thodg/libgit2/tests/object/lookup.c

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• Hash : 35079f50
  Author :
  Date : 2017-04-21T07:31:56
  

  odb: add option to turn off hash verification Verifying hashsums of objects we are reading from the ODB may be costly as we have to perform an additional hashsum calculation on the object. Especially when reading large objects, the penalty can be as high as 35%, as can be seen when executing the equivalent of `git cat-file` with and without verification enabled. To mitigate for this, we add a global option for libgit2 which enables the developer to turn off the verification, e.g. when he can be reasonably sure that the objects on disk won't be corrupted.

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• tests/object/lookup.c

• #include "clar_libgit2.h"
  
  #include "repository.h"
  
  static git_repository *g_repo;
  
  void test_object_lookup__initialize(void)
  {
  	g_repo = cl_git_sandbox_init("testrepo.git");
  }
  
  void test_object_lookup__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  void test_object_lookup__lookup_wrong_type_returns_enotfound(void)
  {
  	const char *commit = "e90810b8df3e80c413d903f631643c716887138d";
  	git_oid oid;
  	git_object *object;
  
  	cl_git_pass(git_oid_fromstr(&oid, commit));
  	cl_assert_equal_i(
  		GIT_ENOTFOUND, git_object_lookup(&object, g_repo, &oid, GIT_OBJ_TAG));
  }
  
  void test_object_lookup__lookup_nonexisting_returns_enotfound(void)
  {
  	const char *unknown = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef";
  	git_oid oid;
  	git_object *object;
  
  	cl_git_pass(git_oid_fromstr(&oid, unknown));
  	cl_assert_equal_i(
  		GIT_ENOTFOUND, git_object_lookup(&object, g_repo, &oid, GIT_OBJ_ANY));
  }
  
  void test_object_lookup__lookup_wrong_type_by_abbreviated_id_returns_enotfound(void)
  {
  	const char *commit = "e90810b";
  	git_oid oid;
  	git_object *object;
  
  	cl_git_pass(git_oid_fromstrn(&oid, commit, strlen(commit)));
  	cl_assert_equal_i(
  		GIT_ENOTFOUND, git_object_lookup_prefix(&object, g_repo, &oid, strlen(commit), GIT_OBJ_TAG));
  }
  
  void test_object_lookup__lookup_wrong_type_eventually_returns_enotfound(void)
  {
  	const char *commit = "e90810b8df3e80c413d903f631643c716887138d";
  	git_oid oid;
  	git_object *object;
  
  	cl_git_pass(git_oid_fromstr(&oid, commit));
  
  	cl_git_pass(git_object_lookup(&object, g_repo, &oid, GIT_OBJ_COMMIT));
  	git_object_free(object);
  
  	cl_assert_equal_i(
  		GIT_ENOTFOUND, git_object_lookup(&object, g_repo, &oid, GIT_OBJ_TAG));
  }
  
  void test_object_lookup__lookup_corrupt_object_returns_error(void)
  {
  	const char *commit = "8e73b769e97678d684b809b163bebdae2911720f",
  	      *file = "objects/8e/73b769e97678d684b809b163bebdae2911720f";
  	git_buf path = GIT_BUF_INIT, contents = GIT_BUF_INIT;
  	git_oid oid;
  	git_object *object;
  	size_t i;
  
  	cl_git_pass(git_oid_fromstr(&oid, commit));
  	cl_git_pass(git_buf_joinpath(&path, git_repository_path(g_repo), file));
  	cl_git_pass(git_futils_readbuffer(&contents, path.ptr));
  
  	/* Corrupt and try to read the object */
  	for (i = 0; i < contents.size; i++) {
  		contents.ptr[i] ^= 0x1;
  		cl_git_pass(git_futils_writebuffer(&contents, path.ptr, O_RDWR, 0644));
  		cl_git_fail(git_object_lookup(&object, g_repo, &oid, GIT_OBJ_COMMIT));
  		contents.ptr[i] ^= 0x1;
  	}
  
  	/* Restore original content and assert we can read the object */
  	cl_git_pass(git_futils_writebuffer(&contents, path.ptr, O_RDWR, 0644));
  	cl_git_pass(git_object_lookup(&object, g_repo, &oid, GIT_OBJ_COMMIT));
  
  	git_object_free(object);
  	git_buf_free(&path);
  	git_buf_free(&contents);
  }
  
  void test_object_lookup__lookup_object_with_wrong_hash_returns_error(void)
  {
  	const char *oldloose = "objects/8e/73b769e97678d684b809b163bebdae2911720f",
  	      *newloose = "objects/8e/73b769e97678d684b809b163bebdae2911720e",
  	      *commit = "8e73b769e97678d684b809b163bebdae2911720e";
  	git_buf oldpath = GIT_BUF_INIT, newpath = GIT_BUF_INIT;
  	git_object *object;
  	git_oid oid;
  
  	cl_git_pass(git_oid_fromstr(&oid, commit));
  
  	/* Copy object to another location with wrong hash */
  	cl_git_pass(git_buf_joinpath(&oldpath, git_repository_path(g_repo), oldloose));
  	cl_git_pass(git_buf_joinpath(&newpath, git_repository_path(g_repo), newloose));
  	cl_git_pass(git_futils_cp(oldpath.ptr, newpath.ptr, 0644));
  
  	/* Verify that lookup fails due to a hashsum mismatch */
  	cl_git_fail_with(GIT_EMISMATCH, git_object_lookup(&object, g_repo, &oid, GIT_OBJ_COMMIT));
  
  	/* Disable verification and try again */
  	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 0));
  	cl_git_pass(git_object_lookup(&object, g_repo, &oid, GIT_OBJ_COMMIT));
  	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 1));
  
  	git_buf_free(&oldpath);
  	git_buf_free(&newpath);
  }
  

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