transaction_check_conflicts.c

/*-
 * Copyright (c) 2012-2020 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 "xbps/xbps_array.h"
#include "xbps_api_impl.h"
 
static int
pkg_conflicts_trans(struct xbps_handle *xhp, xbps_array_t array,
                xbps_dictionary_t pkg_repod)
{
        xbps_array_t pkg_cflicts, trans_cflicts;
        xbps_dictionary_t pkgd, tpkgd;
        xbps_trans_type_t ttype;
        const char *repopkgver, *repopkgname;
        char *buf;
 
        assert(xhp);
        assert(array);
        assert(pkg_repod);
 
        pkg_cflicts = xbps_dictionary_get(pkg_repod, "conflicts");
        if (xbps_array_count(pkg_cflicts) == 0)
                return 0;
 
        ttype = xbps_transaction_pkg_type(pkg_repod);
        if (ttype == XBPS_TRANS_HOLD || ttype == XBPS_TRANS_REMOVE)
                return 0;
 
        trans_cflicts = xbps_dictionary_get(xhp->transd, "conflicts");
        if (!xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgver", &repopkgver))
                abort();
        if (!xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgname", &repopkgname))
                abort();
 
        for (unsigned int i = 0; i < xbps_array_count(pkg_cflicts); i++) {
                const char *pkgver = NULL, *pkgname = NULL, *cfpkg = NULL;
 
                if (!xbps_array_get_cstring_nocopy(pkg_cflicts, i, &cfpkg))
                        abort();
 
                /*
                 * Check if current pkg conflicts with an installed package.
                 */
                if ((pkgd = xbps_pkgdb_get_pkg(xhp, cfpkg)) ||
                    (pkgd = xbps_pkgdb_get_virtualpkg(xhp, cfpkg))) {
                        /* If the conflicting pkg is on hold, ignore it */
                        if (xbps_dictionary_get(pkgd, "hold"))
                                continue;
 
                        /* Ignore itself */
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname))
                                abort();
                        if (strcmp(pkgname, repopkgname) == 0) {
                                continue;
                        }
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver))
                                abort();
                        /*
                         * If there's a pkg for the conflict in transaction,
                         * ignore it.
                         */
                        if ((tpkgd = xbps_find_pkg_in_array(array, pkgname, 0))) {
                                ttype = xbps_transaction_pkg_type(tpkgd);
                                if (ttype == XBPS_TRANS_INSTALL ||
                                    ttype == XBPS_TRANS_UPDATE ||
                                    ttype == XBPS_TRANS_REMOVE ||
                                    ttype == XBPS_TRANS_HOLD) {
                                        continue;
                                }
                        }
                        xbps_dbg_printf("found conflicting installed "
                            "pkg %s with pkg in transaction %s "
                            "(matched by %s [trans])\n", pkgver, repopkgver, cfpkg);
                        buf = xbps_xasprintf("CONFLICT: %s with "
                            "installed pkg %s (matched by %s)",
                            repopkgver, pkgver, cfpkg);
                        if (!xbps_array_add_cstring(trans_cflicts, buf))
                                return xbps_error_oom();
                        continue;
                }
                /*
                 * Check if current pkg conflicts with any pkg in transaction.
                 */
                if ((pkgd = xbps_find_pkg_in_array(array, cfpkg, 0)) ||
                    (pkgd = xbps_find_virtualpkg_in_array(xhp, array, cfpkg, 0))) {
                        /* ignore pkgs to be removed or on hold */
                        ttype = xbps_transaction_pkg_type(pkgd);
                        if (ttype == XBPS_TRANS_REMOVE || ttype == XBPS_TRANS_HOLD)
                                continue;
                        /* ignore itself */
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname))
                                abort();
                        if (strcmp(pkgname, repopkgname) == 0)
                                continue;
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver))
                                break;
                        xbps_dbg_printf("found conflicting pkgs in "
                            "transaction %s <-> %s (matched by %s [trans])\n",
                            pkgver, repopkgver, cfpkg);
                        buf = xbps_xasprintf("CONFLICT: %s with "
                           "%s in transaction (matched by %s)",
                           repopkgver, pkgver, cfpkg);
                        if (!buf)
                                return xbps_error_oom();
                        if (!xbps_array_add_cstring_nocopy(trans_cflicts, buf))
                                return xbps_error_oom();
                        continue;
                }
        }
        return 0;
}
 
static int
pkgdb_conflicts_cb(struct xbps_handle *xhp, xbps_object_t obj,
                const char *key UNUSED, void *arg, bool *done UNUSED)
{
        xbps_array_t pkg_cflicts, trans_cflicts, pkgs = arg;
        xbps_dictionary_t pkgd;
        xbps_trans_type_t ttype;
        const char *repopkgver, *repopkgname;
        char *buf;
 
        pkg_cflicts = xbps_dictionary_get(obj, "conflicts");
        if (xbps_array_count(pkg_cflicts) == 0)
                return 0;
 
        if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &repopkgver))
                abort();
        if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgname", &repopkgname))
                abort();
 
        // XXX: this should really be a hashtable/dictionary lookup
        /* if a pkg is in the transaction, ignore the one from pkgdb */
        if (xbps_find_pkg_in_array(pkgs, repopkgname, 0))
                return 0;
 
        trans_cflicts = xbps_dictionary_get(xhp->transd, "conflicts");
 
        for (unsigned int i = 0; i < xbps_array_count(pkg_cflicts); i++) {
                const char *pkgver = NULL, *pkgname = NULL, *cfpkg = NULL;
 
                if (!xbps_array_get_cstring_nocopy(pkg_cflicts, i, &cfpkg))
                        abort();
 
                if ((pkgd = xbps_find_pkg_in_array(pkgs, cfpkg, 0)) ||
                    (pkgd = xbps_find_virtualpkg_in_array(xhp, pkgs, cfpkg, 0))) {
                        /* ignore pkgs to be removed or on hold */
                        ttype = xbps_transaction_pkg_type(pkgd);
                        if (ttype == XBPS_TRANS_REMOVE || ttype == XBPS_TRANS_HOLD) {
                                continue;
                        }
                        /* ignore itself */
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname))
                                abort();
                        if (strcmp(pkgname, repopkgname) == 0) {
                                continue;
                        }
                        if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver))
                                abort();
                        xbps_dbg_printf("found conflicting pkgs in "
                            "transaction %s <-> %s (matched by %s [pkgdb])\n",
                            pkgver, repopkgver, cfpkg);
                        buf = xbps_xasprintf("CONFLICT: %s with "
                           "%s in transaction (matched by %s)",
                           repopkgver, pkgver, cfpkg);
                        if (!buf)
                                return xbps_error_oom();
                        if (!xbps_array_add_cstring_nocopy(trans_cflicts, buf))
                                return xbps_error_oom();
                        continue;
                }
        }
        return 0;
}
 
int HIDDEN
xbps_transaction_check_conflicts(struct xbps_handle *xhp, xbps_array_t pkgs)
{
        xbps_array_t array;
        int r;
 
        /* find conflicts in transaction */
        for (unsigned int i = 0; i < xbps_array_count(pkgs); i++) {
                r = pkg_conflicts_trans(xhp, pkgs, xbps_array_get(pkgs, i));
                if (r < 0)
                        return r;
        }
 
        /* find conflicts in pkgdb */
        r = xbps_pkgdb_foreach_cb_multi(xhp, pkgdb_conflicts_cb, pkgs);
        if (r < 0)
                return r;
        else if (r > 0)
                return -r;
 
        array = xbps_dictionary_get(xhp->transd, "conflicts");
        if (xbps_array_count(array) == 0)
                xbps_dictionary_remove(xhp->transd, "conflicts");
 
        return 0;
}