mirror of
https://github.com/moparisthebest/pacman
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1dd3405813
Signed-off-by: Allan McRae <allan@archlinux.org>
561 lines
17 KiB
C
561 lines
17 KiB
C
/*
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* conflict.c
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*
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* Copyright (c) 2006-2013 Pacman Development Team <pacman-dev@archlinux.org>
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* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
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* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
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* Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
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* Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
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* Copyright (c) 2006 by Christian Hamar <krics@linuxforum.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <dirent.h>
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/* libalpm */
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#include "conflict.h"
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#include "alpm_list.h"
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#include "alpm.h"
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#include "handle.h"
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#include "trans.h"
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#include "util.h"
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#include "log.h"
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#include "deps.h"
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#include "filelist.h"
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static alpm_conflict_t *conflict_new(alpm_pkg_t *pkg1, alpm_pkg_t *pkg2,
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alpm_depend_t *reason)
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{
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alpm_conflict_t *conflict;
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MALLOC(conflict, sizeof(alpm_conflict_t), return NULL);
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conflict->package1_hash = pkg1->name_hash;
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conflict->package2_hash = pkg2->name_hash;
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STRDUP(conflict->package1, pkg1->name, return NULL);
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STRDUP(conflict->package2, pkg2->name, return NULL);
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conflict->reason = reason;
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return conflict;
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}
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void _alpm_conflict_free(alpm_conflict_t *conflict)
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{
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FREE(conflict->package2);
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FREE(conflict->package1);
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FREE(conflict);
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}
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alpm_conflict_t *_alpm_conflict_dup(const alpm_conflict_t *conflict)
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{
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alpm_conflict_t *newconflict;
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CALLOC(newconflict, 1, sizeof(alpm_conflict_t), return NULL);
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newconflict->package1_hash = conflict->package1_hash;
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newconflict->package2_hash = conflict->package2_hash;
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STRDUP(newconflict->package1, conflict->package1, return NULL);
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STRDUP(newconflict->package2, conflict->package2, return NULL);
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newconflict->reason = conflict->reason;
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return newconflict;
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}
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static int conflict_isin(alpm_conflict_t *needle, alpm_list_t *haystack)
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{
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alpm_list_t *i;
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for(i = haystack; i; i = i->next) {
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alpm_conflict_t *conflict = i->data;
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if(needle->package1_hash == conflict->package1_hash
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&& needle->package2_hash == conflict->package2_hash
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&& strcmp(needle->package1, conflict->package1) == 0
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&& strcmp(needle->package2, conflict->package2) == 0) {
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return 1;
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}
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}
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return 0;
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}
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/** Adds the pkg1/pkg2 conflict to the baddeps list.
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* @param handle the context handle
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* @param baddeps list to add conflict to
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* @param pkg1 first package
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* @param pkg2 package causing conflict
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* @param reason reason for this conflict
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*/
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static int add_conflict(alpm_handle_t *handle, alpm_list_t **baddeps,
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alpm_pkg_t *pkg1, alpm_pkg_t *pkg2, alpm_depend_t *reason)
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{
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alpm_conflict_t *conflict = conflict_new(pkg1, pkg2, reason);
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if(!conflict) {
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return -1;
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}
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if(!conflict_isin(conflict, *baddeps)) {
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char *conflict_str = alpm_dep_compute_string(reason);
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*baddeps = alpm_list_add(*baddeps, conflict);
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_alpm_log(handle, ALPM_LOG_DEBUG, "package %s conflicts with %s (by %s)\n",
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pkg1->name, pkg2->name, conflict_str);
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free(conflict_str);
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} else {
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_alpm_conflict_free(conflict);
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}
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return 0;
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}
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/** Check if packages from list1 conflict with packages from list2.
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* This looks at the conflicts fields of all packages from list1, and sees
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* if they match packages from list2.
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* If a conflict (pkg1, pkg2) is found, it is added to the baddeps list
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* in this order if order >= 0, or reverse order (pkg2,pkg1) otherwise.
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*
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* @param handle the context handle
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* @param list1 first list of packages
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* @param list2 second list of packages
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* @param baddeps list to store conflicts
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* @param order if >= 0 the conflict order is preserved, if < 0 it's reversed
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*/
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static void check_conflict(alpm_handle_t *handle,
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alpm_list_t *list1, alpm_list_t *list2,
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alpm_list_t **baddeps, int order) {
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alpm_list_t *i;
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if(!baddeps) {
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return;
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}
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for(i = list1; i; i = i->next) {
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alpm_pkg_t *pkg1 = i->data;
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alpm_list_t *j;
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for(j = alpm_pkg_get_conflicts(pkg1); j; j = j->next) {
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alpm_depend_t *conflict = j->data;
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alpm_list_t *k;
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for(k = list2; k; k = k->next) {
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alpm_pkg_t *pkg2 = k->data;
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if(pkg1->name_hash == pkg2->name_hash
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&& strcmp(pkg1->name, pkg2->name) == 0) {
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/* skip the package we're currently processing */
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continue;
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}
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if(_alpm_depcmp(pkg2, conflict)) {
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if(order >= 0) {
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add_conflict(handle, baddeps, pkg1, pkg2, conflict);
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} else {
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add_conflict(handle, baddeps, pkg2, pkg1, conflict);
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}
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}
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}
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}
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}
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}
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/* Check for inter-conflicts */
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alpm_list_t *_alpm_innerconflicts(alpm_handle_t *handle, alpm_list_t *packages)
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{
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alpm_list_t *baddeps = NULL;
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_alpm_log(handle, ALPM_LOG_DEBUG, "check targets vs targets\n");
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check_conflict(handle, packages, packages, &baddeps, 0);
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return baddeps;
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}
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/* Check for target vs (db - target) conflicts */
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alpm_list_t *_alpm_outerconflicts(alpm_db_t *db, alpm_list_t *packages)
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{
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alpm_list_t *baddeps = NULL;
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if(db == NULL) {
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return NULL;
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}
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alpm_list_t *dblist = alpm_list_diff(_alpm_db_get_pkgcache(db),
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packages, _alpm_pkg_cmp);
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/* two checks to be done here for conflicts */
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_alpm_log(db->handle, ALPM_LOG_DEBUG, "check targets vs db\n");
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check_conflict(db->handle, packages, dblist, &baddeps, 1);
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_alpm_log(db->handle, ALPM_LOG_DEBUG, "check db vs targets\n");
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check_conflict(db->handle, dblist, packages, &baddeps, -1);
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alpm_list_free(dblist);
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return baddeps;
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}
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/** Check the package conflicts in a database
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*
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* @param handle the context handle
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* @param pkglist the list of packages to check
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* @return an alpm_list_t of alpm_conflict_t
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*/
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alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_handle_t *handle,
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alpm_list_t *pkglist)
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{
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CHECK_HANDLE(handle, return NULL);
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return _alpm_innerconflicts(handle, pkglist);
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}
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/* Adds alpm_fileconflict_t to a conflicts list. Pass the conflicts list, the
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* conflicting file path, and either two packages or one package and NULL.
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*/
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static alpm_list_t *add_fileconflict(alpm_handle_t *handle,
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alpm_list_t *conflicts, const char *filestr,
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alpm_pkg_t *pkg1, alpm_pkg_t *pkg2)
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{
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alpm_fileconflict_t *conflict;
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MALLOC(conflict, sizeof(alpm_fileconflict_t), goto error);
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STRDUP(conflict->target, pkg1->name, goto error);
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STRDUP(conflict->file, filestr, goto error);
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if(pkg2) {
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conflict->type = ALPM_FILECONFLICT_TARGET;
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STRDUP(conflict->ctarget, pkg2->name, goto error);
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} else {
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conflict->type = ALPM_FILECONFLICT_FILESYSTEM;
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STRDUP(conflict->ctarget, "", goto error);
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}
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conflicts = alpm_list_add(conflicts, conflict);
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_alpm_log(handle, ALPM_LOG_DEBUG, "found file conflict %s, packages %s and %s\n",
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filestr, pkg1->name, pkg2 ? pkg2->name : "(filesystem)");
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return conflicts;
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error:
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RET_ERR(handle, ALPM_ERR_MEMORY, conflicts);
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}
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void _alpm_fileconflict_free(alpm_fileconflict_t *conflict)
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{
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FREE(conflict->ctarget);
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FREE(conflict->file);
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FREE(conflict->target);
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FREE(conflict);
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}
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static int dir_belongsto_pkg(alpm_handle_t *handle, const char *dirpath,
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alpm_pkg_t *pkg)
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{
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alpm_list_t *i;
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struct stat sbuf;
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char path[PATH_MAX];
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char abspath[PATH_MAX];
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DIR *dir;
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struct dirent *ent = NULL;
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const char *root = handle->root;
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/* check directory is actually in package - used for subdirectory checks */
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if(!alpm_filelist_contains(alpm_pkg_get_files(pkg), dirpath)) {
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_alpm_log(handle, ALPM_LOG_DEBUG,
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"directory %s not in package %s\n", dirpath, pkg->name);
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return 0;
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}
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/* TODO: this is an overly strict check but currently pacman will not
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* overwrite a directory with a file (case 10/11 in add.c). Adjusting that
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* is not simple as even if the directory is being unowned by a conflicting
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* package, pacman does not sort this to ensure all required directory
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* "removals" happen before installation of file/symlink */
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/* check that no other _installed_ package owns the directory */
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for(i = _alpm_db_get_pkgcache(handle->db_local); i; i = i->next) {
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if(pkg == i->data) {
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continue;
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}
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if(alpm_filelist_contains(alpm_pkg_get_files(i->data), dirpath)) {
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_alpm_log(handle, ALPM_LOG_DEBUG,
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"file %s also in package %s\n", dirpath,
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((alpm_pkg_t*)i->data)->name);
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return 0;
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}
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}
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/* check all files in directory are owned by the package */
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snprintf(abspath, PATH_MAX, "%s%s", root, dirpath);
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dir = opendir(abspath);
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if(dir == NULL) {
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return 1;
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}
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while((ent = readdir(dir)) != NULL) {
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const char *name = ent->d_name;
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if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
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continue;
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}
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snprintf(path, PATH_MAX, "%s%s", dirpath, name);
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snprintf(abspath, PATH_MAX, "%s%s", root, path);
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if(stat(abspath, &sbuf) != 0) {
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continue;
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}
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if(S_ISDIR(sbuf.st_mode)) {
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if(dir_belongsto_pkg(handle, path, pkg)) {
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continue;
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} else {
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closedir(dir);
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return 0;
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}
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} else {
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if(alpm_filelist_contains(alpm_pkg_get_files(pkg), path)) {
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continue;
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} else {
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closedir(dir);
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_alpm_log(handle, ALPM_LOG_DEBUG,
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"unowned file %s found in directory\n", path);
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return 0;
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}
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}
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}
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closedir(dir);
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return 1;
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}
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/* Find file conflicts that may occur during the transaction with two checks:
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* 1: check every target against every target
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* 2: check every target against the filesystem */
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alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
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alpm_list_t *upgrade, alpm_list_t *rem)
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{
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alpm_list_t *i, *conflicts = NULL;
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size_t numtargs = alpm_list_count(upgrade);
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size_t current;
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size_t rootlen;
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if(!upgrade) {
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return NULL;
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}
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rootlen = strlen(handle->root);
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/* TODO this whole function needs a huge change, which hopefully will
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* be possible with real transactions. Right now we only do half as much
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* here as we do when we actually extract files in add.c with our 12
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* different cases. */
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for(current = 0, i = upgrade; i; i = i->next, current++) {
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alpm_pkg_t *p1 = i->data;
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alpm_list_t *j;
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alpm_filelist_t tmpfiles;
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alpm_pkg_t *dbpkg;
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size_t filenum;
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int percent = (current * 100) / numtargs;
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PROGRESS(handle, ALPM_PROGRESS_CONFLICTS_START, "", percent,
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numtargs, current);
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_alpm_filelist_resolve(handle, alpm_pkg_get_files(p1));
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/* CHECK 1: check every target against every target */
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_alpm_log(handle, ALPM_LOG_DEBUG, "searching for file conflicts: %s\n",
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p1->name);
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for(j = i->next; j; j = j->next) {
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alpm_list_t *common_files;
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alpm_pkg_t *p2 = j->data;
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_alpm_filelist_resolve(handle, alpm_pkg_get_files(p2));
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common_files = _alpm_filelist_intersection(alpm_pkg_get_files(p1),
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alpm_pkg_get_files(p2));
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if(common_files) {
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alpm_list_t *k;
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char path[PATH_MAX];
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for(k = common_files; k; k = k->next) {
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alpm_file_t *file = k->data;
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snprintf(path, PATH_MAX, "%s%s", handle->root, file->name);
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conflicts = add_fileconflict(handle, conflicts, path, p1, p2);
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if(handle->pm_errno == ALPM_ERR_MEMORY) {
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FREELIST(conflicts);
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FREELIST(common_files);
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return NULL;
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}
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}
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alpm_list_free(common_files);
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}
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}
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/* CHECK 2: check every target against the filesystem */
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_alpm_log(handle, ALPM_LOG_DEBUG, "searching for filesystem conflicts: %s\n",
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p1->name);
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dbpkg = _alpm_db_get_pkgfromcache(handle->db_local, p1->name);
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_alpm_filelist_resolve(handle, alpm_pkg_get_files(dbpkg));
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/* Do two different checks here. If the package is currently installed,
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* then only check files that are new in the new package. If the package
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* is not currently installed, then simply stat the whole filelist. Note
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* that the former list needs to be freed while the latter list should NOT
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* be freed. */
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if(dbpkg) {
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alpm_list_t *difference;
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/* older ver of package currently installed */
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difference = _alpm_filelist_difference(alpm_pkg_get_files(p1),
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alpm_pkg_get_files(dbpkg));
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tmpfiles.count = alpm_list_count(difference);
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tmpfiles.files = alpm_list_to_array(difference, tmpfiles.count,
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sizeof(alpm_file_t));
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alpm_list_free(difference);
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} else {
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/* no version of package currently installed */
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tmpfiles = *alpm_pkg_get_files(p1);
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}
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for(filenum = 0; filenum < tmpfiles.count; filenum++) {
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alpm_file_t *file = tmpfiles.files + filenum;
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const char *filestr = file->name;
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const char *relative_path;
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alpm_list_t *k;
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/* have we acted on this conflict? */
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int resolved_conflict = 0;
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struct stat lsbuf;
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char path[PATH_MAX];
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size_t pathlen;
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pathlen = snprintf(path, PATH_MAX, "%s%s", handle->root, filestr);
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/* stat the file - if it exists, do some checks */
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if(_alpm_lstat(path, &lsbuf) != 0) {
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continue;
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}
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_alpm_log(handle, ALPM_LOG_DEBUG, "checking possible conflict: %s\n", path);
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if(S_ISDIR(file->mode)) {
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struct stat sbuf;
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if(S_ISDIR(lsbuf.st_mode)) {
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_alpm_log(handle, ALPM_LOG_DEBUG, "file is a directory, not a conflict\n");
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continue;
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}
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stat(path, &sbuf);
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if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(sbuf.st_mode)) {
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_alpm_log(handle, ALPM_LOG_DEBUG,
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"file is a symlink to a dir, hopefully not a conflict\n");
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continue;
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}
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/* if we made it to here, we want all subsequent path comparisons to
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* not include the trailing slash. This allows things like file ->
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* directory replacements. */
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path[pathlen - 1] = '\0';
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}
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relative_path = path + rootlen;
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/* Check remove list (will we remove the conflicting local file?) */
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for(k = rem; k && !resolved_conflict; k = k->next) {
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alpm_pkg_t *rempkg = k->data;
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if(rempkg && alpm_filelist_contains(alpm_pkg_get_files(rempkg),
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relative_path)) {
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_alpm_log(handle, ALPM_LOG_DEBUG,
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"local file will be removed, not a conflict\n");
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resolved_conflict = 1;
|
|
}
|
|
}
|
|
|
|
/* Look at all the targets to see if file has changed hands */
|
|
for(k = upgrade; k && !resolved_conflict; k = k->next) {
|
|
alpm_pkg_t *p2 = k->data;
|
|
if(!p2 || strcmp(p1->name, p2->name) == 0) {
|
|
continue;
|
|
}
|
|
alpm_pkg_t *localp2 = _alpm_db_get_pkgfromcache(handle->db_local, p2->name);
|
|
|
|
/* localp2->files will be removed (target conflicts are handled by CHECK 1) */
|
|
if(localp2 && alpm_filelist_contains(alpm_pkg_get_files(localp2), filestr)) {
|
|
/* skip removal of file, but not add. this will prevent a second
|
|
* package from removing the file when it was already installed
|
|
* by its new owner (whether the file is in backup array or not */
|
|
handle->trans->skip_remove =
|
|
alpm_list_add(handle->trans->skip_remove, strdup(filestr));
|
|
_alpm_log(handle, ALPM_LOG_DEBUG,
|
|
"file changed packages, adding to remove skiplist\n");
|
|
resolved_conflict = 1;
|
|
}
|
|
}
|
|
|
|
/* check if all files of the dir belong to the installed pkg */
|
|
if(!resolved_conflict && S_ISDIR(lsbuf.st_mode) && dbpkg) {
|
|
char *dir = malloc(strlen(filestr) + 2);
|
|
sprintf(dir, "%s/", filestr);
|
|
if(alpm_filelist_contains(alpm_pkg_get_files(dbpkg), dir)) {
|
|
_alpm_log(handle, ALPM_LOG_DEBUG,
|
|
"checking if all files in %s belong to %s\n",
|
|
dir, dbpkg->name);
|
|
resolved_conflict = dir_belongsto_pkg(handle, dir, dbpkg);
|
|
}
|
|
free(dir);
|
|
}
|
|
|
|
/* check if a component of the filepath was a link. canonicalize the path
|
|
* and look for it in the old package. note that the actual file under
|
|
* consideration cannot itself be a link, as it might be unowned- path
|
|
* components can be safely checked as all directories are "unowned". */
|
|
if(!resolved_conflict && dbpkg && !S_ISLNK(lsbuf.st_mode)) {
|
|
char rpath[PATH_MAX];
|
|
if(realpath(path, rpath)) {
|
|
const char *relative_rpath = rpath + rootlen;
|
|
if(alpm_filelist_contains(alpm_pkg_get_files(dbpkg), relative_rpath)) {
|
|
_alpm_log(handle, ALPM_LOG_DEBUG,
|
|
"package contained the resolved realpath\n");
|
|
resolved_conflict = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* is the file unowned and in the backup list of the new package? */
|
|
if(!resolved_conflict && _alpm_needbackup(filestr, p1)) {
|
|
alpm_list_t *local_pkgs = _alpm_db_get_pkgcache(handle->db_local);
|
|
int found = 0;
|
|
for(k = local_pkgs; k && !found; k = k->next) {
|
|
if(alpm_filelist_contains(alpm_pkg_get_files(k->data), filestr)) {
|
|
found = 1;
|
|
}
|
|
}
|
|
if(!found) {
|
|
_alpm_log(handle, ALPM_LOG_DEBUG,
|
|
"file was unowned but in new backup list\n");
|
|
resolved_conflict = 1;
|
|
}
|
|
}
|
|
|
|
if(!resolved_conflict) {
|
|
conflicts = add_fileconflict(handle, conflicts, path, p1, NULL);
|
|
if(handle->pm_errno == ALPM_ERR_MEMORY) {
|
|
FREELIST(conflicts);
|
|
if(dbpkg) {
|
|
/* only freed if it was generated from _alpm_filelist_difference() */
|
|
free(tmpfiles.files);
|
|
}
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
if(dbpkg) {
|
|
/* only freed if it was generated from _alpm_filelist_difference() */
|
|
free(tmpfiles.files);
|
|
}
|
|
}
|
|
PROGRESS(handle, ALPM_PROGRESS_CONFLICTS_START, "", 100,
|
|
numtargs, current);
|
|
|
|
return conflicts;
|
|
}
|
|
|
|
/* vim: set ts=2 sw=2 noet: */
|