thodg/libgit2/src/repository.c

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• Hash : 5f4a61ae
  Author :
  Date : 2012-08-09T19:43:25
  

  Working implementation of git_submodule_status This is a big redesign of the git_submodule_status API and the implementation of the redesigned API. It also fixes a number of bugs that I found in other parts of the submodule API while writing the tests for the status part. This also fixes a couple of bugs in the iterators that had not been noticed before - one with iterating when there is a gitlink (i.e. separate-work-dir) and one where I was treating anything even vaguely submodule-like as a submodule, more aggressively than core git does.

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• src/repository.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #include <stdarg.h>
  #include <ctype.h>
  
  #include "git2/object.h"
  
  #include "common.h"
  #include "repository.h"
  #include "commit.h"
  #include "tag.h"
  #include "blob.h"
  #include "fileops.h"
  #include "config.h"
  #include "refs.h"
  
  #define GIT_FILE_CONTENT_PREFIX "gitdir:"
  
  #define GIT_BRANCH_MASTER "master"
  
  #define GIT_REPO_VERSION 0
  
  #define GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  
  static void drop_odb(git_repository *repo)
  {
  	if (repo->_odb != NULL) {
  		GIT_REFCOUNT_OWN(repo->_odb, NULL);
  		git_odb_free(repo->_odb);
  		repo->_odb = NULL;
  	}
  }
  
  static void drop_config(git_repository *repo)
  {
  	if (repo->_config != NULL) {
  		GIT_REFCOUNT_OWN(repo->_config, NULL);
  		git_config_free(repo->_config);
  		repo->_config = NULL;
  	}
  
  	git_repository__cvar_cache_clear(repo);
  }
  
  static void drop_index(git_repository *repo)
  {
  	if (repo->_index != NULL) {
  		GIT_REFCOUNT_OWN(repo->_index, NULL);
  		git_index_free(repo->_index);
  		repo->_index = NULL;
  	}
  }
  
  void git_repository_free(git_repository *repo)
  {
  	if (repo == NULL)
  		return;
  
  	git_cache_free(&repo->objects);
  	git_repository__refcache_free(&repo->references);
  	git_attr_cache_flush(repo);
  	git_submodule_config_free(repo);
  
  	git__free(repo->path_repository);
  	git__free(repo->workdir);
  
  	drop_config(repo);
  	drop_index(repo);
  	drop_odb(repo);
  
  	git__free(repo);
  }
  
  /*
   * Git repository open methods
   *
   * Open a repository object from its path
   */
  static bool valid_repository_path(git_buf *repository_path)
  {
  	/* Check OBJECTS_DIR first, since it will generate the longest path name */
  	if (git_path_contains_dir(repository_path, GIT_OBJECTS_DIR) == false)
  		return false;
  
  	/* Ensure HEAD file exists */
  	if (git_path_contains_file(repository_path, GIT_HEAD_FILE) == false)
  		return false;
  
  	if (git_path_contains_dir(repository_path, GIT_REFS_DIR)  == false)
  		return false;
  
  	return true;
  }
  
  static git_repository *repository_alloc(void)
  {
  	git_repository *repo = git__malloc(sizeof(git_repository));
  	if (!repo)
  		return NULL;
  
  	memset(repo, 0x0, sizeof(git_repository));
  
  	if (git_cache_init(&repo->objects, GIT_DEFAULT_CACHE_SIZE, &git_object__free) < 0) {
  		git__free(repo);
  		return NULL;
  	}
  
  	/* set all the entries in the cvar cache to `unset` */
  	git_repository__cvar_cache_clear(repo);
  
  	return repo;
  }
  
  static int load_config_data(git_repository *repo)
  {
  	int is_bare;
  	git_config *config;
  
  	if (git_repository_config__weakptr(&config, repo) < 0)
  		return -1;
  
  	/* Try to figure out if it's bare, default to non-bare if it's not set */
  	if (git_config_get_bool(&is_bare, config, "core.bare") < 0)
  		repo->is_bare = 0;
  	else
  		repo->is_bare = is_bare;
  
  	return 0;
  }
  
  static int load_workdir(git_repository *repo, git_buf *parent_path)
  {
  	int         error;
  	git_config *config;
  	const char *worktree;
  	git_buf     worktree_buf = GIT_BUF_INIT;
  
  	if (repo->is_bare)
  		return 0;
  
  	if (git_repository_config__weakptr(&config, repo) < 0)
  		return -1;
  
  	error = git_config_get_string(&worktree, config, "core.worktree");
  	if (!error && worktree != NULL) {
  		error = git_path_prettify_dir(
  			&worktree_buf, worktree, repo->path_repository);
  		if (error < 0)
  			return error;
  		repo->workdir = git_buf_detach(&worktree_buf);
  	}
  	else if (error != GIT_ENOTFOUND)
  		return error;
  	else {
  		giterr_clear();
  
  		if (parent_path && git_path_isdir(parent_path->ptr))
  			repo->workdir = git_buf_detach(parent_path);
  		else {
  			git_path_dirname_r(&worktree_buf, repo->path_repository);
  			git_path_to_dir(&worktree_buf);
  			repo->workdir = git_buf_detach(&worktree_buf);
  		}
  	}
  
  	GITERR_CHECK_ALLOC(repo->workdir);
  
  	return 0;
  }
  
  /*
   * This function returns furthest offset into path where a ceiling dir
   * is found, so we can stop processing the path at that point.
   *
   * Note: converting this to use git_bufs instead of GIT_PATH_MAX buffers on
   * the stack could remove directories name limits, but at the cost of doing
   * repeated malloc/frees inside the loop below, so let's not do it now.
   */
  static int find_ceiling_dir_offset(
  	const char *path,
  	const char *ceiling_directories)
  {
  	char buf[GIT_PATH_MAX + 1];
  	char buf2[GIT_PATH_MAX + 1];
  	const char *ceil, *sep;
  	size_t len, max_len = 0, min_len;
  
  	assert(path);
  
  	min_len = (size_t)(git_path_root(path) + 1);
  
  	if (ceiling_directories == NULL || min_len == 0)
  		return (int)min_len;
  
  	for (sep = ceil = ceiling_directories; *sep; ceil = sep + 1) {
  		for (sep = ceil; *sep && *sep != GIT_PATH_LIST_SEPARATOR; sep++);
  		len = sep - ceil;
  
  		if (len == 0 || len >= sizeof(buf) || git_path_root(ceil) == -1)
  			continue;
  
  		strncpy(buf, ceil, len);
  		buf[len] = '\0';
  
  		if (p_realpath(buf, buf2) == NULL)
  			continue;
  
  		len = strlen(buf2);
  		if (len > 0 && buf2[len-1] == '/')
  			buf[--len] = '\0';
  
  		if (!strncmp(path, buf2, len) &&
  			path[len] == '/' &&
  			len > max_len)
  		{
  			max_len = len;
  		}
  	}
  
  	return (int)(max_len <= min_len ? min_len : max_len);
  }
  
  /*
   * Read the contents of `file_path` and set `path_out` to the repo dir that
   * it points to.  Before calling, set `path_out` to the base directory that
   * should be used if the contents of `file_path` are a relative path.
   */
  static int read_gitfile(git_buf *path_out, const char *file_path)
  {
  	int     error = 0;
  	git_buf file = GIT_BUF_INIT;
  	size_t  prefix_len = strlen(GIT_FILE_CONTENT_PREFIX);
  
  	assert(path_out && file_path);
  
  	if (git_futils_readbuffer(&file, file_path) < 0)
  		return -1;
  
  	git_buf_rtrim(&file);
  
  	if (git_buf_len(&file) <= prefix_len ||
  		memcmp(git_buf_cstr(&file), GIT_FILE_CONTENT_PREFIX, prefix_len) != 0)
  	{
  		giterr_set(GITERR_REPOSITORY, "The `.git` file at '%s' is malformed", file_path);
  		error = -1;
  	}
  	else if ((error = git_path_dirname_r(path_out, file_path)) >= 0) {
  		const char *gitlink = git_buf_cstr(&file) + prefix_len;
  		while (*gitlink && git__isspace(*gitlink)) gitlink++;
  		error = git_path_prettify_dir(
  			path_out, gitlink, git_buf_cstr(path_out));
  	}
  
  	git_buf_free(&file);
  	return error;
  }
  
  static int find_repo(
  	git_buf *repo_path,
  	git_buf *parent_path,
  	const char *start_path,
  	uint32_t flags,
  	const char *ceiling_dirs)
  {
  	int error;
  	git_buf path = GIT_BUF_INIT;
  	struct stat st;
  	dev_t initial_device = 0;
  	bool try_with_dot_git = false;
  	int ceiling_offset;
  
  	git_buf_free(repo_path);
  
  	if ((error = git_path_prettify_dir(&path, start_path, NULL)) < 0)
  		return error;
  
  	ceiling_offset = find_ceiling_dir_offset(path.ptr, ceiling_dirs);
  
  	if ((error = git_buf_joinpath(&path, path.ptr, DOT_GIT)) < 0)
  		return error;
  
  	while (!error && !git_buf_len(repo_path)) {
  		if (p_stat(path.ptr, &st) == 0) {
  			/* check that we have not crossed device boundaries */
  			if (initial_device == 0)
  				initial_device = st.st_dev;
  			else if (st.st_dev != initial_device &&
  				(flags & GIT_REPOSITORY_OPEN_CROSS_FS) == 0)
  				break;
  
  			if (S_ISDIR(st.st_mode)) {
  				if (valid_repository_path(&path)) {
  					git_path_to_dir(&path);
  					git_buf_set(repo_path, path.ptr, path.size);
  					break;
  				}
  			}
  			else if (S_ISREG(st.st_mode)) {
  				git_buf repo_link = GIT_BUF_INIT;
  
  				if (!(error = read_gitfile(&repo_link, path.ptr))) {
  					if (valid_repository_path(&repo_link))
  						git_buf_swap(repo_path, &repo_link);
  
  					git_buf_free(&repo_link);
  					break;
  				}
  				git_buf_free(&repo_link);
  			}
  		}
  
  		/* move up one directory level */
  		if (git_path_dirname_r(&path, path.ptr) < 0) {
  			error = -1;
  			break;
  		}
  
  		if (try_with_dot_git) {
  			/* if we tried original dir with and without .git AND either hit
  			 * directory ceiling or NO_SEARCH was requested, then be done.
  			 */
  			if (path.ptr[ceiling_offset] == '\0' ||
  				(flags & GIT_REPOSITORY_OPEN_NO_SEARCH) != 0)
  				break;
  			/* otherwise look first for .git item */
  			error = git_buf_joinpath(&path, path.ptr, DOT_GIT);
  		}
  		try_with_dot_git = !try_with_dot_git;
  	}
  
  	if (!error && parent_path != NULL) {
  		if (!git_buf_len(repo_path))
  			git_buf_clear(parent_path);
  		else {
  			git_path_dirname_r(parent_path, path.ptr);
  			git_path_to_dir(parent_path);
  		}
  		if (git_buf_oom(parent_path))
  			return -1;
  	}
  
  	git_buf_free(&path);
  
  	if (!git_buf_len(repo_path) && !error) {
  		giterr_set(GITERR_REPOSITORY,
  			"Could not find repository from '%s'", start_path);
  		error = GIT_ENOTFOUND;
  	}
  
  	return error;
  }
  
  int git_repository_open_ext(
  	git_repository **repo_ptr,
  	const char *start_path,
  	uint32_t flags,
  	const char *ceiling_dirs)
  {
  	int error;
  	git_buf path = GIT_BUF_INIT, parent = GIT_BUF_INIT;
  	git_repository *repo;
  
  	if (repo_ptr)
  		*repo_ptr = NULL;
  
  	error = find_repo(&path, &parent, start_path, flags, ceiling_dirs);
  	if (error < 0 || !repo_ptr)
  		return error;
  
  	repo = repository_alloc();
  	GITERR_CHECK_ALLOC(repo);
  
  	repo->path_repository = git_buf_detach(&path);
  	GITERR_CHECK_ALLOC(repo->path_repository);
  
  	if ((error = load_config_data(repo)) < 0 ||
  		(error = load_workdir(repo, &parent)) < 0)
  	{
  		git_repository_free(repo);
  		return error;
  	}
  
  	git_buf_free(&parent);
  	*repo_ptr = repo;
  	return 0;
  }
  
  int git_repository_open(git_repository **repo_out, const char *path)
  {
  	return git_repository_open_ext(
  		repo_out, path, GIT_REPOSITORY_OPEN_NO_SEARCH, NULL);
  }
  
  int git_repository_wrap_odb(git_repository **repo_out, git_odb *odb)
  {
  	git_repository *repo;
  
  	repo = repository_alloc();
  	GITERR_CHECK_ALLOC(repo);
  
  	git_repository_set_odb(repo, odb);
  	*repo_out = repo;
  
  	return 0;
  }
  
  int git_repository_discover(
  	char *repository_path,
  	size_t size,
  	const char *start_path,
  	int across_fs,
  	const char *ceiling_dirs)
  {
  	git_buf path = GIT_BUF_INIT;
  	uint32_t flags = across_fs ? GIT_REPOSITORY_OPEN_CROSS_FS : 0;
  	int error;
  
  	assert(start_path && repository_path && size > 0);
  
  	*repository_path = '\0';
  
  	if ((error = find_repo(&path, NULL, start_path, flags, ceiling_dirs)) < 0)
  		return error != GIT_ENOTFOUND ? -1 : error;
  
  	if (size < (size_t)(path.size + 1)) {
  		giterr_set(GITERR_REPOSITORY,
  			"The given buffer is too long to store the discovered path");
  		git_buf_free(&path);
  		return -1;
  	}
  
  	/* success: we discovered a repository */
  	git_buf_copy_cstr(repository_path, size, &path);
  	git_buf_free(&path);
  	return 0;
  }
  
  static int load_config(
  	git_config **out,
  	git_repository *repo,
  	const char *global_config_path,
  	const char *system_config_path)
  {
  	git_buf config_path = GIT_BUF_INIT;
  	git_config *cfg = NULL;
  
  	assert(repo && out);
  
  	if (git_config_new(&cfg) < 0)
  		return -1;
  
  	if (git_buf_joinpath(
  		&config_path, repo->path_repository, GIT_CONFIG_FILENAME_INREPO) < 0)
  		goto on_error;
  
  	if (git_config_add_file_ondisk(cfg, config_path.ptr, 3) < 0)
  		goto on_error;
  
  	git_buf_free(&config_path);
  
  	if (global_config_path != NULL) {
  		if (git_config_add_file_ondisk(cfg, global_config_path, 2) < 0)
  			goto on_error;
  	}
  
  	if (system_config_path != NULL) {
  		if (git_config_add_file_ondisk(cfg, system_config_path, 1) < 0)
  			goto on_error;
  	}
  
  	*out = cfg;
  	return 0;
  
  on_error:
  	git_buf_free(&config_path);
  	git_config_free(cfg);
  	*out = NULL;
  	return -1;
  }
  
  int git_repository_config__weakptr(git_config **out, git_repository *repo)
  {
  	if (repo->_config == NULL) {
  		git_buf global_buf = GIT_BUF_INIT, system_buf = GIT_BUF_INIT;
  		int res;
  
  		const char *global_config_path = NULL;
  		const char *system_config_path = NULL;
  
  		if (git_config_find_global_r(&global_buf) == 0)
  			global_config_path = global_buf.ptr;
  
  		if (git_config_find_system_r(&system_buf) == 0)
  			system_config_path = system_buf.ptr;
  
  		res = load_config(&repo->_config, repo, global_config_path, system_config_path);
  
  		git_buf_free(&global_buf);
  		git_buf_free(&system_buf);
  
  		if (res < 0)
  			return -1;
  
  		GIT_REFCOUNT_OWN(repo->_config, repo);
  	}
  
  	*out = repo->_config;
  	return 0;
  }
  
  int git_repository_config(git_config **out, git_repository *repo)
  {
  	if (git_repository_config__weakptr(out, repo) < 0)
  		return -1;
  
  	GIT_REFCOUNT_INC(*out);
  	return 0;
  }
  
  void git_repository_set_config(git_repository *repo, git_config *config)
  {
  	assert(repo && config);
  
  	drop_config(repo);
  
  	repo->_config = config;
  	GIT_REFCOUNT_OWN(repo->_config, repo);
  }
  
  int git_repository_odb__weakptr(git_odb **out, git_repository *repo)
  {
  	assert(repo && out);
  
  	if (repo->_odb == NULL) {
  		git_buf odb_path = GIT_BUF_INIT;
  		int res;
  
  		if (git_buf_joinpath(&odb_path, repo->path_repository, GIT_OBJECTS_DIR) < 0)
  			return -1;
  
  		res = git_odb_open(&repo->_odb, odb_path.ptr);
  		git_buf_free(&odb_path); /* done with path */
  
  		if (res < 0)
  			return -1;
  
  		GIT_REFCOUNT_OWN(repo->_odb, repo);
  	}
  
  	*out = repo->_odb;
  	return 0;
  }
  
  int git_repository_odb(git_odb **out, git_repository *repo)
  {
  	if (git_repository_odb__weakptr(out, repo) < 0)
  		return -1;
  
  	GIT_REFCOUNT_INC(*out);
  	return 0;
  }
  
  void git_repository_set_odb(git_repository *repo, git_odb *odb)
  {
  	assert(repo && odb);
  
  	drop_odb(repo);
  
  	repo->_odb = odb;
  	GIT_REFCOUNT_OWN(repo->_odb, repo);
  	GIT_REFCOUNT_INC(odb);
  }
  
  int git_repository_index__weakptr(git_index **out, git_repository *repo)
  {
  	assert(out && repo);
  
  	if (repo->_index == NULL) {
  		int res;
  		git_buf index_path = GIT_BUF_INIT;
  
  		if (git_buf_joinpath(&index_path, repo->path_repository, GIT_INDEX_FILE) < 0)
  			return -1;
  
  		res = git_index_open(&repo->_index, index_path.ptr);
  		git_buf_free(&index_path); /* done with path */
  
  		if (res < 0)
  			return -1;
  
  		GIT_REFCOUNT_OWN(repo->_index, repo);
  
  		if (git_index_set_caps(repo->_index, GIT_INDEXCAP_FROM_OWNER) < 0)
  			return -1;
  	}
  
  	*out = repo->_index;
  	return 0;
  }
  
  int git_repository_index(git_index **out, git_repository *repo)
  {
  	if (git_repository_index__weakptr(out, repo) < 0)
  		return -1;
  
  	GIT_REFCOUNT_INC(*out);
  	return 0;
  }
  
  void git_repository_set_index(git_repository *repo, git_index *index)
  {
  	assert(repo && index);
  
  	drop_index(repo);
  
  	repo->_index = index;
  	GIT_REFCOUNT_OWN(repo->_index, repo);
  	GIT_REFCOUNT_INC(index);
  }
  
  static int check_repositoryformatversion(git_config *config)
  {
  	int version;
  
  	if (git_config_get_int32(&version, config, "core.repositoryformatversion") < 0)
  		return -1;
  
  	if (GIT_REPO_VERSION < version) {
  		giterr_set(GITERR_REPOSITORY,
  			"Unsupported repository version %d. Only versions up to %d are supported.",
  			version, GIT_REPO_VERSION);
  		return -1;
  	}
  
  	return 0;
  }
  
  static int repo_init_create_head(const char *git_dir, const char *ref_name)
  {
  	git_buf ref_path = GIT_BUF_INIT;
  	git_filebuf ref = GIT_FILEBUF_INIT;
  	const char *fmt;
  
  	if (git_buf_joinpath(&ref_path, git_dir, GIT_HEAD_FILE) < 0 ||
  		git_filebuf_open(&ref, ref_path.ptr, 0) < 0)
  		goto fail;
  
  	if (!ref_name)
  		ref_name = GIT_BRANCH_MASTER;
  
  	if (git__prefixcmp(ref_name, "refs/") == 0)
  		fmt = "ref: %s\n";
  	else
  		fmt = "ref: refs/heads/%s\n";
  
  	if (git_filebuf_printf(&ref, fmt, ref_name) < 0 ||
  		git_filebuf_commit(&ref, GIT_REFS_FILE_MODE) < 0)
  		goto fail;
  
  	git_buf_free(&ref_path);
  	return 0;
  
  fail:
  	git_buf_free(&ref_path);
  	git_filebuf_cleanup(&ref);
  	return -1;
  }
  
  static bool is_chmod_supported(const char *file_path)
  {
  	struct stat st1, st2;
  	static int _is_supported = -1;
  
  	if (_is_supported > -1)
  		return _is_supported;
  
  	if (p_stat(file_path, &st1) < 0)
  		return false;
  
  	if (p_chmod(file_path, st1.st_mode ^ S_IXUSR) < 0)
  		return false;
  
  	if (p_stat(file_path, &st2) < 0)
  		return false;
  
  	_is_supported = (st1.st_mode != st2.st_mode);
  
  	return _is_supported;
  }
  
  static bool is_filesystem_case_insensitive(const char *gitdir_path)
  {
  	git_buf path = GIT_BUF_INIT;
  	static int _is_insensitive = -1;
  
  	if (_is_insensitive > -1)
  		return _is_insensitive;
  
  	if (git_buf_joinpath(&path, gitdir_path, "CoNfIg") < 0)
  		goto cleanup;
  
  	_is_insensitive = git_path_exists(git_buf_cstr(&path));
  
  cleanup:
  	git_buf_free(&path);
  	return _is_insensitive;
  }
  
  static bool are_symlinks_supported(const char *wd_path)
  {
  	git_buf path = GIT_BUF_INIT;
  	int fd;
  	struct stat st;
  	static int _symlinks_supported = -1;
  
  	if (_symlinks_supported > -1)
  		return _symlinks_supported;
  
  	if ((fd = git_futils_mktmp(&path, wd_path)) < 0 ||
  		p_close(fd) < 0 ||
  		p_unlink(path.ptr) < 0 ||
  		p_symlink("testing", path.ptr) < 0 ||
  		p_lstat(path.ptr, &st) < 0)
  		_symlinks_supported = false;
  	else
  		_symlinks_supported = (S_ISLNK(st.st_mode) != 0);
  
  	(void)p_unlink(path.ptr);
  	git_buf_free(&path);
  
  	return _symlinks_supported;
  }
  
  static int repo_init_config(
  	const char *repo_dir,
  	const char *work_dir,
  	git_repository_init_options *opts)
  {
  	int error = 0;
  	git_buf cfg_path = GIT_BUF_INIT;
  	git_config *config = NULL;
  
  #define SET_REPO_CONFIG(TYPE, NAME, VAL) do {\
  	if ((error = git_config_set_##TYPE(config, NAME, VAL)) < 0) \
  		goto cleanup; } while (0)
  
  	if (git_buf_joinpath(&cfg_path, repo_dir, GIT_CONFIG_FILENAME_INREPO) < 0)
  		return -1;
  
  	if (git_config_open_ondisk(&config, git_buf_cstr(&cfg_path)) < 0) {
  		git_buf_free(&cfg_path);
  		return -1;
  	}
  
  	if ((opts->flags & GIT_REPOSITORY_INIT__IS_REINIT) != 0 &&
  		(error = check_repositoryformatversion(config)) < 0)
  		goto cleanup;
  
  	SET_REPO_CONFIG(
  		bool, "core.bare", (opts->flags & GIT_REPOSITORY_INIT_BARE) != 0);
  	SET_REPO_CONFIG(
  		int32, "core.repositoryformatversion", GIT_REPO_VERSION);
  	SET_REPO_CONFIG(
  		bool, "core.filemode", is_chmod_supported(git_buf_cstr(&cfg_path)));
  
  	if (!(opts->flags & GIT_REPOSITORY_INIT_BARE)) {
  		SET_REPO_CONFIG(bool, "core.logallrefupdates", true);
  
  		if (!are_symlinks_supported(work_dir))
  			SET_REPO_CONFIG(bool, "core.symlinks", false);
  
  		if (!(opts->flags & GIT_REPOSITORY_INIT__NATURAL_WD)) {
  			SET_REPO_CONFIG(string, "core.worktree", work_dir);
  		}
  		else if ((opts->flags & GIT_REPOSITORY_INIT__IS_REINIT) != 0) {
  			if ((error = git_config_delete(config, "core.worktree")) < 0)
  				goto cleanup;
  		}
  	} else {
  		if (!are_symlinks_supported(repo_dir))
  			SET_REPO_CONFIG(bool, "core.symlinks", false);
  	}
  
  	if (!(opts->flags & GIT_REPOSITORY_INIT__IS_REINIT) &&
  		is_filesystem_case_insensitive(repo_dir))
  		SET_REPO_CONFIG(bool, "core.ignorecase", true);
  
  	if (opts->mode == GIT_REPOSITORY_INIT_SHARED_GROUP) {
  		SET_REPO_CONFIG(int32, "core.sharedrepository", 1);
  		SET_REPO_CONFIG(bool, "receive.denyNonFastforwards", true);
  	}
  	else if (opts->mode == GIT_REPOSITORY_INIT_SHARED_ALL) {
  		SET_REPO_CONFIG(int32, "core.sharedrepository", 2);
  		SET_REPO_CONFIG(bool, "receive.denyNonFastforwards", true);
  	}
  
  cleanup:
  	git_buf_free(&cfg_path);
  	git_config_free(config);
  
  	return error;
  }
  
  static int repo_write_template(
  	const char *git_dir,
  	bool allow_overwrite,
  	const char *file,
  	mode_t mode,
  	bool hidden,
  	const char *content)
  {
  	git_buf path = GIT_BUF_INIT;
  	int fd, error = 0, flags;
  
  	if (git_buf_joinpath(&path, git_dir, file) < 0)
  		return -1;
  
  	if (allow_overwrite)
  		flags = O_WRONLY | O_CREAT | O_TRUNC;
  	else
  		flags = O_WRONLY | O_CREAT | O_EXCL;
  
  	fd = p_open(git_buf_cstr(&path), flags, mode);
  
  	if (fd >= 0) {
  		error = p_write(fd, content, strlen(content));
  
  		p_close(fd);
  	}
  	else if (errno != EEXIST)
  		error = fd;
  
  #ifdef GIT_WIN32
  	if (!error && hidden) {
  		if (p_hide_directory__w32(path.ptr) < 0)
  			error = -1;
  	}
  #else
  	GIT_UNUSED(hidden);
  #endif
  
  	git_buf_free(&path);
  
  	if (error)
  		giterr_set(GITERR_OS,
  			"Failed to initialize repository with template '%s'", file);
  
  	return error;
  }
  
  static int repo_write_gitlink(
  	const char *in_dir, const char *to_repo)
  {
  	int error;
  	git_buf buf = GIT_BUF_INIT;
  	struct stat st;
  
  	git_path_dirname_r(&buf, to_repo);
  	git_path_to_dir(&buf);
  	if (git_buf_oom(&buf))
  		return -1;
  
  	/* don't write gitlink to natural workdir */
  	if (git__suffixcmp(to_repo, "/" DOT_GIT "/") == 0 &&
  		strcmp(in_dir, buf.ptr) == 0)
  	{
  		error = GIT_PASSTHROUGH;
  		goto cleanup;
  	}
  
  	if ((error = git_buf_joinpath(&buf, in_dir, DOT_GIT)) < 0)
  		goto cleanup;
  
  	if (!p_stat(buf.ptr, &st) && !S_ISREG(st.st_mode)) {
  		giterr_set(GITERR_REPOSITORY,
  			"Cannot overwrite gitlink file into path '%s'", in_dir);
  		error = GIT_EEXISTS;
  		goto cleanup;
  	}
  
  	git_buf_clear(&buf);
  
  	error = git_buf_printf(&buf, "%s %s", GIT_FILE_CONTENT_PREFIX, to_repo);
  
  	if (!error)
  		error = repo_write_template(in_dir, true, DOT_GIT, 0644, true, buf.ptr);
  
  cleanup:
  	git_buf_free(&buf);
  	return error;
  }
  
  static mode_t pick_dir_mode(git_repository_init_options *opts)
  {
  	if (opts->mode == GIT_REPOSITORY_INIT_SHARED_UMASK)
  		return 0755;
  	if (opts->mode == GIT_REPOSITORY_INIT_SHARED_GROUP)
  		return (0775 | S_ISGID);
  	if (opts->mode == GIT_REPOSITORY_INIT_SHARED_ALL)
  		return (0777 | S_ISGID);
  	return opts->mode;
  }
  
  #include "repo_template.h"
  
  static int repo_init_structure(
  	const char *repo_dir,
  	const char *work_dir,
  	git_repository_init_options *opts)
  {
  	int error = 0;
  	repo_template_item *tpl;
  	bool external_tpl =
  		((opts->flags & GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE) != 0);
  	mode_t dmode = pick_dir_mode(opts);
  
  	/* Hide the ".git" directory */
  #ifdef GIT_WIN32
  	if ((opts->flags & GIT_REPOSITORY_INIT__HAS_DOTGIT) != 0) {
  		if (p_hide_directory__w32(repo_dir) < 0) {
  			giterr_set(GITERR_REPOSITORY,
  				"Failed to mark Git repository folder as hidden");
  			return -1;
  		}
  	}
  #endif
  
  	/* Create the .git gitlink if appropriate */
  	if ((opts->flags & GIT_REPOSITORY_INIT_BARE) == 0 &&
  		(opts->flags & GIT_REPOSITORY_INIT__NATURAL_WD) == 0)
  	{
  		if (repo_write_gitlink(work_dir, repo_dir) < 0)
  			return -1;
  	}
  
  	/* Copy external template if requested */
  	if (external_tpl) {
  		git_config *cfg;
  		const char *tdir;
  
  		if (opts->template_path)
  			tdir = opts->template_path;
  		else if ((error = git_config_open_default(&cfg)) < 0)
  			return error;
  		else {
  			error = git_config_get_string(&tdir, cfg, "init.templatedir");
  
  			git_config_free(cfg);
  
  			if (error && error != GIT_ENOTFOUND)
  				return error;
  
  			giterr_clear();
  			tdir = GIT_TEMPLATE_DIR;
  		}
  
  		error = git_futils_cp_r(tdir, repo_dir,
  			GIT_CPDIR_COPY_SYMLINKS | GIT_CPDIR_CHMOD, dmode);
  
  		if (error < 0) {
  			if (strcmp(tdir, GIT_TEMPLATE_DIR) != 0)
  				return error;
  
  			/* if template was default, ignore error and use internal */
  			giterr_clear();
  			external_tpl = false;
  		}
  	}
  
  	/* Copy internal template
  	 * - always ensure existence of dirs
  	 * - only create files if no external template was specified
  	 */
  	for (tpl = repo_template; !error && tpl->path; ++tpl) {
  		if (!tpl->content)
  			error = git_futils_mkdir(
  				tpl->path, repo_dir, dmode, GIT_MKDIR_PATH | GIT_MKDIR_CHMOD);
  		else if (!external_tpl) {
  			const char *content = tpl->content;
  
  			if (opts->description && strcmp(tpl->path, GIT_DESC_FILE) == 0)
  				content = opts->description;
  
  			error = repo_write_template(
  				repo_dir, false, tpl->path, tpl->mode, false, content);
  		}
  	}
  
  	return error;
  }
  
  static int repo_init_directories(
  	git_buf *repo_path,
  	git_buf *wd_path,
  	const char *given_repo,
  	git_repository_init_options *opts)
  {
  	int error = 0;
  	bool add_dotgit, has_dotgit, natural_wd;
  	mode_t dirmode;
  
  	/* set up repo path */
  
  	add_dotgit =
  		(opts->flags & GIT_REPOSITORY_INIT_NO_DOTGIT_DIR) == 0 &&
  		(opts->flags & GIT_REPOSITORY_INIT_BARE) == 0 &&
  		git__suffixcmp(given_repo, "/" DOT_GIT) != 0 &&
  		git__suffixcmp(given_repo, "/" GIT_DIR) != 0;
  
  	if (git_buf_joinpath(repo_path, given_repo, add_dotgit ? GIT_DIR : "") < 0)
  		return -1;
  
  	has_dotgit = (git__suffixcmp(repo_path->ptr, "/" GIT_DIR) == 0);
  	if (has_dotgit)
  		opts->flags |= GIT_REPOSITORY_INIT__HAS_DOTGIT;
  
  	/* set up workdir path */
  
  	if ((opts->flags & GIT_REPOSITORY_INIT_BARE) == 0) {
  		if (opts->workdir_path) {
  			if (git_path_join_unrooted(
  					wd_path, opts->workdir_path, repo_path->ptr, NULL) < 0)
  				return -1;
  		} else if (has_dotgit) {
  			if (git_path_dirname_r(wd_path, repo_path->ptr) < 0)
  				return -1;
  		} else {
  			giterr_set(GITERR_REPOSITORY, "Cannot pick working directory"
  				" for non-bare repository that isn't a '.git' directory");
  			return -1;
  		}
  
  		if (git_path_to_dir(wd_path) < 0)
  			return -1;
  	} else {
  		git_buf_clear(wd_path);
  	}
  
  	natural_wd =
  		has_dotgit &&
  		wd_path->size > 0 &&
  		wd_path->size + strlen(GIT_DIR) == repo_path->size &&
  		memcmp(repo_path->ptr, wd_path->ptr, wd_path->size) == 0;
  	if (natural_wd)
  		opts->flags |= GIT_REPOSITORY_INIT__NATURAL_WD;
  
  	/* create directories as needed / requested */
  
  	dirmode = pick_dir_mode(opts);
  
  	if ((opts->flags & GIT_REPOSITORY_INIT_MKDIR) != 0 && has_dotgit) {
  		git_buf p = GIT_BUF_INIT;
  		if ((error = git_path_dirname_r(&p, repo_path->ptr)) >= 0)
  			error = git_futils_mkdir(p.ptr, NULL, dirmode, 0);
  		git_buf_free(&p);
  	}
  
  	if ((opts->flags & GIT_REPOSITORY_INIT_MKDIR) != 0 ||
  		(opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0 ||
  		has_dotgit)
  	{
  		uint32_t mkflag = GIT_MKDIR_CHMOD;
  		if ((opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0)
  			mkflag |= GIT_MKDIR_PATH;
  		error = git_futils_mkdir(repo_path->ptr, NULL, dirmode, mkflag);
  	}
  
  	if (wd_path->size > 0 &&
  		!natural_wd &&
  		((opts->flags & GIT_REPOSITORY_INIT_MKDIR) != 0 ||
  		 (opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0))
  		error = git_futils_mkdir(wd_path->ptr, NULL, dirmode & ~S_ISGID,
  			(opts->flags & GIT_REPOSITORY_INIT_MKPATH) ? GIT_MKDIR_PATH : 0);
  
  	/* prettify both directories now that they are created */
  
  	if (!error) {
  		error = git_path_prettify_dir(repo_path, repo_path->ptr, NULL);
  
  		if (!error && wd_path->size > 0)
  			error = git_path_prettify_dir(wd_path, wd_path->ptr, NULL);
  	}
  
  	return error;
  }
  
  static int repo_init_create_origin(git_repository *repo, const char *url)
  {
  	int error;
  	git_remote *remote;
  
  	if (!(error = git_remote_add(&remote, repo, "origin", url))) {
  		error = git_remote_save(remote);
  		git_remote_free(remote);
  	}
  
  	return error;
  }
  
  int git_repository_init(
  	git_repository **repo_out, const char *path, unsigned is_bare)
  {
  	git_repository_init_options opts;
  
  	memset(&opts, 0, sizeof(opts));
  	opts.flags = GIT_REPOSITORY_INIT_MKPATH; /* don't love this default */
  	if (is_bare)
  		opts.flags |= GIT_REPOSITORY_INIT_BARE;
  
  	return git_repository_init_ext(repo_out, path, &opts);
  }
  
  int git_repository_init_ext(
  	git_repository **repo_out,
  	const char *given_repo,
  	git_repository_init_options *opts)
  {
  	int error;
  	git_buf repo_path = GIT_BUF_INIT, wd_path = GIT_BUF_INIT;
  
  	assert(repo_out && given_repo && opts);
  
  	error = repo_init_directories(&repo_path, &wd_path, given_repo, opts);
  	if (error < 0)
  		goto cleanup;
  
  	if (valid_repository_path(&repo_path)) {
  
  		if ((opts->flags & GIT_REPOSITORY_INIT_NO_REINIT) != 0) {
  			giterr_set(GITERR_REPOSITORY,
  				"Attempt to reinitialize '%s'", given_repo);
  			error = GIT_EEXISTS;
  			goto cleanup;
  		}
  
  		opts->flags |= GIT_REPOSITORY_INIT__IS_REINIT;
  
  		error = repo_init_config(
  			git_buf_cstr(&repo_path), git_buf_cstr(&wd_path), opts);
  
  		/* TODO: reinitialize the templates */
  	}
  	else {
  		if (!(error = repo_init_structure(
  				git_buf_cstr(&repo_path), git_buf_cstr(&wd_path), opts)) &&
  			!(error = repo_init_config(
  				git_buf_cstr(&repo_path), git_buf_cstr(&wd_path), opts)))
  			error = repo_init_create_head(
  				git_buf_cstr(&repo_path), opts->initial_head);
  	}
  	if (error < 0)
  		goto cleanup;
  
  	error = git_repository_open(repo_out, git_buf_cstr(&repo_path));
  
  	if (!error && opts->origin_url)
  		error = repo_init_create_origin(*repo_out, opts->origin_url);
  
  cleanup:
  	git_buf_free(&repo_path);
  	git_buf_free(&wd_path);
  
  	return error;
  }
  
  int git_repository_head_detached(git_repository *repo)
  {
  	git_reference *ref;
  	git_odb *odb = NULL;
  	int exists;
  
  	if (git_repository_odb__weakptr(&odb, repo) < 0)
  		return -1;
  
  	if (git_reference_lookup(&ref, repo, GIT_HEAD_FILE) < 0)
  		return -1;
  
  	if (git_reference_type(ref) == GIT_REF_SYMBOLIC) {
  		git_reference_free(ref);
  		return 0;
  	}
  
  	exists = git_odb_exists(odb, git_reference_oid(ref));
  
  	git_reference_free(ref);
  	return exists;
  }
  
  int git_repository_head(git_reference **head_out, git_repository *repo)
  {
  	return git_reference_lookup_resolved(head_out, repo, GIT_HEAD_FILE, -1);
  }
  
  int git_repository_head_orphan(git_repository *repo)
  {
  	git_reference *ref = NULL;
  	int error;
  
  	error = git_repository_head(&ref, repo);
  	git_reference_free(ref);
  
  	if (error == GIT_ENOTFOUND)
  		return 1;
  
  	if (error < 0)
  		return -1;
  
  	return 0;
  }
  
  int git_repository_is_empty(git_repository *repo)
  {
  	git_reference *head = NULL, *branch = NULL;
  	int error;
  
  	if (git_reference_lookup(&head, repo, "HEAD") < 0)
  		return -1;
  
  	if (git_reference_type(head) != GIT_REF_SYMBOLIC) {
  		git_reference_free(head);
  		return 0;
  	}
  
  	if (strcmp(git_reference_target(head), "refs/heads/master") != 0) {
  		git_reference_free(head);
  		return 0;
  	}
  
  	error = git_reference_resolve(&branch, head);
  
  	git_reference_free(head);
  	git_reference_free(branch);
  
  	if (error == GIT_ENOTFOUND)
  		return 1;
  
  	if (error < 0)
  		return -1;
  
  	return 0;
  }
  
  const char *git_repository_path(git_repository *repo)
  {
  	assert(repo);
  	return repo->path_repository;
  }
  
  const char *git_repository_workdir(git_repository *repo)
  {
  	assert(repo);
  
  	if (repo->is_bare)
  		return NULL;
  
  	return repo->workdir;
  }
  
  int git_repository_set_workdir(
  	git_repository *repo, const char *workdir, int update_gitlink)
  {
  	int error = 0;
  	git_buf path = GIT_BUF_INIT;
  
  	assert(repo && workdir);
  
  	if (git_path_prettify_dir(&path, workdir, NULL) < 0)
  		return -1;
  
  	if (repo->workdir && strcmp(repo->workdir, path.ptr) == 0)
  		return 0;
  
  	if (update_gitlink) {
  		git_config *config;
  
  		if (git_repository_config__weakptr(&config, repo) < 0)
  			return -1;
  
  		error = repo_write_gitlink(path.ptr, git_repository_path(repo));
  
  		/* passthrough error means gitlink is unnecessary */
  		if (error == GIT_PASSTHROUGH)
  			error = git_config_delete(config, "core.worktree");
  		else if (!error)
  			error = git_config_set_string(config, "core.worktree", path.ptr);
  
  		if (!error)
  			error = git_config_set_bool(config, "core.bare", false);
  	}
  
  	if (!error) {
  		char *old_workdir = repo->workdir;
  
  		repo->workdir = git_buf_detach(&path);
  		repo->is_bare = 0;
  
  		git__free(old_workdir);
  	}
  
  	return error;
  }
  
  int git_repository_is_bare(git_repository *repo)
  {
  	assert(repo);
  	return repo->is_bare;
  }
  
  int git_repository_head_tree(git_tree **tree, git_repository *repo)
  {
  	git_oid head_oid;
  	git_object *obj = NULL;
  
  	if (git_reference_name_to_oid(&head_oid, repo, GIT_HEAD_FILE) < 0) {
  		/* cannot resolve HEAD - probably brand new repo */
  		giterr_clear();
  		*tree = NULL;
  		return 0;
  	}
  
  	if (git_object_lookup(&obj, repo, &head_oid, GIT_OBJ_ANY) < 0 ||
  		git_object__resolve_to_type(&obj, GIT_OBJ_TREE) < 0)
  		return -1;
  
  	*tree = (git_tree *)obj;
  	return 0;
  }
  
  #define MERGE_MSG_FILE "MERGE_MSG"
  
  int git_repository_message(char *buffer, size_t len, git_repository *repo)
  {
  	git_buf buf = GIT_BUF_INIT, path = GIT_BUF_INIT;
  	struct stat st;
  	int error;
  
  	if (git_buf_joinpath(&path, repo->path_repository, MERGE_MSG_FILE) < 0)
  		return -1;
  
  	if ((error = p_stat(git_buf_cstr(&path), &st)) < 0) {
  		if (errno == ENOENT)
  			error = GIT_ENOTFOUND;
  	}
  	else if (buffer != NULL) {
  		error = git_futils_readbuffer(&buf, git_buf_cstr(&path));
  		git_buf_copy_cstr(buffer, len, &buf);
  	}
  
  	git_buf_free(&path);
  	git_buf_free(&buf);
  
  	if (!error)
  		error = (int)st.st_size + 1; /* add 1 for NUL byte */
  
  	return error;
  }
  
  int git_repository_message_remove(git_repository *repo)
  {
  	git_buf path = GIT_BUF_INIT;
  	int error;
  
  	if (git_buf_joinpath(&path, repo->path_repository, MERGE_MSG_FILE) < 0)
  		return -1;
  
  	error = p_unlink(git_buf_cstr(&path));
  	git_buf_free(&path);
  
  	return error;
  }
  

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