summaryrefslogtreecommitdiff
path: root/lib/libalpm/sync.c
blob: 3743f9bb65f061ca08700f9c588964b4bb593056 (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
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
/*
 *  sync.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 <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <dirent.h>

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

pmsyncpkg_t *_alpm_sync_new(pmpkgreason_t newreason, pmpkg_t *spkg, alpm_list_t *removes)
{
	pmsyncpkg_t *sync;

	ALPM_LOG_FUNC;

	CALLOC(sync, 1, sizeof(pmsyncpkg_t), RET_ERR(PM_ERR_MEMORY, NULL));

	sync->newreason = newreason;
	sync->pkg = spkg;
	sync->removes = removes;

	return(sync);
}

void _alpm_sync_free(pmsyncpkg_t *sync)
{
	ALPM_LOG_FUNC;

	if(sync == NULL) {
		return;
	}

	alpm_list_free(sync->removes);
	sync->removes = NULL;
	FREE(sync);
}

/* Find recommended replacements for packages during a sync.
 */
static int find_replacements(pmtrans_t *trans, pmdb_t *db_local,
		alpm_list_t *dbs_sync, alpm_list_t **syncpkgs)
{
	alpm_list_t *i, *j, *k; /* wow */

	ALPM_LOG_FUNC;

	if(syncpkgs == NULL) {
		return(-1);
	}

	/* check for "recommended" package replacements */
	_alpm_log(PM_LOG_DEBUG, "checking for package replacements\n");
	for(i = dbs_sync; i; i = i->next) {
		pmdb_t *db = i->data;

		/* for each db, check each package's REPLACES list */
		for(j = _alpm_db_get_pkgcache(db); j; j = j->next) {
			pmpkg_t *spkg = j->data;

			for(k = alpm_pkg_get_replaces(spkg); k; k = k->next) {
				const char *replacement = k->data;

				pmpkg_t *lpkg = _alpm_db_get_pkgfromcache(db_local, replacement);
				if(!lpkg) {
					continue;
				}

				_alpm_log(PM_LOG_DEBUG, "checking replacement '%s' for package '%s'\n",
						replacement, spkg->name);
				/* ignore if EITHER the local or replacement package are to be ignored */
				if(_alpm_pkg_should_ignore(spkg) || _alpm_pkg_should_ignore(lpkg)) {
					_alpm_log(PM_LOG_WARNING, _("%s-%s: ignoring package upgrade (to be replaced by %s-%s)\n"),
										alpm_pkg_get_name(lpkg), alpm_pkg_get_version(lpkg),
										alpm_pkg_get_name(spkg), alpm_pkg_get_version(spkg));
				} else {
					/* get confirmation for the replacement */
					if(trans) {
						int doreplace = 0;
						QUESTION(trans, PM_TRANS_CONV_REPLACE_PKG, lpkg, spkg, db->treename, &doreplace);
						if(!doreplace) {
							continue;
						}
					}

					/* if confirmed, add this to the 'final' list, designating 'lpkg' as
					 * the package to replace.
					 */
					pmsyncpkg_t *sync;

					/* check if spkg->name is already in the packages list. */
					/* TODO: same package name doesn't mean same package */
					sync = _alpm_sync_find(*syncpkgs, alpm_pkg_get_name(spkg));
					if(sync) {
						/* found it -- just append to the removes list */
						sync->removes = alpm_list_add(sync->removes, lpkg);
						/* check the to-be-replaced package's reason field */
						if(lpkg->reason == PM_PKG_REASON_EXPLICIT) {
							sync->newreason = PM_PKG_REASON_EXPLICIT;
						}
					} else {
						/* none found -- enter pkg into the final sync list */
						/* copy over reason */
						sync = _alpm_sync_new(alpm_pkg_get_reason(lpkg), spkg, NULL);
						if(sync == NULL) {
							pm_errno = PM_ERR_MEMORY;
							alpm_list_free_inner(*syncpkgs, (alpm_list_fn_free)_alpm_sync_free);
							alpm_list_free(*syncpkgs);
							*syncpkgs = NULL;
							return(-1);
						}
						sync->removes = alpm_list_add(NULL, lpkg);
						*syncpkgs = alpm_list_add(*syncpkgs, sync);
					}
					_alpm_log(PM_LOG_DEBUG, "%s-%s elected for removal (to be replaced by %s-%s)\n",
							alpm_pkg_get_name(lpkg), alpm_pkg_get_version(lpkg),
							alpm_pkg_get_name(spkg), alpm_pkg_get_version(spkg));
				}
			}
		}
	}
	return(0);
}

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

	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(PM_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(pkg, spkg)) {
		_alpm_log(PM_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);
	} else {
		return(NULL);
	}
}

/** Get a list of upgradable packages on the current system
 * Adds out of date packages to *list.
 * @arg list pointer to a list of pmsyncpkg_t.
 */
int SYMEXPORT alpm_sync_sysupgrade(pmdb_t *db_local,
		alpm_list_t *dbs_sync, alpm_list_t **syncpkgs)
{
	return(_alpm_sync_sysupgrade(NULL, db_local, dbs_sync, syncpkgs));
}

int _alpm_sync_sysupgrade(pmtrans_t *trans,
		pmdb_t *db_local, alpm_list_t *dbs_sync, alpm_list_t **syncpkgs)
{
	alpm_list_t *i, *j, *replaced = NULL;

	ALPM_LOG_FUNC;

	if(syncpkgs == NULL) {
		return(-1);
	}
	/* check for "recommended" package replacements */
	if(find_replacements(trans, db_local, dbs_sync, syncpkgs)) {
		return(-1);
	}

	/* compute the to-be-replaced packages for efficiency */
	for(i = *syncpkgs; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		for(j = sync->removes; j; j = j->next) {
			replaced = alpm_list_add(replaced, j->data);
		}
	}

	/* for all not-replaced local package we check for upgrade */
	_alpm_log(PM_LOG_DEBUG, "checking for package upgrades\n");
	for(i = _alpm_db_get_pkgcache(db_local); i; i = i->next) {
		pmpkg_t *local = i->data;

		if(_alpm_pkg_find(replaced, alpm_pkg_get_name(local))) {
			_alpm_log(PM_LOG_DEBUG, "'%s' is already elected for removal -- skipping\n",
					alpm_pkg_get_name(local));
			continue;
		}

		pmpkg_t *spkg = alpm_sync_newversion(local, dbs_sync);
		if(spkg) {
			/* we found a new version */
			/* skip packages in IgnorePkg or in IgnoreGroup */
			if(_alpm_pkg_should_ignore(spkg)) {
				_alpm_log(PM_LOG_WARNING, _("%s: ignoring package upgrade (%s => %s)\n"),
						alpm_pkg_get_name(local), alpm_pkg_get_version(local),
						alpm_pkg_get_version(spkg));
				continue;
			}

			/* add the upgrade package to our pmsyncpkg_t list */
			if(_alpm_sync_find(*syncpkgs, alpm_pkg_get_name(spkg))) {
				/* avoid duplicated targets */
				continue;
			}
			/* we can set any reason here, it will be overridden by add_commit */
			pmsyncpkg_t *sync = _alpm_sync_new(PM_PKG_REASON_EXPLICIT, spkg, NULL);
			if(sync == NULL) {
				alpm_list_free_inner(*syncpkgs, (alpm_list_fn_free)_alpm_sync_free);
				alpm_list_free(*syncpkgs);
				*syncpkgs = NULL;
				alpm_list_free(replaced);
				return(-1);
			}
			*syncpkgs = alpm_list_add(*syncpkgs, sync);
		}
	}

	alpm_list_free(replaced);
	return(0);
}

int _alpm_sync_addtarget(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync, char *name)
{
	char *targline;
	char *targ;
	alpm_list_t *j;
	pmpkg_t *local;
	pmpkg_t *spkg = NULL;
	pmsyncpkg_t *sync;
	int repo_found = 0;

	ALPM_LOG_FUNC;

	ASSERT(db_local != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(name != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
	STRDUP(targline, name, RET_ERR(PM_ERR_MEMORY, -1));

	targ = strchr(targline, '/');
	if(targ) {
		/* we are looking for a package in a specific database */
		*targ = '\0';
		targ++;
		_alpm_log(PM_LOG_DEBUG, "searching for target '%s' in repo\n", targ);
		for(j = dbs_sync; j && !spkg; j = j->next) {
			pmdb_t *db = j->data;
			if(strcmp(db->treename, targline) == 0) {
				repo_found = 1;
				spkg = _alpm_db_get_pkgfromcache(db, targ);
				if(spkg == NULL) {
					pm_errno = PM_ERR_PKG_NOT_FOUND;
					goto error;
				}
			}
		}
		if(!repo_found) {
			_alpm_log(PM_LOG_ERROR, _("repository '%s' not found\n"), targline);
			pm_errno = PM_ERR_PKG_REPO_NOT_FOUND;
			goto error;
		}
	} else {
		targ = targline;
		for(j = dbs_sync; j && !spkg; j = j->next) {
			pmdb_t *db = j->data;
			spkg = _alpm_db_get_pkgfromcache(db, targ);
		}
		if(spkg == NULL) {
			pm_errno = PM_ERR_PKG_NOT_FOUND;
			goto error;
		}
	}

	if(_alpm_sync_find(trans->packages, alpm_pkg_get_name(spkg))) {
		FREE(targline);
		RET_ERR(PM_ERR_TRANS_DUP_TARGET, -1);
	}

	if(_alpm_pkg_should_ignore(spkg)) {
		int resp;
		QUESTION(trans, PM_TRANS_CONV_INSTALL_IGNOREPKG, spkg, NULL, NULL, &resp);
		if (!resp) {
			return(0);
		}
	}

	local = _alpm_db_get_pkgfromcache(db_local, alpm_pkg_get_name(spkg));
	if(local) {
		if(_alpm_pkg_compare_versions(local, spkg) == 0) {
			/* spkg is NOT an upgrade */
			if(trans->flags & PM_TRANS_FLAG_NEEDED) {
				_alpm_log(PM_LOG_WARNING, _("%s-%s is up to date -- skipping\n"),
						alpm_pkg_get_name(local), alpm_pkg_get_version(local));
				return(0);
			} else {
				if(!(trans->flags & PM_TRANS_FLAG_DOWNLOADONLY)) {
					_alpm_log(PM_LOG_WARNING, _("%s-%s is up to date -- reinstalling\n"),
							alpm_pkg_get_name(local), alpm_pkg_get_version(local));
				}
			}
		}
	}

	/* add the package to the transaction */
	sync = _alpm_sync_new(PM_PKG_REASON_EXPLICIT, spkg, NULL);
	if(sync == NULL) {
		goto error;
	}
	_alpm_log(PM_LOG_DEBUG, "adding target '%s' to the transaction set\n",
						alpm_pkg_get_name(spkg));
	trans->packages = alpm_list_add(trans->packages, sync);

	FREE(targline);
	return(0);

error:
	if(targline) {
		FREE(targline);
	}
	return(-1);
}

/* Helper functions for alpm_list_remove
*/
static int syncpkg_cmp(const void *s1, const void *s2)
{
	const pmsyncpkg_t *sp1 = s1;
	const pmsyncpkg_t *sp2 = s2;
	pmpkg_t *p1, *p2;

	p1 = alpm_sync_get_pkg(sp1);
	p2 = alpm_sync_get_pkg(sp2);

	return(strcmp(alpm_pkg_get_name(p1), alpm_pkg_get_name(p2)));
}

/** 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(pmpkg_t *newpkg)
{
	const char *fname;
	char *fpath;
	unsigned long size = 0;

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

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

		dltsize = _alpm_shortest_delta_path(
			alpm_pkg_get_deltas(newpkg),
			alpm_pkg_get_filename(newpkg),
			alpm_pkg_get_md5sum(newpkg),
			&newpkg->delta_path);

		if(newpkg->delta_path && (dltsize < pkgsize * MAX_DELTA_RATIO)) {
			_alpm_log(PM_LOG_DEBUG, "using delta size\n");
			size = dltsize;
		} else {
			_alpm_log(PM_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(PM_LOG_DEBUG, "setting download size %ld for pkg %s\n", size,
			alpm_pkg_get_name(newpkg));

	newpkg->download_size = size;
	return(0);
}

int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync, alpm_list_t **data)
{
	alpm_list_t *deps = NULL;
	alpm_list_t *list = NULL, *remove = NULL; /* allow checkdeps usage with trans->packages */
	alpm_list_t *i, *j;
	int ret = 0;

	ALPM_LOG_FUNC;

	ASSERT(db_local != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));

	if(data) {
		*data = NULL;
	}

	for(i = trans->packages; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		list = alpm_list_add(list, sync->pkg);
	}

	if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
		/* store a pointer to the last original target so we can tell what was
		 * pulled by resolvedeps */
		alpm_list_t *pulled = alpm_list_last(list);
		/* Resolve targets dependencies */
		EVENT(trans, PM_TRANS_EVT_RESOLVEDEPS_START, NULL, NULL);
		_alpm_log(PM_LOG_DEBUG, "resolving target's dependencies\n");

		/* build remove list for resolvedeps */
		for(i = trans->packages; i; i = i->next) {
			pmsyncpkg_t *sync = i->data;
			for(j = sync->removes; j; j = j->next) {
				remove = alpm_list_add(remove, j->data);
			}
		}

		for(i = trans->packages; i; i = i->next) {
			pmpkg_t *spkg = ((pmsyncpkg_t *)i->data)->pkg;
			if(_alpm_resolvedeps(db_local, dbs_sync, spkg, &list,
						remove, trans, data) == -1) {
				/* pm_errno is set by resolvedeps */
				ret = -1;
				goto cleanup;
			}
		}

		for(i = pulled->next; i; i = i->next) {
			pmpkg_t *spkg = i->data;
			pmsyncpkg_t *sync = _alpm_sync_new(PM_PKG_REASON_DEPEND, spkg, NULL);
			if(sync == NULL) {
				ret = -1;
				goto cleanup;
			}
			trans->packages = alpm_list_add(trans->packages, sync);
			_alpm_log(PM_LOG_DEBUG, "adding package %s-%s to the transaction targets\n",
								alpm_pkg_get_name(spkg), alpm_pkg_get_version(spkg));
		}

		/* re-order w.r.t. dependencies */
		alpm_list_t *sortlist = _alpm_sortbydeps(list, 0);
		alpm_list_t *newpkgs = NULL;
		for(i = sortlist; i; i = i->next) {
			for(j = trans->packages; j; j = j->next) {
				pmsyncpkg_t *s = j->data;
				if(s->pkg == i->data) {
					newpkgs = alpm_list_add(newpkgs, s);
					break;
				}
			}
		}
		alpm_list_free(sortlist);
		alpm_list_free(trans->packages);
		trans->packages = newpkgs;

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

	/* We don't care about conflicts if we're just printing uris */
	if(!(trans->flags & (PM_TRANS_FLAG_NOCONFLICTS | PM_TRANS_FLAG_PRINTURIS))) {
		/* check for inter-conflicts and whatnot */
		EVENT(trans, PM_TRANS_EVT_INTERCONFLICTS_START, NULL, NULL);

		_alpm_log(PM_LOG_DEBUG, "looking for conflicts\n");

		/* 1. check for conflicts in the target list */
		_alpm_log(PM_LOG_DEBUG, "check targets vs targets\n");
		deps = _alpm_innerconflicts(list);

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

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

			_alpm_log(PM_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 */
			if(alpm_list_find(alpm_pkg_get_provides(sync1->pkg),
						conflict->package2, _alpm_prov_cmp)) {
				rsync = sync2;
				sync = sync1;
			} else if(alpm_list_find(alpm_pkg_get_provides(sync2->pkg),
						conflict->package1, _alpm_prov_cmp)) {
				rsync = sync1;
				sync = sync2;
			} else {
				_alpm_log(PM_LOG_ERROR, _("unresolvable package conflicts detected\n"));
				pm_errno = PM_ERR_CONFLICTING_DEPS;
				ret = -1;
				if(data) {
					pmconflict_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;
			}

			/* Prints warning */
			_alpm_log(PM_LOG_WARNING,
					_("removing '%s' from target list because it conflicts with '%s'\n"),
					rsync->pkg->name, sync->pkg->name);
			void *vpkg;
			trans->packages = alpm_list_remove(trans->packages, rsync,
					syncpkg_cmp, &vpkg);
			pmsyncpkg_t *syncpkg = vpkg;
			list = alpm_list_remove(list, syncpkg->pkg, _alpm_pkg_cmp, NULL);
			_alpm_sync_free(syncpkg);
			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(PM_LOG_DEBUG, "check targets vs db and db vs targets\n");
		deps = _alpm_outerconflicts(db_local, list);

		for(i = deps; i; i = i->next) {
			pmconflict_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->packages; j && !found; j = j->next) {
				pmsyncpkg_t *sync = j->data;
				if(_alpm_pkg_find(sync->removes, conflict->package2)) {
					found = 1;
				}
			}
			if(found) {
				continue;
			}

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

			pmsyncpkg_t *sync = _alpm_sync_find(trans->packages, conflict->package1);
			pmpkg_t *local = _alpm_db_get_pkgfromcache(db_local, conflict->package2);
			int doremove = 0;
			QUESTION(trans, PM_TRANS_CONV_CONFLICT_PKG, conflict->package1,
								conflict->package2, NULL, &doremove);
			if(doremove) {
				/* append to the removes list */
				_alpm_log(PM_LOG_DEBUG, "electing '%s' for removal\n", conflict->package2);
				sync->removes = alpm_list_add(sync->removes, local);
			} else { /* abort */
				_alpm_log(PM_LOG_ERROR, _("unresolvable package conflicts detected\n"));
				pm_errno = PM_ERR_CONFLICTING_DEPS;
				ret = -1;
				if(data) {
					pmconflict_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, PM_TRANS_EVT_INTERCONFLICTS_DONE, NULL, NULL);
		alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
		alpm_list_free(deps);
	}

	if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
		/* rebuild remove list */
		alpm_list_free(remove);
		remove = NULL;
		for(i = trans->packages; i; i = i->next) {
			pmsyncpkg_t *sync = i->data;
			for(j = sync->removes; j; j = j->next) {
				remove = alpm_list_add(remove, j->data);
			}
		}

		_alpm_log(PM_LOG_DEBUG, "checking dependencies\n");
		deps = alpm_checkdeps(db_local, 1, remove, list);
		if(deps) {
			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 = list; i; i = i->next) {
		/* update download size field */
		pmpkg_t *spkg = i->data;
		if(compute_download_size(spkg) != 0) {
			ret = -1;
			goto cleanup;
		}
	}

cleanup:
	alpm_list_free(list);
	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
 */
unsigned long SYMEXPORT alpm_pkg_download_size(pmpkg_t *newpkg)
{
	return(newpkg->download_size);
}

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

	for(i = trans->packages; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		pmpkg_t *spkg = sync->pkg;
		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) {
			pmdelta_t *d = dlts->data;
			char *delta, *from, *to;
			char command[PATH_MAX];
			int len = 0;

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

			/* an example of the patch command: (using /cache for cachedir)
			 * xdelta patch /path/to/pacman_3.0.0-1_to_3.0.1-1-i686.delta \
			 *              /path/to/pacman-3.0.0-1-i686.pkg.tar.gz       \
			 *              /cache/pacman-3.0.1-1-i686.pkg.tar.gz
			 */

			/* build the patch command */
			snprintf(command, PATH_MAX, "xdelta patch %s %s %s", delta, from, to);

			_alpm_log(PM_LOG_DEBUG, _("command: %s\n"), command);

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

			int retval = system(command);
			if(retval == 0) {
				EVENT(trans, PM_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, PM_TRANS_EVT_DELTA_PATCH_FAILED, NULL, NULL);
				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 filename 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(pmtrans_t *trans, const char *filename,
		const char *md5sum)
{
	char *filepath;
	int ret;

	filepath = _alpm_filecache_find(filename);

	ret = _alpm_test_md5sum(filepath, md5sum);

	if(ret == 1) {
		int doremove = 0;
		QUESTION(trans, PM_TRANS_CONV_CORRUPTED_PKG, (char *)filename,
				NULL, NULL, &doremove);
		if(doremove) {
			unlink(filepath);
		}
	}

	FREE(filepath);

	return(ret);
}

int _alpm_sync_commit(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t **data)
{
	alpm_list_t *i, *j, *files = NULL;
	alpm_list_t *deltas = NULL;
	pmtrans_t *tr = NULL;
	int replaces = 0;
	int errors = 0;
	const char *cachedir = NULL;
	int ret = -1;

	ALPM_LOG_FUNC;

	ASSERT(db_local != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));

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

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

		for(j = trans->packages; j; j = j->next) {
			pmsyncpkg_t *sync = j->data;
			pmpkg_t *spkg = sync->pkg;
			pmdb_t *dbs = spkg->origin_data.db;

			if(current == dbs) {
				const char *fname = NULL;

				fname = alpm_pkg_get_filename(spkg);
				ASSERT(fname != NULL, RET_ERR(PM_ERR_PKG_INVALID_NAME, -1));
				if(trans->flags & PM_TRANS_FLAG_PRINTURIS) {
					EVENT(trans, PM_TRANS_EVT_PRINTURI, (char *)alpm_db_get_url(current),
							(char *)fname);
				} else {
					if(spkg->download_size != 0) {
						alpm_list_t *delta_path = spkg->delta_path;
						if(delta_path) {
							alpm_list_t *dlts = NULL;

							for(dlts = delta_path; dlts; dlts = dlts->next) {
								pmdelta_t *d = dlts->data;

								if(d->download_size != 0) {
									/* add the delta filename to the download list if
									 * it's not in the cache */
									files = alpm_list_add(files, strdup(d->delta));
								}

								/* keep a list of the delta files for md5sums */
								deltas = alpm_list_add(deltas, d);
							}

						} else {
							/* not using deltas, so add the file to the download list */
							files = alpm_list_add(files, strdup(fname));
						}
					}
				}
			}
		}

		if(files) {
			EVENT(trans, PM_TRANS_EVT_RETRIEVE_START, current->treename, NULL);
			if(_alpm_download_files(files, current->servers, cachedir)) {
				_alpm_log(PM_LOG_WARNING, _("failed to retrieve some files from %s\n"),
						current->treename);
				pm_errno = PM_ERR_RETRIEVE;
				goto error;
			}
			FREELIST(files);
		}
	}
	if(trans->flags & PM_TRANS_FLAG_PRINTURIS) {
		return(0);
	}

	if(handle->usedelta) {
		int ret = 0;

		/* only output if there are deltas to work with */
		if(deltas) {
			errors = 0;
			/* Check integrity of deltas */
			EVENT(trans, PM_TRANS_EVT_DELTA_INTEGRITY_START, NULL, NULL);

			for(i = deltas; i; i = i->next) {
				pmdelta_t *d = alpm_list_getdata(i);
				const char *filename = alpm_delta_get_filename(d);
				const char *md5sum = alpm_delta_get_md5sum(d);

				if(test_md5sum(trans, filename, md5sum) != 0) {
					errors++;
					*data = alpm_list_add(*data, strdup(filename));
				}
			}
			if(errors) {
				pm_errno = PM_ERR_DLT_INVALID;
				goto error;
			}
			EVENT(trans, PM_TRANS_EVT_DELTA_INTEGRITY_DONE, NULL, NULL);

			/* Use the deltas to generate the packages */
			EVENT(trans, PM_TRANS_EVT_DELTA_PATCHES_START, NULL, NULL);
			ret = apply_deltas(trans);
			EVENT(trans, PM_TRANS_EVT_DELTA_PATCHES_DONE, NULL, NULL);

		}
		if(ret) {
			pm_errno = PM_ERR_DLT_PATCHFAILED;
			goto error;
		}
	}

	/* Check integrity of packages */
	EVENT(trans, PM_TRANS_EVT_INTEGRITY_START, NULL, NULL);

	errors = 0;
	for(i = trans->packages; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		pmpkg_t *spkg = sync->pkg;
		const char *filename = alpm_pkg_get_filename(spkg);
		const char *md5sum = alpm_pkg_get_md5sum(spkg);

		if(test_md5sum(trans, filename, md5sum) != 0) {
			errors++;
			*data = alpm_list_add(*data, strdup(filename));
		}
	}
	if(errors) {
		pm_errno = PM_ERR_PKG_INVALID;
		goto error;
	}
	EVENT(trans, PM_TRANS_EVT_INTEGRITY_DONE, NULL, NULL);
	if(trans->flags & PM_TRANS_FLAG_DOWNLOADONLY) {
		return(0);
	}

	/* remove conflicting and to-be-replaced packages */
	trans->state = STATE_COMMITING;
	tr = _alpm_trans_new();
	if(tr == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not create removal transaction\n"));
		goto error;
	}

	if(_alpm_trans_init(tr, PM_TRANS_TYPE_REMOVE, PM_TRANS_FLAG_NODEPS, NULL, NULL, NULL) == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not initialize the removal transaction\n"));
		goto error;
	}

	for(i = trans->packages; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		alpm_list_t *j;
		for(j = sync->removes; j; j = j->next) {
			pmpkg_t *pkg = j->data;
			if(!_alpm_pkg_find(tr->packages, pkg->name)) {
				if(_alpm_trans_addtarget(tr, pkg->name) == -1) {
					goto error;
				}
				replaces++;
			}
		}
	}
	if(replaces) {
		_alpm_log(PM_LOG_DEBUG, "removing conflicting and to-be-replaced packages\n");
		if(_alpm_trans_prepare(tr, data) == -1) {
			_alpm_log(PM_LOG_ERROR, _("could not prepare removal transaction\n"));
			goto error;
		}
		/* we want the frontend to be aware of commit details */
		tr->cb_event = trans->cb_event;
		if(_alpm_trans_commit(tr, NULL) == -1) {
			_alpm_log(PM_LOG_ERROR, _("could not commit removal transaction\n"));
			goto error;
		}
	}
	_alpm_trans_free(tr);
	tr = NULL;

	/* install targets */
	_alpm_log(PM_LOG_DEBUG, "installing packages\n");
	tr = _alpm_trans_new();
	if(tr == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not create transaction\n"));
		goto error;
	}
	if(_alpm_trans_init(tr, PM_TRANS_TYPE_UPGRADE, trans->flags | PM_TRANS_FLAG_NODEPS, trans->cb_event, trans->cb_conv, trans->cb_progress) == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not initialize transaction\n"));
		goto error;
	}
	for(i = trans->packages; i; i = i->next) {
		pmsyncpkg_t *sync = i->data;
		pmpkg_t *spkg = sync->pkg;
		const char *fname;
		char *fpath;

		fname = alpm_pkg_get_filename(spkg);
		if(fname == NULL) {
			goto error;
		}
		/* Loop through the cache dirs until we find a matching file */
		fpath = _alpm_filecache_find(fname);

		if(_alpm_trans_addtarget(tr, fpath) == -1) {
			FREE(fpath);
			goto error;
		}
		FREE(fpath);

		/* using alpm_list_last() is ok because addtarget() adds the new target at the
		 * end of the tr->packages list */
		spkg = alpm_list_last(tr->packages)->data;
		spkg->reason = sync->newreason;
	}
	if(_alpm_trans_prepare(tr, data) == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not prepare transaction\n"));
		/* pm_errno is set by trans_prepare */
		goto error;
	}
	if(_alpm_trans_commit(tr, NULL) == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not commit transaction\n"));
		goto error;
	}
	ret = 0;

error:
	FREELIST(files);
	alpm_list_free(deltas);
	deltas = NULL;
	_alpm_trans_free(tr);
	tr = NULL;
	return(ret);
}

pmsyncpkg_t *_alpm_sync_find(alpm_list_t *syncpkgs, const char* pkgname)
{
	alpm_list_t *i;
	for(i = syncpkgs; i; i = i->next) {
		pmsyncpkg_t *syncpkg = i->data;
		if(!syncpkg) {
			continue;
		}

		pmpkg_t *pkg = alpm_sync_get_pkg(syncpkg);
		if(strcmp(alpm_pkg_get_name(pkg), pkgname) == 0) {
			_alpm_log(PM_LOG_DEBUG, "found package '%s-%s' in sync\n",
								alpm_pkg_get_name(pkg), alpm_pkg_get_version(pkg));
			return(syncpkg);
		}
	}

	_alpm_log(PM_LOG_DEBUG, "package '%s' not found in sync\n", pkgname);
	return(NULL); /* not found */
}

pmpkg_t SYMEXPORT *alpm_sync_get_pkg(const pmsyncpkg_t *sync)
{
	/* Sanity checks */
	ASSERT(sync != NULL, return(NULL));

	return sync->pkg;
}

alpm_list_t SYMEXPORT *alpm_sync_get_removes(const pmsyncpkg_t *sync)
{
	/* Sanity checks */
	ASSERT(sync != NULL, return(NULL));

	return sync->removes;
}

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