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[pacman-ng.git] / lib / libalpm / conflict.c

/*
 *  conflict.c
 *
 *  Copyright (c) 2006-2012 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
 *  Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
 *  Copyright (c) 2006 by Christian Hamar <krics@linuxforum.hu>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <dirent.h>

/* libalpm */
#include "conflict.h"
#include "alpm_list.h"
#include "alpm.h"
#include "handle.h"
#include "trans.h"
#include "util.h"
#include "log.h"
#include "deps.h"
#include "filelist.h"

static alpm_conflict_t *conflict_new(alpm_pkg_t *pkg1, alpm_pkg_t *pkg2,
                alpm_depend_t *reason)
{
        alpm_conflict_t *conflict;

        MALLOC(conflict, sizeof(alpm_conflict_t), return NULL);

        conflict->package1_hash = pkg1->name_hash;
        conflict->package2_hash = pkg2->name_hash;
        STRDUP(conflict->package1, pkg1->name, return NULL);
        STRDUP(conflict->package2, pkg2->name, return NULL);
        conflict->reason = reason;

        return conflict;
}

void _alpm_conflict_free(alpm_conflict_t *conflict)
{
        FREE(conflict->package2);
        FREE(conflict->package1);
        FREE(conflict);
}

alpm_conflict_t *_alpm_conflict_dup(const alpm_conflict_t *conflict)
{
        alpm_conflict_t *newconflict;
        CALLOC(newconflict, 1, sizeof(alpm_conflict_t), return NULL);

        newconflict->package1_hash = conflict->package1_hash;
        newconflict->package2_hash = conflict->package2_hash;
        STRDUP(newconflict->package1, conflict->package1, return NULL);
        STRDUP(newconflict->package2, conflict->package2, return NULL);
        newconflict->reason = conflict->reason;

        return newconflict;
}

static int conflict_isin(alpm_conflict_t *needle, alpm_list_t *haystack)
{
        alpm_list_t *i;
        for(i = haystack; i; i = i->next) {
                alpm_conflict_t *conflict = i->data;
                if(needle->package1_hash == conflict->package1_hash
                                && needle->package2_hash == conflict->package2_hash
                                && strcmp(needle->package1, conflict->package1) == 0
                                && strcmp(needle->package2, conflict->package2) == 0) {
                        return 1;
                }
        }

        return 0;
}

/** Adds the pkg1/pkg2 conflict to the baddeps list.
 * @param handle the context handle
 * @param baddeps list to add conflict to
 * @param pkg1 first package
 * @param pkg2 package causing conflict
 * @param reason reason for this conflict
 */
static int add_conflict(alpm_handle_t *handle, alpm_list_t **baddeps,
                alpm_pkg_t *pkg1, alpm_pkg_t *pkg2, alpm_depend_t *reason)
{
        alpm_conflict_t *conflict = conflict_new(pkg1, pkg2, reason);
        if(!conflict) {
                return -1;
        }
        if(!conflict_isin(conflict, *baddeps)) {
                char *conflict_str = alpm_dep_compute_string(reason);
                *baddeps = alpm_list_add(*baddeps, conflict);
                _alpm_log(handle, ALPM_LOG_DEBUG, "package %s conflicts with %s (by %s)\n",
                                pkg1->name, pkg2->name, conflict_str);
                free(conflict_str);
        } else {
                _alpm_conflict_free(conflict);
        }
        return 0;
}

/** Check if packages from list1 conflict with packages from list2.
 * This looks at the conflicts fields of all packages from list1, and sees
 * if they match packages from list2.
 * If a conflict (pkg1, pkg2) is found, it is added to the baddeps list
 * in this order if order >= 0, or reverse order (pkg2,pkg1) otherwise.
 *
 * @param handle the context handle
 * @param list1 first list of packages
 * @param list2 second list of packages
 * @param baddeps list to store conflicts
 * @param order if >= 0 the conflict order is preserved, if < 0 it's reversed
 */
static void check_conflict(alpm_handle_t *handle,
                alpm_list_t *list1, alpm_list_t *list2,
                alpm_list_t **baddeps, int order) {
        alpm_list_t *i;

        if(!baddeps) {
                return;
        }
        for(i = list1; i; i = i->next) {
                alpm_pkg_t *pkg1 = i->data;
                alpm_list_t *j;

                for(j = alpm_pkg_get_conflicts(pkg1); j; j = j->next) {
                        alpm_depend_t *conflict = j->data;
                        alpm_list_t *k;

                        for(k = list2; k; k = k->next) {
                                alpm_pkg_t *pkg2 = k->data;

                                if(pkg1->name_hash == pkg2->name_hash
                                                && strcmp(pkg1->name, pkg2->name) == 0) {
                                        /* skip the package we're currently processing */
                                        continue;
                                }

                                if(_alpm_depcmp(pkg2, conflict)) {
                                        if(order >= 0) {
                                                add_conflict(handle, baddeps, pkg1, pkg2, conflict);
                                        } else {
                                                add_conflict(handle, baddeps, pkg2, pkg1, conflict);
                                        }
                                }
                        }
                }
        }
}

/* Check for inter-conflicts */
alpm_list_t *_alpm_innerconflicts(alpm_handle_t *handle, alpm_list_t *packages)
{
        alpm_list_t *baddeps = NULL;

        _alpm_log(handle, ALPM_LOG_DEBUG, "check targets vs targets\n");
        check_conflict(handle, packages, packages, &baddeps, 0);

        return baddeps;
}

/* Check for target vs (db - target) conflicts */
alpm_list_t *_alpm_outerconflicts(alpm_db_t *db, alpm_list_t *packages)
{
        alpm_list_t *baddeps = NULL;

        if(db == NULL) {
                return NULL;
        }

        alpm_list_t *dblist = alpm_list_diff(_alpm_db_get_pkgcache(db),
                        packages, _alpm_pkg_cmp);

        /* two checks to be done here for conflicts */
        _alpm_log(db->handle, ALPM_LOG_DEBUG, "check targets vs db\n");
        check_conflict(db->handle, packages, dblist, &baddeps, 1);
        _alpm_log(db->handle, ALPM_LOG_DEBUG, "check db vs targets\n");
        check_conflict(db->handle, dblist, packages, &baddeps, -1);

        alpm_list_free(dblist);
        return baddeps;
}

/** Check the package conflicts in a database
 *
 * @param handle the context handle
 * @param pkglist the list of packages to check
 * @return an alpm_list_t of alpm_conflict_t
 */
alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_handle_t *handle,
                alpm_list_t *pkglist)
{
        CHECK_HANDLE(handle, return NULL);
        return _alpm_innerconflicts(handle, pkglist);
}

/* Adds alpm_fileconflict_t to a conflicts list. Pass the conflicts list, the
 * conflicting file path, and either two packages or one package and NULL.
 */
static alpm_list_t *add_fileconflict(alpm_handle_t *handle,
                alpm_list_t *conflicts, const char *filestr,
                alpm_pkg_t *pkg1, alpm_pkg_t *pkg2)
{
        alpm_fileconflict_t *conflict;
        MALLOC(conflict, sizeof(alpm_fileconflict_t), goto error);

        STRDUP(conflict->target, pkg1->name, goto error);
        STRDUP(conflict->file, filestr, goto error);
        if(pkg2) {
                conflict->type = ALPM_FILECONFLICT_TARGET;
                STRDUP(conflict->ctarget, pkg2->name, goto error);
        } else {
                conflict->type = ALPM_FILECONFLICT_FILESYSTEM;
                STRDUP(conflict->ctarget, "", goto error);
        }

        conflicts = alpm_list_add(conflicts, conflict);
        _alpm_log(handle, ALPM_LOG_DEBUG, "found file conflict %s, packages %s and %s\n",
                  filestr, pkg1->name, pkg2 ? pkg2->name : "(filesystem)");

        return conflicts;

error:
        RET_ERR(handle, ALPM_ERR_MEMORY, conflicts);
}

void _alpm_fileconflict_free(alpm_fileconflict_t *conflict)
{
        FREE(conflict->ctarget);
        FREE(conflict->file);
        FREE(conflict->target);
        FREE(conflict);
}

static int dir_belongsto_pkg(alpm_handle_t *handle, const char *dirpath,
                alpm_pkg_t *pkg)
{
        alpm_list_t *i;
        struct stat sbuf;
        char path[PATH_MAX];
        char abspath[PATH_MAX];
        DIR *dir;
        struct dirent *ent = NULL;
        const char *root = handle->root;

        /* check directory is actually in package - used for subdirectory checks */
        if(!alpm_filelist_contains(alpm_pkg_get_files(pkg), dirpath)) {
                _alpm_log(handle, ALPM_LOG_DEBUG,
                                "directory %s not in package %s\n", dirpath, pkg->name);
                return 0;
        }

        /* TODO: this is an overly strict check but currently pacman will not
         * overwrite a directory with a file (case 10/11 in add.c). Adjusting that
         * is not simple as even if the directory is being unowned by a conflicting
         * package, pacman does not sort this to ensure all required directory
         * "removals" happen before installation of file/symlink */

        /* check that no other _installed_ package owns the directory */
        for(i = _alpm_db_get_pkgcache(handle->db_local); i; i = i->next) {
                if(pkg == i->data) {
                        continue;
                }

                if(alpm_filelist_contains(alpm_pkg_get_files(i->data), dirpath)) {
                        _alpm_log(handle, ALPM_LOG_DEBUG,
                                        "file %s also in package %s\n", dirpath,
                                        ((alpm_pkg_t*)i->data)->name);
                        return 0;
                }
        }

        /* check all files in directory are owned by the package */
        snprintf(abspath, PATH_MAX, "%s%s", root, dirpath);
        dir = opendir(abspath);
        if(dir == NULL) {
                return 1;
        }

        while((ent = readdir(dir)) != NULL) {
                const char *name = ent->d_name;

                if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
                        continue;
                }
                snprintf(path, PATH_MAX, "%s%s", dirpath, name);
                snprintf(abspath, PATH_MAX, "%s%s", root, path);
                if(stat(abspath, &sbuf) != 0) {
                        continue;
                }
                if(S_ISDIR(sbuf.st_mode)) {
                        if(dir_belongsto_pkg(handle, path, pkg)) {
                                continue;
                        } else {
                                closedir(dir);
                                return 0;
                        }
                } else {
                        if(alpm_filelist_contains(alpm_pkg_get_files(pkg), path)) {
                                continue;
                        } else {
                                closedir(dir);
                                _alpm_log(handle, ALPM_LOG_DEBUG,
                                                "unowned file %s found in directory\n", path);
                                return 0;
                        }
                }
        }
        closedir(dir);
        return 1;
}

/* Find file conflicts that may occur during the transaction with two checks:
 * 1: check every target against every target
 * 2: check every target against the filesystem */
alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
                alpm_list_t *upgrade, alpm_list_t *rem)
{
        alpm_list_t *i, *conflicts = NULL;
        size_t numtargs = alpm_list_count(upgrade);
        size_t current;
        size_t rootlen;

        if(!upgrade) {
                return NULL;
        }

        rootlen = strlen(handle->root);

        /* TODO this whole function needs a huge change, which hopefully will
         * be possible with real transactions. Right now we only do half as much
         * here as we do when we actually extract files in add.c with our 12
         * different cases. */
        for(current = 0, i = upgrade; i; i = i->next, current++) {
                alpm_pkg_t *p1 = i->data;
                alpm_list_t *j;
                alpm_filelist_t tmpfiles;
                alpm_pkg_t *dbpkg;
                size_t filenum;

                int percent = (current * 100) / numtargs;
                PROGRESS(handle, ALPM_PROGRESS_CONFLICTS_START, "", percent,
                         numtargs, current);
                /* CHECK 1: check every target against every target */
                _alpm_log(handle, ALPM_LOG_DEBUG, "searching for file conflicts: %s\n",
                                p1->name);
                for(j = i->next; j; j = j->next) {
                        alpm_list_t *common_files;
                        alpm_pkg_t *p2 = j->data;
                        common_files = _alpm_filelist_intersection(alpm_pkg_get_files(p1),
                                        alpm_pkg_get_files(p2));

                        if(common_files) {
                                alpm_list_t *k;
                                char path[PATH_MAX];
                                for(k = common_files; k; k = k->next) {
                                        alpm_file_t *file = k->data;
                                        snprintf(path, PATH_MAX, "%s%s", handle->root, file->name);
                                        conflicts = add_fileconflict(handle, conflicts, path, p1, p2);
                                        if(handle->pm_errno == ALPM_ERR_MEMORY) {
                                                FREELIST(conflicts);
                                                FREELIST(common_files);
                                                return NULL;
                                        }
                                }
                                alpm_list_free(common_files);
                        }
                }

                /* CHECK 2: check every target against the filesystem */
                _alpm_log(handle, ALPM_LOG_DEBUG, "searching for filesystem conflicts: %s\n",
                                p1->name);
                dbpkg = _alpm_db_get_pkgfromcache(handle->db_local, p1->name);

                /* Do two different checks here. If the package is currently installed,
                 * then only check files that are new in the new package. If the package
                 * is not currently installed, then simply stat the whole filelist. Note
                 * that the former list needs to be freed while the latter list should NOT
                 * be freed. */
                if(dbpkg) {
                        alpm_list_t *difference;
                        /* older ver of package currently installed */
                        difference = _alpm_filelist_difference(alpm_pkg_get_files(p1),
                                        alpm_pkg_get_files(dbpkg));
                        tmpfiles.count = alpm_list_count(difference);
                        tmpfiles.files = alpm_list_to_array(difference, tmpfiles.count,
                                        sizeof(alpm_file_t));
                        alpm_list_free(difference);
                } else {
                        /* no version of package currently installed */
                        tmpfiles = *alpm_pkg_get_files(p1);
                }

                for(filenum = 0; filenum < tmpfiles.count; filenum++) {
                        alpm_file_t *file = tmpfiles.files + filenum;
                        const char *filestr = file->name;
                        const char *relative_path;
                        alpm_list_t *k;
                        /* have we acted on this conflict? */
                        int resolved_conflict = 0;
                        struct stat lsbuf;
                        char path[PATH_MAX];
                        size_t pathlen;

                        pathlen = snprintf(path, PATH_MAX, "%s%s", handle->root, filestr);

                        /* stat the file - if it exists, do some checks */
                        if(_alpm_lstat(path, &lsbuf) != 0) {
                                continue;
                        }

                        _alpm_log(handle, ALPM_LOG_DEBUG, "checking possible conflict: %s\n", path);

                        if(S_ISDIR(file->mode)) {
                                struct stat sbuf;
                                if(S_ISDIR(lsbuf.st_mode)) {
                                        _alpm_log(handle, ALPM_LOG_DEBUG, "file is a directory, not a conflict\n");
                                        continue;
                                }
                                stat(path, &sbuf);
                                if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(sbuf.st_mode)) {
                                        _alpm_log(handle, ALPM_LOG_DEBUG,
                                                        "file is a symlink to a dir, hopefully not a conflict\n");
                                        continue;
                                }
                                /* if we made it to here, we want all subsequent path comparisons to
                                 * not include the trailing slash. This allows things like file ->
                                 * directory replacements. */
                                path[pathlen - 1] = '\0';
                        }

                        relative_path = path + rootlen;

                        /* Check remove list (will we remove the conflicting local file?) */
                        for(k = rem; k && !resolved_conflict; k = k->next) {
                                alpm_pkg_t *rempkg = k->data;
                                if(rempkg && alpm_filelist_contains(alpm_pkg_get_files(rempkg),
                                                        relative_path)) {
                                        _alpm_log(handle, ALPM_LOG_DEBUG,
                                                        "local file will be removed, not a conflict\n");
                                        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: */