thodg/libgit2/tests/stress/diff.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/stress/diff.c

• #include "clar_libgit2.h"
  #include "../diff/diff_helpers.h"
  
  static git_repository *g_repo = NULL;
  
  void test_stress_diff__initialize(void)
  {
  }
  
  void test_stress_diff__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  #define ANOTHER_POEM \
  "OH, glorious are the guarded heights\nWhere guardian souls abide—\nSelf-exiled from our gross delights—\nAbove, beyond, outside:\nAn ampler arc their spirit swings—\nCommands a juster view—\nWe have their word for all these things,\nNo doubt their words are true.\n\nYet we, the bond slaves of our day,\nWhom dirt and danger press—\nCo-heirs of insolence, delay,\nAnd leagued unfaithfulness—\nSuch is our need must seek indeed\nAnd, having found, engage\nThe men who merely do the work\nFor which they draw the wage.\n\nFrom forge and farm and mine and bench,\nDeck, altar, outpost lone—\nMill, school, battalion, counter, trench,\nRail, senate, sheepfold, throne—\nCreation's cry goes up on high\nFrom age to cheated age:\n\"Send us the men who do the work\n\"For which they draw the wage!\"\n"
  
  static void test_with_many(int expected_new)
  {
  	git_index *index;
  	git_tree *tree, *new_tree;
  	git_diff *diff = NULL;
  	diff_expects exp;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(p_rename("renames/ikeepsix.txt", "renames/ikeepsix2.txt"));
  	cl_git_pass(git_index_remove_bypath(index, "ikeepsix.txt"));
  	cl_git_pass(git_index_add_bypath(index, "ikeepsix2.txt"));
  	cl_git_pass(git_index_write(index));
  
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, NULL, NULL, NULL, &exp));
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(expected_new + 1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(expected_new + 2, exp.files);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, NULL, NULL, NULL, &exp));
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(expected_new, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(expected_new + 1, exp.files);
  
  	git_diff_free(diff);
  
  	cl_repo_commit_from_index(NULL, g_repo, NULL, 1372350000, "yoyoyo");
  	cl_git_pass(git_revparse_single(
  		(git_object **)&new_tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, tree, new_tree, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, NULL, NULL, NULL, &exp));
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(expected_new + 1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(expected_new + 2, exp.files);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, NULL, NULL, NULL, &exp));
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(expected_new, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(expected_new + 1, exp.files);
  
  	git_diff_free(diff);
  
  	git_tree_free(new_tree);
  	git_tree_free(tree);
  	git_index_free(index);
  }
  
  void test_stress_diff__rename_big_files(void)
  {
  	git_index *index;
  	char tmp[64];
  	int i, j;
  	git_str b = GIT_STR_INIT;
  
  	g_repo = cl_git_sandbox_init("renames");
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  
  	for (i = 0; i < 100; i += 1) {
  		p_snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
  		for (j = i * 256; j > 0; --j)
  			git_str_printf(&b, "more content %d\n", i);
  		cl_git_mkfile(tmp, b.ptr);
  	}
  
  	for (i = 0; i < 100; i += 1) {
  		p_snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
  		cl_git_pass(git_index_add_bypath(index, tmp + strlen("renames/")));
  	}
  
  	git_str_dispose(&b);
  	git_index_free(index);
  
  	test_with_many(100);
  }
  
  void test_stress_diff__rename_many_files(void)
  {
  	git_index *index;
  	char tmp[64];
  	int i;
  	git_str b = GIT_STR_INIT;
  
  	g_repo = cl_git_sandbox_init("renames");
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  
  	git_str_printf(&b, "%08d\n" ANOTHER_POEM "%08d\n" ANOTHER_POEM ANOTHER_POEM, 0, 0);
  
  	for (i = 0; i < 2500; i += 1) {
  		p_snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
  		p_snprintf(b.ptr, 9, "%08d", i);
  		b.ptr[8] = '\n';
  		cl_git_mkfile(tmp, b.ptr);
  	}
  	git_str_dispose(&b);
  
  	for (i = 0; i < 2500; i += 1) {
  		p_snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
  		cl_git_pass(git_index_add_bypath(index, tmp + strlen("renames/")));
  	}
  
  	git_index_free(index);
  
  	test_with_many(2500);
  }
  

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