

• #include "clar_libgit2.h"
  #include "tree.h"
  
  static const char *tree_oid = "1810dff58d8a660512d4832e740f692884338ccd";
  static git_repository *g_repo;
  
  void test_object_tree_walk__initialize(void)
  {
     g_repo = cl_git_sandbox_init("testrepo");
  }
  
  void test_object_tree_walk__cleanup(void)
  {
     cl_git_sandbox_cleanup();
  }
  
  static int treewalk_count_cb(
  	const char *root, const git_tree_entry *entry, void *payload)
  {
  	int *count = payload;
  
  	GIT_UNUSED(root);
  	GIT_UNUSED(entry);
  
  	(*count) += 1;
  
  	return 0;
  }
  
  void test_object_tree_walk__0(void)
  {
  	git_oid id;
  	git_tree *tree;
  	int ct;
  
  	git_oid_fromstr(&id, tree_oid);
  
  	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
  
  	ct = 0;
  	cl_git_pass(git_tree_walk(tree, GIT_TREEWALK_PRE, treewalk_count_cb, &ct));
  	cl_assert_equal_i(3, ct);
  
  	ct = 0;
  	cl_git_pass(git_tree_walk(tree, GIT_TREEWALK_POST, treewalk_count_cb, &ct));
  	cl_assert_equal_i(3, ct);
  
  	git_tree_free(tree);
  }
  
  
  static int treewalk_stop_cb(
  	const char *root, const git_tree_entry *entry, void *payload)
  {
  	int *count = payload;
  
  	GIT_UNUSED(root);
  	GIT_UNUSED(entry);
  
  	(*count) += 1;
  
  	return (*count == 2) ? -123 : 0;
  }
  
  static int treewalk_stop_immediately_cb(
  	const char *root, const git_tree_entry *entry, void *payload)
  {
  	GIT_UNUSED(root);
  	GIT_UNUSED(entry);
  	GIT_UNUSED(payload);
  	return -100;
  }
  
  void test_object_tree_walk__1(void)
  {
  	git_oid id;
  	git_tree *tree;
  	int ct;
  
  	git_oid_fromstr(&id, tree_oid);
  
  	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
  
  	ct = 0;
  	cl_assert_equal_i(
  		-123, git_tree_walk(tree, GIT_TREEWALK_PRE, treewalk_stop_cb, &ct));
  	cl_assert_equal_i(2, ct);
  
  	ct = 0;
  	cl_assert_equal_i(
  		-123, git_tree_walk(tree, GIT_TREEWALK_POST, treewalk_stop_cb, &ct));
  	cl_assert_equal_i(2, ct);
  
  	cl_assert_equal_i(
  		-100, git_tree_walk(
  			tree, GIT_TREEWALK_PRE, treewalk_stop_immediately_cb, NULL));
  
  	cl_assert_equal_i(
  		-100, git_tree_walk(
  			tree, GIT_TREEWALK_POST, treewalk_stop_immediately_cb, NULL));
  
  	git_tree_free(tree);
  }
  
  
  struct treewalk_skip_data {
  	int files;
  	int dirs;
  	const char *skip;
  	const char *stop;
  };
  
  static int treewalk_skip_de_cb(
  	const char *root, const git_tree_entry *entry, void *payload)
  {
  	struct treewalk_skip_data *data = payload;
  	const char *name = git_tree_entry_name(entry);
  
  	GIT_UNUSED(root);
  
  	if (git_tree_entry_type(entry) == GIT_OBJ_TREE)
  		data->dirs++;
  	else
  		data->files++;
  
  	if (data->skip && !strcmp(name, data->skip))
  		return 1;
  	else if (data->stop && !strcmp(name, data->stop))
  		return -1;
  	else
  		return 0;
  }
  
  void test_object_tree_walk__2(void)
  {
  	git_oid id;
  	git_tree *tree;
  	struct treewalk_skip_data data;
  
  	/* look up a deep tree */
  	git_oid_fromstr(&id, "ae90f12eea699729ed24555e40b9fd669da12a12");
  	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
  
  	memset(&data, 0, sizeof(data));
  	data.skip = "de";
  
  	cl_assert_equal_i(0, git_tree_walk(
  		tree, GIT_TREEWALK_PRE, treewalk_skip_de_cb, &data));
  	cl_assert_equal_i(5, data.files);
  	cl_assert_equal_i(3, data.dirs);
  
  	memset(&data, 0, sizeof(data));
  	data.stop = "3.txt";
  
  	cl_assert_equal_i(-1, git_tree_walk(
  		tree, GIT_TREEWALK_PRE, treewalk_skip_de_cb, &data));
  	cl_assert_equal_i(3, data.files);
  	cl_assert_equal_i(2, data.dirs);
  
  	memset(&data, 0, sizeof(data));
  	data.skip = "new.txt";
  
  	cl_assert_equal_i(0, git_tree_walk(
  		tree, GIT_TREEWALK_PRE, treewalk_skip_de_cb, &data));
  	cl_assert_equal_i(7, data.files);
  	cl_assert_equal_i(4, data.dirs);
  
  	memset(&data, 0, sizeof(data));
  	data.stop = "new.txt";
  
  	cl_assert_equal_i(-1, git_tree_walk(
  		tree, GIT_TREEWALK_PRE, treewalk_skip_de_cb, &data));
  	cl_assert_equal_i(7, data.files);
  	cl_assert_equal_i(4, data.dirs);
  
  	git_tree_free(tree);
  }
  

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