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librazor/root.c
author J. Ali Harlow <ali@juiblex.co.uk>
Tue Apr 24 19:27:29 2018 +0100 (2018-04-24)
changeset 496 203fa998c6df
parent 447 0a5e583393e1
child 499 c89e5edb8eae
permissions -rw-r--r--
Support expat v2.2 
     1 /*

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

     3  * Copyright (C) 2008  Red Hat, Inc

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

     5  *

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

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

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

     9  * (at your option) any later version.

    10  *

    11  * This program is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    14  * GNU General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU General Public License along

    17  * with this program; if not, write to the Free Software Foundation, Inc.,

    18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    19  */

    20 

    21 #include "config.h"

    22 

    23 #include <stdlib.h>

    24 #include <stdint.h>

    25 #include <stdio.h>

    26 #include <string.h>

    27 #include <errno.h>

    28 #include <dirent.h>

    29 #include <unistd.h>

    30 #include <fcntl.h>

    31 #include <limits.h>

    32 #include <assert.h>

    33 #ifdef MSWIN_API

    34 #include <shlobj.h>

    35 #endif

    36 

    37 #include "razor.h"

    38 #include "razor-internal.h"

    39 

    40 #ifndef O_BINARY

    41 #define O_BINARY	0

    42 #endif

    43 

    44 #ifndef FALSE

    45 #define FALSE 0

    46 #endif

    47 

    48 #ifndef TRUE

    49 #define TRUE (!FALSE)

    50 #endif

    51 

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

    53 /*

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

    55  * next_repo_filename. This means that once a system has been

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

    57  * will see the system as permenantly locked.

    58  */

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

    60 #ifdef MSWIN_API

    61 #define RAZOR_DATABASE_URI	NULL

    62 #else

    63 /*

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

    65  */

    66 #define RAZOR_DATABASE_URI	"var/lib/razor"

    67 #endif

    68 static char *razor_database_uri = RAZOR_DATABASE_URI;

    69 static int razor_database_uri_alloced = FALSE;

    70 

    71 struct razor_root {

    72 	struct razor_set *system;

    73 	char *uri;

    74 };

    75 

    76 static void

    77 razor_root_init(void)

    78 {

    79 #ifdef MSWIN_API

    80 	/*

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

    82 	 */

    83 	char database_path[MAX_PATH];

    84 	if (!razor_database_uri) {

    85 		SHGetFolderPath(NULL,

    86 			CSIDL_COMMON_APPDATA | CSIDL_FLAG_DONT_VERIFY, NULL, 0,

    87 			database_path);

    88 		strcat(database_path, "\\Razor");

    89 		razor_database_uri = razor_path_to_uri(database_path);

    90 		razor_database_uri_alloced = TRUE;

    91 	}

    92 #endif

    93 }

    94 

    95 RAZOR_EXPORT const char *razor_get_database_uri(void)

    96 {

    97 	razor_root_init();

    98 	return razor_database_uri;

    99 }

   100 

   101 RAZOR_EXPORT void

   102 razor_set_database_uri(const char *database_uri)

   103 {

   104 	if (razor_database_uri_alloced)

   105 		free(razor_database_uri);

   106 

   107 	if (database_uri) {

   108 		razor_database_uri = strdup(database_uri);

   109 		razor_database_uri_alloced = TRUE;

   110 	} else {

   111 		razor_database_uri = RAZOR_DATABASE_URI;

   112 		razor_database_uri_alloced = FALSE;

   113 	}

   114 }

   115 

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

   117 				  struct razor_error **error)

   118 {

   119 	char *s, *uri;

   120 

   121 	razor_root_init();

   122 

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

   124 

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

   126 

   127 	free(s);

   128 

   129 	return uri;

   130 }

   131 

   132 RAZOR_EXPORT int

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

   134 {

   135 	int retval, is_within_root, is_directory;

   136 	struct razor_set *set;

   137 	struct razor_atomic *atomic;

   138 	struct razor_error *tmp_err = NULL;

   139 	char *uri;

   140 

   141 	uri = razor_resolve_database_file(root_uri, system_repo_filename,

   142 					  error);

   143 

   144 	if (!uri)

   145 		return -1;

   146 

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

   148 		razor_set_error(error, RAZOR_GENERAL_ERROR,

   149 				RAZOR_GENERAL_ERROR_DATABASE_EXISTS, NULL,

   150 				"A razor install root is already initialized");

   151 		free(uri);

   152 		return -1;

   153 	}

   154 

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

   156 			 str_has_prefix(uri, root_uri);

   157 

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

   159 

   160 	if (is_within_root) {

   161 		is_directory = razor_uri_is_directory(root_uri, NULL);

   162 

   163 		if (!is_directory) {

   164 			razor_set_error(error, RAZOR_POSIX_ERROR, ENOTDIR,

   165 					root_uri, "Not a directory");

   166 			return -1;

   167 		} else if (is_directory < 0 &&

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

   169 			razor_set_error(error,

   170 					razor_error_get_domain(tmp_err),

   171 					razor_error_get_code(tmp_err),

   172 					root_uri,

   173 					"Could not create install root");

   174 			return -1;

   175 		}

   176 

   177 		razor_atomic_make_dirs(atomic, root_uri,

   178 				       uri + strlen(root_uri));

   179 	} else

   180 		razor_atomic_make_dirs(atomic, "", uri);

   181 

   182 	set = razor_set_create();

   183 	razor_set_write(set, atomic, uri, RAZOR_SECTION_ALL);

   184 	free(uri);

   185 	retval = razor_atomic_commit(atomic);

   186 	if (retval)

   187 		razor_propagate_error(error,

   188 				      razor_atomic_get_error(atomic),

   189 				      "Could not write initial package set");

   190 	razor_set_unref(set);

   191 	razor_atomic_destroy(atomic);

   192 

   193 	return retval;

   194 }

   195 

   196 RAZOR_EXPORT struct razor_root *

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

   198 {

   199 	struct razor_root *image;

   200 	char *lock_uri;

   201 	int r;

   202 

   203 	lock_uri = razor_resolve_database_file(root_uri, system_lock_filename,

   204 					       error);

   205 

   206 	if (!lock_uri)

   207 		return NULL;

   208 

   209 	image = malloc(sizeof *image);

   210 	if (image == NULL) {

   211 		free(lock_uri);

   212 		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

   213 				"Not enough memory");

   214 		return NULL;

   215 	}

   216 

   217 	image->system = razor_set_create_without_root();

   218 	if (image->system == NULL) {

   219 		free(image);

   220 		free(lock_uri);

   221 		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

   222 				"Not enough memory");

   223 		return NULL;

   224 	}

   225 

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

   227 

   228 	free(lock_uri);

   229 

   230 	if (r < 0) {

   231 		razor_set_error(error, RAZOR_GENERAL_ERROR,

   232 				RAZOR_GENERAL_ERROR_DATABASE_LOCKED, NULL,

   233 				"Failed to acquire exclusive system lock");

   234 		razor_set_unref(image->system);

   235 		free(image);

   236 		return NULL;

   237 	}

   238 

   239 	image->uri = razor_resolve_database_file(root_uri, system_repo_filename,

   240 						 error);

   241 

   242 	if (!image->uri) {

   243 		razor_set_unref(image->system);

   244 		free(image);

   245 		return NULL;

   246 	}

   247 

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

   249 				    RAZOR_SET_PRIVATE, error)) {

   250 		free(image->uri);

   251 		razor_set_unref(image->system);

   252 		free(image);

   253 		return NULL;

   254 	}

   255 

   256 	return image;

   257 }

   258 

   259 RAZOR_EXPORT struct razor_set *

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

   261 {

   262 	int r;

   263 	char *uri;

   264 	struct razor_set *set;

   265 

   266 	uri = razor_resolve_database_file(root_uri, system_lock_filename,

   267 					  error);

   268 

   269 	if (!uri)

   270 		return NULL;

   271 

   272 	set = razor_set_create_without_root();

   273 	if (set == NULL) {

   274 		free(uri);

   275 		razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

   276 				"Not enough memory");

   277 		return NULL;

   278 	}

   279 

   280 	r = razor_set_acquire_lock(set, uri, 0);

   281 

   282 	free(uri);

   283 

   284 	if (r < 0) {

   285 		razor_set_error(error, RAZOR_GENERAL_ERROR,

   286 				RAZOR_GENERAL_ERROR_DATABASE_LOCKED, NULL,

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

   288 		razor_set_unref(set);

   289 		return NULL;

   290 	}

   291 

   292 	uri = razor_resolve_database_file(root_uri, system_repo_filename,

   293 					  error);

   294 

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

   296 		razor_set_unref(set);

   297 		set = NULL;

   298 	}

   299 

   300 	free(uri);

   301 

   302 	return set;

   303 }

   304 

   305 RAZOR_EXPORT struct razor_set *

   306 razor_root_get_system_set(struct razor_root *root)

   307 {

   308 	assert (root != NULL);

   309 

   310 	return root->system;

   311 }

   312 

   313 RAZOR_EXPORT int

   314 razor_root_close(struct razor_root *root)

   315 {

   316 	assert (root != NULL);

   317 

   318 	razor_set_unref(root->system);

   319 	free(root->uri);

   320 	free(root);

   321 

   322 	return 0;

   323 }

   324 

   325 RAZOR_EXPORT int

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

   327 		  struct razor_atomic *atomic)

   328 {

   329 	int handle, retval;

   330 

   331 	assert (root != NULL);

   332 	assert (next != NULL);

   333 

   334 	handle = razor_atomic_create_file(atomic, root->uri,

   335 					  S_IRWXU | S_IRWXG | S_IRWXO);

   336 	if (handle < 0)

   337 		return handle;

   338 

   339 	razor_set_write_to_handle(next, atomic, handle, RAZOR_SECTION_ALL);

   340 

   341 	retval = razor_atomic_close(atomic, handle);

   342 

   343 	if (!retval) {

   344 		razor_set_unref(root->system);

   345 		root->system = razor_set_ref(next);

   346 	}

   347 

   348 	return retval;

   349 }
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