external/bsd/pkg_install/dist/lib/conflicts.c

   1 /*      $NetBSD: conflicts.c,v 1.9 2009/08/02 17:56:45 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 1.9 2009/08/02 17:56:45 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 *
  76 fopen_contents(const char *pkgname, const char *mode)
  77 {
  78         char fname[MaxPathSize];
  79         FILE *f;
  80
  81         snprintf(fname, sizeof(fname), "%s/%s/%s", _pkgdb_getPKGDB_DIR(), pkgname, CONTENTS_FNAME);
  82         f = fopen(fname, mode);
  83         if (f == NULL) {
  84                 err(EXIT_FAILURE, "%s", fname);
  85                 /* NOTREACHED */
  86         }
  87         return f;
  88 }
  89
  90
  91 static int
  92 check_package_conflict(const char *pkgname, void *v)
  93 {
  94         struct package_conflict *conflict = v;
  95         package_t pkg;
  96         plist_t *p;
  97         FILE *f;
  98         int rv;
  99
 100         if (conflict->skip_pkgname != NULL &&
 101             strcmp(conflict->skip_pkgname, pkgname) == 0)
 102                 return 0;
 103
 104         rv = 0;
 105
 106         f = fopen_contents(pkgname, "r");
 107         read_plist(&pkg, f);
 108         (void)fclose(f);
 109
 110         for (p = pkg.head; p; p = p->next) {
 111                 if (p->type != PLIST_PKGCFL)
 112                         continue;
 113
 114                 if (pkg_match(p->name, conflict->pkgname) == 1) {
 115                         *(conflict->conflicting_pkgname) = xstrdup(pkgname);
 116                         *(conflict->conflicting_pattern) = xstrdup(p->name);
 117                         rv = 1 /* nonzero, stop iterating */;
 118                         break;
 119                 }
 120         }
 121
 122         free_plist(&pkg);
 123         return rv;
 124 }
 125
 126 /**
 127  * Checks if some installed package has a pkgcfl entry that matches
 128  * PkgName.  If such an entry is found, the package name is returned in
 129  * inst_pkgname, the matching pattern in inst_pattern, and the function
 130  * returns a non-zero value. Otherwise, zero is returned and the result
 131  * variables are set to NULL.
 132  */
 133 int
 134 some_installed_package_conflicts_with(const char *pkgname,
 135     const char *skip_pkgname, char **inst_pkgname, char **inst_pattern)
 136 {
 137         struct package_conflict cfl;
 138         int rv;
 139
 140         cfl.pkgname = pkgname;
 141         cfl.skip_pkgname = skip_pkgname;
 142         *inst_pkgname = NULL;
 143         *inst_pattern = NULL;
 144         cfl.conflicting_pkgname = inst_pkgname;
 145         cfl.conflicting_pattern = inst_pattern;
 146         rv = iterate_pkg_db(check_package_conflict, &cfl);
 147         if (rv == -1) {
 148                 errx(EXIT_FAILURE, "Couldn't read list of installed packages.");
 149                 /* NOTREACHED */
 150         }
 151         return *inst_pkgname != NULL;
 152 }
 153
 154 #if 0
 155 int main(int argc, char **argv)
 156 {
 157         char *pkg, *patt;
 158
 159         if (some_installed_package_conflicts_with(argv[1], &pkg, &patt))
 160                 printf("yes: package %s conflicts with %s, pattern %s\n", pkg, argv[1], patt);
 161         else
 162                 printf("no\n");
 163         return 0;
 164 }
 165 #endif