summaryrefslogtreecommitdiffstats
path: root/libopkg/opkg_install.c
blob: e014d720c377fa3e4b113f07095097552a36bfba (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
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
/* opkg_install.c - the opkg package management system

   Carl D. Worth

   Copyright (C) 2001 University of Southern California

   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, 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.
*/

#include "config.h"

#include <stdio.h>
#include <time.h>
#include <signal.h>
#include <unistd.h>

#include "pkg.h"
#include "pkg_hash.h"
#include "pkg_extract.h"

#include "opkg_install.h"
#include "opkg_configure.h"
#include "opkg_download.h"
#include "opkg_remove.h"

#include "opkg_utils.h"
#include "opkg_message.h"
#include "opkg_cmd.h"
#include "opkg_defines.h"

#include "sprintf_alloc.h"
#include "file_util.h"
#include "xsystem.h"
#include "libbb/libbb.h"

static int
satisfy_dependencies_for(pkg_t *pkg)
{
     int i, err;
     pkg_vec_t *depends = pkg_vec_alloc();
     pkg_t *dep;
     char **tmp, **unresolved = NULL;
     int ndepends;

     ndepends = pkg_hash_fetch_unsatisfied_dependencies(pkg, depends, 
							&unresolved);

     if (unresolved) {
	  opkg_msg(ERROR, "Cannot satisfy the following dependencies for %s:\n",
		       pkg->name);
	  tmp = unresolved;
	  while (*unresolved) {
	       opkg_msg(ERROR, "\t%s", *unresolved);
	       free(*unresolved);
	       unresolved++;
	  }
	  free(tmp);
	  opkg_message(ERROR, "\n");
	  if (! conf->force_depends) {
	       opkg_msg(INFO,
			    "This could mean that your package list is out of date or that the packages\n"
			    "mentioned above do not yet exist (try 'opkg update'). To proceed in spite\n"
			    "of this problem try again with the '-force-depends' option.\n");
	       pkg_vec_free(depends);
	       return -1;
	  }
     }

     if (ndepends <= 0) {
	  pkg_vec_free(depends);
	  return 0;
     }

     /* Mark packages as to-be-installed */
     for (i=0; i < depends->len; i++) {
	  /* Dependencies should be installed the same place as pkg */
	  if (depends->pkgs[i]->dest == NULL) {
	       depends->pkgs[i]->dest = pkg->dest;
	  }
	  depends->pkgs[i]->state_want = SW_INSTALL;
     }

     for (i = 0; i < depends->len; i++) {
	  dep = depends->pkgs[i];
	  /* The package was uninstalled when we started, but another
	     dep earlier in this loop may have depended on it and pulled
	     it in, so check first. */
	  if ((dep->state_status != SS_INSTALLED)
	      && (dep->state_status != SS_UNPACKED)) {
               opkg_msg(DEBUG2,"Calling opkg_install_pkg.\n");
	       err = opkg_install_pkg(dep, 0);
	       /* mark this package as having been automatically installed to
	        * satisfy a dependancy */
	       dep->auto_installed = 1;
	       if (err) {
		    pkg_vec_free(depends);
		    return err;
	       }
	  }
     }

     pkg_vec_free(depends);

     return 0;
}

static int
check_conflicts_for(pkg_t *pkg)
{
     int i;
     pkg_vec_t *conflicts = NULL;
     message_level_t level;

     if (conf->force_depends) {
	  level = NOTICE;
     } else {
	  level = ERROR;
     }

     if (!conf->force_depends)
	  conflicts = pkg_hash_fetch_conflicts(pkg);

     if (conflicts) {
	  opkg_msg(level, "The following packages conflict with %s:\n",
		       pkg->name);
	  i = 0;
	  while (i < conflicts->len)
	       opkg_msg(level, "\t%s", conflicts->pkgs[i++]->name);
	  opkg_msg(level, "\n");
	  pkg_vec_free(conflicts);
	  return -1;
     }
     return 0;
}

static int
update_file_ownership(pkg_t *new_pkg, pkg_t *old_pkg)
{
     str_list_t *new_list, *old_list;
     str_list_elt_t *iter, *niter;

     new_list = pkg_get_installed_files(new_pkg);
     if (new_list == NULL)
	     return -1;

     for (iter = str_list_first(new_list), niter = str_list_next(new_list, iter); 
             iter; 
             iter = niter, niter = str_list_next(new_list, niter)) {
	  char *new_file = (char *)iter->data;
	  pkg_t *owner = file_hash_get_file_owner(new_file);
	  if (!new_file)
	       opkg_msg(ERROR, "Null new_file for new_pkg=%s\n", new_pkg->name);
	  if (!owner || (owner == old_pkg))
	       file_hash_set_file_owner(new_file, new_pkg);
     }

     if (old_pkg) {
	  old_list = pkg_get_installed_files(old_pkg);
	  if (old_list == NULL) {
     		  pkg_free_installed_files(new_pkg);
		  return -1;
	  }

	  for (iter = str_list_first(old_list), niter = str_list_next(old_list, iter); 
                  iter; 
                  iter = niter, niter = str_list_next(old_list, niter)) {
	       char *old_file = (char *)iter->data;
	       pkg_t *owner = file_hash_get_file_owner(old_file);
	       if (owner == old_pkg) {
		    /* obsolete */
		    hash_table_insert(&conf->obs_file_hash, old_file, old_pkg);
	       }
	  }
          pkg_free_installed_files(old_pkg);
     }
     pkg_free_installed_files(new_pkg);
     return 0;
}

static int
verify_pkg_installable(pkg_t *pkg)
{
	unsigned long kbs_available, pkg_size_kbs;
	char *root_dir;

	if (conf->force_space || pkg->installed_size == 0)
		return 0;

	root_dir = pkg->dest ? pkg->dest->root_dir :
						conf->default_dest->root_dir;
	kbs_available = get_available_kbytes(root_dir);

	pkg_size_kbs = (pkg->installed_size + 1023)/1024;

	if (pkg_size_kbs >= kbs_available) {
		opkg_msg(ERROR, "Only have %dkb available on filesystem %s, "
			"pkg %s needs %d\n",
			kbs_available, root_dir, pkg->name, pkg_size_kbs);
		return -1;
	}

     return 0;
}

static int
unpack_pkg_control_files(pkg_t *pkg)
{
     int err;
     char *conffiles_file_name;
     char *root_dir;
     FILE *conffiles_file;

     sprintf_alloc(&pkg->tmp_unpack_dir, "%s/%s-XXXXXX", conf->tmp_dir, pkg->name);

     pkg->tmp_unpack_dir = mkdtemp(pkg->tmp_unpack_dir);
     if (pkg->tmp_unpack_dir == NULL) {
	  opkg_perror(ERROR, "Failed to create temporary directory '%s'",
		       pkg->tmp_unpack_dir);
	  return -1;
     }

     err = pkg_extract_control_files_to_dir(pkg, pkg->tmp_unpack_dir);
     if (err) {
	  return err;
     }

     /* XXX: CLEANUP: There might be a cleaner place to read in the
	conffiles. Seems like I should be able to get everything to go
	through pkg_init_from_file. If so, maybe it would make sense to
	move all of unpack_pkg_control_files to that function. */

     /* Don't need to re-read conffiles if we already have it */
     if (!nv_pair_list_empty(&pkg->conffiles)) {
	  return 0;
     }

     sprintf_alloc(&conffiles_file_name, "%s/conffiles", pkg->tmp_unpack_dir);
     if (! file_exists(conffiles_file_name)) {
	  free(conffiles_file_name);
	  return 0;
     }
    
     conffiles_file = fopen(conffiles_file_name, "r");
     if (conffiles_file == NULL) {
	  opkg_perror(ERROR, "Failed to open %s", conffiles_file_name);
	  free(conffiles_file_name);
	  return -1;
     }
     free(conffiles_file_name);

     while (1) {
	  char *cf_name;
	  char *cf_name_in_dest;

	  cf_name = file_read_line_alloc(conffiles_file);
	  if (cf_name == NULL) {
	       break;
	  }
	  if (cf_name[0] == '\0') {
	       continue;
	  }

	  /* Prepend dest->root_dir to conffile name.
	     Take pains to avoid multiple slashes. */
	  root_dir = pkg->dest->root_dir;
	  if (conf->offline_root)
	       /* skip the offline_root prefix */
	       root_dir = pkg->dest->root_dir + strlen(conf->offline_root);
	  sprintf_alloc(&cf_name_in_dest, "%s%s", root_dir,
			cf_name[0] == '/' ? (cf_name + 1) : cf_name);

	  /* Can't get an md5sum now, (file isn't extracted yet).
	     We'll wait until resolve_conffiles */
	  conffile_list_append(&pkg->conffiles, cf_name_in_dest, NULL);

	  free(cf_name);
	  free(cf_name_in_dest);
     }

     fclose(conffiles_file);

     return 0;
}

/*
 * Remove packages which were auto_installed due to a dependency by old_pkg,
 * which are no longer a dependency in the new (upgraded) pkg.
 */
static int
pkg_remove_orphan_dependent(pkg_t *pkg, pkg_t *old_pkg) 
{
	int i, j, k, l, found;
	int n_deps;
	pkg_t *p;
	struct compound_depend *cd0, *cd1;
        abstract_pkg_t **dependents;

	int count0 = old_pkg->pre_depends_count +
				old_pkg->depends_count +
				old_pkg->recommends_count +
				old_pkg->suggests_count;
	int count1 = pkg->pre_depends_count +
				pkg->depends_count +
				pkg->recommends_count +
				pkg->suggests_count;

	for (i=0; i<count0; i++) {
		cd0 = &old_pkg->depends[i];
		if (cd0->type != DEPEND)
			continue;
		for (j=0; j<cd0->possibility_count; j++) {

			found = 0;

			for (k=0; k<count1; k++) {
				cd1 = &pkg->depends[i];
				if (cd1->type != DEPEND)
					continue;
				for (l=0; l<cd1->possibility_count; l++) {
					if (cd0->possibilities[j]
					 == cd1->possibilities[l]) {
						found = 1;
						break;
					}
				}
				if (found)
					break;
			}

			if (found)
				continue;

			/*
			 * old_pkg has a dependency that pkg does not.
			 */
			p = pkg_hash_fetch_installed_by_name(
					cd0->possibilities[j]->pkg->name);

			if (!p)
				continue;

			if (!p->auto_installed)
				continue;

			n_deps = pkg_has_installed_dependents(p, &dependents);
			n_deps--; /* don't count old_pkg */

			if (n_deps == 0) {
				opkg_msg(NOTICE, "%s was autoinstalled and is "
						"now orphaned, removing.\n",
						p->name);

				/* p has one installed dependency (old_pkg),
				 * which we need to ignore during removal. */
				p->state_flag |= SF_REPLACE;

				opkg_remove_pkg(p, 0);
			} else 
				opkg_msg(INFO, "%s was autoinstalled and is "
						"still required by %d "
						"installed packages.\n",
						p->name, n_deps);

		}
	}

	return 0;
}

/* returns number of installed replacees */
static int
pkg_get_installed_replacees(pkg_t *pkg, pkg_vec_t *installed_replacees)
{
     abstract_pkg_t **replaces = pkg->replaces;
     int replaces_count = pkg->replaces_count;
     int i, j;
     for (i = 0; i < replaces_count; i++) {
	  abstract_pkg_t *ab_pkg = replaces[i];
	  pkg_vec_t *pkg_vec = ab_pkg->pkgs;
	  if (pkg_vec) {
	       for (j = 0; j < pkg_vec->len; j++) {
		    pkg_t *replacee = pkg_vec->pkgs[j];
		    if (!pkg_conflicts(pkg, replacee))
			 continue;
		    if (replacee->state_status == SS_INSTALLED) {
			 pkg_vec_insert(installed_replacees, replacee);
		    }
	       }
	  }
     }
     return installed_replacees->len;
}

static int
pkg_remove_installed_replacees(pkg_vec_t *replacees)
{
     int i;
     int replaces_count = replacees->len;
     for (i = 0; i < replaces_count; i++) {
	  pkg_t *replacee = replacees->pkgs[i];
	  int err;
	  replacee->state_flag |= SF_REPLACE; /* flag it so remove won't complain */
	  err = opkg_remove_pkg(replacee, 0);
	  if (err)
	       return err;
     }
     return 0;
}

/* to unwind the removal: make sure they are installed */
static int
pkg_remove_installed_replacees_unwind(pkg_vec_t *replacees)
{
     int i, err;
     int replaces_count = replacees->len;
     for (i = 0; i < replaces_count; i++) {
	  pkg_t *replacee = replacees->pkgs[i];
	  if (replacee->state_status != SS_INSTALLED) {
               opkg_msg(DEBUG2, "Calling opkg_install_pkg.\n");
	       err = opkg_install_pkg(replacee, 0);
	       if (err)
		    return err;
	  }
     }
     return 0;
}

/* compares versions of pkg and old_pkg, returns 0 if OK to proceed with installation of pkg, 1 otherwise */
static int
opkg_install_check_downgrade(pkg_t *pkg, pkg_t *old_pkg, int message)
{	  
     if (old_pkg) {
          char message_out[15];
	  char *old_version = pkg_version_str_alloc(old_pkg);
	  char *new_version = pkg_version_str_alloc(pkg);
	  int cmp = pkg_compare_versions(old_pkg, pkg);
	  int rc = 0;

          memset(message_out,'\x0',15);
          strncpy (message_out,"Upgrading ",strlen("Upgrading ")); 
          if ( (conf->force_downgrade==1) && (cmp > 0) ){     /* We've been asked to allow downgrade  and version is precedent */
             cmp = -1 ;                                       /* then we force opkg to downgrade */ 
             strncpy (message_out,"Downgrading ",strlen("Downgrading "));         /* We need to use a value < 0 because in the 0 case we are asking to */
                                                              /* reinstall, and some check could fail asking the "force-reinstall" option */
          } 

	  if (cmp > 0) {
              if(!conf->download_only)
                  opkg_msg(NOTICE,
                          "Not downgrading package %s on %s from %s to %s.\n",
                          old_pkg->name, old_pkg->dest->name, old_version, new_version);
	       rc = 1;
	  } else if (cmp < 0) {
              if(!conf->download_only)
                  opkg_msg(NOTICE, "%s%s on %s from %s to %s...\n",
                          message_out, pkg->name, old_pkg->dest->name, old_version, new_version);
	       pkg->dest = old_pkg->dest;
	       rc = 0;
	  } else /* cmp == 0 */ {
	       if (conf->force_reinstall) {
               if(!conf->download_only)
                   opkg_msg(NOTICE, "Reinstalling %s (%s) on %s...\n",
                           pkg->name, new_version, old_pkg->dest->name);
		    pkg->dest = old_pkg->dest;
		    rc = 0;
	       } else {
                   if(!conf->download_only)
                       opkg_msg(NOTICE, "%s (%s) already install on %s."
                               " Not reinstalling.\n",
                               pkg->name, new_version, old_pkg->dest->name);
		    rc = 1;
	       }
	  } 
	  free(old_version);
	  free(new_version);
	  return rc;
     } else {
      char message_out[15] ;
      memset(message_out,'\x0',15);
      if ( message ) 
          strncpy( message_out,"Upgrading ",strlen("Upgrading ") );
      else
          strncpy( message_out,"Installing ",strlen("Installing ") );
	  char *version = pkg_version_str_alloc(pkg);
      
      if(!conf->download_only)
          opkg_msg(NOTICE, "%s%s (%s) to %s...\n", message_out,
                  pkg->name, version, pkg->dest->name);
	  free(version);
	  return 0;
     }
}


static int
prerm_upgrade_old_pkg(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY:
	dpkg does some things here that we don't do yet. Do we care?
	
	1. If a version of the package is already installed, call
	   old-prerm upgrade new-version
	2. If the script runs but exits with a non-zero exit status
	   new-prerm failed-upgrade old-version
	   Error unwind, for both the above cases:
	   old-postinst abort-upgrade new-version
     */
     return 0;
}

static int
prerm_upgrade_old_pkg_unwind(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY:
	dpkg does some things here that we don't do yet. Do we care?
	(See prerm_upgrade_old_package for details)
     */
     return 0;
}

static int
prerm_deconfigure_conflictors(pkg_t *pkg, pkg_vec_t *conflictors)
{
     /* DPKG_INCOMPATIBILITY:
	dpkg does some things here that we don't do yet. Do we care?
	2. If a 'conflicting' package is being removed at the same time:
		1. If any packages depended on that conflicting package and
		   --auto-deconfigure is specified, call, for each such package:
		   deconfigured's-prerm deconfigure \
		   in-favour package-being-installed version \
		   removing conflicting-package version
		Error unwind:
		   deconfigured's-postinst abort-deconfigure \
		   in-favour package-being-installed-but-failed version \
		   removing conflicting-package version

		   The deconfigured packages are marked as requiring
		   configuration, so that if --install is used they will be
		   configured again if possible.
		2. To prepare for removal of the conflicting package, call:
		   conflictor's-prerm remove in-favour package new-version
		Error unwind:
		   conflictor's-postinst abort-remove in-favour package new-version
     */
     return 0;
}

static int
prerm_deconfigure_conflictors_unwind(pkg_t *pkg, pkg_vec_t *conflictors)
{
     /* DPKG_INCOMPATIBILITY: dpkg does some things here that we don't
	do yet. Do we care?  (See prerm_deconfigure_conflictors for
	details) */
     return 0;
}

static int
preinst_configure(pkg_t *pkg, pkg_t *old_pkg)
{
     int err;
     char *preinst_args;

     if (old_pkg) {
	  char *old_version = pkg_version_str_alloc(old_pkg);
	  sprintf_alloc(&preinst_args, "upgrade %s", old_version);
	  free(old_version);
     } else if (pkg->state_status == SS_CONFIG_FILES) {
	  char *pkg_version = pkg_version_str_alloc(pkg);
	  sprintf_alloc(&preinst_args, "install %s", pkg_version);
	  free(pkg_version);
     } else {
	  preinst_args = xstrdup("install");
     }

     err = pkg_run_script(pkg, "preinst", preinst_args);
     if (err) {
	  opkg_msg(ERROR, "Aborting installation of %s.\n", pkg->name);
	  return -1;
     }

     free(preinst_args);

     return 0;
}

static int
preinst_configure_unwind(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY:
	dpkg does the following error unwind, should we?
	pkg->postrm abort-upgrade old-version
	OR pkg->postrm abort-install old-version
	OR pkg->postrm abort-install
     */
     return 0;
}

static char *
backup_filename_alloc(const char *file_name)
{
     char *backup;

     sprintf_alloc(&backup, "%s%s", file_name, OPKG_BACKUP_SUFFIX);

     return backup;
}


static int
backup_make_backup(const char *file_name)
{
     int err;
     char *backup;
    
     backup = backup_filename_alloc(file_name);
     err = file_copy(file_name, backup);
     if (err) {
	  opkg_msg(ERROR, "Failed to copy %s to %s\n",
		       file_name, backup);
     }

     free(backup);

     return err;
}

static int
backup_exists_for(const char *file_name)
{
     int ret;
     char *backup;

     backup = backup_filename_alloc(file_name);

     ret = file_exists(backup);

     free(backup);

     return ret;
}

static int
backup_remove(const char *file_name)
{
     char *backup;

     backup = backup_filename_alloc(file_name);
     unlink(backup);
     free(backup);

     return 0;
}

static int
backup_modified_conffiles(pkg_t *pkg, pkg_t *old_pkg)
{
     int err;
     conffile_list_elt_t *iter;
     conffile_t *cf;

     if (conf->noaction) return 0;

     /* Backup all modified conffiles */
     if (old_pkg) {
	  for (iter = nv_pair_list_first(&old_pkg->conffiles); iter; iter = nv_pair_list_next(&old_pkg->conffiles, iter)) {
	       char *cf_name;
	       
	       cf = iter->data;
	       cf_name = root_filename_alloc(cf->name);

	       /* Don't worry if the conffile is just plain gone */
	       if (file_exists(cf_name) && conffile_has_been_modified(cf)) {
		    err = backup_make_backup(cf_name);
		    if (err) {
			 return err;
		    }
	       }
	       free(cf_name);
	  }
     }

     /* Backup all conffiles that were not conffiles in old_pkg */
     for (iter = nv_pair_list_first(&pkg->conffiles); iter; iter = nv_pair_list_next(&pkg->conffiles, iter)) {
	  char *cf_name;
	  cf = (conffile_t *)iter->data;
	  cf_name = root_filename_alloc(cf->name);
	  /* Ignore if this was a conffile in old_pkg as well */
	  if (pkg_get_conffile(old_pkg, cf->name)) {
	       continue;
	  }

	  if (file_exists(cf_name) && (! backup_exists_for(cf_name))) {
	       err = backup_make_backup(cf_name);
	       if (err) {
		    return err;
	       }
	  }
	  free(cf_name);
     }

     return 0;
}

static int
backup_modified_conffiles_unwind(pkg_t *pkg, pkg_t *old_pkg)
{
     conffile_list_elt_t *iter;

     if (old_pkg) {
	  for (iter = nv_pair_list_first(&old_pkg->conffiles); iter; iter = nv_pair_list_next(&old_pkg->conffiles, iter)) {
	       backup_remove(((nv_pair_t *)iter->data)->name);
	  }
     }

     for (iter = nv_pair_list_first(&pkg->conffiles); iter; iter = nv_pair_list_next(&pkg->conffiles, iter)) {
	  backup_remove(((nv_pair_t *)iter->data)->name);
     }

     return 0;
}


static int
check_data_file_clashes(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY:
	opkg takes a slightly different approach than dpkg at this
	point.  dpkg installs each file in the new package while
	creating a backup for any file that is replaced, (so that it
	can unwind if necessary).  To avoid complexity and redundant
	storage, opkg doesn't do any installation until later, (at the
	point at which dpkg removes the backups.
	
	But, we do have to check for data file clashes, since after
	installing a package with a file clash, removing either of the
	packages involved in the clash has the potential to break the
	other package.
     */
     str_list_t *files_list;
     str_list_elt_t *iter, *niter;

     int clashes = 0;

     files_list = pkg_get_installed_files(pkg);
     if (files_list == NULL)
	     return -1;

     for (iter = str_list_first(files_list), niter = str_list_next(files_list, iter); 
             iter; 
             iter = niter, niter = str_list_next(files_list, iter)) {
	  char *root_filename;
	  char *filename = (char *) iter->data;
	  root_filename = root_filename_alloc(filename);
	  if (file_exists(root_filename) && (! file_is_dir(root_filename))) {
	       pkg_t *owner;
	       pkg_t *obs;

	       if (backup_exists_for(root_filename)) {
		    continue;
	       }

	       /* Pre-existing files are OK if force-overwrite was asserted. */ 
	       if (conf->force_overwrite) {
		    /* but we need to change who owns this file */
		    file_hash_set_file_owner(filename, pkg);
		    continue;
	       }

	       owner = file_hash_get_file_owner(filename);

	       /* Pre-existing files are OK if owned by the pkg being upgraded. */
	       if (owner && old_pkg) {
		    if (strcmp(owner->name, old_pkg->name) == 0) {
			 continue;
		    }
	       }

	       /* Pre-existing files are OK if owned by a package replaced by new pkg. */
	       if (owner) {
                    opkg_msg(DEBUG2, "Checking replaces for %s in package %s\n",
				filename, owner->name);
		    if (pkg_replaces(pkg, owner)) {
			 continue;
		    }
/* If the file that would be installed is owned by the same package, ( as per a reinstall or similar )
   then it's ok to overwrite. */
                    if (strcmp(owner->name,pkg->name)==0){
			 opkg_msg(INFO, "Replacing pre-existing file %s"
					" owned by package %s\n",
					filename, owner->name);
			 continue;
                    }
	       }

	       /* Pre-existing files are OK if they are obsolete */
	       obs = hash_table_get(&conf->obs_file_hash, filename);
	       if (obs) {
		    opkg_msg(INFO, "Pre-exiting file %s is obsolete."
				   " obs_pkg=%s\n",
				    filename, obs->name);
		    continue;
	       }

	       /* We have found a clash. */
	       opkg_msg(ERROR, "Package %s wants to install file %s\n"
			    "\tBut that file is already provided by package ",
			    pkg->name, filename);
	       if (owner) {
		    opkg_msg(ERROR, "%s\n", owner->name);
	       } else {
		    opkg_msg(ERROR, "<no package>\n"
			"Please move this file out of the way and try again.\n");
	       }
	       clashes++;
	  }
	  free(root_filename);
     }
     pkg_free_installed_files(pkg);

     return clashes;
}

/*
 * XXX: This function sucks, as does the below comment.
 */
static int
check_data_file_clashes_change(pkg_t *pkg, pkg_t *old_pkg)
{
    /* Basically that's the worst hack I could do to be able to change ownership of
       file list, but, being that we have no way to unwind the mods, due to structure
       of hash table, probably is the quickest hack too, whishing it would not slow-up thing too much.
       What we do here is change the ownership of file in hash if a replace ( or similar events
       happens )
       Only the action that are needed to change name should be considered.
       @@@ To change after 1.0 release.
     */
     str_list_t *files_list;
     str_list_elt_t *iter, *niter;

     char *root_filename = NULL;

     files_list = pkg_get_installed_files(pkg);
     if (files_list == NULL)
	     return -1;

     for (iter = str_list_first(files_list), niter = str_list_next(files_list, iter); 
             iter; 
             iter = niter, niter = str_list_next(files_list, niter)) {
	  char *filename = (char *) iter->data;
          if (root_filename) {
              free(root_filename);
              root_filename = NULL;
          }
	  root_filename = root_filename_alloc(filename);
	  if (file_exists(root_filename) && (! file_is_dir(root_filename))) {
	       pkg_t *owner;

	       owner = file_hash_get_file_owner(filename);

	       if (conf->force_overwrite) {
		    /* but we need to change who owns this file */
		    file_hash_set_file_owner(filename, pkg);
		    continue;
	       }


	       /* Pre-existing files are OK if owned by a package replaced by new pkg. */
	       if (owner) {
		    if (pkg_replaces(pkg, owner)) {
/* It's now time to change the owner of that file. 
   It has been "replaced" from the new "Replaces", then I need to inform lists file about that.  */
			 opkg_msg(INFO, "Replacing pre-existing file %s "
					 "owned by package %s\n",
					 filename, owner->name);
		         file_hash_set_file_owner(filename, pkg);
			 continue;
		    }
	       }

	  }
     }
     if (root_filename) {
         free(root_filename);
         root_filename = NULL;
     }
     pkg_free_installed_files(pkg);

     return 0;
}

static int
check_data_file_clashes_unwind(pkg_t *pkg, pkg_t *old_pkg)
{
     /* Nothing to do since check_data_file_clashes doesn't change state */
     return 0;
}

static int
postrm_upgrade_old_pkg(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY: dpkg does the following here, should we?
	1. If the package is being upgraded, call
	   old-postrm upgrade new-version
	2. If this fails, attempt:
	   new-postrm failed-upgrade old-version
	Error unwind, for both cases:
	   old-preinst abort-upgrade new-version    */
     return 0;
}

static int
postrm_upgrade_old_pkg_unwind(pkg_t *pkg, pkg_t *old_pkg)
{
     /* DPKG_INCOMPATIBILITY:
	dpkg does some things here that we don't do yet. Do we care?
	(See postrm_upgrade_old_pkg for details)
     */
    return 0;
}

static int
remove_obsolesced_files(pkg_t *pkg, pkg_t *old_pkg)
{
     int err;
     str_list_t *old_files;
     str_list_elt_t *of;
     str_list_t *new_files;
     str_list_elt_t *nf;
     hash_table_t new_files_table;

     old_files = pkg_get_installed_files(old_pkg);
     if (old_files == NULL)
	  return -1;

     new_files = pkg_get_installed_files(pkg);
     if (new_files == NULL) {
          pkg_free_installed_files(old_pkg);
	  return -1;
     }

     new_files_table.entries = NULL;
     hash_table_init("new_files" , &new_files_table, 20);
     for (nf = str_list_first(new_files); nf; nf = str_list_next(new_files, nf)) {
         if (nf && nf->data)
            hash_table_insert(&new_files_table, nf->data, nf->data);
     }

     for (of = str_list_first(old_files); of; of = str_list_next(old_files, of)) {
	  pkg_t *owner;
	  char *old, *new;
	  old = (char *)of->data;
          new = (char *) hash_table_get (&new_files_table, old);
          if (new)
               continue;

	  if (file_is_dir(old)) {
	       continue;
	  }
	  owner = file_hash_get_file_owner(old);
	  if (owner != old_pkg) {
	       /* in case obsolete file no longer belongs to old_pkg */
	       continue;
	  }
 
	  /* old file is obsolete */
	  opkg_msg(INFO, "Removing obsolete file %s.\n", old);
	  if (!conf->noaction) {
	       err = unlink(old);
	       if (err) {
		    opkg_perror(ERROR, "unlinking %s failed", old);
	       }
	  }
     }

     hash_table_deinit(&new_files_table);
     pkg_free_installed_files(old_pkg);
     pkg_free_installed_files(pkg);

     return 0;
}

static int
install_maintainer_scripts(pkg_t *pkg, pkg_t *old_pkg)
{
     int ret;
     char *prefix;

     sprintf_alloc(&prefix, "%s.", pkg->name);
     ret = pkg_extract_control_files_to_dir_with_prefix(pkg,
							pkg->dest->info_dir,
							prefix);
     free(prefix);
     return ret;
}

static int
remove_disappeared(pkg_t *pkg)
{
     /* DPKG_INCOMPATIBILITY:
	This is a fairly sophisticated dpkg operation. Shall we
	skip it? */
     
     /* Any packages all of whose files have been overwritten during the
	installation, and which aren't required for dependencies, are
	considered to have been removed. For each such package
	1. disappearer's-postrm disappear overwriter overwriter-version
	2. The package's maintainer scripts are removed
	3. It is noted in the status database as being in a sane state,
           namely not installed (any conffiles it may have are ignored,
	   rather than being removed by dpkg). Note that disappearing
	   packages do not have their prerm called, because dpkg doesn't
	   know in advance that the package is going to vanish.
     */
     return 0;
}

static int
install_data_files(pkg_t *pkg)
{
     int err;

     /* opkg takes a slightly different approach to data file backups
	than dpkg. Rather than removing backups at this point, we
	actually do the data file installation now. See comments in
	check_data_file_clashes() for more details. */
    
     opkg_msg(INFO, "Extracting data files to %s.\n", pkg->dest->root_dir);
     err = pkg_extract_data_files_to_dir(pkg, pkg->dest->root_dir);
     if (err) {
	  return err;
     }

     /* The "Essential" control field may only be present in the control
      * file and not in the Packages list. Ensure we capture it regardless.
      *
      * XXX: This should be fixed outside of opkg, in the Package list.
      */
     set_flags_from_control(pkg) ;
     
     opkg_msg(DEBUG, "Calling pkg_write_filelist.\n");
     err = pkg_write_filelist(pkg);
     if (err)
	  return err;

     /* XXX: FEATURE: opkg should identify any files which existed
	before installation and which were overwritten, (see
	check_data_file_clashes()). What it must do is remove any such
	files from the filelist of the old package which provided the
	file. Otherwise, if the old package were removed at some point
	it would break the new package. Removing the new package will
	also break the old one, but this cannot be helped since the old
	package's file has already been deleted. This is the importance
	of check_data_file_clashes(), and only allowing opkg to install
	a clashing package with a user force. */

     return 0;
}

static int
resolve_conffiles(pkg_t *pkg)
{
     conffile_list_elt_t *iter;
     conffile_t *cf;
     char *cf_backup;
     char *md5sum;

     if (conf->noaction) return 0;

     for (iter = nv_pair_list_first(&pkg->conffiles); iter; iter = nv_pair_list_next(&pkg->conffiles, iter)) {
	  char *root_filename;
	  cf = (conffile_t *)iter->data;
	  root_filename = root_filename_alloc(cf->name);

	  /* Might need to initialize the md5sum for each conffile */
	  if (cf->value == NULL) {
	       cf->value = file_md5sum_alloc(root_filename);
	  }

	  if (!file_exists(root_filename)) {
	       free(root_filename);
	       continue;
	  }

	  cf_backup = backup_filename_alloc(root_filename);

          if (file_exists(cf_backup)) {
              /* Let's compute md5 to test if files are changed */
              md5sum = file_md5sum_alloc(cf_backup);
              if (md5sum && cf->value && strcmp(cf->value,md5sum) != 0 ) {
                  if (conf->force_maintainer) {
                      opkg_msg(NOTICE, "Conffile %s using maintainer's setting.\n",
				      cf_backup);
                  } else {
                      char *new_conffile;
                      sprintf_alloc(&new_conffile, "%s-opkg", root_filename);
                      opkg_msg(NOTICE, "Existing conffile %s "
                           "is different from the conffile in the new package."
                           " The new conffile will be placed at %s.\n",
                           root_filename, new_conffile);
                      rename(root_filename, new_conffile);
                      rename(cf_backup, root_filename);
                      free(new_conffile);
		  }
              }
              unlink(cf_backup);
	      if (md5sum)
                  free(md5sum);
          }

	  free(cf_backup);
	  free(root_filename);
     }

     return 0;
}


int
opkg_install_by_name(const char *pkg_name)
{
     int cmp;
     pkg_t *old, *new;
     char *old_version, *new_version;

     old = pkg_hash_fetch_installed_by_name(pkg_name);
     if (old)
        opkg_msg(DEBUG2, "Old versions from pkg_hash_fetch %s.\n",
			old->version);
    
     new = pkg_hash_fetch_best_installation_candidate_by_name(pkg_name);
     if (new == NULL)
	return -1;

     opkg_msg(DEBUG2, "Versions from pkg_hash_fetch:");
     if ( old ) 
        opkg_msg(DEBUG2, " old %s ", old->version);
     opkg_msg(DEBUG2, " new %s\n", new->version);

     new->state_flag |= SF_USER;
     if (old) {
	  old_version = pkg_version_str_alloc(old);
	  new_version = pkg_version_str_alloc(new);

	  cmp = pkg_compare_versions(old, new);
          if ( (conf->force_downgrade==1) && (cmp > 0) ){     /* We've been asked to allow downgrade  and version is precedent */
	     opkg_msg(DEBUG, "Forcing downgrade\n");
             cmp = -1 ;                                       /* then we force opkg to downgrade */ 
                                                              /* We need to use a value < 0 because in the 0 case we are asking to */
                                                              /* reinstall, and some check could fail asking the "force-reinstall" option */
          } 
	  opkg_msg(DEBUG, "Comparing visible versions of pkg %s:"
		       "\n\t%s is installed "
		       "\n\t%s is available "
		       "\n\t%d was comparison result\n",
		       pkg_name, old_version, new_version, cmp);
	  if (cmp == 0 && !conf->force_reinstall) {
	       opkg_msg(NOTICE,
			    "Package %s (%s) installed in %s is up to date.\n",
			    old->name, old_version, old->dest->name);
	       free(old_version);
	       free(new_version);
	       return 0;
	  } else if (cmp > 0) {
	       opkg_msg(NOTICE,
			    "Not downgrading package %s on %s from %s to %s.\n",
			    old->name, old->dest->name, old_version, new_version);
	       free(old_version);
	       free(new_version);
	       return 0;
	  } else if (cmp < 0) {
	       new->dest = old->dest;
	       old->state_want = SW_DEINSTALL;    /* Here probably the problem for bug 1277 */
	  }
	  free(old_version);
	  free(new_version);
     }

     opkg_msg(DEBUG2,"Calling opkg_install_pkg.\n");
     return opkg_install_pkg(new, 0);
}

/**
 *  @brief Really install a pkg_t 
 */
int
opkg_install_pkg(pkg_t *pkg, int from_upgrade)
{
     int err = 0;
     int message = 0;
     pkg_t *old_pkg = NULL;
     pkg_vec_t *replacees;
     abstract_pkg_t *ab_pkg = NULL;
     int old_state_flag;
     char* file_md5;
#ifdef HAVE_SHA256
     char* file_sha256;
#endif
     sigset_t newset, oldset;

     if ( from_upgrade ) 
        message = 1;            /* Coming from an upgrade, and should change the output message */

     opkg_msg(DEBUG2, "Calling pkg_arch_supported.\n");

     if (!pkg_arch_supported(pkg)) {
	  opkg_msg(ERROR, "INTERNAL ERROR: architecture %s for pkg %s is unsupported.\n",
		       pkg->architecture, pkg->name);
	  return -1;
     }
     if (pkg->state_status == SS_INSTALLED && conf->force_reinstall == 0 && conf->nodeps == 0) {
	  err = satisfy_dependencies_for(pkg);
	  if (err)
		  return -1;

	  opkg_msg(NOTICE, "Package %s is already installed on %s.\n", 
		       pkg->name, pkg->dest->name);
	  return 0;
     }

     if (pkg->dest == NULL) {
	  pkg->dest = conf->default_dest;
     }

     old_pkg = pkg_hash_fetch_installed_by_name(pkg->name);

     err = opkg_install_check_downgrade(pkg, old_pkg, message);
     if (err)
	     return -1;

     pkg->state_want = SW_INSTALL;
     if (old_pkg){                          
         old_pkg->state_want = SW_DEINSTALL; /* needed for check_data_file_clashes of dependences */
     }

     err = check_conflicts_for(pkg);
     if (err)
	     return -1;
    
     /* this setup is to remove the upgrade scenario in the end when
	installing pkg A, A deps B & B deps on A. So both B and A are
	installed. Then A's installation is started resulting in an
	uncecessary upgrade */ 
     if (pkg->state_status == SS_INSTALLED && conf->force_reinstall == 0)
	     return 0;
    
     err = verify_pkg_installable(pkg);
     if (err)
	     return -1;

     if (pkg->local_filename == NULL) {
         if(!conf->cache && conf->download_only){
             char cwd[4096];
             if(getcwd(cwd, sizeof(cwd)) != NULL)
                err = opkg_download_pkg(pkg, cwd);
             else
                return -1;
         } else {
             err = opkg_download_pkg(pkg, conf->tmp_dir);
         }
	  if (err) {
	       opkg_msg(ERROR, "Failed to download %s. "
			       "Perhaps you need to run 'opkg update'?\n",
			    pkg->name);
	       return -1;
	  }
     }

     /* check that the repository is valid */
     #if defined(HAVE_GPGME) || defined(HAVE_OPENSSL)
     char *list_file_name, *sig_file_name, *lists_dir;

     /* check to ensure the package has come from a repository */
     if (conf->check_signature && pkg->src)
     {
       sprintf_alloc (&lists_dir, "%s",
                     (conf->restrict_to_default_dest)
                      ? conf->default_dest->lists_dir
                      : conf->lists_dir);
       sprintf_alloc (&list_file_name, "%s/%s", lists_dir, pkg->src->name);
       sprintf_alloc (&sig_file_name, "%s/%s.sig", lists_dir, pkg->src->name);

       if (file_exists (sig_file_name))
       {
         if (opkg_verify_file (list_file_name, sig_file_name)){
           opkg_msg(ERROR, "Failed to verify the signature of %s.\n",
                           list_file_name);
           return -1;
         }
       }else{
         opkg_msg(ERROR, "Signature file is missing for %s. "
                         "Perhaps you need to run 'opkg update'?\n",
			 pkg->name);
         return -1;
       }

       free (lists_dir);
       free (list_file_name);
       free (sig_file_name);
     }
     #endif

     /* Check for md5 values */
     if (pkg->md5sum)
     {
         file_md5 = file_md5sum_alloc(pkg->local_filename);
         if (file_md5 && strcmp(file_md5, pkg->md5sum))
         {
              opkg_msg(ERROR, "Package %s md5sum mismatch. "
			"Either the opkg or the package index are corrupt. "
			"Try 'opkg update'.\n",
			pkg->name);
              free(file_md5);
              return -1;
         }
	 if (file_md5)
              free(file_md5);
     }

#ifdef HAVE_SHA256
     /* Check for sha256 value */
     if(pkg->sha256sum)
     {
         file_sha256 = file_sha256sum_alloc(pkg->local_filename);
         if (file_sha256 && strcmp(file_sha256, pkg->sha256sum))
         {
              opkg_msg(ERROR, "Package %s sha256sum mismatch. "
			"Either the opkg or the package index are corrupt. "
			"Try 'opkg update'.\n",
			pkg->name);
              free(file_sha256);
              return -1;
         }
	 if (file_sha256)
              free(file_sha256);
     }
#endif
     if(conf->download_only) {
         if (conf->nodeps == 0) {
             err = satisfy_dependencies_for(pkg);
             if (err)
                 return -1;
         }
         return 0;
     }

     if (pkg->tmp_unpack_dir == NULL) {
	  if (unpack_pkg_control_files(pkg) == -1) {
	       opkg_msg(ERROR, "Failed to unpack control files from %s.\n",
			       pkg->local_filename);
	       return -1;
	  }
     }

     err = update_file_ownership(pkg, old_pkg);
     if (err)
	     return -1;

     if (conf->nodeps == 0) {
	  err = satisfy_dependencies_for(pkg);
	  if (err)
		return -1;
          if (pkg->state_status == SS_UNPACKED)
               /* Circular dependency has installed it for us. */
		return 0;
     }

     replacees = pkg_vec_alloc();
     pkg_get_installed_replacees(pkg, replacees);

     /* this next section we do with SIGINT blocked to prevent inconsistency between opkg database and filesystem */

	  sigemptyset(&newset);
	  sigaddset(&newset, SIGINT);
	  sigprocmask(SIG_BLOCK, &newset, &oldset);

	  opkg_state_changed++;
	  pkg->state_flag |= SF_FILELIST_CHANGED;

	  if (old_pkg)
               pkg_remove_orphan_dependent(pkg, old_pkg);

	  /* XXX: BUG: we really should treat replacement more like an upgrade
	   *      Instead, we're going to remove the replacees 
	   */
	  err = pkg_remove_installed_replacees(replacees);
	  if (err)
		  goto UNWIND_REMOVE_INSTALLED_REPLACEES;

	  err = prerm_upgrade_old_pkg(pkg, old_pkg);
	  if (err)
		  goto UNWIND_PRERM_UPGRADE_OLD_PKG;

	  err = prerm_deconfigure_conflictors(pkg, replacees);
	  if (err)
		  goto UNWIND_PRERM_DECONFIGURE_CONFLICTORS;

	  err = preinst_configure(pkg, old_pkg);
	  if (err)
		  goto UNWIND_PREINST_CONFIGURE;

	  err = backup_modified_conffiles(pkg, old_pkg);
	  if (err)
		  goto UNWIND_BACKUP_MODIFIED_CONFFILES;

	  err = check_data_file_clashes(pkg, old_pkg);
	  if (err)
		  goto UNWIND_CHECK_DATA_FILE_CLASHES;

	  err = postrm_upgrade_old_pkg(pkg, old_pkg);
	  if (err)
		  goto UNWIND_POSTRM_UPGRADE_OLD_PKG;

	  if (conf->noaction)
		  return 0;

	  /* point of no return: no unwinding after this */
	  if (old_pkg && !conf->force_reinstall) {
	       old_pkg->state_want = SW_DEINSTALL;

	       if (old_pkg->state_flag & SF_NOPRUNE) {
		    opkg_msg(INFO, "Not removing obsolesced files because "
				    "package %s marked noprune.\n",
				    old_pkg->name);
	       } else {
		    opkg_msg(INFO, "Removing obsolesced files for %s\n",
				    old_pkg->name);
		    if (remove_obsolesced_files(pkg, old_pkg)) {
			opkg_msg(ERROR, "Failed to determine "
					"obsolete files from previously "
					"installed %s\n", old_pkg->name);
		    }
	       }

               /* removing files from old package, to avoid ghost files */ 
               remove_data_files_and_list(old_pkg);
               remove_maintainer_scripts(old_pkg);
	  }


	  opkg_msg(INFO, "Installing maintainer scripts.\n");
	  if (install_maintainer_scripts(pkg, old_pkg)) {
		opkg_msg(ERROR, "Failed to extract maintainer scripts for %s."
			       " Package debris may remain!\n",
			       pkg->name);
		goto pkg_is_hosed;
	  }

	  /* the following just returns 0 */
	  remove_disappeared(pkg);

	  opkg_msg(INFO, "Installing data files for %s.\n", pkg->name);

	  if (install_data_files(pkg)) {
		opkg_msg(ERROR, "Failed to extract data files for %s. "
				"Package debris may remain!\n",
			       pkg->name);
		goto pkg_is_hosed;
	  }

	  err = check_data_file_clashes_change(pkg, old_pkg);
	  if (err) {
		opkg_msg(ERROR, "check_data_file_clashes_change() failed for "
			       "for files belonging to %s.\n",
			       pkg->name);
	  }

	  opkg_msg(INFO, "Resolving conf files for %s\n", pkg->name);
	  resolve_conffiles(pkg);

	  pkg->state_status = SS_UNPACKED;
	  old_state_flag = pkg->state_flag;
	  pkg->state_flag &= ~SF_PREFER;
	  opkg_msg(DEBUG, "pkg=%s old_state_flag=%x state_flag=%x\n",
			  pkg->name, old_state_flag, pkg->state_flag);

	  if (old_pkg && !conf->force_reinstall) {
	       old_pkg->state_status = SS_NOT_INSTALLED;
	  }

	  time(&pkg->installed_time);

	  ab_pkg = pkg->parent;
	  if (ab_pkg)
	       ab_pkg->state_status = pkg->state_status;

	  sigprocmask(SIG_UNBLOCK, &newset, &oldset);
          pkg_vec_free (replacees);
	  return 0;
     

     UNWIND_POSTRM_UPGRADE_OLD_PKG:
	  postrm_upgrade_old_pkg_unwind(pkg, old_pkg);
     UNWIND_CHECK_DATA_FILE_CLASHES:
	  check_data_file_clashes_unwind(pkg, old_pkg);
     UNWIND_BACKUP_MODIFIED_CONFFILES:
	  backup_modified_conffiles_unwind(pkg, old_pkg);
     UNWIND_PREINST_CONFIGURE:
	  preinst_configure_unwind(pkg, old_pkg);
     UNWIND_PRERM_DECONFIGURE_CONFLICTORS:
	  prerm_deconfigure_conflictors_unwind(pkg, replacees);
     UNWIND_PRERM_UPGRADE_OLD_PKG:
	  prerm_upgrade_old_pkg_unwind(pkg, old_pkg);
     UNWIND_REMOVE_INSTALLED_REPLACEES:
	  pkg_remove_installed_replacees_unwind(replacees);

pkg_is_hosed:
	  sigprocmask(SIG_UNBLOCK, &newset, &oldset);

          pkg_vec_free (replacees);
	  return -1;
}