summaryrefslogtreecommitdiff
path: root/lib/libalpm/remove.c
blob: 0642e04a3bc3bbb525dcb58c1b824443e5b0dfa6 (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
/*
 *  remove.c
 *
 *  Copyright (c) 2006-2013 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
 *  Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
 *  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 <stdlib.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <dirent.h>
#include <regex.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

/* libalpm */
#include "remove.h"
#include "alpm_list.h"
#include "alpm.h"
#include "trans.h"
#include "util.h"
#include "log.h"
#include "backup.h"
#include "package.h"
#include "db.h"
#include "deps.h"
#include "handle.h"
#include "filelist.h"

/**
 * @brief Add a package removal action to the transaction.
 *
 * @param handle the context handle
 * @param pkg the package to uninstall
 *
 * @return 0 on success, -1 on error
 */
int SYMEXPORT alpm_remove_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg)
{
	const char *pkgname;
	alpm_trans_t *trans;
	alpm_pkg_t *copy;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);
	ASSERT(pkg != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));
	ASSERT(handle == pkg->handle, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));
	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_INITIALIZED,
			RET_ERR(handle, ALPM_ERR_TRANS_NOT_INITIALIZED, -1));

	pkgname = pkg->name;

	if(alpm_pkg_find(trans->remove, pkgname)) {
		RET_ERR(handle, ALPM_ERR_TRANS_DUP_TARGET, -1);
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s to the transaction remove list\n",
			pkgname);
	if(_alpm_pkg_dup(pkg, &copy) == -1) {
		return -1;
	}
	trans->remove = alpm_list_add(trans->remove, copy);
	return 0;
}

/**
 * @brief Add dependencies to the removal transaction for cascading.
 *
 * @param handle the context handle
 * @param lp list of missing dependencies caused by the removal transaction
 *
 * @return 0 on success, -1 on error
 */
static int remove_prepare_cascade(alpm_handle_t *handle, alpm_list_t *lp)
{
	alpm_trans_t *trans = handle->trans;

	while(lp) {
		alpm_list_t *i;
		for(i = lp; i; i = i->next) {
			alpm_depmissing_t *miss = i->data;
			alpm_pkg_t *info = _alpm_db_get_pkgfromcache(handle->db_local, miss->target);
			if(info) {
				alpm_pkg_t *copy;
				if(!alpm_pkg_find(trans->remove, info->name)) {
					_alpm_log(handle, ALPM_LOG_DEBUG, "pulling %s in target list\n",
							info->name);
					if(_alpm_pkg_dup(info, &copy) == -1) {
						return -1;
					}
					trans->remove = alpm_list_add(trans->remove, copy);
				}
			} else {
				_alpm_log(handle, ALPM_LOG_ERROR,
						_("could not find %s in database -- skipping\n"), miss->target);
			}
		}
		alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
		alpm_list_free(lp);
		lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local),
				trans->remove, NULL, 1);
	}
	return 0;
}

/**
 * @brief Remove needed packages from the removal transaction.
 *
 * @param handle the context handle
 * @param lp list of missing dependencies caused by the removal transaction
 */
static void remove_prepare_keep_needed(alpm_handle_t *handle, alpm_list_t *lp)
{
	alpm_trans_t *trans = handle->trans;

	/* Remove needed packages (which break dependencies) from target list */
	while(lp != NULL) {
		alpm_list_t *i;
		for(i = lp; i; i = i->next) {
			alpm_depmissing_t *miss = i->data;
			void *vpkg;
			alpm_pkg_t *pkg = alpm_pkg_find(trans->remove, miss->causingpkg);
			if(pkg == NULL) {
				continue;
			}
			trans->remove = alpm_list_remove(trans->remove, pkg, _alpm_pkg_cmp,
					&vpkg);
			pkg = vpkg;
			if(pkg) {
				_alpm_log(handle, ALPM_LOG_WARNING, _("removing %s from target list\n"),
						pkg->name);
				_alpm_pkg_free(pkg);
			}
		}
		alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
		alpm_list_free(lp);
		lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local),
				trans->remove, NULL, 1);
	}
}

/**
 * @brief Send a callback for any optdepend being removed.
 *
 * @param handle the context handle
 * @param lp list of packages to be removed
 */
static void remove_notify_needed_optdepends(alpm_handle_t *handle, alpm_list_t *lp)
{
	alpm_list_t *i;

	for(i = _alpm_db_get_pkgcache(handle->db_local); i; i = alpm_list_next(i)) {
		alpm_pkg_t *pkg = i->data;
		alpm_list_t *optdeps = alpm_pkg_get_optdepends(pkg);

		if(optdeps && !alpm_pkg_find(lp, pkg->name)) {
			alpm_list_t *j;
			for(j = optdeps; j; j = alpm_list_next(j)) {
				alpm_depend_t *optdep = j->data;
				if(alpm_pkg_find(lp, optdep->name)) {
					EVENT(handle, ALPM_EVENT_OPTDEP_REQUIRED, pkg, optdep);
				}
			}
		}
	}
}

/**
 * @brief Transaction preparation for remove actions.
 *
 * This functions takes a pointer to a alpm_list_t which will be
 * filled with a list of alpm_depmissing_t* objects representing
 * the packages blocking the transaction.
 *
 * @param handle the context handle
 * @param data a pointer to an alpm_list_t* to fill
 *
 * @return 0 on success, -1 on error
 */
int _alpm_remove_prepare(alpm_handle_t *handle, alpm_list_t **data)
{
	alpm_list_t *lp;
	alpm_trans_t *trans = handle->trans;
	alpm_db_t *db = handle->db_local;

	if((trans->flags & ALPM_TRANS_FLAG_RECURSE)
			&& !(trans->flags & ALPM_TRANS_FLAG_CASCADE)) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n");
		if(_alpm_recursedeps(db, trans->remove,
				trans->flags & ALPM_TRANS_FLAG_RECURSEALL)) {
			return -1;
		}
	}

	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
		EVENT(handle, ALPM_EVENT_CHECKDEPS_START, NULL, NULL);

		_alpm_log(handle, ALPM_LOG_DEBUG, "looking for unsatisfied dependencies\n");
		lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(db), trans->remove, NULL, 1);
		if(lp != NULL) {

			if(trans->flags & ALPM_TRANS_FLAG_CASCADE) {
				if(remove_prepare_cascade(handle, lp)) {
					return -1;
				}
			} else if(trans->flags & ALPM_TRANS_FLAG_UNNEEDED) {
				/* Remove needed packages (which would break dependencies)
				 * from target list */
				remove_prepare_keep_needed(handle, lp);
			} else {
				if(data) {
					*data = lp;
				} else {
					alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
					alpm_list_free(lp);
				}
				RET_ERR(handle, ALPM_ERR_UNSATISFIED_DEPS, -1);
			}
		}
	}

	/* re-order w.r.t. dependencies */
	_alpm_log(handle, ALPM_LOG_DEBUG, "sorting by dependencies\n");
	lp = _alpm_sortbydeps(handle, trans->remove, 1);
	/* free the old alltargs */
	alpm_list_free(trans->remove);
	trans->remove = lp;

	/* -Rcs == -Rc then -Rs */
	if((trans->flags & ALPM_TRANS_FLAG_CASCADE)
			&& (trans->flags & ALPM_TRANS_FLAG_RECURSE)) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n");
		if(_alpm_recursedeps(db, trans->remove,
					trans->flags & ALPM_TRANS_FLAG_RECURSEALL)) {
			return -1;
		}
	}

	/* Note packages being removed that are optdepends for installed packages */
	remove_notify_needed_optdepends(handle, trans->remove);

	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
		EVENT(handle, ALPM_EVENT_CHECKDEPS_DONE, NULL, NULL);
	}

	return 0;
}

static int dir_is_mountpoint(alpm_handle_t *handle, const char *directory,
		const struct stat *stbuf)
{
	char parent_dir[PATH_MAX];
	struct stat parent_stbuf;
	dev_t dir_st_dev;

	if(stbuf == NULL) {
		struct stat dir_stbuf;
		if(stat(directory, &dir_stbuf) < 0) {
			_alpm_log(handle, ALPM_LOG_DEBUG,
					"failed to stat directory %s: %s",
					directory, strerror(errno));
			return 0;
		}
		dir_st_dev = dir_stbuf.st_dev;
	} else {
		dir_st_dev = stbuf->st_dev;
	}

	snprintf(parent_dir, PATH_MAX, "%s..", directory);
	if(stat(parent_dir, &parent_stbuf) < 0) {
		_alpm_log(handle, ALPM_LOG_DEBUG,
				"failed to stat parent of %s: %s: %s",
				directory, parent_dir, strerror(errno));
		return 0;
	}

	return dir_st_dev != parent_stbuf.st_dev;
}

/**
 * @brief Check if alpm can delete a file.
 *
 * @param handle the context handle
 * @param file file to be removed
 * @param skip_remove list of files that will not be removed
 *
 * @return 1 if the file can be deleted, 0 if it cannot be deleted
 */
static int can_remove_file(alpm_handle_t *handle, const alpm_file_t *file,
		alpm_list_t *skip_remove)
{
	char filepath[PATH_MAX];

	if(alpm_list_find(skip_remove, file->name, _alpm_fnmatch)) {
		/* return success because we will never actually remove this file */
		return 1;
	}

	if(file->name[strlen(file->name) - 1] == '/' &&
			dir_is_mountpoint(handle, file->name, NULL)) {
		/* we do not remove mountpoints */
		return 1;
	}

	snprintf(filepath, PATH_MAX, "%s%s", handle->root, file->name);
	/* If we fail write permissions due to a read-only filesystem, abort.
	 * Assume all other possible failures are covered somewhere else */
	if(_alpm_access(handle, NULL, filepath, W_OK) == -1) {
		if(errno != EACCES && errno != ETXTBSY && access(filepath, F_OK) == 0) {
			/* only return failure if the file ACTUALLY exists and we can't write to
			 * it - ignore "chmod -w" simple permission failures */
			_alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove file '%s': %s\n"),
					filepath, strerror(errno));
			return 0;
		}
	}

	return 1;
}

static void shift_pacsave(alpm_handle_t *handle, const char *file)
{
	DIR *dir = NULL;
	struct dirent *ent;
	struct stat st;
	regex_t reg;

	const char *basename;
	char *dirname;
	char oldfile[PATH_MAX];
	char newfile[PATH_MAX];
	char regstr[PATH_MAX];

	unsigned long log_max = 0;
	size_t basename_len;

	dirname = mdirname(file);
	if(!dirname) {
		return;
	}

	basename = mbasename(file);
	basename_len = strlen(basename);

	snprintf(regstr, PATH_MAX, "^%s\\.pacsave\\.([[:digit:]]+)$", basename);
	if(regcomp(&reg, regstr, REG_EXTENDED | REG_NEWLINE) != 0) {
		goto cleanup;
	}

	dir = opendir(dirname);
	if(dir == NULL) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("could not open directory: %s: %s\n"),
							dirname, strerror(errno));
		goto cleanup;
	}

	while((ent = readdir(dir)) != NULL) {
		if(strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) {
			continue;
		}

		if(regexec(&reg, ent->d_name, 0, 0, 0) == 0) {
			unsigned long cur_log;
			cur_log = strtoul(ent->d_name + basename_len + strlen(".pacsave."), NULL, 10);
			if(cur_log > log_max) {
				log_max = cur_log;
			}
		}
	}

	/* Shift pacsaves */
	unsigned long i;
	for(i = log_max + 1; i > 1; i--) {
		snprintf(oldfile, PATH_MAX, "%s.pacsave.%lu", file, i-1);
		snprintf(newfile, PATH_MAX, "%s.pacsave.%lu", file, i);
		rename(oldfile, newfile);
	}

	snprintf(oldfile, PATH_MAX, "%s.pacsave", file);
	if(stat(oldfile, &st) == 0) {
		snprintf(newfile, PATH_MAX, "%s.1", oldfile);
		rename(oldfile, newfile);
	}

	regfree(&reg);

cleanup:
	free(dirname);
	closedir(dir);
}


/**
 * @brief Unlink a package file, backing it up if necessary.
 *
 * @param handle the context handle
 * @param oldpkg the package being removed
 * @param newpkg the package replacing \a oldpkg
 * @param fileobj file to remove
 * @param skip_remove list of files that shouldn't be removed
 * @param nosave whether files should be backed up
 *
 * @return 0 on success, -1 if there was an error unlinking the file, 1 if the
 * file was skipped or did not exist
 */
static int unlink_file(alpm_handle_t *handle, alpm_pkg_t *oldpkg,
		alpm_pkg_t *newpkg, const alpm_file_t *fileobj, alpm_list_t *skip_remove,
		int nosave)
{
	struct stat buf;
	char file[PATH_MAX];

	snprintf(file, PATH_MAX, "%s%s", handle->root, fileobj->name);

	/* check the remove skip list before removing the file.
	 * see the big comment block in db_find_fileconflicts() for an
	 * explanation. */
	if(alpm_list_find(skip_remove, fileobj->name, _alpm_fnmatch)) {
		_alpm_log(handle, ALPM_LOG_DEBUG,
				"%s is in skip_remove, skipping removal\n", file);
		return 1;
	}

	/* we want to do a lstat here, and not a _alpm_lstat.
	 * if a directory in the package is actually a directory symlink on the
	 * filesystem, we want to work with the linked directory instead of the
	 * actual symlink */
	if(lstat(file, &buf)) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "file %s does not exist\n", file);
		return 1;
	}

	if(S_ISDIR(buf.st_mode)) {
		ssize_t files = _alpm_files_in_directory(handle, file, 0);
		/* if we have files, no need to remove the directory */
		if(files > 0) {
			_alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (contains files)\n",
					file);
		} else if(files < 0) {
			_alpm_log(handle, ALPM_LOG_DEBUG,
					"keeping directory %s (could not count files)\n", file);
		} else if(newpkg && alpm_filelist_contains(alpm_pkg_get_files(newpkg),
					fileobj->name)) {
			/* newpkg's filelist should have already been resolved by the caller */
			_alpm_log(handle, ALPM_LOG_DEBUG,
					"keeping directory %s (in new package)\n", file);
		} else if(dir_is_mountpoint(handle, file, &buf)) {
			_alpm_log(handle, ALPM_LOG_DEBUG,
					"keeping directory %s (mountpoint)\n", file);
		} else {
			/* one last check- does any other package own this file? */
			alpm_list_t *local, *local_pkgs;
			int found = 0;
			local_pkgs = _alpm_db_get_pkgcache(handle->db_local);
			for(local = local_pkgs; local && !found; local = local->next) {
				alpm_pkg_t *local_pkg = local->data;
				alpm_filelist_t *filelist;

				/* we duplicated the package when we put it in the removal list, so we
				 * so we can't use direct pointer comparison here. */
				if(oldpkg->name_hash == local_pkg->name_hash
						&& strcmp(oldpkg->name, local_pkg->name) == 0) {
					continue;
				}
				filelist = alpm_pkg_get_files(local_pkg);
				/* This is too slow and only covers a rare case
				   Disable for now... */
				/* _alpm_filelist_resolve(handle, filelist); */
				if(alpm_filelist_contains(filelist, fileobj->name)) {
					_alpm_log(handle, ALPM_LOG_DEBUG,
							"keeping directory %s (owned by %s)\n", file, local_pkg->name);
					found = 1;
				}
			}
			if(!found) {
				if(rmdir(file)) {
					_alpm_log(handle, ALPM_LOG_DEBUG,
							"directory removal of %s failed: %s\n", file, strerror(errno));
					return -1;
				} else {
					_alpm_log(handle, ALPM_LOG_DEBUG,
							"removed directory %s (no remaining owners)\n", file);
				}
			}
		}
	} else {
		/* if the file needs backup and has been modified, back it up to .pacsave */
		alpm_backup_t *backup = _alpm_needbackup(fileobj->name, oldpkg);
		if(backup) {
			if(nosave) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "transaction is set to NOSAVE, not backing up '%s'\n", file);
			} else {
				char *filehash = alpm_compute_md5sum(file);
				int cmp = filehash ? strcmp(filehash, backup->hash) : 0;
				FREE(filehash);
				if(cmp != 0) {
					char *newpath;
					size_t len = strlen(file) + 8 + 1;
					MALLOC(newpath, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
					shift_pacsave(handle, file);
					snprintf(newpath, len, "%s.pacsave", file);
					if(rename(file, newpath)) {
						_alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"),
								file, newpath, strerror(errno));
						alpm_logaction(handle, ALPM_CALLER_PREFIX,
								"error: could not rename %s to %s (%s)\n",
								file, newpath, strerror(errno));
						free(newpath);
						return -1;
					}
					_alpm_log(handle, ALPM_LOG_WARNING, _("%s saved as %s\n"), file, newpath);
					alpm_logaction(handle, ALPM_CALLER_PREFIX,
							"warning: %s saved as %s\n", file, newpath);
					free(newpath);
					return 0;
				}
			}
		}

		_alpm_log(handle, ALPM_LOG_DEBUG, "unlinking %s\n", file);

		if(unlink(file) == -1) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove %s (%s)\n"),
					file, strerror(errno));
			alpm_logaction(handle, ALPM_CALLER_PREFIX,
					"error: cannot remove %s (%s)\n", file, strerror(errno));
			return -1;
		}
	}
	return 0;
}

/**
 * @brief Remove a package's files, optionally skipping its replacement's
 * files.
 *
 * @param handle the context handle
 * @param oldpkg package to remove
 * @param newpkg package to replace \a oldpkg (optional)
 * @param targ_count current index within the transaction (1-based)
 * @param pkg_count the number of packages affected by the transaction
 *
 * @return 0 on success, -1 if alpm lacks permission to delete some of the
 * files, >0 the number of files alpm was unable to delete
 */
static int remove_package_files(alpm_handle_t *handle,
		alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg,
		size_t targ_count, size_t pkg_count)
{
	alpm_list_t *skip_remove;
	alpm_filelist_t *filelist;
	size_t i;
	int err = 0;
	int nosave = handle->trans->flags & ALPM_TRANS_FLAG_NOSAVE;

	if(newpkg) {
		alpm_filelist_t *newfiles;
		alpm_list_t *b;
		skip_remove = alpm_list_join(
				alpm_list_strdup(handle->trans->skip_remove),
				alpm_list_strdup(handle->noupgrade));
		/* Add files in the NEW backup array to the skip_remove array
		 * so this removal operation doesn't kill them */
		/* old package backup list */
		newfiles = alpm_pkg_get_files(newpkg);
		_alpm_filelist_resolve(handle, newfiles);
		for(b = alpm_pkg_get_backup(newpkg); b; b = b->next) {
			const alpm_backup_t *backup = b->data;
			/* safety check (fix the upgrade026 pactest) */
			if(!alpm_filelist_contains(newfiles, backup->name)) {
				continue;
			}
			_alpm_log(handle, ALPM_LOG_DEBUG, "adding %s to the skip_remove array\n",
					backup->name);
			skip_remove = alpm_list_add(skip_remove, strdup(backup->name));
		}
	} else {
		skip_remove = alpm_list_strdup(handle->trans->skip_remove);
	}

	filelist = alpm_pkg_get_files(oldpkg);
	for(i = 0; i < filelist->count; i++) {
		alpm_file_t *file = filelist->files + i;
		if(!can_remove_file(handle, file, skip_remove)) {
			_alpm_log(handle, ALPM_LOG_DEBUG,
					"not removing package '%s', can't remove all files\n",
					oldpkg->name);
			FREELIST(skip_remove);
			RET_ERR(handle, ALPM_ERR_PKG_CANT_REMOVE, -1);
		}
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "removing %zd files\n", filelist->count);

	if(!newpkg) {
		/* init progress bar, but only on true remove transactions */
		PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name, 0,
				pkg_count, targ_count);
	}

	/* iterate through the list backwards, unlinking files */
	for(i = filelist->count; i > 0; i--) {
		alpm_file_t *file = filelist->files + i - 1;
		if(unlink_file(handle, oldpkg, newpkg, file, skip_remove, nosave) < 0) {
			err++;
		}

		if(!newpkg) {
			/* update progress bar after each file */
			int percent = ((filelist->count - i) * 100) / filelist->count;
			PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name,
					percent, pkg_count, targ_count);
		}
	}
	FREELIST(skip_remove);

	if(!newpkg) {
		/* set progress to 100% after we finish unlinking files */
		PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name, 100,
				pkg_count, targ_count);
	}

	return err;
}

/**
 * @brief Remove a package from the filesystem.
 *
 * @param handle the context handle
 * @param oldpkg package to remove
 * @param newpkg package to replace \a oldpkg (optional)
 * @param targ_count current index within the transaction (1-based)
 * @param pkg_count the number of packages affected by the transaction
 *
 * @return 0
 */
int _alpm_remove_single_package(alpm_handle_t *handle,
		alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg,
		size_t targ_count, size_t pkg_count)
{
	const char *pkgname = oldpkg->name;
	const char *pkgver = oldpkg->version;

	if(newpkg) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "removing old package first (%s-%s)\n",
				pkgname, pkgver);
	} else {
		EVENT(handle, ALPM_EVENT_REMOVE_START, oldpkg, NULL);
		_alpm_log(handle, ALPM_LOG_DEBUG, "removing package %s-%s\n",
				pkgname, pkgver);

		/* run the pre-remove scriptlet if it exists  */
		if(alpm_pkg_has_scriptlet(oldpkg) &&
				!(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) {
			char *scriptlet = _alpm_local_db_pkgpath(handle->db_local,
					oldpkg, "install");
			_alpm_runscriptlet(handle, scriptlet, "pre_remove", pkgver, NULL, 0);
			free(scriptlet);
		}
	}

	if(!(handle->trans->flags & ALPM_TRANS_FLAG_DBONLY)) {
		/* TODO check returned errors if any */
		remove_package_files(handle, oldpkg, newpkg, targ_count, pkg_count);
	}

	/* run the post-remove script if it exists  */
	if(!newpkg && alpm_pkg_has_scriptlet(oldpkg) &&
			!(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) {
		char *scriptlet = _alpm_local_db_pkgpath(handle->db_local,
				oldpkg, "install");
		_alpm_runscriptlet(handle, scriptlet, "post_remove", pkgver, NULL, 0);
		free(scriptlet);
	}

	if(!newpkg) {
		EVENT(handle, ALPM_EVENT_REMOVE_DONE, oldpkg, NULL);
	}

	/* remove the package from the database */
	_alpm_log(handle, ALPM_LOG_DEBUG, "removing database entry '%s'\n", pkgname);
	if(_alpm_local_db_remove(handle->db_local, oldpkg) == -1) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("could not remove database entry %s-%s\n"),
				pkgname, pkgver);
	}
	/* remove the package from the cache */
	if(_alpm_db_remove_pkgfromcache(handle->db_local, oldpkg) == -1) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("could not remove entry '%s' from cache\n"),
				pkgname);
	}

	/* TODO: useful return values */
	return 0;
}

/**
 * @brief Remove packages in the current transaction.
 *
 * @param handle the context handle
 * @param run_ldconfig whether to run ld_config after removing the packages
 *
 * @return 0 on success, -1 if errors occurred while removing files
 */
int _alpm_remove_packages(alpm_handle_t *handle, int run_ldconfig)
{
	alpm_list_t *targ;
	size_t pkg_count, targ_count;
	alpm_trans_t *trans = handle->trans;
	int ret = 0;

	pkg_count = alpm_list_count(trans->remove);
	targ_count = 1;

	for(targ = trans->remove; targ; targ = targ->next) {
		alpm_pkg_t *pkg = targ->data;

		if(trans->state == STATE_INTERRUPTED) {
			return ret;
		}

		if(_alpm_remove_single_package(handle, pkg, NULL,
					targ_count, pkg_count) == -1) {
			handle->pm_errno = ALPM_ERR_TRANS_ABORT;
			/* running ldconfig at this point could possibly screw system */
			run_ldconfig = 0;
			ret = -1;
		}

		targ_count++;
	}

	if(run_ldconfig) {
		/* run ldconfig if it exists */
		_alpm_ldconfig(handle);
	}

	return ret;
}

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