Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/lib/libalpm/conflict.c
blob: a9e7a963b59a24dfb7834a5a1f0c7e8d308f65b8 (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
/*
 *  conflict.c
 * 
 *  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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef CYGWIN
#include <limits.h> /* PATH_MAX */
#endif
#include <sys/stat.h>
/* pacman */
#include "util.h"
#include "log.h"
#include "cache.h"
#include "deps.h"
#include "conflict.h"

/* Returns a PMList* of missing_t pointers.
 *
 * conflicts are always name only
 */
PMList *checkconflicts(pmdb_t *db, PMList *packages)
{
	pmpkg_t *info = NULL;
	PMList *i, *j, *k;
	PMList *baddeps = NULL;
	pmdepmissing_t *miss = NULL;

	if(db == NULL) {
		return(NULL);
	}

	for(i = packages; i; i = i->next) {
		pmpkg_t *tp = i->data;
		if(tp == NULL) {
			continue;
		}

		for(j = tp->conflicts; j; j = j->next) {
			if(!strcmp(tp->name, j->data)) {
				/* a package cannot conflict with itself -- that's just not nice */
				continue;
			}
			/* CHECK 1: check targets against database */
			for(k = db_get_pkgcache(db); k; k = k->next) {
				pmpkg_t *dp = (pmpkg_t *)k->data;
				if(!strcmp(dp->name, tp->name)) {
					/* a package cannot conflict with itself -- that's just not nice */
					continue;
				}
				if(!strcmp(j->data, dp->name)) {
					/* conflict */
					MALLOC(miss, sizeof(pmdepmissing_t));
					miss->type = PM_DEP_TYPE_CONFLICT;
					miss->depend.mod = PM_DEP_MOD_ANY;
					miss->depend.version[0] = '\0';
					STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
					STRNCPY(miss->depend.name, dp->name, PKG_NAME_LEN);
					if(!pm_list_is_in(miss, baddeps)) {
						_alpm_log(PM_LOG_DEBUG, "checkdeps: targs vs db: adding %s as a conflict for %s",
						          dp->name, tp->name);
						baddeps = pm_list_add(baddeps, miss);
					} else {
						FREE(miss);
					}
				} else {
					/* see if dp provides something in tp's conflict list */
					PMList *m;
					for(m = dp->provides; m; m = m->next) {
						if(!strcmp(m->data, j->data)) {
							/* confict */
							MALLOC(miss, sizeof(pmdepmissing_t));
							miss->type = PM_DEP_TYPE_CONFLICT;
							miss->depend.mod = PM_DEP_MOD_ANY;
							miss->depend.version[0] = '\0';
							STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
							STRNCPY(miss->depend.name, dp->name, PKG_NAME_LEN);
							if(!pm_list_is_in(miss, baddeps)) {
								_alpm_log(PM_LOG_DEBUG, "checkdeps: targs vs db: adding %s as a conflict for %s",
								          dp->name, tp->name);
								baddeps = pm_list_add(baddeps, miss);
							} else {
								FREE(miss);
							}
						}
					}
				}
			}
			/* CHECK 2: check targets against targets */
			for(k = packages; k; k = k->next) {
				pmpkg_t *otp = (pmpkg_t *)k->data;
				if(!strcmp(otp->name, tp->name)) {
					/* a package cannot conflict with itself -- that's just not nice */
					continue;
				}
				if(!strcmp(otp->name, (char *)j->data)) {
					/* otp is listed in tp's conflict list */
					MALLOC(miss, sizeof(pmdepmissing_t));
					miss->type = PM_DEP_TYPE_CONFLICT;
					miss->depend.mod = PM_DEP_MOD_ANY;
					miss->depend.version[0] = '\0';
					STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
					STRNCPY(miss->depend.name, otp->name, PKG_NAME_LEN);
					if(!pm_list_is_in(miss, baddeps)) {
						_alpm_log(PM_LOG_DEBUG, "checkdeps: targs vs targs: adding %s as a conflict for %s",
						          otp->name, tp->name);
						baddeps = pm_list_add(baddeps, miss);
					} else {
						FREE(miss);
					}
				} else {
					/* see if otp provides something in tp's conflict list */ 
					PMList *m;
					for(m = otp->provides; m; m = m->next) {
						if(!strcmp(m->data, j->data)) {
							MALLOC(miss, sizeof(pmdepmissing_t));
							miss->type = PM_DEP_TYPE_CONFLICT;
							miss->depend.mod = PM_DEP_MOD_ANY;
							miss->depend.version[0] = '\0';
							STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
							STRNCPY(miss->depend.name, otp->name, PKG_NAME_LEN);
							if(!pm_list_is_in(miss, baddeps)) {
								_alpm_log(PM_LOG_DEBUG, "checkdeps: targs vs targs: adding %s as a conflict for %s",
								          otp->name, tp->name);
								baddeps = pm_list_add(baddeps, miss);
							} else {
								FREE(miss);
							}
						}
					}
				}
			}
		}
		/* CHECK 3: check database against targets */
		for(k = db_get_pkgcache(db); k; k = k->next) {
			info = k->data;
			if(!strcmp(info->name, tp->name)) {
				/* a package cannot conflict with itself -- that's just not nice */
				continue;
			}
			for(j = info->conflicts; j; j = j->next) {
				if(!strcmp((char *)j->data, tp->name)) {
					MALLOC(miss, sizeof(pmdepmissing_t));
					miss->type = PM_DEP_TYPE_CONFLICT;
					miss->depend.mod = PM_DEP_MOD_ANY;
					miss->depend.version[0] = '\0';
					STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
					STRNCPY(miss->depend.name, info->name, PKG_NAME_LEN);
					if(!pm_list_is_in(miss, baddeps)) {
						_alpm_log(PM_LOG_DEBUG, "checkdeps: db vs targs: adding %s as a conflict for %s",
						          info->name, tp->name);
						baddeps = pm_list_add(baddeps, miss);
					} else {
						FREE(miss);
					}
				} else {
					/* see if the db package conflicts with something we provide */
					PMList *m;
					for(m = info->conflicts; m; m = m->next) {
						PMList *n;
						for(n = tp->provides; n; n = n->next) {
							if(!strcmp(m->data, n->data)) {
								MALLOC(miss, sizeof(pmdepmissing_t));
								miss->type = PM_DEP_TYPE_CONFLICT;
								miss->depend.mod = PM_DEP_MOD_ANY;
								miss->depend.version[0] = '\0';
								STRNCPY(miss->target, tp->name, PKG_NAME_LEN);
								STRNCPY(miss->depend.name, info->name, PKG_NAME_LEN);
								if(!pm_list_is_in(miss, baddeps)) {
									_alpm_log(PM_LOG_DEBUG, "checkdeps: db vs targs: adding %s as a conflict for %s",
									          info->name, tp->name);
									baddeps = pm_list_add(baddeps, miss);
								} else {
									FREE(miss);
								}
							}
						}
					}
				}
			}
		}
	}

	return(baddeps);
}

PMList *db_find_conflicts(pmdb_t *db, PMList *targets, char *root, PMList **skip_list)
{
	PMList *i, *j, *k;
	char *filestr = NULL;
	char path[PATH_MAX+1];
	char *str = NULL;
	struct stat buf, buf2;
	PMList *conflicts = NULL;

	if(db == NULL || targets == NULL || root == NULL) {
		return(NULL);
	}

	/* CHECK 1: check every target against every target */
	for(i = targets; i; i = i->next) {
		pmpkg_t *p1 = (pmpkg_t*)i->data;
		for(j = i; j; j = j->next) {
			pmpkg_t *p2 = (pmpkg_t*)j->data;
			if(strcmp(p1->name, p2->name)) {
				for(k = p1->files; k; k = k->next) {
					filestr = k->data;
					if(!strcmp(filestr, "._install") || !strcmp(filestr, ".INSTALL")) {
						continue;
					}
					if(rindex(filestr, '/') == filestr+strlen(filestr)-1) {
						/* this filename has a trailing '/', so it's a directory -- skip it. */
						continue;
					}
					if(pm_list_is_strin(filestr, p2->files)) {
						MALLOC(str, 512);
						snprintf(str, 512, "%s: exists in \"%s\" (target) and \"%s\" (target)",
							filestr, p1->name, p2->name);
						conflicts = pm_list_add(conflicts, str);
					}
				}
			}
		}
	}

	/* CHECK 2: check every target against the filesystem */
	for(i = targets; i; i = i->next) {
		pmpkg_t *p = (pmpkg_t*)i->data;
		pmpkg_t *dbpkg = NULL;
		for(j = p->files; j; j = j->next) {
			int isdir = 0;
			filestr = (char*)j->data;
			snprintf(path, PATH_MAX, "%s%s", root, filestr);
			/* is this target a file or directory? */
			if(path[strlen(path)-1] == '/') {
				isdir = 1;
				path[strlen(path)-1] = '\0';
			}
			if(!lstat(path, &buf)) {
				int ok = 0;
				if(!S_ISLNK(buf.st_mode) && ((isdir && !S_ISDIR(buf.st_mode)) || (!isdir && S_ISDIR(buf.st_mode)))) {
					/* if the package target is a directory, and the filesystem target
					 * is not (or vice versa) then it's a conflict
					 */
					ok = 0;
					goto donecheck;
				}
				/* re-fetch with stat() instead of lstat() */
				stat(path, &buf);
				if(S_ISDIR(buf.st_mode)) {
					/* if it's a directory, then we have no conflict */
					ok = 1;
				} else {
					if(dbpkg == NULL) {
						dbpkg = db_scan(db, p->name, INFRQ_DESC | INFRQ_FILES);
					}
					if(dbpkg && pm_list_is_strin(j->data, dbpkg->files)) {
						ok = 1;
					}
					/* Make sure that the supposedly-conflicting file is not actually just
					 * a symlink that points to a path that used to exist in the package.
					 */
					/* Check if any part of the conflicting file's path is a symlink */
					if(dbpkg && !ok) {
						char str[PATH_MAX];
						for(k = dbpkg->files; k; k = k->next) {
							snprintf(str, PATH_MAX, "%s%s", root, (char*)k->data);
							stat(str, &buf2);
							if(buf.st_ino == buf2.st_ino) {
								ok = 1;
							}
						}
					}
					/* Check if the conflicting file has been moved to another package/target */
					if(!ok) {
						/* Look at all the targets */
						for(k = targets; k && !ok; k = k->next) {
							pmpkg_t *p1 = (pmpkg_t *)k->data;
							/* As long as they're not the current package */
							if(strcmp(p1->name, p->name)) {
								pmpkg_t *dbpkg2 = NULL;
								dbpkg2 = db_scan(db, p1->name, INFRQ_DESC | INFRQ_FILES);
								/* If it used to exist in there, but doesn't anymore */
								if(dbpkg2 && !pm_list_is_strin(filestr, p1->files) && pm_list_is_strin(filestr, dbpkg2->files)) {
									ok = 1;
									/* Add to the "skip list" of files that we shouldn't remove during an upgrade.
									 *
									 * This is a workaround for the following scenario:
									 *
									 *    - the old package A provides file X
									 *    - the new package A does not
									 *    - the new package B provides file X
									 *    - package A depends on B, so B is upgraded first
									 *
									 * Package B is upgraded, so file X is installed.  Then package A
									 * is upgraded, and it *removes* file X, since it no longer exists
									 * in package A.
									 *
									 * Our workaround is to scan through all "old" packages and all "new"
									 * ones, looking for files that jump to different packages.
									 */
									*skip_list = pm_list_add(*skip_list, strdup(filestr));
								}
								FREEPKG(dbpkg2);
							}
						}
					}
				}
donecheck:
				if(!ok) {
					MALLOC(str, 512);
					snprintf(str, 512, "%s: %s: exists in filesystem", p->name, path);
					conflicts = pm_list_add(conflicts, str);
				}
			}
		}
		FREEPKG(dbpkg);
	}

	return(conflicts);
}

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