/* * conflict.c * * Copyright (c) 2006-2011 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 "config.h" #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 "handle.h" #include "trans.h" #include "util.h" #include "log.h" #include "deps.h" pmconflict_t *_alpm_conflict_new(const char *package1, const char *package2, const char *reason) { pmconflict_t *conflict; ALPM_LOG_FUNC; MALLOC(conflict, sizeof(pmconflict_t), RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(conflict->package1, package1, RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(conflict->package2, package2, RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(conflict->reason, reason, RET_ERR(PM_ERR_MEMORY, NULL)); return conflict; } void _alpm_conflict_free(pmconflict_t *conflict) { FREE(conflict->package2); FREE(conflict->package1); FREE(conflict->reason); FREE(conflict); } pmconflict_t *_alpm_conflict_dup(const pmconflict_t *conflict) { pmconflict_t *newconflict; CALLOC(newconflict, 1, sizeof(pmconflict_t), RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(newconflict->package1, conflict->package1, RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(newconflict->package2, conflict->package2, RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(newconflict->reason, conflict->reason, RET_ERR(PM_ERR_MEMORY, NULL)); return newconflict; } static int conflict_isin(pmconflict_t *needle, alpm_list_t *haystack) { alpm_list_t *i; const char *npkg1 = needle->package1; const char *npkg2 = needle->package2; ALPM_LOG_FUNC; for(i = haystack; i; i = i->next) { pmconflict_t *conflict = i->data; const char *cpkg1 = conflict->package1; const char *cpkg2 = conflict->package2; if((strcmp(cpkg1, npkg1) == 0 && strcmp(cpkg2, npkg2) == 0) || (strcmp(cpkg1, npkg2) == 0 && strcmp(cpkg2, npkg1) == 0)) { return 1; } } return 0; } /** Adds the pkg1/pkg2 conflict to the baddeps list * @param *baddeps list to add conflict to * @param pkg1 first package * @param pkg2 package causing conflict */ static void add_conflict(alpm_list_t **baddeps, const char *pkg1, const char *pkg2, const char *reason) { pmconflict_t *conflict = _alpm_conflict_new(pkg1, pkg2, reason); _alpm_log(PM_LOG_DEBUG, "package %s conflicts with %s (by %s)\n", pkg1, pkg2, reason); if(conflict && !conflict_isin(conflict, *baddeps)) { *baddeps = alpm_list_add(*baddeps, conflict); } else { _alpm_conflict_free(conflict); } } /** 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 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_list_t *list1, alpm_list_t *list2, alpm_list_t **baddeps, int order) { alpm_list_t *i, *j, *k; if(!baddeps) { return; } for(i = list1; i; i = i->next) { pmpkg_t *pkg1 = i->data; const char *pkg1name = alpm_pkg_get_name(pkg1); for(j = alpm_pkg_get_conflicts(pkg1); j; j = j->next) { const char *conflict = j->data; pmdepend_t *parsed_conflict = _alpm_splitdep(conflict); for(k = list2; k; k = k->next) { pmpkg_t *pkg2 = k->data; const char *pkg2name = alpm_pkg_get_name(pkg2); if(strcmp(pkg1name, pkg2name) == 0) { /* skip the package we're currently processing */ continue; } if(_alpm_depcmp(pkg2, parsed_conflict)) { if(order >= 0) { add_conflict(baddeps, pkg1name, pkg2name, conflict); } else { add_conflict(baddeps, pkg2name, pkg1name, conflict); } } } _alpm_dep_free(parsed_conflict); } } } /* Check for inter-conflicts */ alpm_list_t *_alpm_innerconflicts(alpm_list_t *packages) { alpm_list_t *baddeps = NULL; ALPM_LOG_FUNC; _alpm_log(PM_LOG_DEBUG, "check targets vs targets\n"); check_conflict(packages, packages, &baddeps, 0); return baddeps; } /* Check for target vs (db - target) conflicts * In case of conflict the package1 field of pmdepconflict_t contains * the target package, package2 field contains the local package */ alpm_list_t *_alpm_outerconflicts(pmdb_t *db, alpm_list_t *packages) { alpm_list_t *baddeps = NULL; ALPM_LOG_FUNC; 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(PM_LOG_DEBUG, "check targets vs db\n"); check_conflict(packages, dblist, &baddeps, 1); _alpm_log(PM_LOG_DEBUG, "check db vs targets\n"); check_conflict(dblist, packages, &baddeps, -1); alpm_list_free(dblist); return baddeps; } /** Check the package conflicts in a database * * @param pkglist the list of packages to check * @return an alpm_list_t of pmconflict_t */ alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_list_t *pkglist) { return _alpm_innerconflicts(pkglist); } static const int DIFFERENCE = 0; static const int INTERSECT = 1; /* Returns a set operation on the provided two lists of files. * Pre-condition: both lists are sorted! * * Operations: * DIFFERENCE - a difference operation is performed. filesA - filesB. * INTERSECT - an intersection operation is performed. filesA & filesB. */ static alpm_list_t *filelist_operation(alpm_list_t *filesA, alpm_list_t *filesB, int operation) { alpm_list_t *ret = NULL; alpm_list_t *pA = filesA, *pB = filesB; while(pA && pB) { const char *strA = pA->data; const char *strB = pB->data; /* skip directories, we don't care about them */ if(strA[strlen(strA)-1] == '/') { pA = pA->next; } else if(strB[strlen(strB)-1] == '/') { pB = pB->next; } else { int cmp = strcmp(strA, strB); if(cmp < 0) { if(operation == DIFFERENCE) { /* item only in filesA, qualifies as a difference */ ret = alpm_list_add(ret, strdup(strA)); } pA = pA->next; } else if(cmp > 0) { pB = pB->next; } else { if(operation == INTERSECT) { /* item in both, qualifies as an intersect */ ret = alpm_list_add(ret, strdup(strA)); } pA = pA->next; pB = pB->next; } } } /* if doing a difference, ensure we have completely emptied pA */ while(operation == DIFFERENCE && pA) { const char *strA = pA->data; /* skip directories */ if(strA[strlen(strA)-1] != '/') { ret = alpm_list_add(ret, strdup(strA)); } pA = pA->next; } return ret; } /* Adds pmfileconflict_t to a conflicts list. Pass the conflicts list, type (either * PM_FILECONFLICT_TARGET or PM_FILECONFLICT_FILESYSTEM), a file string, and either * two package names or one package name and NULL. This is a wrapper for former * functionality that was done inline. */ static alpm_list_t *add_fileconflict(alpm_list_t *conflicts, pmfileconflicttype_t type, const char *filestr, const char* name1, const char* name2) { pmfileconflict_t *conflict; MALLOC(conflict, sizeof(pmfileconflict_t), RET_ERR(PM_ERR_MEMORY, NULL)); conflict->type = type; STRDUP(conflict->target, name1, RET_ERR(PM_ERR_MEMORY, NULL)); STRDUP(conflict->file, filestr, RET_ERR(PM_ERR_MEMORY, NULL)); if(name2) { STRDUP(conflict->ctarget, name2, RET_ERR(PM_ERR_MEMORY, NULL)); } else { STRDUP(conflict->ctarget, "", RET_ERR(PM_ERR_MEMORY, NULL)); } conflicts = alpm_list_add(conflicts, conflict); _alpm_log(PM_LOG_DEBUG, "found file conflict %s, packages %s and %s\n", filestr, name1, name2 ? name2 : "(filesystem)"); return conflicts; } void _alpm_fileconflict_free(pmfileconflict_t *conflict) { FREE(conflict->ctarget); FREE(conflict->file); FREE(conflict->target); FREE(conflict); } static int dir_belongsto_pkg(char *dirpath, pmpkg_t *pkg) { struct dirent *ent = NULL; struct stat sbuf; char path[PATH_MAX]; char abspath[PATH_MAX]; DIR *dir; snprintf(abspath, PATH_MAX, "%s%s", handle->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", handle->root, path); if(stat(abspath, &sbuf) != 0) { continue; } if(S_ISDIR(sbuf.st_mode)) { if(dir_belongsto_pkg(path, pkg)) { continue; } else { closedir(dir); return 0; } } else { if(alpm_list_find_str(alpm_pkg_get_files(pkg), path)) { continue; } else { closedir(dir); 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(pmdb_t *db, pmtrans_t *trans, alpm_list_t *upgrade, alpm_list_t *remove) { alpm_list_t *i, *j, *conflicts = NULL; size_t numtargs = alpm_list_count(upgrade); size_t current; ALPM_LOG_FUNC; if(db == NULL || upgrade == NULL || trans == NULL) { return NULL; } /* 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_list_t *k, *tmpfiles = NULL; pmpkg_t *p1, *p2, *dbpkg; char path[PATH_MAX+1]; p1 = i->data; if(!p1) { continue; } int percent = (current * 100) / numtargs; PROGRESS(trans, PM_TRANS_PROGRESS_CONFLICTS_START, "", percent, numtargs, current); /* CHECK 1: check every target against every target */ _alpm_log(PM_LOG_DEBUG, "searching for file conflicts: %s\n", alpm_pkg_get_name(p1)); for(j = i->next; j; j = j->next) { p2 = j->data; if(!p2) { continue; } tmpfiles = filelist_operation( alpm_pkg_get_files(p1), alpm_pkg_get_files(p2), INTERSECT); if(tmpfiles) { for(k = tmpfiles; k; k = k->next) { snprintf(path, PATH_MAX, "%s%s", handle->root, (char *)k->data); conflicts = add_fileconflict(conflicts, PM_FILECONFLICT_TARGET, path, alpm_pkg_get_name(p1), alpm_pkg_get_name(p2)); } FREELIST(tmpfiles); } } /* declarations for second check */ struct stat lsbuf, sbuf; char *filestr = NULL; /* CHECK 2: check every target against the filesystem */ _alpm_log(PM_LOG_DEBUG, "searching for filesystem conflicts: %s\n", p1->name); dbpkg = _alpm_db_get_pkgfromcache(db, 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 */ if(dbpkg) { /* older ver of package currently installed */ tmpfiles = filelist_operation(alpm_pkg_get_files(p1), alpm_pkg_get_files(dbpkg), DIFFERENCE); } else { /* no version of package currently installed */ tmpfiles = alpm_list_strdup(alpm_pkg_get_files(p1)); } for(j = tmpfiles; j; j = j->next) { filestr = j->data; 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; } stat(path, &sbuf); if(path[strlen(path)-1] == '/') { if(S_ISDIR(lsbuf.st_mode)) { _alpm_log(PM_LOG_DEBUG, "%s is a directory, not a conflict\n", path); continue; } else if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(sbuf.st_mode)) { _alpm_log(PM_LOG_DEBUG, "%s is a symlink to a dir, hopefully not a conflict\n", path); continue; } } _alpm_log(PM_LOG_DEBUG, "checking possible conflict: %s\n", path); int resolved_conflict = 0; /* have we acted on this conflict? */ /* Check remove list (will we remove the conflicting local file?) */ for(k = remove; k && !resolved_conflict; k = k->next) { pmpkg_t *rempkg = k->data; if(rempkg && alpm_list_find_str(alpm_pkg_get_files(rempkg), filestr)) { _alpm_log(PM_LOG_DEBUG, "local file will be removed, not a conflict: %s\n", filestr); resolved_conflict = 1; } } /* Look at all the targets to see if file has changed hands */ for(k = upgrade; k && !resolved_conflict; k = k->next) { p2 = k->data; if(!p2 || strcmp(p1->name, p2->name) == 0) { continue; } pmpkg_t *localp2 = _alpm_db_get_pkgfromcache(db, p2->name); /* localp2->files will be removed (target conflicts are handled by CHECK 1) */ if(localp2 && alpm_list_find_str(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 */ trans->skip_remove = alpm_list_add(trans->skip_remove, strdup(filestr)); _alpm_log(PM_LOG_DEBUG, "file changed packages, adding to remove skiplist: %s\n", filestr); 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_list_find_str(alpm_pkg_get_files(dbpkg),dir)) { _alpm_log(PM_LOG_DEBUG, "check if all files in %s belongs to %s\n", dir, dbpkg->name); resolved_conflict = dir_belongsto_pkg(filestr, dbpkg); } free(dir); } if(!resolved_conflict && dbpkg) { char *rpath = calloc(PATH_MAX+1, sizeof(char)); if(!realpath(path, rpath)) { FREE(rpath); continue; } char *filestr = rpath + strlen(handle->root); if(alpm_list_find_str(alpm_pkg_get_files(dbpkg),filestr)) { resolved_conflict = 1; } free(rpath); } if(!resolved_conflict) { _alpm_log(PM_LOG_DEBUG, "file found in conflict: %s\n", path); conflicts = add_fileconflict(conflicts, PM_FILECONFLICT_FILESYSTEM, path, p1->name, NULL); } } FREELIST(tmpfiles); } PROGRESS(trans, PM_TRANS_PROGRESS_CONFLICTS_START, "", 100, numtargs, current); return conflicts; } const char SYMEXPORT *alpm_conflict_get_package1(pmconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->package1; } const char SYMEXPORT *alpm_conflict_get_package2(pmconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->package2; } const char SYMEXPORT *alpm_conflict_get_reason(pmconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->reason; } const char SYMEXPORT *alpm_fileconflict_get_target(pmfileconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->target; } pmfileconflicttype_t SYMEXPORT alpm_fileconflict_get_type(pmfileconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return -1); ASSERT(conflict != NULL, return -1); return conflict->type; } const char SYMEXPORT *alpm_fileconflict_get_file(pmfileconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->file; } const char SYMEXPORT *alpm_fileconflict_get_ctarget(pmfileconflict_t *conflict) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return NULL); ASSERT(conflict != NULL, return NULL); return conflict->ctarget; } /* vim: set ts=2 sw=2 noet: */