167 lines
4.5 KiB
C
167 lines
4.5 KiB
C
/* $NetBSD: conflicts.c,v 1.1.1.4 2010/01/30 21:33:43 joerg Exp $ */
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/*-
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* Copyright (c) 2007 Roland Illig <rillig@NetBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* XXX: Reading the +CONTENTS files of all installed packages is
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* rather slow. Since this check is necessary to avoid conflicting
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* packages, it should not be removed.
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*
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* TODO: Put all the information that is currently in the +CONTENTS
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* files into one large file or another database.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <nbcompat.h>
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#if HAVE_SYS_CDEFS_H
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#include <sys/cdefs.h>
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#endif
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__RCSID("$NetBSD: conflicts.c,v 1.1.1.4 2010/01/30 21:33:43 joerg Exp $");
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#if HAVE_ERR_H
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#include <err.h>
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#endif
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#include "dewey.h"
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#include "lib.h"
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/**
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* Data structure to keep the intermediate result of the conflict
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* search. ''pkgname'' is the package in question. The first
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* installed package that conflicts is filled into
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* ''conflicting_pkgname''. The pattern that leads to the conflict is
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* also filled in to help the user in deciding what to do with the
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* conflict.
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*/
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struct package_conflict {
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const char *pkgname;
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const char *skip_pkgname;
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char **conflicting_pkgname;
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char **conflicting_pattern;
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};
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static FILE *
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fopen_contents(const char *pkgname, const char *mode)
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{
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char *fname;
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FILE *f;
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fname = pkgdb_pkg_file(pkgname, CONTENTS_FNAME);
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f = fopen(fname, mode);
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if (f == NULL) {
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err(EXIT_FAILURE, "%s", fname);
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/* NOTREACHED */
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}
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free(fname);
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return f;
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}
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static int
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check_package_conflict(const char *pkgname, void *v)
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{
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struct package_conflict *conflict = v;
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package_t pkg;
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plist_t *p;
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FILE *f;
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int rv;
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if (conflict->skip_pkgname != NULL &&
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strcmp(conflict->skip_pkgname, pkgname) == 0)
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return 0;
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rv = 0;
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f = fopen_contents(pkgname, "r");
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read_plist(&pkg, f);
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(void)fclose(f);
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for (p = pkg.head; p; p = p->next) {
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if (p->type != PLIST_PKGCFL)
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continue;
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if (pkg_match(p->name, conflict->pkgname) == 1) {
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*(conflict->conflicting_pkgname) = xstrdup(pkgname);
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*(conflict->conflicting_pattern) = xstrdup(p->name);
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rv = 1 /* nonzero, stop iterating */;
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break;
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}
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}
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free_plist(&pkg);
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return rv;
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}
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/**
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* Checks if some installed package has a pkgcfl entry that matches
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* PkgName. If such an entry is found, the package name is returned in
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* inst_pkgname, the matching pattern in inst_pattern, and the function
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* returns a non-zero value. Otherwise, zero is returned and the result
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* variables are set to NULL.
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*/
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int
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some_installed_package_conflicts_with(const char *pkgname,
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const char *skip_pkgname, char **inst_pkgname, char **inst_pattern)
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{
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struct package_conflict cfl;
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int rv;
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cfl.pkgname = pkgname;
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cfl.skip_pkgname = skip_pkgname;
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*inst_pkgname = NULL;
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*inst_pattern = NULL;
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cfl.conflicting_pkgname = inst_pkgname;
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cfl.conflicting_pattern = inst_pattern;
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rv = iterate_pkg_db(check_package_conflict, &cfl);
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if (rv == -1) {
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errx(EXIT_FAILURE, "Couldn't read list of installed packages.");
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/* NOTREACHED */
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}
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return *inst_pkgname != NULL;
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}
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#if 0
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int main(int argc, char **argv)
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{
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char *pkg, *patt;
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if (some_installed_package_conflicts_with(argv[1], &pkg, &patt))
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printf("yes: package %s conflicts with %s, pattern %s\n", pkg, argv[1], patt);
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else
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printf("no\n");
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return 0;
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}
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#endif
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