summaryrefslogtreecommitdiffstats
path: root/lib/libalpm/sync.c
blob: f179f8e7a9ef24e2c40425d8371b57b4fc399116 (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
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
/*
 *  sync.c
 *
 *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 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 <sys/types.h> /* off_t */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h> /* intmax_t */
#include <unistd.h>
#include <limits.h>

/* libalpm */
#include "sync.h"
#include "alpm_list.h"
#include "log.h"
#include "package.h"
#include "db.h"
#include "deps.h"
#include "conflict.h"
#include "trans.h"
#include "add.h"
#include "util.h"
#include "handle.h"
#include "alpm.h"
#include "dload.h"
#include "delta.h"
#include "remove.h"
#include "diskspace.h"
#include "signing.h"

/** Check for new version of pkg in sync repos
 * (only the first occurrence is considered in sync)
 */
alpm_pkg_t SYMEXPORT *alpm_sync_newversion(alpm_pkg_t *pkg, alpm_list_t *dbs_sync)
{
	alpm_list_t *i;
	alpm_pkg_t *spkg = NULL;

	ASSERT(pkg != NULL, return NULL);
	pkg->handle->pm_errno = 0;

	for(i = dbs_sync; !spkg && i; i = i->next) {
		spkg = _alpm_db_get_pkgfromcache(i->data, alpm_pkg_get_name(pkg));
	}

	if(spkg == NULL) {
		_alpm_log(pkg->handle, ALPM_LOG_DEBUG, "'%s' not found in sync db => no upgrade\n",
				alpm_pkg_get_name(pkg));
		return NULL;
	}

	/* compare versions and see if spkg is an upgrade */
	if(_alpm_pkg_compare_versions(spkg, pkg) > 0) {
		_alpm_log(pkg->handle, ALPM_LOG_DEBUG, "new version of '%s' found (%s => %s)\n",
					alpm_pkg_get_name(pkg), alpm_pkg_get_version(pkg),
					alpm_pkg_get_version(spkg));
		return spkg;
	}
	/* spkg is not an upgrade */
	return NULL;
}

/** Search for packages to upgrade and add them to the transaction. */
int SYMEXPORT alpm_sync_sysupgrade(alpm_handle_t *handle, int enable_downgrade)
{
	alpm_list_t *i, *j, *k;
	alpm_trans_t *trans;
	alpm_db_t *db_local;
	alpm_list_t *dbs_sync;

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

	_alpm_log(handle, ALPM_LOG_DEBUG, "checking for package upgrades\n");
	for(i = _alpm_db_get_pkgcache(db_local); i; i = i->next) {
		alpm_pkg_t *lpkg = i->data;

		if(_alpm_pkg_find(trans->add, lpkg->name)) {
			_alpm_log(handle, ALPM_LOG_DEBUG, "%s is already in the target list -- skipping\n", lpkg->name);
			continue;
		}

		/* Search for literal then replacers in each sync database.
		 * If found, don't check other databases */
		for(j = dbs_sync; j; j = j->next) {
			alpm_db_t *sdb = j->data;
			/* Check sdb */
			alpm_pkg_t *spkg = _alpm_db_get_pkgfromcache(sdb, lpkg->name);
			if(spkg) {
				/* 1. literal was found in sdb */
				int cmp = _alpm_pkg_compare_versions(spkg, lpkg);
				if(cmp > 0) {
					_alpm_log(handle, ALPM_LOG_DEBUG, "new version of '%s' found (%s => %s)\n",
								lpkg->name, lpkg->version, spkg->version);
					/* check IgnorePkg/IgnoreGroup */
					if(_alpm_pkg_should_ignore(handle, spkg)
							|| _alpm_pkg_should_ignore(handle, lpkg)) {
						_alpm_log(handle, ALPM_LOG_WARNING, _("%s: ignoring package upgrade (%s => %s)\n"),
								lpkg->name, lpkg->version, spkg->version);
					} else {
						_alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s-%s to the transaction targets\n",
												spkg->name, spkg->version);
						trans->add = alpm_list_add(trans->add, spkg);
					}
				} else if(cmp < 0) {
					if(enable_downgrade) {
						/* check IgnorePkg/IgnoreGroup */
						if(_alpm_pkg_should_ignore(handle, spkg)
								|| _alpm_pkg_should_ignore(handle, lpkg)) {
							_alpm_log(handle, ALPM_LOG_WARNING, _("%s: ignoring package downgrade (%s => %s)\n"),
											lpkg->name, lpkg->version, spkg->version);
						} else {
							_alpm_log(handle, ALPM_LOG_WARNING, _("%s: downgrading from version %s to version %s\n"),
											lpkg->name, lpkg->version, spkg->version);
							trans->add = alpm_list_add(trans->add, spkg);
						}
					} else {
						_alpm_log(handle, ALPM_LOG_WARNING, _("%s: local (%s) is newer than %s (%s)\n"),
								lpkg->name, lpkg->version, sdb->treename, spkg->version);
					}
				}
				/* jump to next local package */
				break;
			} else {
				/* 2. search for replacers in sdb */
				int found = 0;
				for(k = _alpm_db_get_pkgcache(sdb); k; k = k->next) {
					spkg = k->data;
					if(alpm_list_find_str(alpm_pkg_get_replaces(spkg), lpkg->name)) {
						found = 1;
						/* check IgnorePkg/IgnoreGroup */
						if(_alpm_pkg_should_ignore(handle, spkg)
								|| _alpm_pkg_should_ignore(handle, lpkg)) {
							_alpm_log(handle, ALPM_LOG_WARNING, _("ignoring package replacement (%s-%s => %s-%s)\n"),
										lpkg->name, lpkg->version, spkg->name, spkg->version);
							continue;
						}

						int doreplace = 0;
						QUESTION(trans, ALPM_TRANS_CONV_REPLACE_PKG, lpkg, spkg, sdb->treename, &doreplace);
						if(!doreplace) {
							continue;
						}

						/* If spkg is already in the target list, we append lpkg to spkg's
						 * removes list */
						alpm_pkg_t *tpkg = _alpm_pkg_find(trans->add, spkg->name);
						if(tpkg) {
							/* sanity check, multiple repos can contain spkg->name */
							if(tpkg->origin_data.db != sdb) {
								_alpm_log(handle, ALPM_LOG_WARNING, _("cannot replace %s by %s\n"),
													lpkg->name, spkg->name);
								continue;
							}
							_alpm_log(handle, ALPM_LOG_DEBUG, "appending %s to the removes list of %s\n",
												lpkg->name, tpkg->name);
							tpkg->removes = alpm_list_add(tpkg->removes, lpkg);
							/* check the to-be-replaced package's reason field */
							if(alpm_pkg_get_reason(lpkg) == ALPM_PKG_REASON_EXPLICIT) {
								tpkg->reason = ALPM_PKG_REASON_EXPLICIT;
							}
						} else {
							/* add spkg to the target list */
							/* copy over reason */
							spkg->reason = alpm_pkg_get_reason(lpkg);
							spkg->removes = alpm_list_add(NULL, lpkg);
							_alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s-%s to the transaction targets\n",
													spkg->name, spkg->version);
							trans->add = alpm_list_add(trans->add, spkg);
						}
					}
				}
				if(found) {
					break; /* jump to next local package */
				}
			}
		}
	}

	return 0;
}

/** Find group members across a list of databases.
 * If a member exists in several databases, only the first database is used.
 * IgnorePkg is also handled.
 * @param dbs the list of alpm_db_t *
 * @pram name the name of the group
 * @return the list of alpm_pkg_t * (caller is responsible for alpm_list_free)
 */
alpm_list_t SYMEXPORT *alpm_find_group_pkgs(alpm_list_t *dbs,
		const char *name)
{
	alpm_list_t *i, *j, *pkgs = NULL, *ignorelist = NULL;

	for(i = dbs; i; i = i->next) {
		alpm_db_t *db = i->data;
		alpm_group_t *grp = alpm_db_readgroup(db, name);

		if(!grp)
			continue;

		for(j = grp->packages; j; j = j->next) {
			alpm_pkg_t *pkg = j->data;

			if(_alpm_pkg_find(ignorelist, alpm_pkg_get_name(pkg))) {
				continue;
			}
			if(_alpm_pkg_should_ignore(db->handle, pkg)) {
				ignorelist = alpm_list_add(ignorelist, pkg);
				int install = 0;
				QUESTION(db->handle->trans, ALPM_TRANS_CONV_INSTALL_IGNOREPKG, pkg,
						NULL, NULL, &install);
				if(!install)
					continue;
			}
			if(!_alpm_pkg_find(pkgs, alpm_pkg_get_name(pkg))) {
				pkgs = alpm_list_add(pkgs, pkg);
			}
		}
	}
	alpm_list_free(ignorelist);
	return pkgs;
}

/** Compute the size of the files that will be downloaded to install a
 * package.
 * @param newpkg the new package to upgrade to
 */
static int compute_download_size(alpm_pkg_t *newpkg)
{
	const char *fname;
	char *fpath;
	off_t size = 0;
	alpm_handle_t *handle = newpkg->handle;

	if(newpkg->origin != PKG_FROM_SYNCDB) {
		newpkg->infolevel |= INFRQ_DSIZE;
		newpkg->download_size = 0;
		return 0;
	}

	fname = alpm_pkg_get_filename(newpkg);
	ASSERT(fname != NULL, RET_ERR(handle, PM_ERR_PKG_INVALID_NAME, -1));
	fpath = _alpm_filecache_find(handle, fname);

	if(fpath) {
		FREE(fpath);
		size = 0;
	} else if(handle->usedelta) {
		off_t dltsize;
		off_t pkgsize = alpm_pkg_get_size(newpkg);

		dltsize = _alpm_shortest_delta_path(handle,
			alpm_pkg_get_deltas(newpkg),
			alpm_pkg_get_filename(newpkg),
			&newpkg->delta_path);

		if(newpkg->delta_path && (dltsize < pkgsize * MAX_DELTA_RATIO)) {
			_alpm_log(handle, ALPM_LOG_DEBUG, "using delta size\n");
			size = dltsize;
		} else {
			_alpm_log(handle, ALPM_LOG_DEBUG, "using package size\n");
			size = alpm_pkg_get_size(newpkg);
			alpm_list_free(newpkg->delta_path);
			newpkg->delta_path = NULL;
		}
	} else {
		size = alpm_pkg_get_size(newpkg);
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "setting download size %jd for pkg %s\n",
			(intmax_t)size, alpm_pkg_get_name(newpkg));

	newpkg->infolevel |= INFRQ_DSIZE;
	newpkg->download_size = size;
	return 0;
}

int _alpm_sync_prepare(alpm_handle_t *handle, alpm_list_t **data)
{
	alpm_list_t *i, *j;
	alpm_list_t *deps = NULL;
	alpm_list_t *unresolvable = NULL;
	alpm_list_t *remove = NULL;
	int ret = 0;
	alpm_trans_t *trans = handle->trans;

	if(data) {
		*data = NULL;
	}

	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
		alpm_list_t *resolved = NULL; /* target list after resolvedeps */

		/* Build up list by repeatedly resolving each transaction package */
		/* Resolve targets dependencies */
		EVENT(trans, ALPM_TRANS_EVT_RESOLVEDEPS_START, NULL, NULL);
		_alpm_log(handle, ALPM_LOG_DEBUG, "resolving target's dependencies\n");

		/* build remove list for resolvedeps */
		for(i = trans->add; i; i = i->next) {
			alpm_pkg_t *spkg = i->data;
			for(j = spkg->removes; j; j = j->next) {
				remove = alpm_list_add(remove, j->data);
			}
		}

		/* Compute the fake local database for resolvedeps (partial fix for the
		 * phonon/qt issue) */
		alpm_list_t *localpkgs = alpm_list_diff(_alpm_db_get_pkgcache(handle->db_local),
				trans->add, _alpm_pkg_cmp);

		/* Resolve packages in the transaction one at a time, in addition
		   building up a list of packages which could not be resolved. */
		for(i = trans->add; i; i = i->next) {
			alpm_pkg_t *pkg = i->data;
			if(_alpm_resolvedeps(handle, localpkgs, pkg, trans->add,
						&resolved, remove, data) == -1) {
				unresolvable = alpm_list_add(unresolvable, pkg);
			}
			/* Else, [resolved] now additionally contains [pkg] and all of its
			   dependencies not already on the list */
		}
		alpm_list_free(localpkgs);

		/* If there were unresolvable top-level packages, prompt the user to
		   see if they'd like to ignore them rather than failing the sync */
		if(unresolvable != NULL) {
			int remove_unresolvable = 0;
			QUESTION(trans, ALPM_TRANS_CONV_REMOVE_PKGS, unresolvable,
					NULL, NULL, &remove_unresolvable);
			if(remove_unresolvable) {
				/* User wants to remove the unresolvable packages from the
				   transaction. The packages will be removed from the actual
				   transaction when the transaction packages are replaced with a
				   dependency-reordered list below */
				handle->pm_errno = 0; /* pm_errno was set by resolvedeps */
				if(data) {
					alpm_list_free_inner(*data, (alpm_list_fn_free)_alpm_depmiss_free);
					alpm_list_free(*data);
					*data = NULL;
				}
			} else {
				/* pm_errno is set by resolvedeps */
				alpm_list_free(resolved);
				ret = -1;
				goto cleanup;
			}
		}

		/* Set DEPEND reason for pulled packages */
		for(i = resolved; i; i = i->next) {
			alpm_pkg_t *pkg = i->data;
			if(!_alpm_pkg_find(trans->add, pkg->name)) {
				pkg->reason = ALPM_PKG_REASON_DEPEND;
			}
		}

		/* Unresolvable packages will be removed from the target list, so
		   we free the transaction specific fields */
		alpm_list_free_inner(unresolvable, (alpm_list_fn_free)_alpm_pkg_free_trans);

		/* re-order w.r.t. dependencies */
		alpm_list_free(trans->add);
		trans->add = _alpm_sortbydeps(handle, resolved, 0);
		alpm_list_free(resolved);

		EVENT(trans, ALPM_TRANS_EVT_RESOLVEDEPS_DONE, NULL, NULL);
	}

	if(!(trans->flags & ALPM_TRANS_FLAG_NOCONFLICTS)) {
		/* check for inter-conflicts and whatnot */
		EVENT(trans, ALPM_TRANS_EVT_INTERCONFLICTS_START, NULL, NULL);

		_alpm_log(handle, ALPM_LOG_DEBUG, "looking for conflicts\n");

		/* 1. check for conflicts in the target list */
		_alpm_log(handle, ALPM_LOG_DEBUG, "check targets vs targets\n");
		deps = _alpm_innerconflicts(handle, trans->add);

		for(i = deps; i; i = i->next) {
			alpm_conflict_t *conflict = i->data;
			alpm_pkg_t *rsync, *sync, *sync1, *sync2;

			/* have we already removed one of the conflicting targets? */
			sync1 = _alpm_pkg_find(trans->add, conflict->package1);
			sync2 = _alpm_pkg_find(trans->add, conflict->package2);
			if(!sync1 || !sync2) {
				continue;
			}

			_alpm_log(handle, ALPM_LOG_DEBUG, "conflicting packages in the sync list: '%s' <-> '%s'\n",
					conflict->package1, conflict->package2);

			/* if sync1 provides sync2, we remove sync2 from the targets, and vice versa */
			alpm_depend_t *dep1 = _alpm_splitdep(conflict->package1);
			alpm_depend_t *dep2 = _alpm_splitdep(conflict->package2);
			if(_alpm_depcmp(sync1, dep2)) {
				rsync = sync2;
				sync = sync1;
			} else if(_alpm_depcmp(sync2, dep1)) {
				rsync = sync1;
				sync = sync2;
			} else {
				_alpm_log(handle, ALPM_LOG_ERROR, _("unresolvable package conflicts detected\n"));
				handle->pm_errno = PM_ERR_CONFLICTING_DEPS;
				ret = -1;
				if(data) {
					alpm_conflict_t *newconflict = _alpm_conflict_dup(conflict);
					if(newconflict) {
						*data = alpm_list_add(*data, newconflict);
					}
				}
				alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
				alpm_list_free(deps);
				_alpm_dep_free(dep1);
				_alpm_dep_free(dep2);
				goto cleanup;
			}
			_alpm_dep_free(dep1);
			_alpm_dep_free(dep2);

			/* Prints warning */
			_alpm_log(handle, ALPM_LOG_WARNING,
					_("removing '%s' from target list because it conflicts with '%s'\n"),
					rsync->name, sync->name);
			trans->add = alpm_list_remove(trans->add, rsync, _alpm_pkg_cmp, NULL);
			_alpm_pkg_free_trans(rsync); /* rsync is not transaction target anymore */
			continue;
		}

		alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
		alpm_list_free(deps);
		deps = NULL;

		/* 2. we check for target vs db conflicts (and resolve)*/
		_alpm_log(handle, ALPM_LOG_DEBUG, "check targets vs db and db vs targets\n");
		deps = _alpm_outerconflicts(handle->db_local, trans->add);

		for(i = deps; i; i = i->next) {
			alpm_conflict_t *conflict = i->data;

			/* if conflict->package2 (the local package) is not elected for removal,
			   we ask the user */
			int found = 0;
			for(j = trans->add; j && !found; j = j->next) {
				alpm_pkg_t *spkg = j->data;
				if(_alpm_pkg_find(spkg->removes, conflict->package2)) {
					found = 1;
				}
			}
			if(found) {
				continue;
			}

			_alpm_log(handle, ALPM_LOG_DEBUG, "package '%s' conflicts with '%s'\n",
					conflict->package1, conflict->package2);

			alpm_pkg_t *sync = _alpm_pkg_find(trans->add, conflict->package1);
			alpm_pkg_t *local = _alpm_db_get_pkgfromcache(handle->db_local, conflict->package2);
			int doremove = 0;
			QUESTION(trans, ALPM_TRANS_CONV_CONFLICT_PKG, conflict->package1,
							conflict->package2, conflict->reason, &doremove);
			if(doremove) {
				/* append to the removes list */
				_alpm_log(handle, ALPM_LOG_DEBUG, "electing '%s' for removal\n", conflict->package2);
				sync->removes = alpm_list_add(sync->removes, local);
			} else { /* abort */
				_alpm_log(handle, ALPM_LOG_ERROR, _("unresolvable package conflicts detected\n"));
				handle->pm_errno = PM_ERR_CONFLICTING_DEPS;
				ret = -1;
				if(data) {
					alpm_conflict_t *newconflict = _alpm_conflict_dup(conflict);
					if(newconflict) {
						*data = alpm_list_add(*data, newconflict);
					}
				}
				alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
				alpm_list_free(deps);
				goto cleanup;
			}
		}
		EVENT(trans, ALPM_TRANS_EVT_INTERCONFLICTS_DONE, NULL, NULL);
		alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
		alpm_list_free(deps);
	}

	/* Build trans->remove list */
	for(i = trans->add; i; i = i->next) {
		alpm_pkg_t *spkg = i->data;
		for(j = spkg->removes; j; j = j->next) {
			alpm_pkg_t *rpkg = j->data;
			if(!_alpm_pkg_find(trans->remove, rpkg->name)) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "adding '%s' to remove list\n", rpkg->name);
				trans->remove = alpm_list_add(trans->remove, _alpm_pkg_dup(rpkg));
			}
		}
	}

	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "checking dependencies\n");
		deps = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local),
				trans->remove, trans->add, 1);
		if(deps) {
			handle->pm_errno = PM_ERR_UNSATISFIED_DEPS;
			ret = -1;
			if(data) {
				*data = deps;
			} else {
				alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_depmiss_free);
				alpm_list_free(deps);
			}
			goto cleanup;
		}
	}
	for(i = trans->add; i; i = i->next) {
		/* update download size field */
		alpm_pkg_t *spkg = i->data;
		if(compute_download_size(spkg) != 0) {
			ret = -1;
			goto cleanup;
		}
	}

cleanup:
	alpm_list_free(unresolvable);
	alpm_list_free(remove);

	return ret;
}

/** Returns the size of the files that will be downloaded to install a
 * package.
 * @param newpkg the new package to upgrade to
 * @return the size of the download
 */
off_t SYMEXPORT alpm_pkg_download_size(alpm_pkg_t *newpkg)
{
	if(!(newpkg->infolevel & INFRQ_DSIZE)) {
		compute_download_size(newpkg);
	}
	return newpkg->download_size;
}

static int endswith(const char *filename, const char *extension)
{
	const char *s = filename + strlen(filename) - strlen(extension);
	return strcmp(s, extension) == 0;
}

/** Applies delta files to create an upgraded package file.
 *
 * All intermediate files are deleted, leaving only the starting and
 * ending package files.
 *
 * @param handle the context handle
 *
 * @return 0 if all delta files were able to be applied, 1 otherwise.
 */
static int apply_deltas(alpm_handle_t *handle)
{
	alpm_list_t *i;
	int ret = 0;
	const char *cachedir = _alpm_filecache_setup(handle);
	alpm_trans_t *trans = handle->trans;

	for(i = trans->add; i; i = i->next) {
		alpm_pkg_t *spkg = i->data;
		alpm_list_t *delta_path = spkg->delta_path;
		alpm_list_t *dlts = NULL;

		if(!delta_path) {
			continue;
		}

		for(dlts = delta_path; dlts; dlts = dlts->next) {
			alpm_delta_t *d = dlts->data;
			char *delta, *from, *to;
			char command[PATH_MAX];
			size_t len = 0;

			delta = _alpm_filecache_find(handle, d->delta);
			/* the initial package might be in a different cachedir */
			if(dlts == delta_path) {
				from = _alpm_filecache_find(handle, d->from);
			} else {
				/* len = cachedir len + from len + '/' + null */
				len = strlen(cachedir) + strlen(d->from) + 2;
				CALLOC(from, len, sizeof(char), RET_ERR(handle, PM_ERR_MEMORY, 1));
				snprintf(from, len, "%s/%s", cachedir, d->from);
			}
			len = strlen(cachedir) + strlen(d->to) + 2;
			CALLOC(to, len, sizeof(char), RET_ERR(handle, PM_ERR_MEMORY, 1));
			snprintf(to, len, "%s/%s", cachedir, d->to);

			/* build the patch command */
			if(endswith(to, ".gz")) {
				/* special handling for gzip : we disable timestamp with -n option */
				snprintf(command, PATH_MAX, "xdelta3 -d -q -R -c -s %s %s | gzip -n > %s", from, delta, to);
			} else {
				snprintf(command, PATH_MAX, "xdelta3 -d -q -s %s %s %s", from, delta, to);
			}

			_alpm_log(handle, ALPM_LOG_DEBUG, "command: %s\n", command);

			EVENT(trans, ALPM_TRANS_EVT_DELTA_PATCH_START, d->to, d->delta);

			int retval = system(command);
			if(retval == 0) {
				EVENT(trans, ALPM_TRANS_EVT_DELTA_PATCH_DONE, NULL, NULL);

				/* delete the delta file */
				unlink(delta);

				/* Delete the 'from' package but only if it is an intermediate
				 * package. The starting 'from' package should be kept, just
				 * as if deltas were not used. */
				if(dlts != delta_path) {
					unlink(from);
				}
			}
			FREE(from);
			FREE(to);
			FREE(delta);

			if(retval != 0) {
				/* one delta failed for this package, cancel the remaining ones */
				EVENT(trans, ALPM_TRANS_EVT_DELTA_PATCH_FAILED, NULL, NULL);
				handle->pm_errno = PM_ERR_DLT_PATCHFAILED;
				ret = 1;
				break;
			}
		}
	}

	return ret;
}

/** Compares the md5sum of a file to the expected value.
 *
 * If the md5sum does not match, the user is asked whether the file
 * should be deleted.
 *
 * @param trans the transaction
 * @param filename the absolute path of the file to test
 * @param md5sum the expected md5sum of the file
 *
 * @return 0 if the md5sum matched, 1 if not, -1 in case of errors
 */
static int test_md5sum(alpm_trans_t *trans, const char *filepath,
		const char *md5sum)
{
	int ret = _alpm_test_md5sum(filepath, md5sum);
	if(ret == 1) {
		int doremove = 0;
		QUESTION(trans, ALPM_TRANS_CONV_CORRUPTED_PKG, (char *)filepath,
				NULL, NULL, &doremove);
		if(doremove) {
			unlink(filepath);
		}
	}

	return ret;
}

static int validate_deltas(alpm_handle_t *handle, alpm_list_t *deltas,
		alpm_list_t **data)
{
	int errors = 0, ret = 0;
	alpm_list_t *i;
	alpm_trans_t *trans = handle->trans;

	if(!deltas) {
		return 0;
	}

	/* Check integrity of deltas */
	EVENT(trans, ALPM_TRANS_EVT_DELTA_INTEGRITY_START, NULL, NULL);

	for(i = deltas; i; i = i->next) {
		alpm_delta_t *d = alpm_list_getdata(i);
		char *filepath = _alpm_filecache_find(handle, d->delta);

		if(test_md5sum(trans, filepath, d->delta_md5) != 0) {
			errors++;
			*data = alpm_list_add(*data, strdup(d->delta));
		}
		FREE(filepath);
	}
	if(errors) {
		handle->pm_errno = PM_ERR_DLT_INVALID;
		return -1;
	}
	EVENT(trans, ALPM_TRANS_EVT_DELTA_INTEGRITY_DONE, NULL, NULL);

	/* Use the deltas to generate the packages */
	EVENT(trans, ALPM_TRANS_EVT_DELTA_PATCHES_START, NULL, NULL);
	ret = apply_deltas(handle);
	EVENT(trans, ALPM_TRANS_EVT_DELTA_PATCHES_DONE, NULL, NULL);
	return ret;
}

static int download_files(alpm_handle_t *handle, alpm_list_t **deltas)
{
	const char *cachedir;
	alpm_list_t *i, *j;
	alpm_list_t *files = NULL;
	int errors = 0;

	cachedir = _alpm_filecache_setup(handle);
	handle->trans->state = STATE_DOWNLOADING;

	/* Total progress - figure out the total download size if required to
	 * pass to the callback. This function is called once, and it is up to the
	 * frontend to compute incremental progress. */
	if(handle->totaldlcb) {
		off_t total_size = (off_t)0;
		/* sum up the download size for each package and store total */
		for(i = handle->trans->add; i; i = i->next) {
			alpm_pkg_t *spkg = i->data;
			total_size += spkg->download_size;
		}
		handle->totaldlcb(total_size);
	}

	/* group sync records by repository and download */
	for(i = handle->dbs_sync; i; i = i->next) {
		alpm_db_t *current = i->data;

		for(j = handle->trans->add; j; j = j->next) {
			alpm_pkg_t *spkg = j->data;

			if(spkg->origin != PKG_FROM_FILE && current == spkg->origin_data.db) {
				const char *fname = NULL;

				fname = alpm_pkg_get_filename(spkg);
				ASSERT(fname != NULL, RET_ERR(handle, PM_ERR_PKG_INVALID_NAME, -1));
				alpm_list_t *delta_path = spkg->delta_path;
				if(delta_path) {
					/* using deltas */
					alpm_list_t *dlts;
					for(dlts = delta_path; dlts; dlts = dlts->next) {
						alpm_delta_t *delta = dlts->data;
						if(delta->download_size != 0) {
							files = alpm_list_add(files, strdup(delta->delta));
						}
						/* keep a list of all the delta files for md5sums */
						*deltas = alpm_list_add(*deltas, delta);
					}

				} else if(spkg->download_size != 0) {
					files = alpm_list_add(files, strdup(fname));
				}

			}
		}

		if(files) {
			EVENT(handle->trans, ALPM_TRANS_EVT_RETRIEVE_START, current->treename, NULL);
			for(j = files; j; j = j->next) {
				const char *filename = j->data;
				alpm_list_t *server;
				int ret = -1;
				for(server = current->servers; server; server = server->next) {
					const char *server_url = server->data;
					char *fileurl;
					size_t len;

					/* print server + filename into a buffer */
					len = strlen(server_url) + strlen(filename) + 2;
					CALLOC(fileurl, len, sizeof(char), RET_ERR(handle, PM_ERR_MEMORY, -1));
					snprintf(fileurl, len, "%s/%s", server_url, filename);

					ret = _alpm_download(handle, fileurl, cachedir, 0, 1, 0);
					FREE(fileurl);
					if(ret != -1) {
						break;
					}
				}
				if(ret == -1) {
					errors++;
				}
			}

			FREELIST(files);
			if(errors) {
				_alpm_log(handle, ALPM_LOG_WARNING, _("failed to retrieve some files from %s\n"),
						current->treename);
				if(handle->pm_errno == 0) {
					handle->pm_errno = PM_ERR_RETRIEVE;
				}
				return -1;
			}
		}
	}

	for(j = handle->trans->add; j; j = j->next) {
		alpm_pkg_t *pkg = j->data;
		pkg->infolevel &= ~INFRQ_DSIZE;
		pkg->download_size = 0;
	}

	/* clear out value to let callback know we are done */
	if(handle->totaldlcb) {
		handle->totaldlcb(0);
	}
	return 0;
}

int _alpm_sync_commit(alpm_handle_t *handle, alpm_list_t **data)
{
	alpm_list_t *i;
	alpm_list_t *deltas = NULL;
	size_t numtargs, current = 0, replaces = 0;
	int errors;
	alpm_trans_t *trans = handle->trans;

	if(download_files(handle, &deltas)) {
		alpm_list_free(deltas);
		return -1;
	}

	if(validate_deltas(handle, deltas, data)) {
		alpm_list_free(deltas);
		return -1;
	}
	alpm_list_free(deltas);

	/* Check integrity of packages */
	numtargs = alpm_list_count(trans->add);
	EVENT(trans, ALPM_TRANS_EVT_INTEGRITY_START, NULL, NULL);

	errors = 0;

	for(i = trans->add; i; i = i->next, current++) {
		alpm_pkg_t *spkg = i->data;
		int percent = (current * 100) / numtargs;
		const char *filename;
		char *filepath;
		pgp_verify_t check_sig;

		PROGRESS(trans, PM_TRANS_PROGRESS_INTEGRITY_START, "", percent,
				numtargs, current);
		if(spkg->origin == PKG_FROM_FILE) {
			continue; /* pkg_load() has been already called, this package is valid */
		}

		filename = alpm_pkg_get_filename(spkg);
		filepath = _alpm_filecache_find(handle, filename);
		alpm_db_t *sdb = alpm_pkg_get_db(spkg);
		check_sig = alpm_db_get_sigverify_level(sdb);

		/* load the package file and replace pkgcache entry with it in the target list */
		/* TODO: alpm_pkg_get_db() will not work on this target anymore */
		_alpm_log(handle, ALPM_LOG_DEBUG,
				"replacing pkgcache entry with package file for target %s\n",
				spkg->name);
		alpm_pkg_t *pkgfile =_alpm_pkg_load_internal(handle, filepath, 1, spkg->md5sum,
				spkg->base64_sig, check_sig);
		if(!pkgfile) {
			errors++;
			*data = alpm_list_add(*data, strdup(filename));
			FREE(filepath);
			continue;
		}
		FREE(filepath);
		pkgfile->reason = spkg->reason; /* copy over install reason */
		i->data = pkgfile;
		_alpm_pkg_free_trans(spkg); /* spkg has been removed from the target list */
	}

	PROGRESS(trans, PM_TRANS_PROGRESS_INTEGRITY_START, "", 100,
			numtargs, current);
	EVENT(trans, ALPM_TRANS_EVT_INTEGRITY_DONE, NULL, NULL);


	if(errors) {
		RET_ERR(handle, PM_ERR_PKG_INVALID, -1);
	}

	if(trans->flags & ALPM_TRANS_FLAG_DOWNLOADONLY) {
		return 0;
	}

	trans->state = STATE_COMMITING;

	replaces = alpm_list_count(trans->remove);

	/* fileconflict check */
	if(!(trans->flags & ALPM_TRANS_FLAG_FORCE)) {
		EVENT(trans, ALPM_TRANS_EVT_FILECONFLICTS_START, NULL, NULL);

		_alpm_log(handle, ALPM_LOG_DEBUG, "looking for file conflicts\n");
		alpm_list_t *conflict = _alpm_db_find_fileconflicts(handle,
				trans->add, trans->remove);
		if(conflict) {
			if(data) {
				*data = conflict;
			} else {
				alpm_list_free_inner(conflict, (alpm_list_fn_free)_alpm_fileconflict_free);
				alpm_list_free(conflict);
			}
			RET_ERR(handle, PM_ERR_FILE_CONFLICTS, -1);
		}

		EVENT(trans, ALPM_TRANS_EVT_FILECONFLICTS_DONE, NULL, NULL);
	}

	/* check available disk space */
	if(handle->checkspace) {
		EVENT(trans, ALPM_TRANS_EVT_DISKSPACE_START, NULL, NULL);

		_alpm_log(handle, ALPM_LOG_DEBUG, "checking available disk space\n");
		if(_alpm_check_diskspace(handle) == -1) {
			_alpm_log(handle, ALPM_LOG_ERROR, "%s\n", _("not enough free disk space"));
			return -1;
		}

		EVENT(trans, ALPM_TRANS_EVT_DISKSPACE_DONE, NULL, NULL);
	}

	/* remove conflicting and to-be-replaced packages */
	if(replaces) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "removing conflicting and to-be-replaced packages\n");
		/* we want the frontend to be aware of commit details */
		if(_alpm_remove_packages(handle) == -1) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("could not commit removal transaction\n"));
			return -1;
		}
	}

	/* install targets */
	_alpm_log(handle, ALPM_LOG_DEBUG, "installing packages\n");
	if(_alpm_upgrade_packages(handle) == -1) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("could not commit transaction\n"));
		return -1;
	}

	return 0;
}

/* vim: set ts=2 sw=2 noet: */