transaction_check_replaces.c

/*-
 * Copyright (c) 2011-2020 Juan Romero Pardines.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <libgen.h>
 
#include "xbps_api_impl.h"
 
/*
 * Processes the array of pkg dictionaries in "pkgs" to
 * find matching package replacements via "replaces" pkg obj.
 *
 * This array contains the unordered list of packages in
 * the transaction dictionary.
 */
bool HIDDEN
xbps_transaction_check_replaces(struct xbps_handle *xhp, xbps_array_t pkgs)
{
        assert(xhp);
        assert(pkgs);
 
        for (unsigned int i = 0; i < xbps_array_count(pkgs); i++) {
                xbps_array_t replaces;
                xbps_object_t obj, obj2;
                xbps_object_iterator_t iter;
                xbps_dictionary_t instd, reppkgd;
                const char *pkgver = NULL;
                char pkgname[XBPS_NAME_SIZE] = {0};
 
                obj = xbps_array_get(pkgs, i);
                replaces = xbps_dictionary_get(obj, "replaces");
                if (replaces == NULL || xbps_array_count(replaces) == 0)
                        continue;
 
                if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver)) {
                        return false;
                }
                if (!xbps_pkg_name(pkgname, XBPS_NAME_SIZE, pkgver)) {
                        return false;
                }
 
                iter = xbps_array_iterator(replaces);
                assert(iter);
 
                while ((obj2 = xbps_object_iterator_next(iter)) != NULL) {
                        const char *curpkgver = NULL, *pattern = NULL;
                        char curpkgname[XBPS_NAME_SIZE] = {0};
                        bool instd_auto = false, hold = false;
                        xbps_trans_type_t ttype;
 
                        pattern = xbps_string_cstring_nocopy(obj2);
                        /*
                         * Find the installed package that matches the pattern
                         * to be replaced.
                         */
                        if (((instd = xbps_pkgdb_get_pkg(xhp, pattern)) == NULL) &&
                            ((instd = xbps_pkgdb_get_virtualpkg(xhp, pattern)) == NULL))
                                continue;
 
                        if (!xbps_dictionary_get_cstring_nocopy(instd, "pkgver", &curpkgver)) {
                                xbps_object_iterator_release(iter);
                                return false;
                        }
                        /* ignore pkgs on hold mode */
                        if (xbps_dictionary_get_bool(instd, "hold", &hold) && hold)
                                continue;
 
                        if (!xbps_pkg_name(curpkgname, XBPS_NAME_SIZE, curpkgver)) {
                                xbps_object_iterator_release(iter);
                                return false;
                        }
                        /*
                         * Check that we are not replacing the same package,
                         * due to virtual packages.
                         */
                        if (strcmp(pkgname, curpkgname) == 0) {
                                continue;
                        }
                        /*
                         * Make sure to not add duplicates.
                         */
                        xbps_dictionary_get_bool(instd, "automatic-install", &instd_auto);
                        reppkgd = xbps_find_pkg_in_array(pkgs, curpkgname, 0);
                        if (reppkgd) {
                                ttype = xbps_transaction_pkg_type(reppkgd);
                                if (ttype == XBPS_TRANS_REMOVE || ttype == XBPS_TRANS_HOLD)
                                        continue;
                                if (!xbps_dictionary_get_cstring_nocopy(reppkgd,
                                    "pkgver", &curpkgver)) {
                                        xbps_object_iterator_release(iter);
                                        return false;
                                }
                                if (!xbps_match_virtual_pkg_in_dict(reppkgd, pattern) &&
                                    !xbps_pkgpattern_match(curpkgver, pattern))
                                        continue;
                                /*
                                 * Package contains replaces="pkgpattern", but the
                                 * package that should be replaced is also in the
                                 * transaction and it's going to be updated.
                                 */
                                if (!instd_auto) {
                                        xbps_dictionary_remove(obj, "automatic-install");
                                }
                                if (!xbps_dictionary_set_bool(reppkgd, "replaced", true)) {
                                        xbps_object_iterator_release(iter);
                                        return false;
                                }
                                if (!xbps_transaction_pkg_type_set(reppkgd, XBPS_TRANS_REMOVE)) {
                                        xbps_object_iterator_release(iter);
                                        return false;
                                }
                                if (xbps_array_replace_dict_by_name(pkgs, reppkgd, curpkgname) != 0) {
                                        xbps_object_iterator_release(iter);
                                        return false;
                                }
                                xbps_dbg_printf(
                                    "Package `%s' in transaction will be "
                                    "replaced by `%s', matched with `%s'\n",
                                    curpkgver, pkgver, pattern);
                                continue;
                        }
                        /*
                         * If new package is providing a virtual package to the
                         * package that we want to replace we should respect
                         * the automatic-install object.
                         */
                        if (xbps_match_virtual_pkg_in_dict(obj, pattern)) {
                                if (!instd_auto) {
                                        xbps_dictionary_remove(obj, "automatic-install");
                                }
                        }
                        /*
                         * Add package dictionary into the transaction and mark
                         * it as to be "removed".
                         */
                        if (!xbps_transaction_pkg_type_set(instd, XBPS_TRANS_REMOVE)) {
                                xbps_object_iterator_release(iter);
                                return false;
                        }
                        if (!xbps_dictionary_set_bool(instd, "replaced", true)) {
                                xbps_object_iterator_release(iter);
                                return false;
                        }
                        if (!xbps_array_add_first(pkgs, instd)) {
                                xbps_object_iterator_release(iter);
                                return false;
                        }
                        xbps_dbg_printf(
                            "Package `%s' will be replaced by `%s', "
                            "matched with `%s'\n", curpkgver, pkgver, pattern);
                }
                xbps_object_iterator_release(iter);
        }
 
        return true;
}