summaryrefslogtreecommitdiff
path: root/lib/libalpm/trans.c
blob: 64bec84e8f2062f480c95f3a0fadfe6318ff68e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
/*
 *  trans.c
 *
 *  Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
 *  Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
 *
 *  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, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <errno.h>

/* libalpm */
#include "trans.h"
#include "alpm_list.h"
#include "package.h"
#include "util.h"
#include "log.h"
#include "handle.h"
#include "add.h"
#include "remove.h"
#include "sync.h"
#include "alpm.h"
#include "deps.h"
#include "cache.h"

/** \addtogroup alpm_trans Transaction Functions
 * @brief Functions to manipulate libalpm transactions
 * @{
 */

/** Initialize the transaction.
 * @param type type of the transaction
 * @param flags flags of the transaction (like nodeps, etc)
 * @param event event callback function pointer
 * @param conv question callback function pointer
 * @param progress progress callback function pointer
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_init(pmtranstype_t type, pmtransflag_t flags,
                              alpm_trans_cb_event event, alpm_trans_cb_conv conv,
                              alpm_trans_cb_progress progress)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));

	ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, -1));

	/* lock db */
	if(!(flags & PM_TRANS_FLAG_NOLOCK)) {
		handle->lckfd = _alpm_lckmk();
		if(handle->lckfd == -1) {
			RET_ERR(PM_ERR_HANDLE_LOCK, -1);
		}
	}

	handle->trans = _alpm_trans_new();
	if(handle->trans == NULL) {
		RET_ERR(PM_ERR_MEMORY, -1);
	}

	return(_alpm_trans_init(handle->trans, type, flags, event, conv, progress));
}

/** Search for packages to upgrade and add them to the transaction.
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_sysupgrade()
{
	pmtrans_t *trans;

	ALPM_LOG_FUNC;

	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));
	ASSERT(trans->type == PM_TRANS_TYPE_SYNC, RET_ERR(PM_ERR_TRANS_TYPE, -1));

	return(_alpm_sync_sysupgrade(trans, handle->db_local, handle->dbs_sync));
}

/** Add a target to the transaction.
 * @param target the name of the target to add
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_addtarget(char *target)
{
	pmtrans_t *trans;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
	ASSERT(target != NULL && strlen(target) != 0, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));

	return(_alpm_trans_addtarget(trans, target));
}

/** Prepare a transaction.
 * @param data the address of an alpm_list where detailed description
 * of an error can be dumped (ie. list of conflicting files)
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_prepare(alpm_list_t **data)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
	ASSERT(data != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	ASSERT(handle->trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(handle->trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));

	return(_alpm_trans_prepare(handle->trans, data));
}

/** Commit a transaction.
 * @param data the address of an alpm_list where detailed description
 * of an error can be dumped (ie. list of conflicting files)
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_commit(alpm_list_t **data)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));

	ASSERT(handle->trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(handle->trans->state == STATE_PREPARED, RET_ERR(PM_ERR_TRANS_NOT_PREPARED, -1));

	ASSERT(!(handle->trans->flags & PM_TRANS_FLAG_NOLOCK), RET_ERR(PM_ERR_TRANS_NOT_LOCKED, -1));

	return(_alpm_trans_commit(handle->trans, data));
}

/** Interrupt a transaction.
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_interrupt()
{
	pmtrans_t *trans;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_COMMITING || trans->state == STATE_INTERRUPTED,
			RET_ERR(PM_ERR_TRANS_TYPE, -1));

	trans->state = STATE_INTERRUPTED;

	return(0);
}

/** Release a transaction.
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_trans_release()
{
	pmtrans_t *trans;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state != STATE_IDLE, RET_ERR(PM_ERR_TRANS_NULL, -1));

	unsigned int nolock_flag = trans->flags & PM_TRANS_FLAG_NOLOCK;

	_alpm_trans_free(trans);
	handle->trans = NULL;

	/* unlock db */
	if(!nolock_flag) {
		if(handle->lckfd != -1) {
			while(close(handle->lckfd) == -1 && errno == EINTR);
			handle->lckfd = -1;
		}
		if(_alpm_lckrm()) {
			_alpm_log(PM_LOG_WARNING, _("could not remove lock file %s\n"),
					alpm_option_get_lockfile());
			alpm_logaction("warning: could not remove lock file %s\n",
					alpm_option_get_lockfile());
		}
	}

	return(0);
}

/** @} */

pmtrans_t *_alpm_trans_new()
{
	pmtrans_t *trans;

	ALPM_LOG_FUNC;

	CALLOC(trans, 1, sizeof(pmtrans_t), RET_ERR(PM_ERR_MEMORY, NULL));
	trans->state = STATE_IDLE;

	return(trans);
}

void _alpm_trans_free(pmtrans_t *trans)
{
	ALPM_LOG_FUNC;

	if(trans == NULL) {
		return;
	}

	if(trans->type == PM_TRANS_TYPE_SYNC) {
		alpm_list_t *i;
		for(i = trans->packages; i; i = i->next) {
			pmpkg_t *pkg = i->data;
			alpm_list_free(pkg->removes);
			pkg->removes = NULL;
		}
	} else {
		alpm_list_free_inner(trans->packages, (alpm_list_fn_free)_alpm_pkg_free);
	}
	alpm_list_free(trans->packages);

	FREELIST(trans->skip_add);
	FREELIST(trans->skip_remove);

	FREE(trans);
}

int _alpm_trans_init(pmtrans_t *trans, pmtranstype_t type, pmtransflag_t flags,
                     alpm_trans_cb_event event, alpm_trans_cb_conv conv,
                     alpm_trans_cb_progress progress)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));

	trans->type = type;
	trans->flags = flags;
	trans->cb_event = event;
	trans->cb_conv = conv;
	trans->cb_progress = progress;
	trans->state = STATE_INITIALIZED;

	return(0);
}

/** Add a target to the transaction.
 * @param trans the current transaction
 * @param target the name of the target to add
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int _alpm_trans_addtarget(pmtrans_t *trans, char *target)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(target != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	switch(trans->type) {
		case PM_TRANS_TYPE_UPGRADE:
			if(_alpm_add_loadtarget(trans, handle->db_local, target) == -1) {
				/* pm_errno is set by _alpm_add_loadtarget() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_REMOVE:
		case PM_TRANS_TYPE_REMOVEUPGRADE:
			if(_alpm_remove_loadtarget(trans, handle->db_local, target) == -1) {
				/* pm_errno is set by _alpm_remove_loadtarget() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_SYNC:
			if(_alpm_sync_addtarget(trans, handle->db_local, handle->dbs_sync, target) == -1) {
				/* pm_errno is set by _alpm_sync_loadtarget() */
				return(-1);
			}
		break;
	}

	return(0);
}

int _alpm_trans_prepare(pmtrans_t *trans, alpm_list_t **data)
{
	if(data) {
		*data = NULL;
	}

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));

	/* If there's nothing to do, return without complaining */
	if(trans->packages == NULL) {
		return(0);
	}

	switch(trans->type) {
		case PM_TRANS_TYPE_UPGRADE:
			if(_alpm_add_prepare(trans, handle->db_local, data) == -1) {
				/* pm_errno is set by _alpm_add_prepare() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_REMOVE:
		case PM_TRANS_TYPE_REMOVEUPGRADE:
			if(_alpm_remove_prepare(trans, handle->db_local, data) == -1) {
				/* pm_errno is set by _alpm_remove_prepare() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_SYNC:
			if(_alpm_sync_prepare(trans, handle->db_local, handle->dbs_sync, data) == -1) {
				/* pm_errno is set by _alpm_sync_prepare() */
				return(-1);
			}
		break;
	}

	trans->state = STATE_PREPARED;

	return(0);
}

int _alpm_trans_commit(pmtrans_t *trans, alpm_list_t **data)
{
	ALPM_LOG_FUNC;

	if(data!=NULL)
		*data = NULL;

	/* Sanity checks */
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));

	/* If there's nothing to do, return without complaining */
	if(trans->packages == NULL) {
		return(0);
	}

	trans->state = STATE_COMMITING;

	switch(trans->type) {
		case PM_TRANS_TYPE_UPGRADE:
			if(_alpm_add_commit(trans, handle->db_local) == -1) {
				/* pm_errno is set by _alpm_add_commit() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_REMOVE:
		case PM_TRANS_TYPE_REMOVEUPGRADE:
			if(_alpm_remove_commit(trans, handle->db_local) == -1) {
				/* pm_errno is set by _alpm_remove_commit() */
				return(-1);
			}
		break;
		case PM_TRANS_TYPE_SYNC:
			if(_alpm_sync_commit(trans, handle->db_local, data) == -1) {
				/* pm_errno is set by _alpm_sync_commit() */
				return(-1);
			}
		break;
	}

	trans->state = STATE_COMMITED;

	return(0);
}

/* A cheap grep for text files, returns 1 if a substring
 * was found in the text file fn, 0 if it wasn't
 */
static int grep(const char *fn, const char *needle)
{
	FILE *fp;

	if((fp = fopen(fn, "r")) == NULL) {
		return(0);
	}
	while(!feof(fp)) {
		char line[1024];
		fgets(line, 1024, fp);
		if(feof(fp)) {
			continue;
		}
		if(strstr(line, needle)) {
			fclose(fp);
			return(1);
		}
	}
	fclose(fp);
	return(0);
}

int _alpm_runscriptlet(const char *root, const char *installfn,
											 const char *script, const char *ver,
											 const char *oldver, pmtrans_t *trans)
{
	char scriptfn[PATH_MAX];
	char cmdline[PATH_MAX];
	char tmpdir[PATH_MAX];
	char cwd[PATH_MAX];
	char *scriptpath;
	pid_t pid;
	int clean_tmpdir = 0;
	int restore_cwd = 0;
	int retval = 0;

	ALPM_LOG_FUNC;

	if(access(installfn, R_OK)) {
		/* not found */
		_alpm_log(PM_LOG_DEBUG, "scriptlet '%s' not found\n", installfn);
		return(0);
	}

	/* creates a directory in $root/tmp/ for copying/extracting the scriptlet */
	snprintf(tmpdir, PATH_MAX, "%stmp/", root);
	if(access(tmpdir, F_OK) != 0) {
		_alpm_makepath_mode(tmpdir, 01777);
	}
	snprintf(tmpdir, PATH_MAX, "%stmp/alpm_XXXXXX", root);
	if(mkdtemp(tmpdir) == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not create temp directory\n"));
		return(1);
	} else {
		clean_tmpdir = 1;
	}

	/* either extract or copy the scriptlet */
	snprintf(scriptfn, PATH_MAX, "%s/.INSTALL", tmpdir);
	if(!strcmp(script, "pre_upgrade") || !strcmp(script, "pre_install")) {
		if(_alpm_unpack(installfn, tmpdir, ".INSTALL")) {
			retval = 1;
		}
	} else {
		if(_alpm_copyfile(installfn, scriptfn)) {
			_alpm_log(PM_LOG_ERROR, _("could not copy tempfile to %s (%s)\n"), scriptfn, strerror(errno));
			retval = 1;
		}
	}
	if(retval == 1) {
		goto cleanup;
	}

	/* chop off the root so we can find the tmpdir in the chroot */
	scriptpath = scriptfn + strlen(root) - 1;

	if(!grep(scriptfn, script)) {
		/* script not found in scriptlet file */
		goto cleanup;
	}

	/* save the cwd so we can restore it later */
	if(getcwd(cwd, PATH_MAX) == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not get current working directory\n"));
	} else {
		restore_cwd = 1;
	}

	/* just in case our cwd was removed in the upgrade operation */
	if(chdir(root) != 0) {
		_alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), root, strerror(errno));
		goto cleanup;
	}

	_alpm_log(PM_LOG_DEBUG, "executing %s script...\n", script);

	if(oldver) {
		snprintf(cmdline, PATH_MAX, ". %s; %s %s %s",
				scriptpath, script, ver, oldver);
	} else {
		snprintf(cmdline, PATH_MAX, ". %s; %s %s",
				scriptpath, script, ver);
	}
	_alpm_log(PM_LOG_DEBUG, "%s\n", cmdline);

	/* Flush open fds before fork() to avoid cloning buffers */
	fflush(NULL);

	/* fork- parent and child each have seperate code blocks below */
	pid = fork();
	if(pid == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not fork a new process (%s)\n"), strerror(errno));
		retval = 1;
		goto cleanup;
	}

	if(pid == 0) {
		FILE *pipe;
		/* this code runs for the child only (the actual chroot/exec) */
		_alpm_log(PM_LOG_DEBUG, "chrooting in %s\n", root);
		if(chroot(root) != 0) {
			_alpm_log(PM_LOG_ERROR, _("could not change the root directory (%s)\n"),
					strerror(errno));
			exit(1);
		}
		if(chdir("/") != 0) {
			_alpm_log(PM_LOG_ERROR, _("could not change directory to / (%s)\n"),
					strerror(errno));
			exit(1);
		}
		umask(0022);
		_alpm_log(PM_LOG_DEBUG, "executing \"%s\"\n", cmdline);
		/* execl("/bin/sh", "sh", "-c", cmdline, (char *)NULL); */
		pipe = popen(cmdline, "r");
		if(!pipe) {
			_alpm_log(PM_LOG_ERROR, _("call to popen failed (%s)"),
					strerror(errno));
			exit(1);
		}
		while(!feof(pipe)) {
			char line[PATH_MAX];
			if(fgets(line, PATH_MAX, pipe) == NULL)
				break;
			alpm_logaction("%s", line);
			EVENT(trans, PM_TRANS_EVT_SCRIPTLET_INFO, line, NULL);
		}
		retval = pclose(pipe);
		exit(WEXITSTATUS(retval));
	} else {
		/* this code runs for the parent only (wait on the child) */
		pid_t retpid;
		int status;
		while((retpid = waitpid(pid, &status, 0)) == -1 && errno == EINTR);
		if(retpid == -1) {
			_alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"),
			          strerror(errno));
			retval = 1;
			goto cleanup;
		} else {
			/* check the return status, make sure it is 0 (success) */
			if(WIFEXITED(status)) {
				_alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n");
				if(WEXITSTATUS(status) != 0) {
					_alpm_log(PM_LOG_ERROR, _("scriptlet failed to execute correctly\n"));
					retval = 1;
				}
			}
		}
	}

cleanup:
	if(clean_tmpdir && _alpm_rmrf(tmpdir)) {
		_alpm_log(PM_LOG_WARNING, _("could not remove tmpdir %s\n"), tmpdir);
	}
	if(restore_cwd) {
		chdir(cwd);
	}

	return(retval);
}

pmtranstype_t SYMEXPORT alpm_trans_get_type()
{
	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(handle->trans != NULL, return(-1));

	return handle->trans->type;
}

unsigned int SYMEXPORT alpm_trans_get_flags()
{
	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(handle->trans != NULL, return(-1));

	return handle->trans->flags;
}

alpm_list_t SYMEXPORT * alpm_trans_get_pkgs()
{
	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(handle->trans != NULL, return(NULL));

	return handle->trans->packages;
}
/* vim: set ts=2 sw=2 noet: */