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librazor/atomic-ktm.c
author J. Ali Harlow <ali@juiblex.co.uk>
Wed Jun 08 15:15:27 2016 +0100 (2016-06-08)
changeset 470 7a38fc77fbde
parent 441 cf499fd51df7
child 475 008c75a5e08d
permissions -rw-r--r--
Fix bug when merging a package with no files 
     1 /*

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

     3  *

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

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

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

     7  * (at your option) any later version.

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

    16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    17  */

    18 

    19 #include "config.h"

    20 

    21 #if HAVE_WINDOWS_KTM

    22 

    23 #include <stdlib.h>

    24 #include <windows.h>

    25 #include <stdio.h>

    26 #include <limits.h>

    27 #include <errno.h>

    28 #include <unistd.h>

    29 #include <fcntl.h>

    30 #include <sys/stat.h>

    31 #include <string.h>

    32 #include <assert.h>

    33 #include <wchar.h>

    34 #include <ktmw32.h>

    35 

    36 #include "razor.h"

    37 #include "razor-internal.h"

    38 

    39 static int

    40 razor_valid_root_name2(const wchar_t *name)

    41 {

    42 	if (razor_allow_all_root_names())

    43 		return !wcschr(name, '/');

    44 

    45 	return RAZOR_ASCII_ISALPHA(name[0]) && name[1] == ':' &&

    46 	       name[2] == '\0';

    47 }

    48 

    49 struct razor_wstr {

    50 	wchar_t *str;

    51 	int len, allocated;

    52 };

    53 

    54 static struct razor_wstr *

    55 razor_wstr_create(const char *init, int len)

    56 {

    57 	int n;

    58 	struct razor_wstr *wstr;

    59 

    60 	wstr = malloc(sizeof(struct razor_wstr));

    61 

    62 	n = MultiByteToWideChar(CP_UTF8, 0, init, len, NULL, 0);

    63 	if (len >= 0 && init[len])

    64 		wstr->len = n++;

    65 	else

    66 		wstr->len = n - 1;

    67 

    68 	wstr->allocated = n * 2;

    69 	wstr->str = malloc(wstr->allocated * sizeof(wchar_t));

    70 	if (!wstr->str) {

    71 		free(wstr);

    72 		return NULL;

    73 	}

    74 

    75 	(void)MultiByteToWideChar(CP_UTF8, 0, init, len, wstr->str, n);

    76 	if (len >= 0 && init[len])

    77 		wstr->str[wstr->len] = 0;

    78 

    79 	return wstr;

    80 }

    81 

    82 static int

    83 razor_wstr_append(struct razor_wstr *wstr, const char *s, int len)

    84 {

    85 	int n, allocated;

    86 	wchar_t *str;

    87 

    88 	n = MultiByteToWideChar(CP_UTF8, 0, s, len, NULL, 0);

    89 	if (len < 0 || !s[len])

    90 		n--;

    91 

    92 	if (wstr->allocated <= wstr->len + n) {

    93 		allocated = (wstr->len + n + 1) * 2;

    94 		str = realloc(wstr->str, allocated * sizeof(wchar_t));

    95 		if (!str)

    96 			return -1;

    97 		wstr->allocated = allocated;

    98 		wstr->str = str;

    99 	}

   100 

   101 	(void)MultiByteToWideChar(CP_UTF8, 0, s, len, wstr->str + wstr->len, n);

   102 	wstr->len += n;

   103 	wstr->str[wstr->len] = 0;

   104 

   105 	return 0;

   106 }

   107 

   108 static void

   109 razor_wstr_destroy(struct razor_wstr *wstr)

   110 {

   111 	free(wstr->str);

   112 	free(wstr);

   113 }

   114 

   115 RAZOR_EXPORT struct razor_atomic *

   116 razor_atomic_open(const char *description)

   117 {

   118 	wchar_t *buf;

   119 	struct razor_atomic *atomic;

   120 

   121 	atomic = zalloc(sizeof *atomic);

   122 	buf = razor_utf8_to_utf16(description, -1);

   123 	atomic->transaction = CreateTransaction(NULL, 0,

   124 						TRANSACTION_DO_NOT_PROMOTE,

   125 						0, 0, 0, buf);

   126 	free(buf);

   127 

   128 	return atomic;

   129 }

   130 

   131 RAZOR_EXPORT int

   132 razor_atomic_commit(struct razor_atomic *atomic)

   133 {

   134 	int retval;

   135 

   136 	if (razor_atomic_in_error_state(atomic))

   137 		return -1;

   138 

   139 	retval = !CommitTransaction(atomic->transaction);

   140 

   141 	if (retval) {

   142 		razor_set_error_mswin(&atomic->error, NULL, GetLastError());

   143 		RollbackTransaction(atomic->transaction);

   144 	}

   145 

   146 	CloseHandle(atomic->transaction);

   147 	atomic->transaction = INVALID_HANDLE_VALUE;

   148 

   149 	return retval;

   150 }

   151 

   152 RAZOR_EXPORT void

   153 razor_atomic_destroy(struct razor_atomic *atomic)

   154 {

   155 	int i;

   156 

   157 	for(i = 0; i < atomic->n_files; i++) {

   158 		if (atomic->files[i].h != INVALID_HANDLE_VALUE) {

   159 			CloseHandle(atomic->files[i].h);

   160 			free(atomic->files[i].path);

   161 		}

   162 	}

   163 	free(atomic->files);

   164 	if (atomic->transaction != INVALID_HANDLE_VALUE) {

   165 		RollbackTransaction(atomic->transaction);

   166 		CloseHandle(atomic->transaction);

   167 	}

   168 	if (atomic->error)

   169 		razor_error_free(atomic->error);

   170 	free(atomic);

   171 }

   172 

   173 RAZOR_EXPORT int

   174 razor_atomic_make_dirs(struct razor_atomic *atomic, const char *root,

   175 		       const char *path)

   176 {

   177 	struct razor_wstr *buffer;

   178 	const char *slash, *next;

   179 	WIN32_FILE_ATTRIBUTE_DATA fa;

   180 	DWORD err;

   181 	int r, creating = 0;

   182 

   183 	if (razor_atomic_in_error_state(atomic))

   184 		return -1;

   185 

   186 	buffer = razor_wstr_create(root, -1);

   187 	slash = buffer->len ? SKIP_DRIVE_LETTER(path) : path;

   188 

   189 	for (; *slash != '\0'; slash = next) {

   190 		next = strpbrk(slash + 1, "/\\");

   191 		if (next == NULL)

   192 			break;

   193 

   194 		razor_wstr_append(buffer, slash, next - slash);

   195 

   196 		if (!creating) {

   197 			if (razor_valid_root_name2(buffer->str))

   198 				continue;

   199 

   200 			r = GetFileAttributesTransactedW(buffer->str,

   201 							 GetFileExInfoStandard,

   202 							 &fa,

   203 							 atomic->transaction);

   204 

   205 			if (!r) {

   206 				err = GetLastError();

   207 				if (err == ERROR_FILE_NOT_FOUND) {

   208 					creating = 1;

   209 				} else {

   210 					razor_set_error_mswin(&atomic->error,

   211 							      buffer->str, err);

   212 					razor_wstr_destroy(buffer);

   213 					return -1;

   214 				}

   215 			} else if (!(fa.dwFileAttributes&

   216 				     FILE_ATTRIBUTE_DIRECTORY)) {

   217 				razor_set_error2(&atomic->error,

   218 						 RAZOR_MSWIN_ERROR,

   219 						 ERROR_DIRECTORY, buffer->str,

   220 						 "Not a directory");

   221 				razor_wstr_destroy(buffer);

   222 				return -1;

   223 			}

   224 		}

   225 		if (creating) {

   226 			if (!CreateDirectoryTransactedW(NULL, buffer->str, NULL,

   227 							atomic->transaction)) {

   228 				razor_set_error_mswin(&atomic->error,

   229 						      buffer->str,

   230 						      GetLastError());

   231 				razor_wstr_destroy(buffer);

   232 				return -1;

   233 			}

   234 

   235 			/* FIXME: What to do about permissions for dirs we

   236 			 * have to create but are not in the cpio archive? */

   237 		}

   238 	}

   239 

   240 	razor_wstr_destroy(buffer);

   241 

   242 	return 0;

   243 }

   244 

   245 RAZOR_EXPORT int

   246 razor_atomic_remove(struct razor_atomic *atomic, const char *path)

   247 {

   248 	wchar_t *buf;

   249 	DWORD err;

   250 

   251 	if (razor_atomic_in_error_state(atomic))

   252 		return -1;

   253 

   254 	buf = razor_utf8_to_utf16(path, -1);

   255 

   256 	if (DeleteFileTransactedW(buf, atomic->transaction)) {

   257 		free(buf);

   258 		return 0;

   259 	}

   260 

   261 	err = GetLastError();

   262 	if (err == ERROR_FILE_NOT_FOUND || err == ERROR_PATH_NOT_FOUND) {

   263 		free(buf);

   264 		return 0;

   265 	}

   266 

   267 	if (SetFileAttributesTransactedW(buf, FILE_ATTRIBUTE_NORMAL,

   268 					 atomic->transaction)) {

   269 		if (DeleteFileTransactedW(buf, atomic->transaction)) {

   270 			free(buf);

   271 			return 0;

   272 		}

   273 		err = GetLastError();

   274 	}

   275 

   276 	if (RemoveDirectoryTransactedW(buf, atomic->transaction) ||

   277 	    GetLastError() == ERROR_DIR_NOT_EMPTY) {

   278 		free(buf);

   279 		return 0;

   280 	}

   281 

   282 	/*

   283 	 * It would be tempting to use:

   284 	 * 	MoveFileEx(path, NULL, MOVEFILE_DELAY_UNTIL_REBOOT)

   285 	 * but unless we can guarantee that the system will be rebooted

   286 	 * before we (or some other application) write another file with the

   287 	 * same path, this is likely to cause more problems than it solves.

   288 	 */

   289 

   290 	razor_set_error_mswin(&atomic->error, buf, err);

   291 	free(buf);

   292 	return -1;

   293 }

   294 

   295 RAZOR_EXPORT int

   296 razor_atomic_rename_file(struct razor_atomic *atomic, const char *oldpath,

   297 			 const char *newpath)

   298 {

   299 	wchar_t *oldbuf, *newbuf;

   300 	const DWORD flags = MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING;

   301 

   302 	if (razor_atomic_in_error_state(atomic))

   303 		return -1;

   304 

   305 	newbuf = razor_utf8_to_utf16(newpath, -1);

   306 	oldbuf = razor_utf8_to_utf16(oldpath, -1);

   307 

   308 	/*

   309 	 * Passing MOVEFILE_REPLACE_EXISTING to MoveFileTransaction() will

   310 	 * cover every case we care about _except_ replacing an empty

   311 	 * directory with a file. Calling RemoveDirectoryTransacted() will deal

   312 	 * with this case while having no effect in all other cases.

   313 	 */

   314 	(void)RemoveDirectoryTransactedW(newbuf, atomic->transaction);

   315 

   316 	if (!MoveFileTransactedW(oldbuf, newbuf, NULL, NULL, flags,

   317 			         atomic->transaction))

   318 		razor_set_error_mswin(&atomic->error, newbuf, GetLastError());

   319 

   320 	free(newbuf);

   321 	free(oldbuf);

   322 

   323 	return razor_atomic_in_error_state(atomic);

   324 }

   325 

   326 RAZOR_EXPORT int

   327 razor_atomic_create_dir(struct razor_atomic *atomic, const char *dirname,

   328 			mode_t mode)

   329 {

   330 	wchar_t *buf;

   331 	DWORD err;

   332 	WIN32_FILE_ATTRIBUTE_DATA fa;

   333 

   334 	if (razor_atomic_in_error_state(atomic))

   335 		return -1;

   336 

   337 	buf = razor_utf8_to_utf16(dirname, -1);

   338 

   339 	if (!CreateDirectoryTransactedW(NULL, buf, NULL, atomic->transaction)) {

   340 		err = GetLastError();

   341 		if (err != ERROR_FILE_EXISTS && err != ERROR_ALREADY_EXISTS) {

   342 abort:

   343 			razor_set_error_mswin(&atomic->error, buf, err);

   344 			free(buf);

   345 			return -1;

   346 		}

   347 

   348 		if (!GetFileAttributesTransactedW(buf, GetFileExInfoStandard,

   349 						  &fa, atomic->transaction))

   350 			goto abort;

   351 

   352 		if (!(fa.dwFileAttributes&FILE_ATTRIBUTE_DIRECTORY)) {

   353 			if (razor_atomic_remove(atomic, dirname)) {

   354 				free(buf);

   355 				return -1;

   356 			}

   357 			if (!CreateDirectoryTransactedW(NULL, buf, NULL,

   358 							atomic->transaction)) {

   359 				err = GetLastError();

   360 				goto abort;

   361 			}

   362 		}

   363 	}

   364 

   365 	free(buf);

   366 

   367 	return 0;

   368 }

   369 

   370 RAZOR_EXPORT int

   371 razor_atomic_create_symlink(struct razor_atomic *atomic, const char *target,

   372 			    const char *path)

   373 {

   374 	if (razor_atomic_in_error_state(atomic))

   375 		return -1;

   376 

   377 	/*

   378 	 * This isn't true, but symbolic links under Windows 7

   379 	 * need to know whether the target is a directory or not

   380 	 * and we don't always know that at the time when the

   381 	 * link is created, so it's a convienent lie for now.

   382 	 */

   383 	razor_set_error(&atomic->error, RAZOR_MSWIN_ERROR, ERROR_NOT_SUPPORTED,

   384 			NULL, "Symbolic links not supported on this platform");

   385 

   386 	return -1;

   387 }

   388 

   389 RAZOR_EXPORT int

   390 razor_atomic_create_file(struct razor_atomic *atomic, const char *filename,

   391 			 mode_t mode)

   392 {

   393 	DWORD attribs;

   394 	struct razor_atomic_file *files;

   395 	int i = atomic->n_files;

   396 

   397 	if (razor_atomic_in_error_state(atomic))

   398 		return -1;

   399 

   400 	files = realloc(atomic->files,

   401 			(atomic->n_files+1) * sizeof(struct razor_atomic_file));

   402 	if (!files) {

   403 		razor_set_error(&atomic->error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

   404 				"Not enough memory");

   405 		return -1;

   406 	}

   407 	atomic->n_files++;

   408 	atomic->files = files;

   409 

   410 	files[i].path = razor_utf8_to_utf16(filename, -1);

   411 

   412 	/*

   413 	 * Passing CREATE_ALWAYS to CreateFileTransacted() will cover

   414 	 * every case we care about _except_ replacing an empty directory

   415 	 * with a file. Calling RemoveDirectoryTransacted() will deal

   416 	 * with this case while having no effect in all other cases.

   417 	 */

   418 	(void)RemoveDirectoryTransactedW(files[i].path, atomic->transaction);

   419 

   420 	if (mode & S_IWUSR)

   421 		attribs = FILE_ATTRIBUTE_NORMAL;

   422 	else

   423 		attribs = FILE_ATTRIBUTE_READONLY;

   424 

   425 	files[i].h = CreateFileTransactedW(files[i].path, GENERIC_WRITE,

   426 					   0, NULL, CREATE_ALWAYS, attribs,

   427 					   NULL, atomic->transaction, NULL,

   428 					   NULL);

   429 

   430 	if (files[i].h == INVALID_HANDLE_VALUE) {

   431 		razor_set_error_mswin(&atomic->error, files[i].path,

   432 				      GetLastError());

   433 		free(files[i].path);

   434 		atomic->n_files--;

   435 		return -1;

   436 	}

   437 

   438 	return i;

   439 }

   440 

   441 RAZOR_EXPORT int

   442 razor_atomic_write(struct razor_atomic *atomic, int handle, const void *data,

   443 		   size_t size)

   444 {

   445 	DWORD written;

   446 

   447 	if (razor_atomic_in_error_state(atomic))

   448 		return -1;

   449 

   450 	assert(handle < atomic->n_files);

   451 	assert(atomic->files[handle].h != INVALID_HANDLE_VALUE);

   452 

   453 	while(size) {

   454 		if (!WriteFile(atomic->files[handle].h, data, size, &written,

   455 			       NULL)) {

   456 			razor_set_error_mswin(&atomic->error,

   457 					      atomic->files[handle].path,

   458 					      GetLastError());

   459 

   460 			(void)CloseHandle(atomic->files[handle].h);

   461 			free(atomic->files[handle].path);

   462 			atomic->files[handle].path = NULL;

   463 			atomic->files[handle].h = INVALID_HANDLE_VALUE;

   464 

   465 			return -1;

   466 		}

   467 

   468 		data += written;

   469 		size -= written;

   470 	}

   471 

   472 	return 0;

   473 }

   474 

   475 RAZOR_EXPORT int

   476 razor_atomic_sync(struct razor_atomic *atomic, int handle)

   477 {

   478 	HANDLE h;

   479 

   480 	if (razor_atomic_in_error_state(atomic))

   481 		return -1;

   482 

   483 	assert(handle < atomic->n_files);

   484 	assert(atomic->files[handle].h != INVALID_HANDLE_VALUE);

   485 

   486 	if (!CloseHandle(atomic->files[handle].h)) {

   487 		razor_set_error_mswin(&atomic->error,

   488 				      atomic->files[handle].path,

   489 				      GetLastError());

   490 		free(atomic->files[handle].path);

   491 		atomic->files[handle].path = NULL;

   492 		atomic->files[handle].h = INVALID_HANDLE_VALUE;

   493 		return -1;

   494 	}

   495 

   496 	h = CreateFileTransactedW(atomic->files[handle].path, GENERIC_WRITE, 0,

   497 				  NULL, OPEN_EXISTING, 0, NULL,

   498 				  atomic->transaction, NULL, NULL);

   499 	atomic->files[handle].h = h;

   500 

   501 	if (atomic->files[handle].h == INVALID_HANDLE_VALUE) {

   502 		razor_set_error_mswin(&atomic->error,

   503 				      atomic->files[handle].path,

   504 				      GetLastError());

   505 		free(atomic->files[handle].path);

   506 		atomic->files[handle].path = NULL;

   507 		return -1;

   508 	}

   509 

   510 	return razor_atomic_in_error_state(atomic);

   511 }

   512 

   513 RAZOR_EXPORT int

   514 razor_atomic_close(struct razor_atomic *atomic, int handle)

   515 {

   516 	if (razor_atomic_in_error_state(atomic))

   517 		return -1;

   518 

   519 	assert(handle < atomic->n_files);

   520 	assert(atomic->files[handle].h != INVALID_HANDLE_VALUE);

   521 

   522 	if (!CloseHandle(atomic->files[handle].h))

   523 		razor_set_error_mswin(&atomic->error,

   524 				      atomic->files[handle].path,

   525 				      GetLastError());

   526 

   527 	free(atomic->files[handle].path);

   528 	atomic->files[handle].path = NULL;

   529 	atomic->files[handle].h = INVALID_HANDLE_VALUE;

   530 

   531 	while(atomic->n_files > 0 &&

   532 	      atomic->files[atomic->n_files-1].h == INVALID_HANDLE_VALUE)

   533 		atomic->n_files--;

   534 

   535 	return razor_atomic_in_error_state(atomic);

   536 }

   537 

   538 #endif		/* HAVE_WINDOWS_KTM */
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