thodg/libgit2/src/attr_file.c

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• Hash : 5c54e216
  Author :
  Date : 2014-11-05T16:07:07
  

  ignore: consider files with a CR in their names We currently consider CR to start the end of the line, but that means that we miss cases with CR CR LF which can be used with git to match files whose names have CR at the end of their names. The fix from the patch comes from Russell's comment in the issue. This fixes #2536.

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• src/attr_file.c

• #include "common.h"
  #include "repository.h"
  #include "filebuf.h"
  #include "attr_file.h"
  #include "attrcache.h"
  #include "git2/blob.h"
  #include "git2/tree.h"
  #include "index.h"
  #include <ctype.h>
  
  static void attr_file_free(git_attr_file *file)
  {
  	bool unlock = !git_mutex_lock(&file->lock);
  	git_attr_file__clear_rules(file, false);
  	git_pool_clear(&file->pool);
  	if (unlock)
  		git_mutex_unlock(&file->lock);
  	git_mutex_free(&file->lock);
  
  	git__memzero(file, sizeof(*file));
  	git__free(file);
  }
  
  int git_attr_file__new(
  	git_attr_file **out,
  	git_attr_file_entry *entry,
  	git_attr_file_source source)
  {
  	git_attr_file *attrs = git__calloc(1, sizeof(git_attr_file));
  	GITERR_CHECK_ALLOC(attrs);
  
  	if (git_mutex_init(&attrs->lock) < 0) {
  		giterr_set(GITERR_OS, "Failed to initialize lock");
  		git__free(attrs);
  		return -1;
  	}
  
  	if (git_pool_init(&attrs->pool, 1, 0) < 0) {
  		attr_file_free(attrs);
  		return -1;
  	}
  
  	GIT_REFCOUNT_INC(attrs);
  	attrs->entry  = entry;
  	attrs->source = source;
  	*out = attrs;
  	return 0;
  }
  
  int git_attr_file__clear_rules(git_attr_file *file, bool need_lock)
  {
  	unsigned int i;
  	git_attr_rule *rule;
  
  	if (need_lock && git_mutex_lock(&file->lock) < 0) {
  		giterr_set(GITERR_OS, "Failed to lock attribute file");
  		return -1;
  	}
  
  	git_vector_foreach(&file->rules, i, rule)
  		git_attr_rule__free(rule);
  	git_vector_free(&file->rules);
  
  	if (need_lock)
  		git_mutex_unlock(&file->lock);
  
  	return 0;
  }
  
  void git_attr_file__free(git_attr_file *file)
  {
  	if (!file)
  		return;
  	GIT_REFCOUNT_DEC(file, attr_file_free);
  }
  
  static int attr_file_oid_from_index(
  	git_oid *oid, git_repository *repo, const char *path)
  {
  	int error;
  	git_index *idx;
  	size_t pos;
  	const git_index_entry *entry;
  
  	if ((error = git_repository_index__weakptr(&idx, repo)) < 0 ||
  		(error = git_index__find_pos(&pos, idx, path, 0, 0)) < 0)
  		return error;
  
  	if (!(entry = git_index_get_byindex(idx, pos)))
  		return GIT_ENOTFOUND;
  
  	*oid = entry->id;
  	return 0;
  }
  
  int git_attr_file__load(
  	git_attr_file **out,
  	git_repository *repo,
  	git_attr_file_entry *entry,
  	git_attr_file_source source,
  	git_attr_file_parser parser)
  {
  	int error = 0;
  	git_blob *blob = NULL;
  	git_buf content = GIT_BUF_INIT;
  	const char *data = NULL;
  	git_attr_file *file;
  	struct stat st;
  
  	*out = NULL;
  
  	switch (source) {
  	case GIT_ATTR_FILE__IN_MEMORY:
  		/* in-memory attribute file doesn't need data */
  		break;
  	case GIT_ATTR_FILE__FROM_INDEX: {
  		git_oid id;
  
  		if ((error = attr_file_oid_from_index(&id, repo, entry->path)) < 0 ||
  			(error = git_blob_lookup(&blob, repo, &id)) < 0)
  			return error;
  
  		data = git_blob_rawcontent(blob);
  		break;
  	}
  	case GIT_ATTR_FILE__FROM_FILE: {
  		int fd;
  
  		if (p_stat(entry->fullpath, &st) < 0)
  			return git_path_set_error(errno, entry->fullpath, "stat");
  		if (S_ISDIR(st.st_mode))
  			return GIT_ENOTFOUND;
  
  		/* For open or read errors, return ENOTFOUND to skip item */
  		/* TODO: issue warning when warning API is available */
  
  		if ((fd = git_futils_open_ro(entry->fullpath)) < 0)
  			return GIT_ENOTFOUND;
  
  		error = git_futils_readbuffer_fd(&content, fd, (size_t)st.st_size);
  		p_close(fd);
  
  		if (error < 0)
  			return GIT_ENOTFOUND;
  
  		data = content.ptr;
  		break;
  	}
  	default:
  		giterr_set(GITERR_INVALID, "Unknown file source %d", source);
  		return -1;
  	}
  
  	if ((error = git_attr_file__new(&file, entry, source)) < 0)
  		goto cleanup;
  
  	if (parser && (error = parser(repo, file, data)) < 0) {
  		git_attr_file__free(file);
  		goto cleanup;
  	}
  
  	/* write cache breaker */
  	if (source == GIT_ATTR_FILE__FROM_INDEX)
  		git_oid_cpy(&file->cache_data.oid, git_blob_id(blob));
  	else if (source == GIT_ATTR_FILE__FROM_FILE)
  		git_futils_filestamp_set_from_stat(&file->cache_data.stamp, &st);
  	/* else always cacheable */
  
  	*out = file;
  
  cleanup:
  	git_blob_free(blob);
  	git_buf_free(&content);
  
  	return error;
  }
  
  int git_attr_file__out_of_date(git_repository *repo, git_attr_file *file)
  {
  	if (!file)
  		return 1;
  
  	switch (file->source) {
  	case GIT_ATTR_FILE__IN_MEMORY:
  		return 0;
  
  	case GIT_ATTR_FILE__FROM_FILE:
  		return git_futils_filestamp_check(
  			&file->cache_data.stamp, file->entry->fullpath);
  
  	case GIT_ATTR_FILE__FROM_INDEX: {
  		int error;
  		git_oid id;
  
  		if ((error = attr_file_oid_from_index(
  				&id, repo, file->entry->path)) < 0)
  			return error;
  
  		return (git_oid__cmp(&file->cache_data.oid, &id) != 0);
  	}
  
  	default:
  		giterr_set(GITERR_INVALID, "Invalid file type %d", file->source);
  		return -1;
  	}
  }
  
  static int sort_by_hash_and_name(const void *a_raw, const void *b_raw);
  static void git_attr_rule__clear(git_attr_rule *rule);
  static bool parse_optimized_patterns(
  	git_attr_fnmatch *spec,
  	git_pool *pool,
  	const char *pattern);
  
  int git_attr_file__parse_buffer(
  	git_repository *repo, git_attr_file *attrs, const char *data)
  {
  	int error = 0;
  	const char *scan = data, *context = NULL;
  	git_attr_rule *rule = NULL;
  
  	/* if subdir file path, convert context for file paths */
  	if (attrs->entry &&
  		git_path_root(attrs->entry->path) < 0 &&
  		!git__suffixcmp(attrs->entry->path, "/" GIT_ATTR_FILE))
  		context = attrs->entry->path;
  
  	if (git_mutex_lock(&attrs->lock) < 0) {
  		giterr_set(GITERR_OS, "Failed to lock attribute file");
  		return -1;
  	}
  
  	while (!error && *scan) {
  		/* allocate rule if needed */
  		if (!rule && !(rule = git__calloc(1, sizeof(*rule)))) {
  			error = -1;
  			break;
  		}
  
  		rule->match.flags =
  			GIT_ATTR_FNMATCH_ALLOWNEG | GIT_ATTR_FNMATCH_ALLOWMACRO;
  
  		/* parse the next "pattern attr attr attr" line */
  		if (!(error = git_attr_fnmatch__parse(
  				&rule->match, &attrs->pool, context, &scan)) &&
  			!(error = git_attr_assignment__parse(
  				repo, &attrs->pool, &rule->assigns, &scan)))
  		{
  			if (rule->match.flags & GIT_ATTR_FNMATCH_MACRO)
  				/* TODO: warning if macro found in file below repo root */
  				error = git_attr_cache__insert_macro(repo, rule);
  			else
  				error = git_vector_insert(&attrs->rules, rule);
  		}
  
  		/* if the rule wasn't a pattern, on to the next */
  		if (error < 0) {
  			git_attr_rule__clear(rule); /* reset rule contents */
  			if (error == GIT_ENOTFOUND)
  				error = 0;
  		} else {
  			rule = NULL; /* vector now "owns" the rule */
  		}
  	}
  
  	git_mutex_unlock(&attrs->lock);
  	git_attr_rule__free(rule);
  
  	return error;
  }
  
  uint32_t git_attr_file__name_hash(const char *name)
  {
  	uint32_t h = 5381;
  	int c;
  	assert(name);
  	while ((c = (int)*name++) != 0)
  		h = ((h << 5) + h) + c;
  	return h;
  }
  
  int git_attr_file__lookup_one(
  	git_attr_file *file,
  	git_attr_path *path,
  	const char *attr,
  	const char **value)
  {
  	size_t i;
  	git_attr_name name;
  	git_attr_rule *rule;
  
  	*value = NULL;
  
  	name.name = attr;
  	name.name_hash = git_attr_file__name_hash(attr);
  
  	git_attr_file__foreach_matching_rule(file, path, i, rule) {
  		size_t pos;
  
  		if (!git_vector_bsearch(&pos, &rule->assigns, &name)) {
  			*value = ((git_attr_assignment *)
  					  git_vector_get(&rule->assigns, pos))->value;
  			break;
  		}
  	}
  
  	return 0;
  }
  
  int git_attr_file__load_standalone(git_attr_file **out, const char *path)
  {
  	int error;
  	git_attr_file *file;
  	git_buf content = GIT_BUF_INIT;
  
  	error = git_attr_file__new(&file, NULL, GIT_ATTR_FILE__FROM_FILE);
  	if (error < 0)
  		return error;
  
  	error = git_attr_cache__alloc_file_entry(
  		&file->entry, NULL, path, &file->pool);
  	if (error < 0) {
  		git_attr_file__free(file);
  		return error;
  	}
  	/* because the cache entry is allocated from the file's own pool, we
  	 * don't have to free it - freeing file+pool will free cache entry, too.
  	 */
  
  	if (!(error = git_futils_readbuffer(&content, path))) {
  		error = git_attr_file__parse_buffer(NULL, file, content.ptr);
  		git_buf_free(&content);
  	}
  
  	if (error < 0)
  		git_attr_file__free(file);
  	else
  		*out = file;
  
  	return error;
  }
  
  bool git_attr_fnmatch__match(
  	git_attr_fnmatch *match,
  	git_attr_path *path)
  {
  	const char *filename;
  	int flags = 0;
  
  	if (match->flags & GIT_ATTR_FNMATCH_ICASE)
  		flags |= FNM_CASEFOLD;
  	if (match->flags & GIT_ATTR_FNMATCH_LEADINGDIR)
  		flags |= FNM_LEADING_DIR;
  
  	if (match->flags & GIT_ATTR_FNMATCH_FULLPATH) {
  		filename = path->path;
  		flags |= FNM_PATHNAME;
  	} else {
  		filename = path->basename;
  
  		if (path->is_dir)
  			flags |= FNM_LEADING_DIR;
  	}
  
  	if ((match->flags & GIT_ATTR_FNMATCH_DIRECTORY) && !path->is_dir) {
  		int matchval;
  
  		/* for attribute checks or root ignore checks, fail match */
  		if (!(match->flags & GIT_ATTR_FNMATCH_IGNORE) ||
  			path->basename == path->path)
  			return false;
  
  		/* for ignore checks, use container of current item for check */
  		path->basename[-1] = '\0';
  		flags |= FNM_LEADING_DIR;
  		matchval = p_fnmatch(match->pattern, path->path, flags);
  		path->basename[-1] = '/';
  		return (matchval != FNM_NOMATCH);
  	}
  
  	/* if path is a directory prefix of a negated pattern, then match */
  	if ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) && path->is_dir) {
  		size_t pathlen = strlen(path->path);
  		bool prefixed = (pathlen <= match->length) &&
  			((match->flags & GIT_ATTR_FNMATCH_ICASE) ?
  			 !strncasecmp(match->pattern, path->path, pathlen) :
  			 !strncmp(match->pattern, path->path, pathlen));
  
  		if (prefixed && git_path_at_end_of_segment(&match->pattern[pathlen]))
  			return true;
  	}
  
  	return (p_fnmatch(match->pattern, filename, flags) != FNM_NOMATCH);
  }
  
  bool git_attr_rule__match(
  	git_attr_rule *rule,
  	git_attr_path *path)
  {
  	bool matched = git_attr_fnmatch__match(&rule->match, path);
  
  	if (rule->match.flags & GIT_ATTR_FNMATCH_NEGATIVE)
  		matched = !matched;
  
  	return matched;
  }
  
  git_attr_assignment *git_attr_rule__lookup_assignment(
  	git_attr_rule *rule, const char *name)
  {
  	size_t pos;
  	git_attr_name key;
  	key.name = name;
  	key.name_hash = git_attr_file__name_hash(name);
  
  	if (git_vector_bsearch(&pos, &rule->assigns, &key))
  		return NULL;
  
  	return git_vector_get(&rule->assigns, pos);
  }
  
  int git_attr_path__init(
  	git_attr_path *info, const char *path, const char *base)
  {
  	ssize_t root;
  
  	/* build full path as best we can */
  	git_buf_init(&info->full, 0);
  
  	if (git_path_join_unrooted(&info->full, path, base, &root) < 0)
  		return -1;
  
  	info->path = info->full.ptr + root;
  
  	/* remove trailing slashes */
  	while (info->full.size > 0) {
  		if (info->full.ptr[info->full.size - 1] != '/')
  			break;
  		info->full.size--;
  	}
  	info->full.ptr[info->full.size] = '\0';
  
  	/* skip leading slashes in path */
  	while (*info->path == '/')
  		info->path++;
  
  	/* find trailing basename component */
  	info->basename = strrchr(info->path, '/');
  	if (info->basename)
  		info->basename++;
  	if (!info->basename || !*info->basename)
  		info->basename = info->path;
  
  	info->is_dir = (int)git_path_isdir(info->full.ptr);
  
  	return 0;
  }
  
  void git_attr_path__free(git_attr_path *info)
  {
  	git_buf_free(&info->full);
  	info->path = NULL;
  	info->basename = NULL;
  }
  
  /*
   * From gitattributes(5):
   *
   * Patterns have the following format:
   *
   * - A blank line matches no files, so it can serve as a separator for
   *   readability.
   *
   * - A line starting with # serves as a comment.
   *
   * - An optional prefix ! which negates the pattern; any matching file
   *   excluded by a previous pattern will become included again. If a negated
   *   pattern matches, this will override lower precedence patterns sources.
   *
   * - If the pattern ends with a slash, it is removed for the purpose of the
   *   following description, but it would only find a match with a directory. In
   *   other words, foo/ will match a directory foo and paths underneath it, but
   *   will not match a regular file or a symbolic link foo (this is consistent
   *   with the way how pathspec works in general in git).
   *
   * - If the pattern does not contain a slash /, git treats it as a shell glob
   *   pattern and checks for a match against the pathname without leading
   *   directories.
   *
   * - Otherwise, git treats the pattern as a shell glob suitable for consumption
   *   by fnmatch(3) with the FNM_PATHNAME flag: wildcards in the pattern will
   *   not match a / in the pathname. For example, "Documentation/\*.html" matches
   *   "Documentation/git.html" but not "Documentation/ppc/ppc.html". A leading
   *   slash matches the beginning of the pathname; for example, "/\*.c" matches
   *   "cat-file.c" but not "mozilla-sha1/sha1.c".
   */
  
  /*
   * This will return 0 if the spec was filled out,
   * GIT_ENOTFOUND if the fnmatch does not require matching, or
   * another error code there was an actual problem.
   */
  int git_attr_fnmatch__parse(
  	git_attr_fnmatch *spec,
  	git_pool *pool,
  	const char *context,
  	const char **base)
  {
  	const char *pattern, *scan;
  	int slash_count, allow_space;
  
  	assert(spec && base && *base);
  
  	if (parse_optimized_patterns(spec, pool, *base))
  		return 0;
  
  	spec->flags = (spec->flags & GIT_ATTR_FNMATCH__INCOMING);
  	allow_space = ((spec->flags & GIT_ATTR_FNMATCH_ALLOWSPACE) != 0);
  
  	pattern = *base;
  
  	while (git__isspace(*pattern)) pattern++;
  	if (!*pattern || *pattern == '#') {
  		*base = git__next_line(pattern);
  		return GIT_ENOTFOUND;
  	}
  
  	if (*pattern == '[' && (spec->flags & GIT_ATTR_FNMATCH_ALLOWMACRO) != 0) {
  		if (strncmp(pattern, "[attr]", 6) == 0) {
  			spec->flags = spec->flags | GIT_ATTR_FNMATCH_MACRO;
  			pattern += 6;
  		}
  		/* else a character range like [a-e]* which is accepted */
  	}
  
  	if (*pattern == '!' && (spec->flags & GIT_ATTR_FNMATCH_ALLOWNEG) != 0) {
  		spec->flags = spec->flags |
  			GIT_ATTR_FNMATCH_NEGATIVE | GIT_ATTR_FNMATCH_LEADINGDIR;
  		pattern++;
  	}
  
  	slash_count = 0;
  	for (scan = pattern; *scan != '\0'; ++scan) {
  		/* scan until (non-escaped) white space */
  		if (git__isspace(*scan) && *(scan - 1) != '\\') {
  			if (!allow_space || (*scan != ' ' && *scan != '\t' && *scan != '\r'))
  				break;
  		}
  
  		if (*scan == '/') {
  			spec->flags = spec->flags | GIT_ATTR_FNMATCH_FULLPATH;
  			slash_count++;
  			if (pattern == scan)
  				pattern++;
  		}
  		/* remember if we see an unescaped wildcard in pattern */
  		else if (git__iswildcard(*scan) &&
  			(scan == pattern || (*(scan - 1) != '\\')))
  			spec->flags = spec->flags | GIT_ATTR_FNMATCH_HASWILD;
  	}
  
  	*base = scan;
  
  	if ((spec->length = scan - pattern) == 0)
  		return GIT_ENOTFOUND;
  
  	/*
  	 * Remove one trailing \r in case this is a CRLF delimited
  	 * file, in the case of Icon\r\r\n, we still leave the first
  	 * \r there to match against.
  	 */
  	if (pattern[spec->length - 1] == '\r')
  		if (--spec->length == 0)
  			return GIT_ENOTFOUND;
  
  	if (pattern[spec->length - 1] == '/') {
  		spec->length--;
  		spec->flags = spec->flags | GIT_ATTR_FNMATCH_DIRECTORY;
  		if (--slash_count <= 0)
  			spec->flags = spec->flags & ~GIT_ATTR_FNMATCH_FULLPATH;
  	}
  	if ((spec->flags & GIT_ATTR_FNMATCH_NOLEADINGDIR) == 0 &&
  		spec->length >= 2 &&
  		pattern[spec->length - 1] == '*' &&
  		pattern[spec->length - 2] == '/') {
  		spec->length -= 2;
  		spec->flags = spec->flags | GIT_ATTR_FNMATCH_LEADINGDIR;
  		/* leave FULLPATH match on, however */
  	}
  
  	if ((spec->flags & GIT_ATTR_FNMATCH_FULLPATH) != 0 &&
  		context != NULL && git_path_root(pattern) < 0)
  	{
  		/* use context path minus the trailing filename */
  		char *slash = strrchr(context, '/');
  		size_t contextlen = slash ? slash - context + 1 : 0;
  
  		/* given an unrooted fullpath match from a file inside a repo,
  		 * prefix the pattern with the relative directory of the source file
  		 */
  		spec->pattern = git_pool_malloc(
  			pool, (uint32_t)(contextlen + spec->length + 1));
  		if (spec->pattern) {
  			memcpy(spec->pattern, context, contextlen);
  			memcpy(spec->pattern + contextlen, pattern, spec->length);
  			spec->length += contextlen;
  			spec->pattern[spec->length] = '\0';
  		}
  	} else {
  		spec->pattern = git_pool_strndup(pool, pattern, spec->length);
  	}
  
  	if (!spec->pattern) {
  		*base = git__next_line(pattern);
  		return -1;
  	} else {
  		/* strip '\' that might have be used for internal whitespace */
  		spec->length = git__unescape(spec->pattern);
  		/* TODO: convert remaining '\' into '/' for POSIX ??? */
  	}
  
  	return 0;
  }
  
  static bool parse_optimized_patterns(
  	git_attr_fnmatch *spec,
  	git_pool *pool,
  	const char *pattern)
  {
  	if (!pattern[1] && (pattern[0] == '*' || pattern[0] == '.')) {
  		spec->flags = GIT_ATTR_FNMATCH_MATCH_ALL;
  		spec->pattern = git_pool_strndup(pool, pattern, 1);
  		spec->length = 1;
  
  		return true;
  	}
  
  	return false;
  }
  
  static int sort_by_hash_and_name(const void *a_raw, const void *b_raw)
  {
  	const git_attr_name *a = a_raw;
  	const git_attr_name *b = b_raw;
  
  	if (b->name_hash < a->name_hash)
  		return 1;
  	else if (b->name_hash > a->name_hash)
  		return -1;
  	else
  		return strcmp(b->name, a->name);
  }
  
  static void git_attr_assignment__free(git_attr_assignment *assign)
  {
  	/* name and value are stored in a git_pool associated with the
  	 * git_attr_file, so they do not need to be freed here
  	 */
  	assign->name = NULL;
  	assign->value = NULL;
  	git__free(assign);
  }
  
  static int merge_assignments(void **old_raw, void *new_raw)
  {
  	git_attr_assignment **old = (git_attr_assignment **)old_raw;
  	git_attr_assignment *new = (git_attr_assignment *)new_raw;
  
  	GIT_REFCOUNT_DEC(*old, git_attr_assignment__free);
  	*old = new;
  	return GIT_EEXISTS;
  }
  
  int git_attr_assignment__parse(
  	git_repository *repo,
  	git_pool *pool,
  	git_vector *assigns,
  	const char **base)
  {
  	int error;
  	const char *scan = *base;
  	git_attr_assignment *assign = NULL;
  
  	assert(assigns && !assigns->length);
  
  	git_vector_set_cmp(assigns, sort_by_hash_and_name);
  
  	while (*scan && *scan != '\n') {
  		const char *name_start, *value_start;
  
  		/* skip leading blanks */
  		while (git__isspace(*scan) && *scan != '\n') scan++;
  
  		/* allocate assign if needed */
  		if (!assign) {
  			assign = git__calloc(1, sizeof(git_attr_assignment));
  			GITERR_CHECK_ALLOC(assign);
  			GIT_REFCOUNT_INC(assign);
  		}
  
  		assign->name_hash = 5381;
  		assign->value = git_attr__true;
  
  		/* look for magic name prefixes */
  		if (*scan == '-') {
  			assign->value = git_attr__false;
  			scan++;
  		} else if (*scan == '!') {
  			assign->value = git_attr__unset; /* explicit unspecified state */
  			scan++;
  		} else if (*scan == '#') /* comment rest of line */
  			break;
  
  		/* find the name */
  		name_start = scan;
  		while (*scan && !git__isspace(*scan) && *scan != '=') {
  			assign->name_hash =
  				((assign->name_hash << 5) + assign->name_hash) + *scan;
  			scan++;
  		}
  		if (scan == name_start) {
  			/* must have found lone prefix (" - ") or leading = ("=foo")
  			 * or end of buffer -- advance until whitespace and continue
  			 */
  			while (*scan && !git__isspace(*scan)) scan++;
  			continue;
  		}
  
  		/* allocate permanent storage for name */
  		assign->name = git_pool_strndup(pool, name_start, scan - name_start);
  		GITERR_CHECK_ALLOC(assign->name);
  
  		/* if there is an equals sign, find the value */
  		if (*scan == '=') {
  			for (value_start = ++scan; *scan && !git__isspace(*scan); ++scan);
  
  			/* if we found a value, allocate permanent storage for it */
  			if (scan > value_start) {
  				assign->value = git_pool_strndup(pool, value_start, scan - value_start);
  				GITERR_CHECK_ALLOC(assign->value);
  			}
  		}
  
  		/* expand macros (if given a repo with a macro cache) */
  		if (repo != NULL && assign->value == git_attr__true) {
  			git_attr_rule *macro =
  				git_attr_cache__lookup_macro(repo, assign->name);
  
  			if (macro != NULL) {
  				unsigned int i;
  				git_attr_assignment *massign;
  
  				git_vector_foreach(&macro->assigns, i, massign) {
  					GIT_REFCOUNT_INC(massign);
  
  					error = git_vector_insert_sorted(
  						assigns, massign, &merge_assignments);
  					if (error < 0 && error != GIT_EEXISTS)
  						return error;
  				}
  			}
  		}
  
  		/* insert allocated assign into vector */
  		error = git_vector_insert_sorted(assigns, assign, &merge_assignments);
  		if (error < 0 && error != GIT_EEXISTS)
  			return error;
  
  		/* clear assign since it is now "owned" by the vector */
  		assign = NULL;
  	}
  
  	if (assign != NULL)
  		git_attr_assignment__free(assign);
  
  	*base = git__next_line(scan);
  
  	return (assigns->length == 0) ? GIT_ENOTFOUND : 0;
  }
  
  static void git_attr_rule__clear(git_attr_rule *rule)
  {
  	unsigned int i;
  	git_attr_assignment *assign;
  
  	if (!rule)
  		return;
  
  	if (!(rule->match.flags & GIT_ATTR_FNMATCH_IGNORE)) {
  		git_vector_foreach(&rule->assigns, i, assign)
  			GIT_REFCOUNT_DEC(assign, git_attr_assignment__free);
  		git_vector_free(&rule->assigns);
  	}
  
  	/* match.pattern is stored in a git_pool, so no need to free */
  	rule->match.pattern = NULL;
  	rule->match.length = 0;
  }
  
  void git_attr_rule__free(git_attr_rule *rule)
  {
  	git_attr_rule__clear(rule);
  	git__free(rule);
  }
  
  

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