summaryrefslogtreecommitdiffstats
path: root/lib/libalpm/be_local.c
blob: 5d4a750873042896ffab5aeee312fdc45ae61908 (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
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
/*
 *  be_local.c : backend for the local database
 *
 *  Copyright (c) 2006-2019 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdint.h> /* intmax_t */
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h> /* PATH_MAX */

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

/* libalpm */
#include "db.h"
#include "alpm_list.h"
#include "libarchive-compat.h"
#include "log.h"
#include "util.h"
#include "alpm.h"
#include "handle.h"
#include "package.h"
#include "deps.h"
#include "filelist.h"

/* local database format version */
size_t ALPM_LOCAL_DB_VERSION = 9;

static int local_db_read(alpm_pkg_t *info, int inforeq);

#define LAZY_LOAD(info) \
	do { \
		if(!(pkg->infolevel & info)) { \
			local_db_read(pkg, info); \
		} \
	} while(0)


/* Cache-specific accessor functions. These implementations allow for lazy
 * loading by the files backend when a data member is actually needed
 * rather than loading all pieces of information when the package is first
 * initialized.
 */

static const char *_cache_get_base(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->base;
}

static const char *_cache_get_desc(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->desc;
}

static const char *_cache_get_url(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->url;
}

static alpm_time_t _cache_get_builddate(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->builddate;
}

static alpm_time_t _cache_get_installdate(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->installdate;
}

static const char *_cache_get_packager(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->packager;
}

static const char *_cache_get_arch(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->arch;
}

static off_t _cache_get_isize(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->isize;
}

static alpm_pkgreason_t _cache_get_reason(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->reason;
}

static int _cache_get_validation(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->validation;
}

static alpm_list_t *_cache_get_licenses(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->licenses;
}

static alpm_list_t *_cache_get_groups(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->groups;
}

static int _cache_has_scriptlet(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_SCRIPTLET);
	return pkg->scriptlet;
}

static alpm_list_t *_cache_get_depends(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->depends;
}

static alpm_list_t *_cache_get_optdepends(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->optdepends;
}

static alpm_list_t *_cache_get_makedepends(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->makedepends;
}

static alpm_list_t *_cache_get_checkdepends(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->checkdepends;
}

static alpm_list_t *_cache_get_conflicts(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->conflicts;
}

static alpm_list_t *_cache_get_provides(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->provides;
}

static alpm_list_t *_cache_get_replaces(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_DESC);
	return pkg->replaces;
}

static alpm_filelist_t *_cache_get_files(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_FILES);
	return &(pkg->files);
}

static alpm_list_t *_cache_get_backup(alpm_pkg_t *pkg)
{
	LAZY_LOAD(INFRQ_FILES);
	return pkg->backup;
}

/**
 * Open a package changelog for reading. Similar to fopen in functionality,
 * except that the returned 'file stream' is from the database.
 * @param pkg the package (from db) to read the changelog
 * @return a 'file stream' to the package changelog
 */
static void *_cache_changelog_open(alpm_pkg_t *pkg)
{
	alpm_db_t *db = alpm_pkg_get_db(pkg);
	char *clfile = _alpm_local_db_pkgpath(db, pkg, "changelog");
	FILE *f = fopen(clfile, "r");
	free(clfile);
	return f;
}

/**
 * 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
 */
static size_t _cache_changelog_read(void *ptr, size_t size,
		const alpm_pkg_t UNUSED *pkg, void *fp)
{
	return fread(ptr, 1, size, (FILE *)fp);
}

/**
 * Close a package changelog for reading. Similar to fclose in functionality,
 * except that the 'file stream' is 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
 */
static int _cache_changelog_close(const alpm_pkg_t UNUSED *pkg, void *fp)
{
	return fclose((FILE *)fp);
}

/**
 * Open a package mtree file for reading.
 * @param pkg the local package to read the changelog of
 * @return a archive structure for the package mtree file
 */
static struct archive *_cache_mtree_open(alpm_pkg_t *pkg)
{
	int r;
	struct archive *mtree;

	alpm_db_t *db = alpm_pkg_get_db(pkg);
	char *mtfile = _alpm_local_db_pkgpath(db, pkg, "mtree");

	if(access(mtfile, F_OK) != 0) {
		/* there is no mtree file for this package */
		goto error;
	}

	if((mtree = archive_read_new()) == NULL) {
		pkg->handle->pm_errno = ALPM_ERR_LIBARCHIVE;
		goto error;
	}

	_alpm_archive_read_support_filter_all(mtree);
	archive_read_support_format_mtree(mtree);

	if((r = _alpm_archive_read_open_file(mtree, mtfile, ALPM_BUFFER_SIZE))) {
		_alpm_log(pkg->handle, ALPM_LOG_ERROR, _("error while reading file %s: %s\n"),
					mtfile, archive_error_string(mtree));
		pkg->handle->pm_errno = ALPM_ERR_LIBARCHIVE;
		_alpm_archive_read_free(mtree);
		goto error;
	}

	free(mtfile);
	return mtree;

error:
	free(mtfile);
	return NULL;
}

/**
 * Read next entry from a package mtree file.
 * @param pkg the package that the mtree file is being read from
 * @param archive the archive structure reading from the mtree file
 * @param entry an archive_entry to store the entry header information
 * @return 0 if end of archive is reached, non-zero otherwise.
 */
static int _cache_mtree_next(const alpm_pkg_t UNUSED *pkg,
		struct archive *mtree, struct archive_entry **entry)
{
	return archive_read_next_header(mtree, entry);
}

/**
 * Close a package mtree file for reading.
 * @param pkg the package that the mtree file was read from
 * @param mtree the archive structure use for reading from the mtree file
 * @return whether closing the package changelog stream was successful
 */
static int _cache_mtree_close(const alpm_pkg_t UNUSED *pkg,
		struct archive *mtree)
{
	return _alpm_archive_read_free(mtree);
}

static int _cache_force_load(alpm_pkg_t *pkg)
{
	return local_db_read(pkg, INFRQ_ALL);
}


/** The local database operations struct. Get package fields through
 * lazy accessor methods that handle any backend loading and caching
 * logic.
 */
static struct pkg_operations local_pkg_ops = {
	.get_base = _cache_get_base,
	.get_desc = _cache_get_desc,
	.get_url = _cache_get_url,
	.get_builddate = _cache_get_builddate,
	.get_installdate = _cache_get_installdate,
	.get_packager = _cache_get_packager,
	.get_arch = _cache_get_arch,
	.get_isize = _cache_get_isize,
	.get_reason = _cache_get_reason,
	.get_validation = _cache_get_validation,
	.has_scriptlet = _cache_has_scriptlet,
	.get_licenses = _cache_get_licenses,
	.get_groups = _cache_get_groups,
	.get_depends = _cache_get_depends,
	.get_optdepends = _cache_get_optdepends,
	.get_makedepends = _cache_get_makedepends,
	.get_checkdepends = _cache_get_checkdepends,
	.get_conflicts = _cache_get_conflicts,
	.get_provides = _cache_get_provides,
	.get_replaces = _cache_get_replaces,
	.get_files = _cache_get_files,
	.get_backup = _cache_get_backup,

	.changelog_open = _cache_changelog_open,
	.changelog_read = _cache_changelog_read,
	.changelog_close = _cache_changelog_close,

	.mtree_open = _cache_mtree_open,
	.mtree_next = _cache_mtree_next,
	.mtree_close = _cache_mtree_close,

	.force_load = _cache_force_load,
};

static int checkdbdir(alpm_db_t *db)
{
	struct stat buf;
	const char *path = _alpm_db_path(db);

	if(stat(path, &buf) != 0) {
		_alpm_log(db->handle, ALPM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
				path);
		if(_alpm_makepath(path) != 0) {
			RET_ERR(db->handle, ALPM_ERR_SYSTEM, -1);
		}
	} else if(!S_ISDIR(buf.st_mode)) {
		_alpm_log(db->handle, ALPM_LOG_WARNING, _("removing invalid database: %s\n"), path);
		if(unlink(path) != 0 || _alpm_makepath(path) != 0) {
			RET_ERR(db->handle, ALPM_ERR_SYSTEM, -1);
		}
	}
	return 0;
}

static int is_dir(const char *path, struct dirent *entry)
{
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
	if(entry->d_type != DT_UNKNOWN) {
		return (entry->d_type == DT_DIR);
	}
#endif
	{
		char buffer[PATH_MAX];
		struct stat sbuf;

		snprintf(buffer, PATH_MAX, "%s/%s", path, entry->d_name);

		if(!stat(buffer, &sbuf)) {
			return S_ISDIR(sbuf.st_mode);
		}
	}

	return 0;
}

static int local_db_add_version(alpm_db_t UNUSED *db, const char *dbpath)
{
	char dbverpath[PATH_MAX];
	FILE *dbverfile;

	snprintf(dbverpath, PATH_MAX, "%sALPM_DB_VERSION", dbpath);

	dbverfile = fopen(dbverpath, "w");

	if(dbverfile == NULL) {
		return 1;
	}

	fprintf(dbverfile, "%zu\n", ALPM_LOCAL_DB_VERSION);
	fclose(dbverfile);

	return 0;
}

static int local_db_create(alpm_db_t *db, const char *dbpath)
{
	if(mkdir(dbpath, 0755) != 0) {
		_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not create directory %s: %s\n"),
				dbpath, strerror(errno));
		RET_ERR(db->handle, ALPM_ERR_DB_CREATE, -1);
	}
	if(local_db_add_version(db, dbpath) != 0) {
		return 1;
	}

	return 0;
}

static int local_db_validate(alpm_db_t *db)
{
	struct dirent *ent = NULL;
	const char *dbpath;
	DIR *dbdir;
	char dbverpath[PATH_MAX];
	FILE *dbverfile;
	int t;
	size_t version;

	if(db->status & DB_STATUS_VALID) {
		return 0;
	}
	if(db->status & DB_STATUS_INVALID) {
		return -1;
	}

	dbpath = _alpm_db_path(db);
	if(dbpath == NULL) {
		RET_ERR(db->handle, ALPM_ERR_DB_OPEN, -1);
	}

	dbdir = opendir(dbpath);
	if(dbdir == NULL) {
		if(errno == ENOENT) {
			/* local database dir doesn't exist yet - create it */
			if(local_db_create(db, dbpath) == 0) {
				db->status |= DB_STATUS_VALID;
				db->status &= ~DB_STATUS_INVALID;
				db->status |= DB_STATUS_EXISTS;
				db->status &= ~DB_STATUS_MISSING;
				return 0;
			} else {
				db->status &= ~DB_STATUS_EXISTS;
				db->status |= DB_STATUS_MISSING;
				/* pm_errno is set by local_db_create */
				return -1;
			}
		} else {
			RET_ERR(db->handle, ALPM_ERR_DB_OPEN, -1);
		}
	}
	db->status |= DB_STATUS_EXISTS;
	db->status &= ~DB_STATUS_MISSING;

	snprintf(dbverpath, PATH_MAX, "%sALPM_DB_VERSION", dbpath);

	if((dbverfile = fopen(dbverpath, "r")) == NULL) {
		/* create dbverfile if local database is empty - otherwise version error */
		while((ent = readdir(dbdir)) != NULL) {
			const char *name = ent->d_name;
			if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
				continue;
			} else {
				goto version_error;
			}
		}

		if(local_db_add_version(db, dbpath) != 0) {
			goto version_error;
		}
		goto version_latest;
	}

	t = fscanf(dbverfile, "%zu", &version);
	fclose(dbverfile);

	if(t != 1) {
		goto version_error;
	}

	if(version != ALPM_LOCAL_DB_VERSION) {
		goto version_error;
	}

version_latest:
	closedir(dbdir);
	db->status |= DB_STATUS_VALID;
	db->status &= ~DB_STATUS_INVALID;
	return 0;

version_error:
	closedir(dbdir);
	db->status &= ~DB_STATUS_VALID;
	db->status |= DB_STATUS_INVALID;
	db->handle->pm_errno = ALPM_ERR_DB_VERSION;
	return -1;
}

static int local_db_populate(alpm_db_t *db)
{
	size_t est_count;
	size_t count = 0;
	struct stat buf;
	struct dirent *ent = NULL;
	const char *dbpath;
	DIR *dbdir;

	if(db->status & DB_STATUS_INVALID) {
		RET_ERR(db->handle, ALPM_ERR_DB_INVALID, -1);
	}
	if(db->status & DB_STATUS_MISSING) {
		RET_ERR(db->handle, ALPM_ERR_DB_NOT_FOUND, -1);
	}

	dbpath = _alpm_db_path(db);
	if(dbpath == NULL) {
		/* pm_errno set in _alpm_db_path() */
		return -1;
	}

	dbdir = opendir(dbpath);
	if(dbdir == NULL) {
		RET_ERR(db->handle, ALPM_ERR_DB_OPEN, -1);
	}
	if(fstat(dirfd(dbdir), &buf) != 0) {
		RET_ERR(db->handle, ALPM_ERR_DB_OPEN, -1);
	}
	db->status |= DB_STATUS_EXISTS;
	db->status &= ~DB_STATUS_MISSING;
	if(buf.st_nlink >= 2) {
		est_count = buf.st_nlink;
	} else {
		/* Some filesystems don't subscribe to the two-implicit links school of
		 * thought, e.g. BTRFS, HFS+. See
		 * http://kerneltrap.org/mailarchive/linux-btrfs/2010/1/23/6723483/thread
		 */
		est_count = 0;
		while(readdir(dbdir) != NULL) {
			est_count++;
		}
		rewinddir(dbdir);
	}
	if(est_count >= 2) {
		/* subtract the '.' and '..' pointers to get # of children */
		est_count -= 2;
	}

	db->pkgcache = _alpm_pkghash_create(est_count);
	if(db->pkgcache == NULL){
		closedir(dbdir);
		RET_ERR(db->handle, ALPM_ERR_MEMORY, -1);
	}

	while((ent = readdir(dbdir)) != NULL) {
		const char *name = ent->d_name;

		alpm_pkg_t *pkg;

		if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
			continue;
		}
		if(!is_dir(dbpath, ent)) {
			continue;
		}

		pkg = _alpm_pkg_new();
		if(pkg == NULL) {
			closedir(dbdir);
			RET_ERR(db->handle, ALPM_ERR_MEMORY, -1);
		}
		/* split the db entry name */
		if(_alpm_splitname(name, &(pkg->name), &(pkg->version),
					&(pkg->name_hash)) != 0) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("invalid name for database entry '%s'\n"),
					name);
			_alpm_pkg_free(pkg);
			continue;
		}

		/* duplicated database entries are not allowed */
		if(_alpm_pkghash_find(db->pkgcache, pkg->name)) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("duplicated database entry '%s'\n"), pkg->name);
			_alpm_pkg_free(pkg);
			continue;
		}

		pkg->origin = ALPM_PKG_FROM_LOCALDB;
		pkg->origin_data.db = db;
		pkg->ops = &local_pkg_ops;
		pkg->handle = db->handle;

		/* explicitly read with only 'BASE' data, accessors will handle the rest */
		if(local_db_read(pkg, INFRQ_BASE) == -1) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("corrupted database entry '%s'\n"), name);
			_alpm_pkg_free(pkg);
			continue;
		}

		/* add to the collection */
		_alpm_log(db->handle, ALPM_LOG_FUNCTION, "adding '%s' to package cache for db '%s'\n",
				pkg->name, db->treename);
		if(_alpm_pkghash_add(&db->pkgcache, pkg) == NULL) {
			_alpm_pkg_free(pkg);
			RET_ERR(db->handle, ALPM_ERR_MEMORY, -1);
		}
		count++;
	}

	closedir(dbdir);
	if(count > 0) {
		db->pkgcache->list = alpm_list_msort(db->pkgcache->list, count, _alpm_pkg_cmp);
	}
	_alpm_log(db->handle, ALPM_LOG_DEBUG, "added %zu packages to package cache for db '%s'\n",
			count, db->treename);

	return 0;
}

/* Note: the return value must be freed by the caller */
char *_alpm_local_db_pkgpath(alpm_db_t *db, alpm_pkg_t *info,
		const char *filename)
{
	size_t len;
	char *pkgpath;
	const char *dbpath;

	dbpath = _alpm_db_path(db);
	len = strlen(dbpath) + strlen(info->name) + strlen(info->version) + 3;
	len += filename ? strlen(filename) : 0;
	MALLOC(pkgpath, len, RET_ERR(db->handle, ALPM_ERR_MEMORY, NULL));
	sprintf(pkgpath, "%s%s-%s/%s", dbpath, info->name, info->version,
			filename ? filename : "");
	return pkgpath;
}

#define READ_NEXT() do { \
	if(safe_fgets(line, sizeof(line), fp) == NULL && !feof(fp)) goto error; \
	_alpm_strip_newline(line, 0); \
} while(0)

#define READ_AND_STORE(f) do { \
	READ_NEXT(); \
	STRDUP(f, line, goto error); \
} while(0)

#define READ_AND_STORE_ALL(f) do { \
	char *linedup; \
	if(safe_fgets(line, sizeof(line), fp) == NULL) {\
		if(!feof(fp)) goto error; else break; \
	} \
	if(_alpm_strip_newline(line, 0) == 0) break; \
	STRDUP(linedup, line, goto error); \
	f = alpm_list_add(f, linedup); \
} while(1) /* note the while(1) and not (0) */

#define READ_AND_SPLITDEP(f) do { \
	if(safe_fgets(line, sizeof(line), fp) == NULL) {\
		if(!feof(fp)) goto error; else break; \
	} \
	if(_alpm_strip_newline(line, 0) == 0) break; \
	f = alpm_list_add(f, alpm_dep_from_string(line)); \
} while(1) /* note the while(1) and not (0) */

static int local_db_read(alpm_pkg_t *info, int inforeq)
{
	FILE *fp = NULL;
	char line[1024];
	alpm_db_t *db = info->origin_data.db;

	/* bitmask logic here:
	 * infolevel: 00001111
	 * inforeq:   00010100
	 * & result:  00000100
	 * == to inforeq? nope, we need to load more info. */
	if((info->infolevel & inforeq) == inforeq) {
		/* already loaded all of this info, do nothing */
		return 0;
	}

	if(info->infolevel & INFRQ_ERROR) {
		/* We've encountered an error loading this package before. Don't attempt
		 * repeated reloads, just give up. */
		return -1;
	}

	_alpm_log(db->handle, ALPM_LOG_FUNCTION,
			"loading package data for %s : level=0x%x\n",
			info->name, inforeq);

	/* clear out 'line', to be certain - and to make valgrind happy */
	memset(line, 0, sizeof(line));

	/* DESC */
	if(inforeq & INFRQ_DESC && !(info->infolevel & INFRQ_DESC)) {
		char *path = _alpm_local_db_pkgpath(db, info, "desc");
		if(!path || (fp = fopen(path, "r")) == NULL) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
			free(path);
			goto error;
		}
		free(path);
		while(!feof(fp)) {
			if(safe_fgets(line, sizeof(line), fp) == NULL && !feof(fp)) {
				goto error;
			}
			if(_alpm_strip_newline(line, 0) == 0) {
				/* length of stripped line was zero */
				continue;
			}
			if(strcmp(line, "%NAME%") == 0) {
				READ_NEXT();
				if(strcmp(line, info->name) != 0) {
					_alpm_log(db->handle, ALPM_LOG_ERROR, _("%s database is inconsistent: name "
								"mismatch on package %s\n"), db->treename, info->name);
				}
			} else if(strcmp(line, "%VERSION%") == 0) {
				READ_NEXT();
				if(strcmp(line, info->version) != 0) {
					_alpm_log(db->handle, ALPM_LOG_ERROR, _("%s database is inconsistent: version "
								"mismatch on package %s\n"), db->treename, info->name);
				}
			} else if(strcmp(line, "%BASE%") == 0) {
				READ_AND_STORE(info->base);
			} else if(strcmp(line, "%DESC%") == 0) {
				READ_AND_STORE(info->desc);
			} else if(strcmp(line, "%GROUPS%") == 0) {
				READ_AND_STORE_ALL(info->groups);
			} else if(strcmp(line, "%URL%") == 0) {
				READ_AND_STORE(info->url);
			} else if(strcmp(line, "%LICENSE%") == 0) {
				READ_AND_STORE_ALL(info->licenses);
			} else if(strcmp(line, "%ARCH%") == 0) {
				READ_AND_STORE(info->arch);
			} else if(strcmp(line, "%BUILDDATE%") == 0) {
				READ_NEXT();
				info->builddate = _alpm_parsedate(line);
			} else if(strcmp(line, "%INSTALLDATE%") == 0) {
				READ_NEXT();
				info->installdate = _alpm_parsedate(line);
			} else if(strcmp(line, "%PACKAGER%") == 0) {
				READ_AND_STORE(info->packager);
			} else if(strcmp(line, "%REASON%") == 0) {
				READ_NEXT();
				info->reason = (alpm_pkgreason_t)atoi(line);
			} else if(strcmp(line, "%VALIDATION%") == 0) {
				alpm_list_t *i, *v = NULL;
				READ_AND_STORE_ALL(v);
				for(i = v; i; i = alpm_list_next(i))
				{
					if(strcmp(i->data, "none") == 0) {
						info->validation |= ALPM_PKG_VALIDATION_NONE;
					} else if(strcmp(i->data, "md5") == 0) {
						info->validation |= ALPM_PKG_VALIDATION_MD5SUM;
					} else if(strcmp(i->data, "sha256") == 0) {
						info->validation |= ALPM_PKG_VALIDATION_SHA256SUM;
					} else if(strcmp(i->data, "pgp") == 0) {
						info->validation |= ALPM_PKG_VALIDATION_SIGNATURE;
					} else {
						_alpm_log(db->handle, ALPM_LOG_WARNING,
								_("unknown validation type for package %s: %s\n"),
								info->name, (const char *)i->data);
					}
				}
				FREELIST(v);
			} else if(strcmp(line, "%SIZE%") == 0) {
				READ_NEXT();
				info->isize = _alpm_strtoofft(line);
			} else if(strcmp(line, "%REPLACES%") == 0) {
				READ_AND_SPLITDEP(info->replaces);
			} else if(strcmp(line, "%DEPENDS%") == 0) {
				READ_AND_SPLITDEP(info->depends);
			} else if(strcmp(line, "%OPTDEPENDS%") == 0) {
				READ_AND_SPLITDEP(info->optdepends);
			} else if(strcmp(line, "%MAKEDEPENDS%") == 0) {
				READ_AND_SPLITDEP(info->makedepends);
			} else if(strcmp(line, "%CHECKDEPENDS%") == 0) {
				READ_AND_SPLITDEP(info->checkdepends);
			} else if(strcmp(line, "%CONFLICTS%") == 0) {
				READ_AND_SPLITDEP(info->conflicts);
			} else if(strcmp(line, "%PROVIDES%") == 0) {
				READ_AND_SPLITDEP(info->provides);
			}
		}
		fclose(fp);
		fp = NULL;
		info->infolevel |= INFRQ_DESC;
	}

	/* FILES */
	if(inforeq & INFRQ_FILES && !(info->infolevel & INFRQ_FILES)) {
		char *path = _alpm_local_db_pkgpath(db, info, "files");
		if(!path || (fp = fopen(path, "r")) == NULL) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
			free(path);
			goto error;
		}
		free(path);
		while(safe_fgets(line, sizeof(line), fp)) {
			_alpm_strip_newline(line, 0);
			if(strcmp(line, "%FILES%") == 0) {
				size_t files_count = 0, files_size = 0, len;
				alpm_file_t *files = NULL;

				while(safe_fgets(line, sizeof(line), fp) &&
						(len = _alpm_strip_newline(line, 0))) {
					if(!_alpm_greedy_grow((void **)&files, &files_size,
								(files_count ? (files_count + 1) * sizeof(alpm_file_t) : 8 * sizeof(alpm_file_t)))) {
						goto nomem;
					}
					/* since we know the length of the file string already,
					 * we can do malloc + memcpy rather than strdup */
					len += 1;
					MALLOC(files[files_count].name, len, goto nomem);
					memcpy(files[files_count].name, line, len);
					files_count++;
				}
				/* attempt to hand back any memory we don't need */
				if(files_count > 0) {
					alpm_file_t *newfiles;

					newfiles = realloc(files, sizeof(alpm_file_t) * files_count);
					if(newfiles != NULL) {
						files = newfiles;
					}
				} else {
					FREE(files);
				}
				info->files.count = files_count;
				info->files.files = files;
				_alpm_filelist_sort(&info->files);
				continue;
nomem:
				while(files_count > 0) {
					FREE(files[--files_count].name);
				}
				FREE(files);
				goto error;
			} else if(strcmp(line, "%BACKUP%") == 0) {
				while(safe_fgets(line, sizeof(line), fp) && _alpm_strip_newline(line, 0)) {
					alpm_backup_t *backup;
					CALLOC(backup, 1, sizeof(alpm_backup_t), goto error);
					if(_alpm_split_backup(line, &backup)) {
						FREE(backup);
						goto error;
					}
					info->backup = alpm_list_add(info->backup, backup);
				}
			}
		}
		fclose(fp);
		fp = NULL;
		info->infolevel |= INFRQ_FILES;
	}

	/* INSTALL */
	if(inforeq & INFRQ_SCRIPTLET && !(info->infolevel & INFRQ_SCRIPTLET)) {
		char *path = _alpm_local_db_pkgpath(db, info, "install");
		if(access(path, F_OK) == 0) {
			info->scriptlet = 1;
		}
		free(path);
		info->infolevel |= INFRQ_SCRIPTLET;
	}

	return 0;

error:
	info->infolevel |= INFRQ_ERROR;
	if(fp) {
		fclose(fp);
	}
	return -1;
}

int _alpm_local_db_prepare(alpm_db_t *db, alpm_pkg_t *info)
{
	mode_t oldmask;
	int retval = 0;
	char *pkgpath;

	if(checkdbdir(db) != 0) {
		return -1;
	}

	oldmask = umask(0000);
	pkgpath = _alpm_local_db_pkgpath(db, info, NULL);

	if((retval = mkdir(pkgpath, 0755)) != 0) {
		_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not create directory %s: %s\n"),
				pkgpath, strerror(errno));
	}

	free(pkgpath);
	umask(oldmask);

	return retval;
}

static void write_deps(FILE *fp, const char *header, alpm_list_t *deplist)
{
	alpm_list_t *lp;
	if(!deplist) {
		return;
	}
	fputs(header, fp);
	fputc('\n', fp);
	for(lp = deplist; lp; lp = lp->next) {
		char *depstring = alpm_dep_compute_string(lp->data);
		fputs(depstring, fp);
		fputc('\n', fp);
		free(depstring);
	}
	fputc('\n', fp);
}

int _alpm_local_db_write(alpm_db_t *db, alpm_pkg_t *info, int inforeq)
{
	FILE *fp = NULL;
	mode_t oldmask;
	alpm_list_t *lp;
	int retval = 0;

	if(db == NULL || info == NULL || !(db->status & DB_STATUS_LOCAL)) {
		return -1;
	}

	/* make sure we have a sane umask */
	oldmask = umask(0022);

	/* DESC */
	if(inforeq & INFRQ_DESC) {
		char *path;
		_alpm_log(db->handle, ALPM_LOG_DEBUG,
				"writing %s-%s DESC information back to db\n",
				info->name, info->version);
		path = _alpm_local_db_pkgpath(db, info, "desc");
		if(!path || (fp = fopen(path, "w")) == NULL) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"),
					path, strerror(errno));
			retval = -1;
			free(path);
			goto cleanup;
		}
		free(path);
		fprintf(fp, "%%NAME%%\n%s\n\n"
						"%%VERSION%%\n%s\n\n", info->name, info->version);
		if(info->base) {
			fprintf(fp, "%%BASE%%\n"
							"%s\n\n", info->base);
		}
		if(info->desc) {
			fprintf(fp, "%%DESC%%\n"
							"%s\n\n", info->desc);
		}
		if(info->url) {
			fprintf(fp, "%%URL%%\n"
							"%s\n\n", info->url);
		}
		if(info->arch) {
			fprintf(fp, "%%ARCH%%\n"
							"%s\n\n", info->arch);
		}
		if(info->builddate) {
			fprintf(fp, "%%BUILDDATE%%\n"
							"%jd\n\n", (intmax_t)info->builddate);
		}
		if(info->installdate) {
			fprintf(fp, "%%INSTALLDATE%%\n"
							"%jd\n\n", (intmax_t)info->installdate);
		}
		if(info->packager) {
			fprintf(fp, "%%PACKAGER%%\n"
							"%s\n\n", info->packager);
		}
		if(info->isize) {
			/* only write installed size, csize is irrelevant once installed */
			fprintf(fp, "%%SIZE%%\n"
							"%jd\n\n", (intmax_t)info->isize);
		}
		if(info->reason) {
			fprintf(fp, "%%REASON%%\n"
							"%u\n\n", info->reason);
		}
		if(info->groups) {
			fputs("%GROUPS%\n", fp);
			for(lp = info->groups; lp; lp = lp->next) {
				fputs(lp->data, fp);
				fputc('\n', fp);
			}
			fputc('\n', fp);
		}
		if(info->licenses) {
			fputs("%LICENSE%\n", fp);
			for(lp = info->licenses; lp; lp = lp->next) {
				fputs(lp->data, fp);
				fputc('\n', fp);
			}
			fputc('\n', fp);
		}
		if(info->validation) {
			fputs("%VALIDATION%\n", fp);
			if(info->validation & ALPM_PKG_VALIDATION_NONE) {
				fputs("none\n", fp);
			}
			if(info->validation & ALPM_PKG_VALIDATION_MD5SUM) {
				fputs("md5\n", fp);
			}
			if(info->validation & ALPM_PKG_VALIDATION_SHA256SUM) {
				fputs("sha256\n", fp);
			}
			if(info->validation & ALPM_PKG_VALIDATION_SIGNATURE) {
				fputs("pgp\n", fp);
			}
			fputc('\n', fp);
		}

		write_deps(fp, "%REPLACES%", info->replaces);
		write_deps(fp, "%DEPENDS%", info->depends);
		write_deps(fp, "%OPTDEPENDS%", info->optdepends);
		write_deps(fp, "%CONFLICTS%", info->conflicts);
		write_deps(fp, "%PROVIDES%", info->provides);

		fclose(fp);
		fp = NULL;
	}

	/* FILES */
	if(inforeq & INFRQ_FILES) {
		char *path;
		_alpm_log(db->handle, ALPM_LOG_DEBUG,
				"writing %s-%s FILES information back to db\n",
				info->name, info->version);
		path = _alpm_local_db_pkgpath(db, info, "files");
		if(!path || (fp = fopen(path, "w")) == NULL) {
			_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"),
					path, strerror(errno));
			retval = -1;
			free(path);
			goto cleanup;
		}
		free(path);
		if(info->files.count) {
			size_t i;
			fputs("%FILES%\n", fp);
			for(i = 0; i < info->files.count; i++) {
				const alpm_file_t *file = info->files.files + i;
				fputs(file->name, fp);
				fputc('\n', fp);
			}
			fputc('\n', fp);
		}
		if(info->backup) {
			fputs("%BACKUP%\n", fp);
			for(lp = info->backup; lp; lp = lp->next) {
				const alpm_backup_t *backup = lp->data;
				fprintf(fp, "%s\t%s\n", backup->name, backup->hash);
			}
			fputc('\n', fp);
		}
		fclose(fp);
		fp = NULL;
	}

	/* INSTALL and MTREE */
	/* nothing needed here (automatically extracted) */

cleanup:
	umask(oldmask);
	return retval;
}

int _alpm_local_db_remove(alpm_db_t *db, alpm_pkg_t *info)
{
	int ret = 0;
	DIR *dirp;
	struct dirent *dp;
	char *pkgpath;
	size_t pkgpath_len;

	pkgpath = _alpm_local_db_pkgpath(db, info, NULL);
	if(!pkgpath) {
		return -1;
	}
	pkgpath_len = strlen(pkgpath);

	dirp = opendir(pkgpath);
	if(!dirp) {
		free(pkgpath);
		return -1;
	}
	/* go through the local DB entry, removing the files within, which we know
	 * are not nested directories of any kind. */
	for(dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
		if(strcmp(dp->d_name, "..") != 0 && strcmp(dp->d_name, ".") != 0) {
			char name[PATH_MAX];
			if(pkgpath_len + strlen(dp->d_name) + 2 > PATH_MAX) {
				/* file path is too long to remove, hmm. */
				ret = -1;
			} else {
				sprintf(name, "%s/%s", pkgpath, dp->d_name);
				if(unlink(name)) {
					ret = -1;
				}
			}
		}
	}
	closedir(dirp);

	/* after removing all enclosed files, we can remove the directory itself. */
	if(rmdir(pkgpath)) {
		ret = -1;
	}
	free(pkgpath);
	return ret;
}

int SYMEXPORT alpm_pkg_set_reason(alpm_pkg_t *pkg, alpm_pkgreason_t reason)
{
	ASSERT(pkg != NULL, return -1);
	ASSERT(pkg->origin == ALPM_PKG_FROM_LOCALDB,
			RET_ERR(pkg->handle, ALPM_ERR_WRONG_ARGS, -1));
	ASSERT(pkg->origin_data.db == pkg->handle->db_local,
			RET_ERR(pkg->handle, ALPM_ERR_WRONG_ARGS, -1));

	_alpm_log(pkg->handle, ALPM_LOG_DEBUG,
			"setting install reason %u for %s\n", reason, pkg->name);
	if(alpm_pkg_get_reason(pkg) == reason) {
		/* we are done */
		return 0;
	}
	/* set reason (in pkgcache) */
	pkg->reason = reason;
	/* write DESC */
	if(_alpm_local_db_write(pkg->handle->db_local, pkg, INFRQ_DESC)) {
		RET_ERR(pkg->handle, ALPM_ERR_DB_WRITE, -1);
	}

	return 0;
}

struct db_operations local_db_ops = {
	.validate         = local_db_validate,
	.populate         = local_db_populate,
	.unregister       = _alpm_db_unregister,
};

alpm_db_t *_alpm_db_register_local(alpm_handle_t *handle)
{
	alpm_db_t *db;

	_alpm_log(handle, ALPM_LOG_DEBUG, "registering local database\n");

	db = _alpm_db_new("local", 1);
	if(db == NULL) {
		handle->pm_errno = ALPM_ERR_DB_CREATE;
		return NULL;
	}
	db->ops = &local_db_ops;
	db->handle = handle;
	db->usage = ALPM_DB_USAGE_ALL;

	if(local_db_validate(db)) {
		/* pm_errno set in local_db_validate() */
		_alpm_db_free(db);
		return NULL;
	}

	handle->db_local = db;
	return db;
}