thodg/libgit2/tests/config/write.c

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• Hash : 548cb334
  Author :
  Date : 2015-09-13T16:32:24
  

  Don't free config in `git_transaction_commit`. The config is not owned by the transaction, so please don’t free it.

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• tests/config/write.c

• #include "clar_libgit2.h"
  #include "buffer.h"
  #include "fileops.h"
  #include "git2/sys/config.h"
  #include "config_file.h"
  #include "config.h"
  
  void test_config_write__initialize(void)
  {
  	cl_fixture_sandbox("config/config9");
  	cl_fixture_sandbox("config/config15");
  	cl_fixture_sandbox("config/config17");
  }
  
  void test_config_write__cleanup(void)
  {
  	cl_fixture_cleanup("config9");
  	cl_fixture_cleanup("config15");
  	cl_fixture_cleanup("config17");
  }
  
  void test_config_write__replace_value(void)
  {
  	git_config *cfg;
  	int i;
  	int64_t l, expected = +9223372036854775803;
  
  	/* By freeing the config, we make sure we flush the values  */
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_int32(cfg, "core.dummy", 5));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_int32(&i, cfg, "core.dummy"));
  	cl_assert(i == 5);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_int32(cfg, "core.dummy", 1));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_int64(cfg, "core.verylong", expected));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_int64(&l, cfg, "core.verylong"));
  	cl_assert(l == expected);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_must_fail(git_config_get_int32(&i, cfg, "core.verylong"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_int64(cfg, "core.verylong", 1));
  	git_config_free(cfg);
  }
  
  void test_config_write__delete_value(void)
  {
  	git_config *cfg;
  	int32_t i;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_int32(cfg, "core.dummy", 5));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_delete_entry(cfg, "core.dummy"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_assert(git_config_get_int32(&i, cfg, "core.dummy") == GIT_ENOTFOUND);
  	cl_git_pass(git_config_set_int32(cfg, "core.dummy", 1));
  	git_config_free(cfg);
  }
  
  /*
   * At the beginning of the test:
   *  - config9 has: core.dummy2=42
   *  - config15 has: core.dummy2=7
   */
  void test_config_write__delete_value_at_specific_level(void)
  {
  	git_config *cfg, *cfg_specific;
  	int32_t i;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config15"));
  	cl_git_pass(git_config_get_int32(&i, cfg, "core.dummy2"));
  	cl_assert(i == 7);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_new(&cfg));
  	cl_git_pass(git_config_add_file_ondisk(cfg, "config9",
  		GIT_CONFIG_LEVEL_LOCAL, 0));
  	cl_git_pass(git_config_add_file_ondisk(cfg, "config15",
  		GIT_CONFIG_LEVEL_GLOBAL, 0));
  
  	cl_git_pass(git_config_open_level(&cfg_specific, cfg, GIT_CONFIG_LEVEL_GLOBAL));
  
  	cl_git_pass(git_config_delete_entry(cfg_specific, "core.dummy2"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config15"));
  	cl_assert(git_config_get_int32(&i, cfg, "core.dummy2") == GIT_ENOTFOUND);
  	cl_git_pass(git_config_set_int32(cfg, "core.dummy2", 7));
  
  	git_config_free(cfg_specific);
  	git_config_free(cfg);
  }
  
  /*
   * This test exposes a bug where duplicate empty section headers could prevent
   * deletion of config entries.
   */
  void test_config_write__delete_value_with_duplicate_header(void)
  {
  	const char *file_name  = "config-duplicate-header";
  	const char *entry_name = "remote.origin.url";
  	git_config *cfg;
  	git_config_entry *entry;
  
  	/* This config can occur after removing and re-adding the origin remote */
  	const char *file_content =
  		"[remote \"origin\"]\n"		\
  		"[branch \"master\"]\n"		\
  		"	remote = \"origin\"\n"	\
  		"[remote \"origin\"]\n"		\
  		"	url = \"foo\"\n";
  
  	/* Write the test config and make sure the expected entry exists */
  	cl_git_mkfile(file_name, file_content);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_get_entry(&entry, cfg, entry_name));
  
  	/* Delete that entry */
  	cl_git_pass(git_config_delete_entry(cfg, entry_name));
  
  	/* Reopen the file and make sure the entry no longer exists */
  	git_config_entry_free(entry);
  	git_config_free(cfg);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_fail(git_config_get_entry(&entry, cfg, entry_name));
  
  	/* Cleanup */
  	git_config_entry_free(entry);
  	git_config_free(cfg);
  }
  
  /*
   * This test exposes a bug where duplicate section headers could cause
   * config_write to add a new entry when one already exists.
   */
  void test_config_write__add_value_with_duplicate_header(void)
  {
  	const char *file_name  = "config-duplicate-insert";
  	const char *entry_name = "foo.c";
  	const char *old_val    = "old";
  	const char *new_val    = "new";
  	const char *str;
  	git_config *cfg, *snapshot;
  
  	/* c = old should be replaced by c = new.
  	 * The bug causes c = new to be inserted under the first 'foo' header.
  	 */
  	const char *file_content =
  		"[foo]\n"   \
  		"  a = b\n" \
  		"[other]\n" \
  		"  a = b\n" \
  		"[foo]\n"   \
  		"  c = old\n";
  
  	/* Write the test config */
  	cl_git_mkfile(file_name, file_content);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  
  	/* make sure the expected entry (foo.c) exists */
  	cl_git_pass(git_config_snapshot(&snapshot, cfg));
  	cl_git_pass(git_config_get_string(&str, snapshot, entry_name));
  	cl_assert_equal_s(old_val, str);
  	git_config_free(snapshot);
  
  	/* Try setting foo.c to something else */
  	cl_git_pass(git_config_set_string(cfg, entry_name, new_val));
  	git_config_free(cfg);
  
  	/* Reopen the file and make sure the new value was set */
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_snapshot(&snapshot, cfg));
  	cl_git_pass(git_config_get_string(&str, snapshot, entry_name));
  	cl_assert_equal_s(new_val, str);
  
  	/* Cleanup */
  	git_config_free(snapshot);
  	git_config_free(cfg);
  }
  
  void test_config_write__overwrite_value_with_duplicate_header(void)
  {
  	const char *file_name  = "config-duplicate-header";
  	const char *entry_name = "remote.origin.url";
  	git_config *cfg;
  	git_config_entry *entry;
  
  	/* This config can occur after removing and re-adding the origin remote */
  	const char *file_content =
  		"[remote \"origin\"]\n"		\
  		"[branch \"master\"]\n"		\
  		"	remote = \"origin\"\n"	\
  		"[remote \"origin\"]\n"		\
  		"	url = \"foo\"\n";
  
  	/* Write the test config and make sure the expected entry exists */
  	cl_git_mkfile(file_name, file_content);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_get_entry(&entry, cfg, entry_name));
  
  	/* Update that entry */
  	cl_git_pass(git_config_set_string(cfg, entry_name, "newurl"));
  
  	/* Reopen the file and make sure the entry was updated */
  	git_config_entry_free(entry);
  	git_config_free(cfg);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_get_entry(&entry, cfg, entry_name));
  
  	cl_assert_equal_s("newurl", entry->value);
  
  	/* Cleanup */
  	git_config_entry_free(entry);
  	git_config_free(cfg);
  }
  
  static int multivar_cb(const git_config_entry *entry, void *data)
  {
  	int *n = (int *)data;
  
  	cl_assert_equal_s(entry->value, "newurl");
  
  	(*n)++;
  
  	return 0;
  }
  
  void test_config_write__overwrite_multivar_within_duplicate_header(void)
  {
  	const char *file_name  = "config-duplicate-header";
  	const char *entry_name = "remote.origin.url";
  	git_config *cfg;
  	git_config_entry *entry;
  	int n = 0;
  
  	/* This config can occur after removing and re-adding the origin remote */
  	const char *file_content =
  		"[remote \"origin\"]\n"		\
  		"	url = \"bar\"\n"		\
  		"[branch \"master\"]\n"		\
  		"	remote = \"origin\"\n"	\
  		"[remote \"origin\"]\n"		\
  		"	url = \"foo\"\n";
  
  	/* Write the test config and make sure the expected entry exists */
  	cl_git_mkfile(file_name, file_content);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_get_entry(&entry, cfg, entry_name));
  
  	/* Update that entry */
  	cl_git_pass(git_config_set_multivar(cfg, entry_name, ".*", "newurl"));
  	git_config_entry_free(entry);
  	git_config_free(cfg);
  
  	/* Reopen the file and make sure the entry was updated */
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_get_multivar_foreach(cfg, entry_name, NULL, multivar_cb, &n));
  	cl_assert_equal_i(2, n);
  
  	/* Cleanup */
  	git_config_free(cfg);
  }
  
  void test_config_write__write_subsection(void)
  {
  	git_config *cfg;
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_string(cfg, "my.own.var", "works"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "my.own.var"));
  	cl_assert_equal_s("works", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  	git_config_free(cfg);
  }
  
  void test_config_write__delete_inexistent(void)
  {
  	git_config *cfg;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_assert(git_config_delete_entry(cfg, "core.imaginary") == GIT_ENOTFOUND);
  	git_config_free(cfg);
  }
  
  void test_config_write__value_containing_quotes(void)
  {
  	git_config *cfg;
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_string(cfg, "core.somevar", "this \"has\" quotes"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this \"has\" quotes", git_buf_cstr(&buf));
  	git_buf_clear(&buf);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this \"has\" quotes", git_buf_cstr(&buf));
  	git_buf_clear(&buf);
  	git_config_free(cfg);
  
  	/* The code path for values that already exist is different, check that one as well */
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_string(cfg, "core.somevar", "this also \"has\" quotes"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this also \"has\" quotes", git_buf_cstr(&buf));
  	git_buf_clear(&buf);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this also \"has\" quotes", git_buf_cstr(&buf));
  	git_buf_free(&buf);
  	git_config_free(cfg);
  }
  
  void test_config_write__escape_value(void)
  {
  	git_config *cfg;
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_set_string(cfg, "core.somevar", "this \"has\" quotes and \t"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this \"has\" quotes and \t", git_buf_cstr(&buf));
  	git_buf_clear(&buf);
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.somevar"));
  	cl_assert_equal_s("this \"has\" quotes and \t", git_buf_cstr(&buf));
  	git_buf_free(&buf);
  	git_config_free(cfg);
  }
  
  void test_config_write__add_value_at_specific_level(void)
  {
  	git_config *cfg, *cfg_specific;
  	int i;
  	int64_t l, expected = +9223372036854775803;
  	git_buf buf = GIT_BUF_INIT;
  
  	// open config15 as global level config file
  	cl_git_pass(git_config_new(&cfg));
  	cl_git_pass(git_config_add_file_ondisk(cfg, "config9",
  		GIT_CONFIG_LEVEL_LOCAL, 0));
  	cl_git_pass(git_config_add_file_ondisk(cfg, "config15",
  		GIT_CONFIG_LEVEL_GLOBAL, 0));
  
  	cl_git_pass(git_config_open_level(&cfg_specific, cfg, GIT_CONFIG_LEVEL_GLOBAL));
  
  	cl_git_pass(git_config_set_int32(cfg_specific, "core.int32global", 28));
  	cl_git_pass(git_config_set_int64(cfg_specific, "core.int64global", expected));
  	cl_git_pass(git_config_set_bool(cfg_specific, "core.boolglobal", true));
  	cl_git_pass(git_config_set_string(cfg_specific, "core.stringglobal", "I'm a global config value!"));
  	git_config_free(cfg_specific);
  	git_config_free(cfg);
  
  	// open config15 as local level config file
  	cl_git_pass(git_config_open_ondisk(&cfg, "config15"));
  
  	cl_git_pass(git_config_get_int32(&i, cfg, "core.int32global"));
  	cl_assert_equal_i(28, i);
  	cl_git_pass(git_config_get_int64(&l, cfg, "core.int64global"));
  	cl_assert(l == expected);
  	cl_git_pass(git_config_get_bool(&i, cfg, "core.boolglobal"));
  	cl_assert_equal_b(true, i);
  	cl_git_pass(git_config_get_string_buf(&buf, cfg, "core.stringglobal"));
  	cl_assert_equal_s("I'm a global config value!", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  	git_config_free(cfg);
  }
  
  void test_config_write__add_value_at_file_with_no_clrf_at_the_end(void)
  {
  	git_config *cfg;
  	int i;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
  	cl_git_pass(git_config_set_int32(cfg, "core.newline", 7));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
  	cl_git_pass(git_config_get_int32(&i, cfg, "core.newline"));
  	cl_assert_equal_i(7, i);
  
  	git_config_free(cfg);
  }
  
  void test_config_write__add_section_at_file_with_no_clrf_at_the_end(void)
  {
  	git_config *cfg;
  	int i;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
  	cl_git_pass(git_config_set_int32(cfg, "diff.context", 10));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
  	cl_git_pass(git_config_get_int32(&i, cfg, "diff.context"));
  	cl_assert_equal_i(10, i);
  
  	git_config_free(cfg);
  }
  
  void test_config_write__add_value_which_needs_quotes(void)
  {
  	git_config *cfg, *base;
  	const char* str1;
  	const char* str2;
  	const char* str3;
  	const char* str4;
  	const char* str5;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
  	cl_git_pass(git_config_set_string(cfg, "core.startwithspace", " Something"));
  	cl_git_pass(git_config_set_string(cfg, "core.endwithspace", "Something "));
  	cl_git_pass(git_config_set_string(cfg, "core.containscommentchar1", "some#thing"));
  	cl_git_pass(git_config_set_string(cfg, "core.containscommentchar2", "some;thing"));
  	cl_git_pass(git_config_set_string(cfg, "core.startwhithsapceandcontainsdoublequote", " some\"thing"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_config_open_ondisk(&base, "config17"));
  	cl_git_pass(git_config_snapshot(&cfg, base));
  	cl_git_pass(git_config_get_string(&str1, cfg, "core.startwithspace"));
  	cl_assert_equal_s(" Something", str1);
  	cl_git_pass(git_config_get_string(&str2, cfg, "core.endwithspace"));
  	cl_assert_equal_s("Something ", str2);
  	cl_git_pass(git_config_get_string(&str3, cfg, "core.containscommentchar1"));
  	cl_assert_equal_s("some#thing", str3);
  	cl_git_pass(git_config_get_string(&str4, cfg, "core.containscommentchar2"));
  	cl_assert_equal_s("some;thing", str4);
  	cl_git_pass(git_config_get_string(&str5, cfg, "core.startwhithsapceandcontainsdoublequote"));
  	cl_assert_equal_s(" some\"thing", str5);
  	git_config_free(cfg);
  	git_config_free(base);
  }
  
  void test_config_write__can_set_a_value_to_NULL(void)
  {
      git_repository *repository;
      git_config *config;
  
      repository = cl_git_sandbox_init("testrepo.git");
  
      cl_git_pass(git_repository_config(&config, repository));
      cl_git_fail(git_config_set_string(config, "a.b.c", NULL));
      git_config_free(config);
  
      cl_git_sandbox_cleanup();
  }
  
  void test_config_write__can_set_an_empty_value(void)
  {
  	git_repository *repository;
  	git_config *config;
  	git_buf buf = {0};
  
  	repository = cl_git_sandbox_init("testrepo.git");
  	cl_git_pass(git_repository_config(&config, repository));
  
  	cl_git_pass(git_config_set_string(config, "core.somevar", ""));
  	cl_git_pass(git_config_get_string_buf(&buf, config, "core.somevar"));
  	cl_assert_equal_s("", buf.ptr);
  
  	git_buf_free(&buf);
  	git_config_free(config);
  	cl_git_sandbox_cleanup();
  }
  
  void test_config_write__updating_a_locked_config_file_returns_ELOCKED(void)
  {
  	git_config *cfg;
  
  	cl_git_pass(git_config_open_ondisk(&cfg, "config9"));
  
  	cl_git_mkfile("config9.lock", "[core]\n");
  
  	cl_git_fail_with(git_config_set_string(cfg, "core.dump", "boom"), GIT_ELOCKED);
  
  	git_config_free(cfg);
  }
  
  void test_config_write__outside_change(void)
  {
  	int32_t tmp;
  	git_config *cfg;
  	const char *filename = "config-ext-change";
  
  	cl_git_mkfile(filename, "[old]\nvalue = 5\n");
  
  	cl_git_pass(git_config_open_ondisk(&cfg, filename));
  
  	cl_git_pass(git_config_get_int32(&tmp, cfg, "old.value"));
  
  	/* Change the value on the file itself (simulate external process) */
  	cl_git_mkfile(filename, "[old]\nvalue = 6\n");
  
  	cl_git_pass(git_config_set_int32(cfg, "new.value", 7));
  
  	cl_git_pass(git_config_get_int32(&tmp, cfg, "old.value"));
  	cl_assert_equal_i(6, tmp);
  
  	git_config_free(cfg);
  }
  
  #define SECTION_FOO \
  	"\n"                     \
  	"    \n"                 \
  	" [section \"foo\"]  \n" \
  	" # here's a comment\n"  \
  	"\tname = \"value\"\n"   \
  	"  name2 = \"value2\"\n" \
  	";  another comment!\n"
  
  #define SECTION_BAR \
  	"[section \"bar\"]\t\n"  \
  	"\t  \n"                 \
  	" barname=\"value\"\n"
  
  
  void test_config_write__preserves_whitespace_and_comments(void)
  {
  	const char *file_name  = "config-duplicate-header";
  	const char *n;
  	git_config *cfg;
  	git_buf newfile = GIT_BUF_INIT;
  
  	/* This config can occur after removing and re-adding the origin remote */
  	const char *file_content = SECTION_FOO SECTION_BAR;
  
  	/* Write the test config and make sure the expected entry exists */
  	cl_git_mkfile(file_name, file_content);
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_set_string(cfg, "section.foo.other", "otherval"));
  	cl_git_pass(git_config_set_string(cfg, "newsection.newname", "new_value"));
  
  	/* Ensure that we didn't needlessly mangle the config file */
  	cl_git_pass(git_futils_readbuffer(&newfile, file_name));
  	n = newfile.ptr;
  
  	cl_assert_equal_strn(SECTION_FOO, n, strlen(SECTION_FOO));
  	n += strlen(SECTION_FOO);
  
  	cl_assert_equal_strn("\tother = otherval\n", n, strlen("\tother = otherval\n"));
  	n += strlen("\tother = otherval\n");
  
  	cl_assert_equal_strn(SECTION_BAR, n, strlen(SECTION_BAR));
  	n += strlen(SECTION_BAR);
  
  	cl_assert_equal_s("[newsection]\n\tnewname = new_value\n", n);
  
  	git_buf_free(&newfile);
  	git_config_free(cfg);
  }
  
  void test_config_write__preserves_entry_with_name_only(void)
  {
  	const char *file_name  = "config-empty-value";
  	git_config *cfg;
  	git_buf newfile = GIT_BUF_INIT;
  
  	/* Write the test config and make sure the expected entry exists */
  	cl_git_mkfile(file_name, "[section \"foo\"]\n\tname\n");
  	cl_git_pass(git_config_open_ondisk(&cfg, file_name));
  	cl_git_pass(git_config_set_string(cfg, "newsection.newname", "new_value"));
  	cl_git_pass(git_config_set_string(cfg, "section.foo.other", "otherval"));
  
  	cl_git_pass(git_futils_readbuffer(&newfile, file_name));
  	cl_assert_equal_s("[section \"foo\"]\n\tname\n\tother = otherval\n[newsection]\n\tnewname = new_value\n", newfile.ptr);
  
  	git_buf_free(&newfile);
  	git_config_free(cfg);
  }
  
  void test_config_write__to_empty_file(void)
  {
  	git_config *cfg;
  	const char *filename = "config-file";
  	git_buf result = GIT_BUF_INIT;
  
  	cl_git_mkfile(filename, "");
  	cl_git_pass(git_config_open_ondisk(&cfg, filename));
  	cl_git_pass(git_config_set_string(cfg, "section.name", "value"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_futils_readbuffer(&result, "config-file"));
  	cl_assert_equal_s("[section]\n\tname = value\n", result.ptr);
  
  	git_buf_free(&result);
  }
  
  void test_config_write__to_file_with_only_comment(void)
  {
  	git_config *cfg;
  	const char *filename = "config-file";
  	git_buf result = GIT_BUF_INIT;
  
  	cl_git_mkfile(filename, "\n\n");
  	cl_git_pass(git_config_open_ondisk(&cfg, filename));
  	cl_git_pass(git_config_set_string(cfg, "section.name", "value"));
  	git_config_free(cfg);
  
  	cl_git_pass(git_futils_readbuffer(&result, "config-file"));
  	cl_assert_equal_s("\n\n[section]\n\tname = value\n", result.ptr);
  
  	git_buf_free(&result);
  }
  
  void test_config_write__locking(void)
  {
  	git_config *cfg, *cfg2;
  	git_config_entry *entry;
  	git_transaction *tx;
  	const char *filename = "locked-file";
  
  	/* Open the config and lock it */
  	cl_git_mkfile(filename, "[section]\n\tname = value\n");
  	cl_git_pass(git_config_open_ondisk(&cfg, filename));
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
  	cl_assert_equal_s("value", entry->value);
  	git_config_entry_free(entry);
  	cl_git_pass(git_config_lock(&tx, cfg));
  
  	/* Change entries in the locked backend */
  	cl_git_pass(git_config_set_string(cfg, "section.name", "other value"));
  	cl_git_pass(git_config_set_string(cfg, "section2.name3", "more value"));
  
  	/* We can see that the file we read from hasn't changed */
  	cl_git_pass(git_config_open_ondisk(&cfg2, filename));
  	cl_git_pass(git_config_get_entry(&entry, cfg2, "section.name"));
  	cl_assert_equal_s("value", entry->value);
  	git_config_entry_free(entry);
  	cl_git_fail_with(GIT_ENOTFOUND, git_config_get_entry(&entry, cfg2, "section2.name3"));
  	git_config_free(cfg2);
  
  	/* And we also get the old view when we read from the locked config */
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
  	cl_assert_equal_s("value", entry->value);
  	git_config_entry_free(entry);
  	cl_git_fail_with(GIT_ENOTFOUND, git_config_get_entry(&entry, cfg, "section2.name3"));
  
  	cl_git_pass(git_transaction_commit(tx));
  	git_transaction_free(tx);
  
  	/* Now that we've unlocked it, we should see both updates */
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
  	cl_assert_equal_s("other value", entry->value);
  	git_config_entry_free(entry);
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section2.name3"));
  	cl_assert_equal_s("more value", entry->value);
  	git_config_entry_free(entry);
  
  	git_config_free(cfg);
  
  	/* We should also see the changes after reopening the config */
  	cl_git_pass(git_config_open_ondisk(&cfg, filename));
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
  	cl_assert_equal_s("other value", entry->value);
  	git_config_entry_free(entry);
  	cl_git_pass(git_config_get_entry(&entry, cfg, "section2.name3"));
  	cl_assert_equal_s("more value", entry->value);
  	git_config_entry_free(entry);
  
  	git_config_free(cfg);
  }
  

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