thodg/libgit2/tests/index/version.c

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• Hash : 92d3ea4e
  Author :
  Date : 2017-05-19T13:04:32
  

  tests: index::version: improve write test for index v4 The current write test does not trigger some edge-cases in the index version 4 path compression code. Rewrite the test to start off the an empty standard repository, creating index entries with interesting paths itself. This allows for more fine-grained control over checked paths. Furthermore, we now also verify that entry paths are actually reconstructed correctly.

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• tests/index/version.c

• #include "clar_libgit2.h"
  #include "index.h"
  
  static git_repository *g_repo = NULL;
  
  void test_index_version__cleanup(void)
  {
          cl_git_sandbox_cleanup();
          g_repo = NULL;
  }
  
  void test_index_version__can_read_v4(void)
  {
  	const char *paths[] = {
  	    "file.tx", "file.txt", "file.txz", "foo", "zzz",
  	};
  	git_index *index;
  	size_t i;
  
  	g_repo = cl_git_sandbox_init("indexv4");
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_assert_equal_sz(git_index_entrycount(index), 5);
  
  	for (i = 0; i < ARRAY_SIZE(paths); i++) {
  		const git_index_entry *entry =
  		    git_index_get_bypath(index, paths[i], GIT_INDEX_STAGE_NORMAL);
  
  		cl_assert(entry != NULL);
  	}
  
  	git_index_free(index);
  }
  
  void test_index_version__can_write_v4(void)
  {
  	const char *paths[] = {
  	    "foo",
  	    "foox",
  	    "foobar",
  	    "foobal",
  	    "x",
  	    "xz",
  	    "xyzzyx"
  	};
  	git_index_entry entry;
  	git_index *index;
  	size_t i;
  
  	g_repo = cl_git_sandbox_init("empty_standard_repo");
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_set_version(index, 4));
  
  	for (i = 0; i < ARRAY_SIZE(paths); i++) {
  		memset(&entry, 0, sizeof(entry));
  		entry.path = paths[i];
  		entry.mode = GIT_FILEMODE_BLOB;
  		cl_git_pass(git_index_add_frombuffer(index, &entry, paths[i],
  						     strlen(paths[i]) + 1));
  	}
  	cl_assert_equal_sz(git_index_entrycount(index), ARRAY_SIZE(paths));
  
  	cl_git_pass(git_index_write(index));
  	git_index_free(index);
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_assert(git_index_version(index) == 4);
  
  	for (i = 0; i < ARRAY_SIZE(paths); i++) {
  		const git_index_entry *e;
  
  		cl_assert(e = git_index_get_bypath(index, paths[i], 0));
  		cl_assert_equal_s(paths[i], e->path);
  	}
  
  	git_index_free(index);
  }
  
  void test_index_version__v4_uses_path_compression(void)
  {
  	git_index_entry entry;
  	git_index *index;
  	char path[250], buf[1];
  	struct stat st;
  	char i, j;
  
  	memset(path, 'a', sizeof(path));
  	memset(buf, 'a', sizeof(buf));
  
  	memset(&entry, 0, sizeof(entry));
  	entry.path = path;
  	entry.mode = GIT_FILEMODE_BLOB;
  
  	g_repo = cl_git_sandbox_init("indexv4");
  	cl_git_pass(git_repository_index(&index, g_repo));
  
  	/* write 676 paths of 250 bytes length */
  	for (i = 'a'; i <= 'z'; i++) {
  		for (j = 'a'; j < 'z'; j++) {
  			path[ARRAY_SIZE(path) - 3] = i;
  			path[ARRAY_SIZE(path) - 2] = j;
  			path[ARRAY_SIZE(path) - 1] = '\0';
  			cl_git_pass(git_index_add_frombuffer(index, &entry, buf, sizeof(buf)));
  		}
  	}
  
  	cl_git_pass(git_index_write(index));
  	cl_git_pass(p_stat(git_index_path(index), &st));
  
  	/*
  	 * Without path compression, the written paths would at
  	 * least take
  	 *
  	 *    (entries * pathlen) = len
  	 *    (676 * 250) = 169000
  	 *
  	 *  bytes. As index v4 uses suffix-compression and our
  	 *  written paths only differ in the last two entries,
  	 *  this number will be much smaller, e.g.
  	 *
  	 *    (1 * pathlen) + (675 * 2) = len
  	 *    676 + 1350 = 2026
  	 *
  	 *    bytes.
  	 *
  	 *    Note that the above calculations do not include
  	 *    additional metadata of the index, e.g. OIDs or
  	 *    index extensions. Including those we get an index
  	 *    of approx. 200kB without compression and 40kB with
  	 *    compression. As this is a lot smaller than without
  	 *    compression, we can verify that path compression is
  	 *    used.
  	 */
  	cl_assert_(st.st_size < 75000, "path compression not enabled");
  
  	git_index_free(index);
  }
  

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