Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/lib/libalpm/package.c
blob: 742d0f59d0f844e72e9535f65054b467dc95256d (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
/*
 *  package.c
 *
 *  Copyright (c) 2006-2010 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, 2006 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 <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>

/* libarchive */
#include <archive.h>
#include <archive_entry.h>

/* libalpm */
#include "package.h"
#include "alpm_list.h"
#include "log.h"
#include "util.h"
#include "db.h"
#include "cache.h"
#include "delta.h"
#include "handle.h"
#include "deps.h"

/** \addtogroup alpm_packages Package Functions
 * @brief Functions to manipulate libalpm packages
 * @{
 */

/** Free a package.
 * @param pkg package pointer to free
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_pkg_free(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	ASSERT(pkg != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	/* Only free packages loaded in user space */
	if(pkg->origin != PKG_FROM_CACHE) {
		_alpm_pkg_free(pkg);
	}

	return(0);
}

/** Check the integrity (with md5) of a package from the sync cache.
 * @param pkg package pointer
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_pkg_checkmd5sum(pmpkg_t *pkg)
{
	char *fpath;
	int retval;

	ALPM_LOG_FUNC;

	ASSERT(pkg != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
	/* We only inspect packages from sync repositories */
	ASSERT(pkg->origin == PKG_FROM_CACHE, RET_ERR(PM_ERR_PKG_INVALID, -1));
	ASSERT(pkg->origin_data.db != handle->db_local, RET_ERR(PM_ERR_PKG_INVALID, -1));

	fpath = _alpm_filecache_find(alpm_pkg_get_filename(pkg));

	retval = _alpm_test_md5sum(fpath, alpm_pkg_get_md5sum(pkg));

	if(retval == 0) {
		return(0);
	} else if (retval == 1) {
		pm_errno = PM_ERR_PKG_INVALID;
		retval = -1;
	}

	return(retval);
}

const char SYMEXPORT *alpm_pkg_get_filename(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}

	return pkg->filename;
}

const char SYMEXPORT *alpm_pkg_get_name(pmpkg_t *pkg)
{
	ASSERT(pkg != NULL, return(NULL));
	return pkg->name;
}

const char SYMEXPORT *alpm_pkg_get_version(pmpkg_t *pkg)
{
	ASSERT(pkg != NULL, return(NULL));
	return pkg->version;
}

const char SYMEXPORT *alpm_pkg_get_desc(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->desc;
}

const char SYMEXPORT *alpm_pkg_get_url(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->url;
}

time_t SYMEXPORT alpm_pkg_get_builddate(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(0));
	ASSERT(pkg != NULL, return(0));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->builddate;
}

time_t SYMEXPORT alpm_pkg_get_installdate(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(0));
	ASSERT(pkg != NULL, return(0));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->installdate;
}

const char SYMEXPORT *alpm_pkg_get_packager(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->packager;
}

const char SYMEXPORT *alpm_pkg_get_md5sum(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->md5sum;
}

const char SYMEXPORT *alpm_pkg_get_arch(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->arch;
}

off_t SYMEXPORT alpm_pkg_get_size(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(pkg != NULL, return(-1));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->size;
}

off_t SYMEXPORT alpm_pkg_get_isize(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(pkg != NULL, return(-1));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->isize;
}

pmpkgreason_t SYMEXPORT alpm_pkg_get_reason(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(pkg != NULL, return(-1));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->reason;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_licenses(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->licenses;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_groups(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->groups;
}

int SYMEXPORT alpm_pkg_has_force(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(pkg != NULL, return(-1));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->force;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_depends(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DEPENDS)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DEPENDS);
	}
	return pkg->depends;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_optdepends(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DEPENDS)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DEPENDS);
	}
	return pkg->optdepends;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_conflicts(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DEPENDS)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DEPENDS);
	}
	return pkg->conflicts;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_provides(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DEPENDS)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DEPENDS);
	}
	return pkg->provides;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_deltas(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DELTAS)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DELTAS);
	}
	return pkg->deltas;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_replaces(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && !(pkg->infolevel & INFRQ_DESC)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_DESC);
	}
	return pkg->replaces;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_files(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && pkg->origin_data.db == handle->db_local
		 && !(pkg->infolevel & INFRQ_FILES)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_FILES);
	}
	return pkg->files;
}

alpm_list_t SYMEXPORT *alpm_pkg_get_backup(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE && pkg->origin_data.db == handle->db_local
		 && !(pkg->infolevel & INFRQ_FILES)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_FILES);
	}
	return pkg->backup;
}

pmdb_t SYMEXPORT *alpm_pkg_get_db(pmpkg_t *pkg)
{
	/* Sanity checks */
	ASSERT(pkg != NULL, return(NULL));
	ASSERT(pkg->origin == PKG_FROM_CACHE, return(NULL));

	return(pkg->origin_data.db);
}

/**
 * Open a package changelog for reading. Similar to fopen in functionality,
 * except that the returned 'file stream' could really be from an archive
 * as well as from the database.
 * @param pkg the package to read the changelog of (either file or db)
 * @return a 'file stream' to the package changelog
 */
void SYMEXPORT *alpm_pkg_changelog_open(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(pkg != NULL, return(NULL));

	if(pkg->origin == PKG_FROM_CACHE) {
		char clfile[PATH_MAX];
		snprintf(clfile, PATH_MAX, "%s/%s/%s-%s/changelog",
				alpm_option_get_dbpath(),
				alpm_db_get_name(handle->db_local),
				alpm_pkg_get_name(pkg),
				alpm_pkg_get_version(pkg));
		return fopen(clfile, "r");
	} else if(pkg->origin == PKG_FROM_FILE) {
		struct archive *archive = NULL;
		struct archive_entry *entry;
		const char *pkgfile = pkg->origin_data.file;

		if((archive = archive_read_new()) == NULL) {
			RET_ERR(PM_ERR_LIBARCHIVE, NULL);
		}

		archive_read_support_compression_all(archive);
		archive_read_support_format_all(archive);

		if (archive_read_open_filename(archive, pkgfile,
					ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
			RET_ERR(PM_ERR_PKG_OPEN, NULL);
		}

		while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
			const char *entry_name = archive_entry_pathname(entry);

			if(strcmp(entry_name, ".CHANGELOG") == 0) {
				return(archive);
			}
		}
		/* we didn't find a changelog */
		archive_read_finish(archive);
		errno = ENOENT;
	}
	return(NULL);
}

/**
 * Read data from an open changelog 'file stream'. Similar to fread in
 * functionality, this function takes a buffer and amount of data to read.
 * @param ptr a buffer to fill with raw changelog data
 * @param size the size of the buffer
 * @param pkg the package that the changelog is being read from
 * @param fp a 'file stream' to the package changelog
 * @return the number of characters read, or 0 if there is no more data
 */
size_t SYMEXPORT alpm_pkg_changelog_read(void *ptr, size_t size,
		const pmpkg_t *pkg, const void *fp)
{
	size_t ret = 0;
	if(pkg->origin == PKG_FROM_CACHE) {
		ret = fread(ptr, 1, size, (FILE*)fp);
	} else if(pkg->origin == PKG_FROM_FILE) {
		ret = archive_read_data((struct archive*)fp, ptr, size);
	}
	return(ret);
}

/*
int SYMEXPORT alpm_pkg_changelog_feof(const pmpkg_t *pkg, void *fp)
{
	int ret = 0;
	if(pkg->origin == PKG_FROM_CACHE) {
		ret = feof((FILE*)fp);
	} else if(pkg->origin == PKG_FROM_FILE) {
		// note: this doesn't quite work, no feof in libarchive
		ret = archive_read_data((struct archive*)fp, NULL, 0);
	}
	return(ret);
}
*/

/**
 * Close a package changelog for reading. Similar to fclose in functionality,
 * except that the 'file stream' could really be from an archive as well as
 * from the database.
 * @param pkg the package that the changelog was read from
 * @param fp a 'file stream' to the package changelog
 * @return whether closing the package changelog stream was successful
 */
int SYMEXPORT alpm_pkg_changelog_close(const pmpkg_t *pkg, void *fp)
{
	int ret = 0;
	if(pkg->origin == PKG_FROM_CACHE) {
		ret = fclose((FILE*)fp);
	} else if(pkg->origin == PKG_FROM_FILE) {
		ret = archive_read_finish((struct archive *)fp);
	}
	return(ret);
}

int SYMEXPORT alpm_pkg_has_scriptlet(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(-1));
	ASSERT(pkg != NULL, return(-1));

	if(pkg->origin == PKG_FROM_CACHE && pkg->origin_data.db == handle->db_local
		 && !(pkg->infolevel & INFRQ_SCRIPTLET)) {
		_alpm_db_read(pkg->origin_data.db, pkg, INFRQ_SCRIPTLET);
	}
	return pkg->scriptlet;
}

/**
 * @brief Compute the packages requiring a given package.
 * @param pkg a package
 * @return the list of packages requiring pkg
 */
alpm_list_t SYMEXPORT *alpm_pkg_compute_requiredby(pmpkg_t *pkg)
{
	const alpm_list_t *i;
	alpm_list_t *reqs = NULL;

	pmdb_t *localdb = alpm_option_get_localdb();
	for(i = _alpm_db_get_pkgcache(localdb); i; i = i->next) {
		if(!i->data) {
			continue;
		}
		pmpkg_t *cachepkg = i->data;
		if(_alpm_dep_edge(cachepkg, pkg)) {
			const char *cachepkgname = cachepkg->name;
			reqs = alpm_list_add(reqs, strdup(cachepkgname));
		}
	}
	return(reqs);
}

/** Compare two version strings and determine which one is 'newer'.
 * Returns a value comparable to the way strcmp works. Returns 1
 * if a is newer than b, 0 if a and b are the same version, or -1
 * if b is newer than a.
 *
 * This function has been adopted from the rpmvercmp function located
 * at lib/rpmvercmp.c, and was most recently updated against rpm
 * version 4.4.2.3. Small modifications have been made to make it more
 * consistent with the libalpm coding style.
 *
 * Keep in mind that the pkgrel is only compared if it is available
 * on both versions handed to this function. For example, comparing
 * 1.5-1 and 1.5 will yield 0; comparing 1.5-1 and 1.5-2 will yield
 * -1 as expected. This is mainly for supporting versioned dependencies
 * that do not include the pkgrel.
 */
int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
{
	char oldch1, oldch2;
	char *str1, *str2;
	char *ptr1, *ptr2;
	char *one, *two;
	int rc;
	int isnum;
	int ret = 0;

	ALPM_LOG_FUNC;

	/* libalpm added code. ensure our strings are not null */
	if(!a) {
		if(!b) return(0);
		return(-1);
	}
	if(!b) return(1);

	/* easy comparison to see if versions are identical */
	if(strcmp(a, b) == 0) return(0);

	str1 = strdup(a);
	str2 = strdup(b);

	one = str1;
	two = str2;

	/* loop through each version segment of str1 and str2 and compare them */
	while(*one && *two) {
		while(*one && !isalnum((int)*one)) one++;
		while(*two && !isalnum((int)*two)) two++;

		/* If we ran to the end of either, we are finished with the loop */
		if(!(*one && *two)) break;

		ptr1 = one;
		ptr2 = two;

		/* grab first completely alpha or completely numeric segment */
		/* leave one and two pointing to the start of the alpha or numeric */
		/* segment and walk ptr1 and ptr2 to end of segment */
		if(isdigit((int)*ptr1)) {
			while(*ptr1 && isdigit((int)*ptr1)) ptr1++;
			while(*ptr2 && isdigit((int)*ptr2)) ptr2++;
			isnum = 1;
		} else {
			while(*ptr1 && isalpha((int)*ptr1)) ptr1++;
			while(*ptr2 && isalpha((int)*ptr2)) ptr2++;
			isnum = 0;
		}

		/* save character at the end of the alpha or numeric segment */
		/* so that they can be restored after the comparison */
		oldch1 = *ptr1;
		*ptr1 = '\0';
		oldch2 = *ptr2;
		*ptr2 = '\0';

		/* this cannot happen, as we previously tested to make sure that */
		/* the first string has a non-null segment */
		if (one == ptr1) {
			ret = -1;	/* arbitrary */
			goto cleanup;
		}

		/* take care of the case where the two version segments are */
		/* different types: one numeric, the other alpha (i.e. empty) */
		/* numeric segments are always newer than alpha segments */
		/* XXX See patch #60884 (and details) from bugzilla #50977. */
		if (two == ptr2) {
			ret = isnum ? 1 : -1;
			goto cleanup;
		}

		if (isnum) {
			/* this used to be done by converting the digit segments */
			/* to ints using atoi() - it's changed because long  */
			/* digit segments can overflow an int - this should fix that. */

			/* throw away any leading zeros - it's a number, right? */
			while (*one == '0') one++;
			while (*two == '0') two++;

			/* whichever number has more digits wins */
			if (strlen(one) > strlen(two)) {
				ret = 1;
				goto cleanup;
			}
			if (strlen(two) > strlen(one)) {
				ret = -1;
				goto cleanup;
			}
		}

		/* strcmp will return which one is greater - even if the two */
		/* segments are alpha or if they are numeric.  don't return  */
		/* if they are equal because there might be more segments to */
		/* compare */
		rc = strcmp(one, two);
		if (rc) {
			ret = rc < 1 ? -1 : 1;
			goto cleanup;
		}

		/* restore character that was replaced by null above */
		*ptr1 = oldch1;
		one = ptr1;
		*ptr2 = oldch2;
		two = ptr2;

		/* libalpm added code. check if version strings have hit the pkgrel
		 * portion. depending on which strings have hit, take correct action.
		 * this is all based on the premise that we only have one dash in
		 * the version string, and it separates pkgver from pkgrel. */
		if(*ptr1 == '-' && *ptr2 == '-') {
			/* no-op, continue comparing since we are equivalent throughout */
		} else if(*ptr1 == '-') {
			/* ptr1 has hit the pkgrel and ptr2 has not. continue version
			 * comparison after stripping the pkgrel from ptr1. */
			*ptr1 = '\0';
		} else if(*ptr2 == '-') {
			/* ptr2 has hit the pkgrel and ptr1 has not. continue version
			 * comparison after stripping the pkgrel from ptr2. */
			*ptr2 = '\0';
		}
	}

	/* this catches the case where all numeric and alpha segments have */
	/* compared identically but the segment separating characters were */
	/* different */
	if ((!*one) && (!*two)) {
		ret = 0;
		goto cleanup;
	}

	/* the final showdown. we never want a remaining alpha string to
	 * beat an empty string. the logic is a bit weird, but:
	 * - if one is empty and two is not an alpha, two is newer.
	 * - if one is an alpha, two is newer.
	 * - otherwise one is newer.
	 * */
	if ( ( !*one && !isalpha((int)*two) )
			|| isalpha((int)*one) ) {
		ret = -1;
	} else {
		ret = 1;
	}

cleanup:
	free(str1);
	free(str2);
	return(ret);
}

/** @} */

pmpkg_t *_alpm_pkg_new(void)
{
	pmpkg_t* pkg;

	ALPM_LOG_FUNC;

	CALLOC(pkg, 1, sizeof(pmpkg_t), RET_ERR(PM_ERR_MEMORY, NULL));

	return(pkg);
}

pmpkg_t *_alpm_pkg_dup(pmpkg_t *pkg)
{
	pmpkg_t *newpkg;
	alpm_list_t *i;

	ALPM_LOG_FUNC;

	CALLOC(newpkg, 1, sizeof(pmpkg_t), RET_ERR(PM_ERR_MEMORY, NULL));

	STRDUP(newpkg->filename, pkg->filename, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->name, pkg->name, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->version, pkg->version, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->desc, pkg->desc, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->url, pkg->url, RET_ERR(PM_ERR_MEMORY, newpkg));
	newpkg->builddate = pkg->builddate;
	newpkg->installdate = pkg->installdate;
	STRDUP(newpkg->packager, pkg->packager, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->md5sum, pkg->md5sum, RET_ERR(PM_ERR_MEMORY, newpkg));
	STRDUP(newpkg->arch, pkg->arch, RET_ERR(PM_ERR_MEMORY, newpkg));
	newpkg->size = pkg->size;
	newpkg->isize = pkg->isize;
	newpkg->scriptlet = pkg->scriptlet;
	newpkg->force = pkg->force;
	newpkg->reason = pkg->reason;

	newpkg->licenses   = alpm_list_strdup(pkg->licenses);
	newpkg->replaces   = alpm_list_strdup(pkg->replaces);
	newpkg->groups     = alpm_list_strdup(pkg->groups);
	newpkg->files      = alpm_list_strdup(pkg->files);
	newpkg->backup     = alpm_list_strdup(pkg->backup);
	for(i = pkg->depends; i; i = alpm_list_next(i)) {
		newpkg->depends = alpm_list_add(newpkg->depends, _alpm_dep_dup(i->data));
	}
	newpkg->optdepends = alpm_list_strdup(pkg->optdepends);
	newpkg->conflicts  = alpm_list_strdup(pkg->conflicts);
	newpkg->provides   = alpm_list_strdup(pkg->provides);
	newpkg->deltas     = alpm_list_copy_data(pkg->deltas, sizeof(pmdelta_t));

	/* internal */
	newpkg->origin = pkg->origin;
	if(newpkg->origin == PKG_FROM_FILE) {
		newpkg->origin_data.file = strdup(pkg->origin_data.file);
	} else {
		newpkg->origin_data.db = pkg->origin_data.db;
	}
	newpkg->infolevel = pkg->infolevel;

	return(newpkg);
}

void _alpm_pkg_free(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	if(pkg == NULL) {
		return;
	}

	FREE(pkg->filename);
	FREE(pkg->name);
	FREE(pkg->version);
	FREE(pkg->desc);
	FREE(pkg->url);
	FREE(pkg->packager);
	FREE(pkg->md5sum);
	FREE(pkg->arch);
	FREELIST(pkg->licenses);
	FREELIST(pkg->replaces);
	FREELIST(pkg->groups);
	FREELIST(pkg->files);
	FREELIST(pkg->backup);
	alpm_list_free_inner(pkg->depends, (alpm_list_fn_free)_alpm_dep_free);
	alpm_list_free(pkg->depends);
	FREELIST(pkg->optdepends);
	FREELIST(pkg->conflicts);
	FREELIST(pkg->provides);
	alpm_list_free_inner(pkg->deltas, (alpm_list_fn_free)_alpm_delta_free);
	alpm_list_free(pkg->deltas);
	alpm_list_free(pkg->delta_path);
	alpm_list_free(pkg->removes);

	if(pkg->origin == PKG_FROM_FILE) {
		FREE(pkg->origin_data.file);
	}
	FREE(pkg);
}

/* This function should be used when removing a target from upgrade/sync target list
 * Case 1: If pkg is a loaded package file (PKG_FROM_FILE), it will be freed.
 * Case 2: If pkg is a pkgcache entry (PKG_FROM_CACHE), it won't be freed,
 *         only the transaction specific fields of pkg will be freed.
 */
void _alpm_pkg_free_trans(pmpkg_t *pkg)
{
	ALPM_LOG_FUNC;

	if(pkg == NULL) {
		return;
	}

	if(pkg->origin == PKG_FROM_FILE) {
		_alpm_pkg_free(pkg);
		return;
	}

	alpm_list_free(pkg->removes);
	pkg->removes = NULL;
}

/* Is spkg an upgrade for locapkg? */
int _alpm_pkg_compare_versions(pmpkg_t *spkg, pmpkg_t *localpkg)
{
	int cmp = 0;

	ALPM_LOG_FUNC;

	cmp = alpm_pkg_vercmp(alpm_pkg_get_version(spkg),
			alpm_pkg_get_version(localpkg));

	if(cmp < 0 && alpm_pkg_has_force(spkg)) {
		cmp = 1;
	}

	return(cmp);
}

/* Helper function for comparing packages
 */
int _alpm_pkg_cmp(const void *p1, const void *p2)
{
	pmpkg_t *pkg1 = (pmpkg_t *)p1;
	pmpkg_t *pkg2 = (pmpkg_t *)p2;
	return(strcmp(pkg1->name, pkg2->name));
}

/* Test for existence of a package in a alpm_list_t*
 * of pmpkg_t*
 */
pmpkg_t *_alpm_pkg_find(alpm_list_t *haystack, const char *needle)
{
	alpm_list_t *lp;

	ALPM_LOG_FUNC;

	if(needle == NULL || haystack == NULL) {
		return(NULL);
	}

	for(lp = haystack; lp; lp = lp->next) {
		pmpkg_t *info = lp->data;

		if(info && strcmp(info->name, needle) == 0) {
			return(info);
		}
	}
	return(NULL);
}

/** Test if a package should be ignored.
 *
 * Checks if the package is ignored via IgnorePkg, or if the package is
 * in a group ignored via IgnoreGrp.
 *
 * @param pkg the package to test
 *
 * @return 1 if the package should be ignored, 0 otherwise
 */
int _alpm_pkg_should_ignore(pmpkg_t *pkg)
{
	alpm_list_t *groups = NULL;

	/* first see if the package is ignored */
	if(alpm_list_find_str(handle->ignorepkg, alpm_pkg_get_name(pkg))) {
		return(1);
	}

	/* next see if the package is in a group that is ignored */
	for(groups = handle->ignoregrp; groups; groups = alpm_list_next(groups)) {
		char *grp = (char *)alpm_list_getdata(groups);
		if(alpm_list_find_str(alpm_pkg_get_groups(pkg), grp)) {
			return(1);
		}
	}

	return(0);
}

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