thodg/libgit2/tests/index/nsec.c

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external libgit2 has two distinct requirements that were previously solved by `git_buf`. We require: 1. A general purpose string class that provides a number of utility APIs for manipulating data (eg, concatenating, truncating, etc). 2. A structure that we can use to return strings to callers that they can take ownership of. By using a single class (`git_buf`) for both of these purposes, we have confused the API to the point that refactorings are difficult and reasoning about correctness is also difficult. Move the utility class `git_buf` to be called `git_str`: this represents its general purpose, as an internal string buffer class. The name also is an homage to Junio Hamano ("gitstr"). The public API remains `git_buf`, and has a much smaller footprint. It is generally only used as an "out" param with strict requirements that follow the documentation. (Exceptions exist for some legacy APIs to avoid breaking callers unnecessarily.) Utility functions exist to convert a user-specified `git_buf` to a `git_str` so that we can call internal functions, then converting it back again.

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• tests/index/nsec.c

• #include "clar_libgit2.h"
  #include "index.h"
  #include "git2/sys/index.h"
  #include "git2/repository.h"
  #include "../reset/reset_helpers.h"
  
  static git_repository *repo;
  static git_index *repo_index;
  
  #define TEST_REPO_PATH "nsecs"
  
  /* Fixture setup and teardown */
  void test_index_nsec__initialize(void)
  {
  	repo = cl_git_sandbox_init("nsecs");
  	git_repository_index(&repo_index, repo);
  }
  
  void test_index_nsec__cleanup(void)
  {
  	git_index_free(repo_index);
  	repo_index = NULL;
  
  	cl_git_sandbox_cleanup();
  }
  
  static bool try_create_file_with_nsec_timestamp(const char *path)
  {
  	struct stat st;
  	int try;
  
  	/* retry a few times to avoid nanos *actually* equal 0 race condition */
  	for (try = 0; try < 3; try++) {
  		cl_git_mkfile(path, "This is hopefully a file with nanoseconds!");
  
  		cl_must_pass(p_stat(path, &st));
  
  		if (st.st_ctime_nsec && st.st_mtime_nsec)
  			return true;
  	}
  
  	return false;
  }
  
  /* try to determine if the underlying filesystem supports a resolution
   * higher than a single second.  (i'm looking at you, hfs+)
   */
  static bool should_expect_nsecs(void)
  {
  	git_str nsec_path = GIT_STR_INIT;
  	bool expect;
  
  	git_str_joinpath(&nsec_path, clar_sandbox_path(), "nsec_test");
  
  	expect = try_create_file_with_nsec_timestamp(nsec_path.ptr);
  
  	cl_must_pass(p_unlink(nsec_path.ptr));
  
  	git_str_dispose(&nsec_path);
  
  	return expect;
  }
  
  static bool has_nsecs(void)
  {
  	const git_index_entry *entry;
  	size_t i;
  	bool has_nsecs = false;
  
  	for (i = 0; i < git_index_entrycount(repo_index); i++) {
  		entry = git_index_get_byindex(repo_index, i);
  
  		if (entry->ctime.nanoseconds || entry->mtime.nanoseconds) {
  			has_nsecs = true;
  			break;
  		}
  	}
  
  	return has_nsecs;
  }
  
  void test_index_nsec__has_nanos(void)
  {
  	cl_assert_equal_b(true, has_nsecs());
  }
  
  void test_index_nsec__staging_maintains_other_nanos(void)
  {
  	const git_index_entry *entry;
  	bool expect_nsec, test_file_has_nsec;
  
  	expect_nsec = should_expect_nsecs();
  	test_file_has_nsec = try_create_file_with_nsec_timestamp("nsecs/a.txt");
  
  	cl_assert_equal_b(expect_nsec, test_file_has_nsec);
  
  	cl_git_pass(git_index_add_bypath(repo_index, "a.txt"));
  	cl_git_pass(git_index_write(repo_index));
  
  	cl_git_pass(git_index_write(repo_index));
  
  	git_index_read(repo_index, 1);
  	cl_assert_equal_b(true, has_nsecs());
  
  	cl_assert((entry = git_index_get_bypath(repo_index, "a.txt", 0)));
  
  	/* if we are writing nanoseconds to the index, expect them to be
  	 * nonzero.
  	 */
  	if (expect_nsec) {
  		cl_assert(entry->ctime.nanoseconds != 0);
  		cl_assert(entry->mtime.nanoseconds != 0);
  	} else {
  		cl_assert_equal_i(0, entry->ctime.nanoseconds);
  		cl_assert_equal_i(0, entry->mtime.nanoseconds);
  	}
  }
  
  void test_index_nsec__status_doesnt_clear_nsecs(void)
  {
  	git_status_list *statuslist;
  
  	cl_git_pass(git_status_list_new(&statuslist, repo, NULL));
  
  	git_index_read(repo_index, 1);
  	cl_assert_equal_b(true, has_nsecs());
  
  	git_status_list_free(statuslist);
  }
  

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