thodg/libgit2/src/ignore.c

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• Hash : b709e951
  Author :
  Date : 2012-05-04T11:06:12
  

  Fix memory leaks and use after free

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• src/ignore.c

• #include "ignore.h"
  #include "path.h"
  
  #define GIT_IGNORE_INTERNAL		"[internal]exclude"
  #define GIT_IGNORE_FILE_INREPO	"info/exclude"
  #define GIT_IGNORE_FILE			".gitignore"
  
  static int parse_ignore_file(
  	git_repository *repo, const char *buffer, git_attr_file *ignores)
  {
  	int error = 0;
  	git_attr_fnmatch *match = NULL;
  	const char *scan = NULL;
  	char *context = NULL;
  
  	GIT_UNUSED(repo);
  
  	if (ignores->key && git__suffixcmp(ignores->key, "/" GIT_IGNORE_FILE) == 0) {
  		context = ignores->key + 2;
  		context[strlen(context) - strlen(GIT_IGNORE_FILE)] = '\0';
  	}
  
  	scan = buffer;
  
  	while (!error && *scan) {
  		if (!match) {
  			match = git__calloc(1, sizeof(*match));
  			GITERR_CHECK_ALLOC(match);
  		}
  
  		if (!(error = git_attr_fnmatch__parse(
  			match, ignores->pool, context, &scan)))
  		{
  			match->flags = match->flags | GIT_ATTR_FNMATCH_IGNORE;
  			scan = git__next_line(scan);
  			error = git_vector_insert(&ignores->rules, match);
  		}
  
  		if (error != 0) {
  			git__free(match->pattern);
  			match->pattern = NULL;
  
  			if (error == GIT_ENOTFOUND)
  				error = 0;
  		} else {
  			match = NULL; /* vector now "owns" the match */
  		}
  	}
  
  	git__free(match);
  	/* restore file path used for context */
  	if (context)
  		context[strlen(context)] = '.'; /* first char of GIT_IGNORE_FILE */
  
  	return error;
  }
  
  #define push_ignore_file(R,S,B,F) \
  	git_attr_cache__push_file((R),(B),(F),GIT_ATTR_FILE_FROM_FILE,parse_ignore_file,(S))
  
  static int push_one_ignore(void *ref, git_buf *path)
  {
  	git_ignores *ign = (git_ignores *)ref;
  	return push_ignore_file(ign->repo, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
  }
  
  int git_ignore__for_path(
  	git_repository *repo,
  	const char *path,
  	git_ignores *ignores)
  {
  	int error = 0;
  	const char *workdir = git_repository_workdir(repo);
  
  	assert(ignores);
  
  	ignores->repo = repo;
  	git_buf_init(&ignores->dir, 0);
  	ignores->ign_internal = NULL;
  
  	if ((error = git_vector_init(&ignores->ign_path, 8, NULL)) < 0 ||
  		(error = git_vector_init(&ignores->ign_global, 2, NULL)) < 0 ||
  		(error = git_attr_cache__init(repo)) < 0)
  		goto cleanup;
  
  	/* given a unrooted path in a non-bare repo, resolve it */
  	if (workdir && git_path_root(path) < 0)
  		error = git_path_find_dir(&ignores->dir, path, workdir);
  	else
  		error = git_buf_sets(&ignores->dir, path);
  	if (error < 0)
  		goto cleanup;
  
  	/* set up internals */
  	error = git_attr_cache__internal_file(
  		repo, GIT_IGNORE_INTERNAL, &ignores->ign_internal);
  	if (error < 0)
  		goto cleanup;
  
  	/* load .gitignore up the path */
  	if (workdir != NULL) {
  		error = git_path_walk_up(
  			&ignores->dir, workdir, push_one_ignore, ignores);
  		if (error < 0)
  			goto cleanup;
  	}
  
  	/* load .git/info/exclude */
  	error = push_ignore_file(repo, &ignores->ign_global,
  		git_repository_path(repo), GIT_IGNORE_FILE_INREPO);
  	if (error < 0)
  		goto cleanup;
  
  	/* load core.excludesfile */
  	if (git_repository_attr_cache(repo)->cfg_excl_file != NULL)
  		error = push_ignore_file(repo, &ignores->ign_global, NULL,
  			git_repository_attr_cache(repo)->cfg_excl_file);
  
  cleanup:
  	if (error < 0)
  		git_ignore__free(ignores);
  
  	return error;
  }
  
  int git_ignore__push_dir(git_ignores *ign, const char *dir)
  {
  	if (git_buf_joinpath(&ign->dir, ign->dir.ptr, dir) < 0)
  		return -1;
  	else
  		return push_ignore_file(
  			ign->repo, &ign->ign_path, ign->dir.ptr, GIT_IGNORE_FILE);
  }
  
  int git_ignore__pop_dir(git_ignores *ign)
  {
  	if (ign->ign_path.length > 0) {
  		git_attr_file *file = git_vector_last(&ign->ign_path);
  		if (git__suffixcmp(ign->dir.ptr, file->key + 2) == 0)
  			git_vector_pop(&ign->ign_path);
  		git_buf_rtruncate_at_char(&ign->dir, '/');
  	}
  	return 0;
  }
  
  void git_ignore__free(git_ignores *ignores)
  {
  	/* don't need to free ignores->ign_internal since it is in cache */
  	git_vector_free(&ignores->ign_path);
  	git_vector_free(&ignores->ign_global);
  	git_buf_free(&ignores->dir);
  }
  
  static bool ignore_lookup_in_rules(
  	git_vector *rules, git_attr_path *path, int *ignored)
  {
  	unsigned int j;
  	git_attr_fnmatch *match;
  
  	git_vector_rforeach(rules, j, match) {
  		if (git_attr_fnmatch__match(match, path)) {
  			*ignored = ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) == 0);
  			return true;
  		}
  	}
  
  	return false;
  }
  
  int git_ignore__lookup(
  	git_ignores *ignores, const char *pathname, int *ignored)
  {
  	unsigned int i;
  	git_attr_file *file;
  	git_attr_path path;
  
  	if (git_attr_path__init(
  		&path, pathname, git_repository_workdir(ignores->repo)) < 0)
  		return -1;
  
  	/* first process builtins - success means path was found */
  	if (ignore_lookup_in_rules(
  			&ignores->ign_internal->rules, &path, ignored))
  		goto cleanup;
  
  	/* next process files in the path */
  	git_vector_foreach(&ignores->ign_path, i, file) {
  		if (ignore_lookup_in_rules(&file->rules, &path, ignored))
  			goto cleanup;
  	}
  
  	/* last process global ignores */
  	git_vector_foreach(&ignores->ign_global, i, file) {
  		if (ignore_lookup_in_rules(&file->rules, &path, ignored))
  			goto cleanup;
  	}
  
  	*ignored = 0;
  
  cleanup:
  	git_attr_path__free(&path);
  	return 0;
  }
  

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