1 /* $NetBSD: conflicts.c,v 1.1.1.4 2010/01/30 21:33:43 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Roland Illig <rillig@NetBSD.org>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * XXX: Reading the +CONTENTS files of all installed packages is
34 * rather slow. Since this check is necessary to avoid conflicting
35 * packages, it should not be removed.
36 *
37 * TODO: Put all the information that is currently in the +CONTENTS
38 * files into one large file or another database.
39 */
40
41 #if HAVE_CONFIG_H
42 #include "config.h"
43 #endif
44
45 #include <nbcompat.h>
46
47 #if HAVE_SYS_CDEFS_H
48 #include <sys/cdefs.h>
49 #endif
50
51 __RCSID("$NetBSD: conflicts.c,v 1.1.1.4 2010/01/30 21:33:43 joerg Exp $");
52
53 #if HAVE_ERR_H
54 #include <err.h>
55 #endif
56
57 #include "dewey.h"
58 #include "lib.h"
59
60 /**
61 * Data structure to keep the intermediate result of the conflict
62 * search. ''pkgname'' is the package in question. The first
63 * installed package that conflicts is filled into
64 * ''conflicting_pkgname''. The pattern that leads to the conflict is
65 * also filled in to help the user in deciding what to do with the
66 * conflict.
67 */
68 struct package_conflict {
69 const char *pkgname;
70 const char *skip_pkgname;
71 char **conflicting_pkgname;
72 char **conflicting_pattern;
73 };
74
75 static FILE *
fopen_contents(const char * pkgname,const char * mode)76 fopen_contents(const char *pkgname, const char *mode)
77 {
78 char *fname;
79 FILE *f;
80
81 fname = pkgdb_pkg_file(pkgname, CONTENTS_FNAME);
82 f = fopen(fname, mode);
83 if (f == NULL) {
84 err(EXIT_FAILURE, "%s", fname);
85 /* NOTREACHED */
86 }
87 free(fname);
88 return f;
89 }
90
91
92 static int
check_package_conflict(const char * pkgname,void * v)93 check_package_conflict(const char *pkgname, void *v)
94 {
95 struct package_conflict *conflict = v;
96 package_t pkg;
97 plist_t *p;
98 FILE *f;
99 int rv;
100
101 if (conflict->skip_pkgname != NULL &&
102 strcmp(conflict->skip_pkgname, pkgname) == 0)
103 return 0;
104
105 rv = 0;
106
107 f = fopen_contents(pkgname, "r");
108 read_plist(&pkg, f);
109 (void)fclose(f);
110
111 for (p = pkg.head; p; p = p->next) {
112 if (p->type != PLIST_PKGCFL)
113 continue;
114
115 if (pkg_match(p->name, conflict->pkgname) == 1) {
116 *(conflict->conflicting_pkgname) = xstrdup(pkgname);
117 *(conflict->conflicting_pattern) = xstrdup(p->name);
118 rv = 1 /* nonzero, stop iterating */;
119 break;
120 }
121 }
122
123 free_plist(&pkg);
124 return rv;
125 }
126
127 /**
128 * Checks if some installed package has a pkgcfl entry that matches
129 * PkgName. If such an entry is found, the package name is returned in
130 * inst_pkgname, the matching pattern in inst_pattern, and the function
131 * returns a non-zero value. Otherwise, zero is returned and the result
132 * variables are set to NULL.
133 */
134 int
some_installed_package_conflicts_with(const char * pkgname,const char * skip_pkgname,char ** inst_pkgname,char ** inst_pattern)135 some_installed_package_conflicts_with(const char *pkgname,
136 const char *skip_pkgname, char **inst_pkgname, char **inst_pattern)
137 {
138 struct package_conflict cfl;
139 int rv;
140
141 cfl.pkgname = pkgname;
142 cfl.skip_pkgname = skip_pkgname;
143 *inst_pkgname = NULL;
144 *inst_pattern = NULL;
145 cfl.conflicting_pkgname = inst_pkgname;
146 cfl.conflicting_pattern = inst_pattern;
147 rv = iterate_pkg_db(check_package_conflict, &cfl);
148 if (rv == -1) {
149 errx(EXIT_FAILURE, "Couldn't read list of installed packages.");
150 /* NOTREACHED */
151 }
152 return *inst_pkgname != NULL;
153 }
154
155 #if 0
156 int main(int argc, char **argv)
157 {
158 char *pkg, *patt;
159
160 if (some_installed_package_conflicts_with(argv[1], &pkg, &patt))
161 printf("yes: package %s conflicts with %s, pattern %s\n", pkg, argv[1], patt);
162 else
163 printf("no\n");
164 return 0;
165 }
166 #endif
167