thodg/libgit2/src/repository.c

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• Hash : 50b7334e
  Author :
  Date : 2011-06-01T09:58:21
  

  Merge pull request #206 from nulltoken/topic/is-bare Add git_repository_is_bare() accessor

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• src/repository.c

• /*
   * This file is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License, version 2,
   * as published by the Free Software Foundation.
   *
   * In addition to the permissions in the GNU General Public License,
   * the authors give you unlimited permission to link the compiled
   * version of this file into combinations with other programs,
   * and to distribute those combinations without any restriction
   * coming from the use of this file.  (The General Public License
   * restrictions do apply in other respects; for example, they cover
   * modification of the file, and distribution when not linked into
   * a combined executable.)
   *
   * This file is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; see the file COPYING.  If not, write to
   * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  #include <stdarg.h>
  
  #include "git2/object.h"
  
  #include "common.h"
  #include "repository.h"
  #include "commit.h"
  #include "tag.h"
  #include "blob.h"
  #include "fileops.h"
  
  #include "refs.h"
  
  #define GIT_OBJECTS_INFO_DIR GIT_OBJECTS_DIR "info/"
  #define GIT_OBJECTS_PACK_DIR GIT_OBJECTS_DIR "pack/"
  
  #define GIT_BRANCH_MASTER "master"
  
  typedef struct {
  	char *path_repository;
  	unsigned is_bare:1, has_been_reinit:1;
  } repo_init;
  
  /*
   * Git repository open methods
   *
   * Open a repository object from its path
   */
  static int assign_repository_dirs(
  		git_repository *repo,
  		const char *git_dir,
  		const char *git_object_directory,
  		const char *git_index_file,
  		const char *git_work_tree)
  {
  	char path_aux[GIT_PATH_MAX];
  	int error = GIT_SUCCESS;
  
  	assert(repo);
  
  	if (git_dir == NULL)
  		return git__throw(GIT_ENOTFOUND, "Failed to open repository. Git dir not found");
  
  	error = gitfo_prettify_dir_path(path_aux, sizeof(path_aux), git_dir);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to open repository");
  
  	/* store GIT_DIR */
  	repo->path_repository = git__strdup(path_aux);
  	if (repo->path_repository == NULL)
  		return GIT_ENOMEM;
  
  	/* path to GIT_OBJECT_DIRECTORY */
  	if (git_object_directory == NULL)
  		git__joinpath(path_aux, repo->path_repository, GIT_OBJECTS_DIR);
  	else {
  		error = gitfo_prettify_dir_path(path_aux, sizeof(path_aux), git_object_directory);
  		if (error < GIT_SUCCESS)
  			return git__rethrow(error, "Failed to open repository");
  	}
  
  	/* Store GIT_OBJECT_DIRECTORY */
  	repo->path_odb = git__strdup(path_aux);
  	if (repo->path_odb == NULL)
  		return GIT_ENOMEM;
  
  	/* path to GIT_WORK_TREE */
  	if (git_work_tree == NULL)
  		repo->is_bare = 1;
  	else {
  		error = gitfo_prettify_dir_path(path_aux, sizeof(path_aux), git_work_tree);
  		if (error < GIT_SUCCESS)
  			return git__rethrow(error, "Failed to open repository");
  
  		/* Store GIT_WORK_TREE */
  		repo->path_workdir = git__strdup(path_aux);
  		if (repo->path_workdir == NULL)
  			return GIT_ENOMEM;
  
  		/* Path to GIT_INDEX_FILE */
  		if (git_index_file == NULL)
  			git__joinpath(path_aux, repo->path_repository, GIT_INDEX_FILE);
  		else {
  			error = gitfo_prettify_file_path(path_aux, sizeof(path_aux), git_index_file);
  			if (error < GIT_SUCCESS)
  				return git__rethrow(error, "Failed to open repository");
  		}
  
  		/* store GIT_INDEX_FILE */
  		repo->path_index = git__strdup(path_aux);
  		if (repo->path_index == NULL)
  			return GIT_ENOMEM;
  	}
  	
  	return GIT_SUCCESS;
  }
  
  static int check_repository_dirs(git_repository *repo)
  {
  	char path_aux[GIT_PATH_MAX];
  
  	if (gitfo_isdir(repo->path_repository) < GIT_SUCCESS)
  		return git__throw(GIT_ENOTAREPO, "`%s` is not a folder", repo->path_repository);
  
  	/* Ensure GIT_OBJECT_DIRECTORY exists */
  	if (gitfo_isdir(repo->path_odb) < GIT_SUCCESS)
  		return git__throw(GIT_ENOTAREPO, "`%s` does not exist", repo->path_odb);
  
  	/* Ensure HEAD file exists */
  	git__joinpath(path_aux, repo->path_repository, GIT_HEAD_FILE);
  	if (gitfo_exists(path_aux) < 0)
  		return git__throw(GIT_ENOTAREPO, "HEAD file is missing");
  
  	return GIT_SUCCESS;
  }
  
  static int guess_repository_dirs(git_repository *repo, const char *repository_path)
  {
  	char buffer[GIT_PATH_MAX];
  	const char *path_work_tree = NULL;
  
  	/* Git directory name */
  	if (git__basename_r(buffer, sizeof(buffer), repository_path) < 0)
  		return git__throw(GIT_EINVALIDPATH, "Unable to parse folder name from `%s`", repository_path);
  
  	if (strcmp(buffer, DOT_GIT) == 0) {
  		/* Path to working dir */
  		if (git__dirname_r(buffer, sizeof(buffer), repository_path) < 0)
  			return git__throw(GIT_EINVALIDPATH, "Unable to parse parent folder name from `%s`", repository_path);
  		path_work_tree = buffer;
  	}
  
  	return assign_repository_dirs(repo, repository_path, NULL, NULL, path_work_tree);
  }
  
  static git_repository *repository_alloc()
  {
  	int error;
  
  	git_repository *repo = git__malloc(sizeof(git_repository));
  	if (!repo)
  		return NULL;
  
  	memset(repo, 0x0, sizeof(git_repository));
  
  	error = git_cache_init(&repo->objects, GIT_DEFAULT_CACHE_SIZE, &git_object__free);
  	if (error < GIT_SUCCESS) {
  		free(repo);
  		return NULL;
  	}
  
  	if (git_repository__refcache_init(&repo->references) < GIT_SUCCESS) {
  		free(repo);
  		return NULL;
  	}
  
  	return repo;
  }
  
  static int init_odb(git_repository *repo)
  {
  	return git_odb_open(&repo->db, repo->path_odb);	/* TODO: Move odb.c to new error handling */
  }
  
  int git_repository_open3(git_repository **repo_out,
  		const char *git_dir,
  		git_odb *object_database,
  		const char *git_index_file,
  		const char *git_work_tree)
  {
  	git_repository *repo;
  	int error = GIT_SUCCESS;
  
  	assert(repo_out);
  
  	if (object_database == NULL)
  		return git__throw(GIT_EINVALIDARGS, "Failed to open repository. `object_database` can't be null");
  
  	repo = repository_alloc();
  	if (repo == NULL)
  		return GIT_ENOMEM;
  
  	error = assign_repository_dirs(repo, 
  			git_dir, 
  			NULL,
  			git_index_file,
  			git_work_tree);
  
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = check_repository_dirs(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	repo->db = object_database;
  
  	*repo_out = repo;
  	return GIT_SUCCESS;
  
  cleanup:
  	git_repository_free(repo);
  	return git__rethrow(error, "Failed to open repository");
  }
  
  
  int git_repository_open2(git_repository **repo_out,
  		const char *git_dir,
  		const char *git_object_directory,
  		const char *git_index_file,
  		const char *git_work_tree)
  {
  	git_repository *repo;
  	int error = GIT_SUCCESS;
  
  	assert(repo_out);
  
  	repo = repository_alloc();
  	if (repo == NULL)
  		return GIT_ENOMEM;
  
  	error = assign_repository_dirs(repo,
  			git_dir, 
  			git_object_directory,
  			git_index_file,
  			git_work_tree);
  
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = check_repository_dirs(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = init_odb(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	*repo_out = repo;
  	return GIT_SUCCESS;
  
  cleanup:
  	git_repository_free(repo);
  	return git__rethrow(error, "Failed to open repository");
  }
  
  int git_repository_open(git_repository **repo_out, const char *path)
  {
  	git_repository *repo;
  	int error = GIT_SUCCESS;
  
  	assert(repo_out && path);
  
  	repo = repository_alloc();
  	if (repo == NULL)
  		return GIT_ENOMEM;
  
  	error = guess_repository_dirs(repo, path);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = check_repository_dirs(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = init_odb(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	*repo_out = repo;
  	return GIT_SUCCESS;
  
  cleanup:
  	git_repository_free(repo);
  	return git__rethrow(error, "Failed to open repository");
  }
  
  void git_repository_free(git_repository *repo)
  {
  	if (repo == NULL)
  		return;
  
  	git_cache_free(&repo->objects);
  	git_repository__refcache_free(&repo->references);
  
  	free(repo->path_workdir);
  	free(repo->path_index);
  	free(repo->path_repository);
  	free(repo->path_odb);
  
  	if (repo->db != NULL)
  		git_odb_close(repo->db);
  
  	free(repo);
  }
  
  git_odb *git_repository_database(git_repository *repo)
  {
  	assert(repo);
  	return repo->db;
  }
  
  static int repo_init_reinit(repo_init *results)
  {
  	/* TODO: reinit the repository */
  	results->has_been_reinit = 1;
  	return git__throw(GIT_ENOTIMPLEMENTED, "Failed to reinitialize the repository. This feature is not yet implemented");
  }
  
  static int repo_init_createhead(git_repository *repo)
  {
  	git_reference *head_reference;
  	return git_reference_create_symbolic(&head_reference, repo, GIT_HEAD_FILE, GIT_REFS_HEADS_MASTER_FILE);	/* TODO: finalize moving refs.c to new error handling */
  }
  
  static int repo_init_check_head_existence(char * repository_path)
  {
  	char temp_path[GIT_PATH_MAX];
  
  	git__joinpath(temp_path, repository_path, GIT_HEAD_FILE);
  	return gitfo_exists(temp_path);
  }
  
  static int repo_init_structure(repo_init *results)
  {
  	const int mode = 0755; /* or 0777 ? */
  	int error;
  
  	char temp_path[GIT_PATH_MAX];
  	char *git_dir = results->path_repository;
  
  	if (gitfo_mkdir_recurs(git_dir, mode))
  		return git__throw(GIT_ERROR, "Failed to initialize repository structure. Could not mkdir");
  
  	/* Creates the '/objects/info/' directory */
  	git__joinpath(temp_path, git_dir, GIT_OBJECTS_INFO_DIR);
  	error = gitfo_mkdir_recurs(temp_path, mode);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to initialize repository structure");
  
  	/* Creates the '/objects/pack/' directory */
  	git__joinpath(temp_path, git_dir, GIT_OBJECTS_PACK_DIR);
  	error = gitfo_mkdir(temp_path, mode);
  	if (error < GIT_SUCCESS)
  		return git__throw(error, "Unable to create `%s` folder", temp_path);
  
  	/* Creates the '/refs/heads/' directory */
  	git__joinpath(temp_path, git_dir, GIT_REFS_HEADS_DIR);
  	error = gitfo_mkdir_recurs(temp_path, mode);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to initialize repository structure");
  
  	/* Creates the '/refs/tags/' directory */
  	git__joinpath(temp_path, git_dir, GIT_REFS_TAGS_DIR);
  	error = gitfo_mkdir(temp_path, mode);
  	if (error < GIT_SUCCESS)
  		return git__throw(error, "Unable to create `%s` folder", temp_path);
  
  	/* TODO: what's left? templates? */
  
  	return GIT_SUCCESS;
  }
  
  static int repo_init_find_dir(repo_init *results, const char* path)
  {
  	char temp_path[GIT_PATH_MAX];
  	int error = GIT_SUCCESS;
  
  	error = gitfo_prettify_dir_path(temp_path, sizeof(temp_path), path);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to find directory to initialize repository");
  
  	if (!results->is_bare) {
  		git__joinpath(temp_path, temp_path, GIT_DIR);
  	}
  
  	results->path_repository = git__strdup(temp_path);
  	if (results->path_repository == NULL)
  		return GIT_ENOMEM;
  
  	return GIT_SUCCESS;
  }
  
  int git_repository_init(git_repository **repo_out, const char *path, unsigned is_bare)
  {
  	int error = GIT_SUCCESS;
  	git_repository *repo = NULL;
  	repo_init results;
  	
  	assert(repo_out && path);
  
  	results.path_repository = NULL;
  	results.is_bare = is_bare;
  
  	error = repo_init_find_dir(&results, path);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if (!repo_init_check_head_existence(results.path_repository))
  		return repo_init_reinit(&results);
  
  	error = repo_init_structure(&results);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	repo = repository_alloc();
  	if (repo == NULL) {
  		error = GIT_ENOMEM;
  		goto cleanup;
  	}
  
  	error = guess_repository_dirs(repo, results.path_repository);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	assert(repo->is_bare == is_bare);
  
  	error = init_odb(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	error = repo_init_createhead(repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	/* should never fail */
  	assert(check_repository_dirs(repo) == GIT_SUCCESS);
  
  	free(results.path_repository);
  	*repo_out = repo;
  	return GIT_SUCCESS;
  
  cleanup:
  	free(results.path_repository);
  	git_repository_free(repo);
  	return git__rethrow(error, "Failed to (re)init the repository `%s`", path);
  }
  
  int git_repository_is_empty(git_repository *repo)
  {
  	git_reference *head, *branch;
  	int error;
  
  	error = git_reference_lookup(&head, repo, "HEAD");
  	if (error < GIT_SUCCESS)
  		return git__throw(error, "Failed to determine the emptiness of the repository. An error occured while retrieving the HEAD reference");
  
  	if (git_reference_type(head) != GIT_REF_SYMBOLIC)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to determine the emptiness of the repository. HEAD is probably in detached state");
  
  	return git_reference_resolve(&branch, head) == GIT_SUCCESS ? 0 : 1;
  }
  
  const char *git_repository_path(git_repository *repo)
  {
  	assert(repo);
  	return repo->path_repository;
  }
  
  const char *git_repository_workdir(git_repository *repo)
  {
  	assert(repo);
  	return repo->path_workdir;
  }
  
  int git_repository_is_bare(git_repository *repo)
  {
  	assert(repo);
  	return repo->is_bare;
  }
  

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