/*

 * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

 * Copyright (C) 2008  Red Hat, Inc

 * Copyright (C) 2009, 2011, 2012, 2014, 2016  J. Ali Harlow <ali@juiblex.co.uk>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include "config.h"

#include <stdlib.h>

#include <stdint.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <dirent.h>

#include <unistd.h>

#include <fcntl.h>

#include <limits.h>

#include <assert.h>

#ifdef MSWIN_API

#include <shlobj.h>

#endif

#include "razor.h"

#include "razor-internal.h"

#ifndef O_BINARY

#define O_BINARY	0

#endif

#ifndef FALSE

#define FALSE 0

#endif

#ifndef TRUE

#define TRUE (!FALSE)

#endif

static const char system_repo_filename[] = "system.rzdb";

/*

 * system_lock_filename is chosen to be the same as the pre v0.3

 * next_repo_filename. This means that once a system has been

 * updated by a v0.3+ copy of razor all pre v0.3 versions of razor

 * will see the system as permenantly locked.

 */

static const char system_lock_filename[] = "system-next.rzdb";

#ifdef MSWIN_API

#define RAZOR_DATABASE_URI	NULL

#else

/*

 * The non-MSWIN default is a relative-ref and thus affected by the root

 */

#define RAZOR_DATABASE_URI	"var/lib/razor"

#endif

static char *razor_database_uri = RAZOR_DATABASE_URI;

static int razor_database_uri_alloced = FALSE;

struct razor_root {

	struct razor_set *system;

	char *uri;

};

static void

razor_root_init(void)

{

#ifdef MSWIN_API

	/*

	 * The MSWIN default is an absolute-URI and thus unaffected by the root

	 */

	char database_path[MAX_PATH];

	if (!razor_database_uri) {

		SHGetFolderPath(NULL,

			CSIDL_COMMON_APPDATA | CSIDL_FLAG_DONT_VERIFY, NULL, 0,

			database_path);

		strcat(database_path, "\\Razor");

		razor_database_uri = razor_path_to_uri(database_path);

		razor_database_uri_alloced = TRUE;

	}

#endif

}

RAZOR_EXPORT const char *razor_get_database_uri(void)

{

	razor_root_init();

	return razor_database_uri;

}

RAZOR_EXPORT void

razor_set_database_uri(const char *database_uri)

{

	if (razor_database_uri_alloced)

		free(razor_database_uri);

	if (database_uri) {

		razor_database_uri = strdup(database_uri);

		razor_database_uri_alloced = TRUE;

	} else {

		razor_database_uri = RAZOR_DATABASE_URI;

		razor_database_uri_alloced = FALSE;

	}

}

char *razor_resolve_database_file(const char *root_uri, const char *filename,

				  struct razor_error **error)

{

	char *s, *uri;

	razor_root_init();

	s = razor_concat(razor_database_uri, "/", filename, NULL);

	uri = razor_resolve_uri_root(root_uri, s, -1, error);

	free(s);

	return uri;

}

RAZOR_EXPORT int

razor_root_create(const char *root_uri, struct razor_error **error)

{

	int retval, is_within_root, is_directory;

	struct razor_set *set;

	struct razor_atomic *atomic;

	struct razor_error *tmp_err = NULL;

	char *uri;

	uri = razor_resolve_database_file(root_uri, system_repo_filename,

					  error);

	if (!uri)

		return -1;

	if (razor_uri_is_directory(uri, NULL) >= 0) {

		razor_set_error(error, RAZOR_GENERAL_ERROR,

				RAZOR_GENERAL_ERROR_DATABASE_EXISTS, NULL,

				"A razor install root is already initialized");

		free(uri);

		return -1;

	}

	is_within_root = root_uri && strchr(root_uri, '/') &&

			 str_has_prefix(uri, root_uri);

	atomic = razor_atomic_open("Create initial package set");

	if (is_within_root) {

		is_directory = razor_uri_is_directory(root_uri, NULL);

		if (!is_directory) {

			razor_set_error(error, RAZOR_POSIX_ERROR, ENOTDIR,

					root_uri, "Not a directory");

			return -1;

		} else if (is_directory < 0 &&

			   razor_uri_mkdir(root_uri, 0777, &tmp_err) < 0) {

			razor_set_error(error,

					razor_error_get_domain(tmp_err),

					razor_error_get_code(tmp_err),

					root_uri,

					"Could not create install root");

			return -1;

		}

		razor_atomic_make_dirs(atomic, root_uri,

				       uri + strlen(root_uri));

	} else

		razor_atomic_make_dirs(atomic, "", uri);

	set = razor_set_create();

	razor_set_write(set, atomic, uri, RAZOR_SECTION_ALL);

	free(uri);

	retval = razor_atomic_commit(atomic);

	if (retval)

		razor_propagate_error(error,

				      razor_atomic_get_error(atomic),

				      "Could not write initial package set");

	razor_set_unref(set);

	razor_atomic_destroy(atomic);

	return retval;

}

RAZOR_EXPORT struct razor_root *

razor_root_open(const char *root_uri, struct razor_error **error)

{

	struct razor_root *image;

	char *lock_uri;

	int r;

	lock_uri = razor_resolve_database_file(root_uri, system_lock_filename,

					       error);

	if (!lock_uri)

		return NULL;

	image = malloc(sizeof *image);

	if (image == NULL) {

		free(lock_uri);

		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

				"Not enough memory");

		return NULL;

	}

	image->system = razor_set_create_without_root();

	if (image->system == NULL) {

		free(image);

		free(lock_uri);

		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

				"Not enough memory");

		return NULL;

	}

	r = razor_set_acquire_lock(image->system, lock_uri, 1);

	free(lock_uri);

	if (r < 0) {

		razor_set_error(error, RAZOR_GENERAL_ERROR,

				RAZOR_GENERAL_ERROR_DATABASE_LOCKED, NULL,

				"Failed to acquire exclusive system lock");

		razor_set_unref(image->system);

		free(image);

		return NULL;

	}

	image->uri = razor_resolve_database_file(root_uri, system_repo_filename,

						 error);

	if (!image->uri) {

		razor_set_unref(image->system);

		free(image);

		return NULL;

	}

	if (razor_set_bind_sections(image->system, image->uri,

				    RAZOR_SET_PRIVATE, error)) {

		free(image->uri);

		razor_set_unref(image->system);

		free(image);

		return NULL;

	}

	return image;

}

RAZOR_EXPORT struct razor_set *

razor_root_open_read_only(const char *root_uri, struct razor_error **error)

{

	int r;

	char *uri;

	struct razor_set *set;

	uri = razor_resolve_database_file(root_uri, system_lock_filename,

					  error);

	if (!uri)

		return NULL;

	set = razor_set_create_without_root();

	if (set == NULL) {

		free(uri);

		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

				"Not enough memory");

		return NULL;

	}

	r = razor_set_acquire_lock(set, uri, 0);

	free(uri);

	if (r < 0) {

		razor_set_error(error, RAZOR_GENERAL_ERROR,

				RAZOR_GENERAL_ERROR_DATABASE_LOCKED, NULL,

				"Failed to acquire non-exclusive system lock");

		razor_set_unref(set);

		return NULL;

	}

	uri = razor_resolve_database_file(root_uri, system_repo_filename,

					  error);

	if (!uri || razor_set_bind_sections(set, uri, 0, error)) {

		razor_set_unref(set);

		set = NULL;

	}

	free(uri);

	return set;

}

RAZOR_EXPORT struct razor_set *

razor_root_get_system_set(struct razor_root *root)

{

	assert (root != NULL);

	return root->system;

}

RAZOR_EXPORT int

razor_root_close(struct razor_root *root)

{

	assert (root != NULL);

	razor_set_unref(root->system);

	free(root->uri);

	free(root);

	return 0;

}

RAZOR_EXPORT int

razor_root_update(struct razor_root *root, struct razor_set *next,

		  struct razor_atomic *atomic)

{

	int handle, retval;

	assert (root != NULL);

	assert (next != NULL);

	handle = razor_atomic_create_file(atomic, root->uri,

					  S_IRWXU | S_IRWXG | S_IRWXO);

	if (handle < 0)

		return handle;

	razor_set_write_to_handle(next, atomic, handle, RAZOR_SECTION_ALL);

	retval = razor_atomic_close(atomic, handle);

	if (!retval) {

		razor_set_unref(root->system);

		root->system = razor_set_ref(next);

	}

	return retval;

}