/* * remove.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) 2005 by Christian Hamar <krics@linuxforum.hu> * Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org> * Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org> * * 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 <errno.h> #include <string.h> #include <limits.h> #include <unistd.h> #include <sys/stat.h> /* libalpm */ #include "remove.h" #include "alpm_list.h" #include "alpm.h" #include "trans.h" #include "util.h" #include "log.h" #include "backup.h" #include "package.h" #include "db.h" #include "deps.h" #include "handle.h" #include "conflict.h" int SYMEXPORT alpm_remove_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg) { const char *pkgname; alpm_trans_t *trans; /* Sanity checks */ CHECK_HANDLE(handle, return -1); ASSERT(pkg != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1)); ASSERT(handle == pkg->handle, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1)); trans = handle->trans; ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1)); ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(handle, ALPM_ERR_TRANS_NOT_INITIALIZED, -1)); pkgname = pkg->name; if(_alpm_pkg_find(trans->remove, pkgname)) { RET_ERR(handle, ALPM_ERR_TRANS_DUP_TARGET, -1); } _alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s to the transaction remove list\n", pkgname); trans->remove = alpm_list_add(trans->remove, _alpm_pkg_dup(pkg)); return 0; } static void remove_prepare_cascade(alpm_handle_t *handle, alpm_list_t *lp) { alpm_trans_t *trans = handle->trans; while(lp) { alpm_list_t *i; for(i = lp; i; i = i->next) { alpm_depmissing_t *miss = i->data; alpm_pkg_t *info = _alpm_db_get_pkgfromcache(handle->db_local, miss->target); if(info) { if(!_alpm_pkg_find(trans->remove, alpm_pkg_get_name(info))) { _alpm_log(handle, ALPM_LOG_DEBUG, "pulling %s in target list\n", alpm_pkg_get_name(info)); trans->remove = alpm_list_add(trans->remove, _alpm_pkg_dup(info)); } } else { _alpm_log(handle, ALPM_LOG_ERROR, _("could not find %s in database -- skipping\n"), miss->target); } } alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free); alpm_list_free(lp); lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local), trans->remove, NULL, 1); } } static void remove_prepare_keep_needed(alpm_handle_t *handle, alpm_list_t *lp) { alpm_trans_t *trans = handle->trans; /* Remove needed packages (which break dependencies) from target list */ while(lp != NULL) { alpm_list_t *i; for(i = lp; i; i = i->next) { alpm_depmissing_t *miss = i->data; void *vpkg; alpm_pkg_t *pkg = _alpm_pkg_find(trans->remove, miss->causingpkg); if(pkg == NULL) { continue; } trans->remove = alpm_list_remove(trans->remove, pkg, _alpm_pkg_cmp, &vpkg); pkg = vpkg; if(pkg) { _alpm_log(handle, ALPM_LOG_WARNING, _("removing %s from target list\n"), alpm_pkg_get_name(pkg)); _alpm_pkg_free(pkg); } } alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free); alpm_list_free(lp); lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local), trans->remove, NULL, 1); } } /** Transaction preparation for remove actions. * This functions takes a pointer to a alpm_list_t which will be * filled with a list of alpm_depmissing_t* objects representing * the packages blocking the transaction. * @param handle the context handle * @param data a pointer to an alpm_list_t* to fill */ int _alpm_remove_prepare(alpm_handle_t *handle, alpm_list_t **data) { alpm_list_t *lp; alpm_trans_t *trans = handle->trans; alpm_db_t *db = handle->db_local; if((trans->flags & ALPM_TRANS_FLAG_RECURSE) && !(trans->flags & ALPM_TRANS_FLAG_CASCADE)) { _alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n"); _alpm_recursedeps(db, trans->remove, trans->flags & ALPM_TRANS_FLAG_RECURSEALL); } if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) { EVENT(trans, ALPM_TRANS_EVT_CHECKDEPS_START, NULL, NULL); _alpm_log(handle, ALPM_LOG_DEBUG, "looking for unsatisfied dependencies\n"); lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(db), trans->remove, NULL, 1); if(lp != NULL) { if(trans->flags & ALPM_TRANS_FLAG_CASCADE) { remove_prepare_cascade(handle, lp); } else if(trans->flags & ALPM_TRANS_FLAG_UNNEEDED) { /* Remove needed packages (which would break dependencies) * from target list */ remove_prepare_keep_needed(handle, lp); } else { if(data) { *data = lp; } else { alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free); alpm_list_free(lp); } RET_ERR(handle, ALPM_ERR_UNSATISFIED_DEPS, -1); } } } /* re-order w.r.t. dependencies */ _alpm_log(handle, ALPM_LOG_DEBUG, "sorting by dependencies\n"); lp = _alpm_sortbydeps(handle, trans->remove, 1); /* free the old alltargs */ alpm_list_free(trans->remove); trans->remove = lp; /* -Rcs == -Rc then -Rs */ if((trans->flags & ALPM_TRANS_FLAG_CASCADE) && (trans->flags & ALPM_TRANS_FLAG_RECURSE)) { _alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n"); _alpm_recursedeps(db, trans->remove, trans->flags & ALPM_TRANS_FLAG_RECURSEALL); } if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) { EVENT(trans, ALPM_TRANS_EVT_CHECKDEPS_DONE, NULL, NULL); } return 0; } static int can_remove_file(alpm_handle_t *handle, const alpm_file_t *file, alpm_list_t *skip_remove) { char filepath[PATH_MAX]; snprintf(filepath, PATH_MAX, "%s%s", handle->root, file->name); if(alpm_list_find_str(skip_remove, filepath)) { /* return success because we will never actually remove this file */ return 1; } /* If we fail write permissions due to a read-only filesystem, abort. * Assume all other possible failures are covered somewhere else */ if(_alpm_access(handle, NULL, filepath, W_OK) == -1) { if(errno != EACCES && errno != ETXTBSY && access(filepath, F_OK) == 0) { /* only return failure if the file ACTUALLY exists and we can't write to * it - ignore "chmod -w" simple permission failures */ _alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove file '%s': %s\n"), filepath, strerror(errno)); return 0; } } return 1; } /* Helper function for iterating through a package's file and deleting them * Used by _alpm_remove_commit. */ static int unlink_file(alpm_handle_t *handle, alpm_pkg_t *info, const alpm_file_t *fileobj, alpm_list_t *skip_remove, int nosave) { struct stat buf; char file[PATH_MAX]; snprintf(file, PATH_MAX, "%s%s", handle->root, fileobj->name); /* check the remove skip list before removing the file. * see the big comment block in db_find_fileconflicts() for an * explanation. */ if(alpm_list_find_str(skip_remove, fileobj->name)) { _alpm_log(handle, ALPM_LOG_DEBUG, "%s is in skip_remove, skipping removal\n", file); return 1; } /* we want to do a lstat here, and not a _alpm_lstat. * if a directory in the package is actually a directory symlink on the * filesystem, we want to work with the linked directory instead of the * actual symlink */ if(lstat(file, &buf)) { _alpm_log(handle, ALPM_LOG_DEBUG, "file %s does not exist\n", file); return 1; } if(S_ISDIR(buf.st_mode)) { ssize_t files = _alpm_files_in_directory(handle, file, 0); /* if we have files, no need to remove the directory */ if(files > 0) { _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (contains files)\n", file); } else if(files < 0) { _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (could not count files)\n", file); } else { /* one last check- does any other package own this file? */ alpm_list_t *local, *local_pkgs; int found = 0; local_pkgs = _alpm_db_get_pkgcache(handle->db_local); for(local = local_pkgs; local && !found; local = local->next) { alpm_pkg_t *local_pkg = local->data; alpm_filelist_t *filelist; /* we duplicated the package when we put it in the removal list, so we * so we can't use direct pointer comparison here. */ if(_alpm_pkg_cmp(info, local_pkg) == 0) { continue; } filelist = alpm_pkg_get_files(local_pkg); if(_alpm_filelist_contains(filelist, fileobj->name)) { _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (owned by %s)\n", file, local_pkg->name); found = 1; } } if(!found) { if(rmdir(file)) { _alpm_log(handle, ALPM_LOG_DEBUG, "directory removal of %s failed: %s\n", file, strerror(errno)); return -1; } else { _alpm_log(handle, ALPM_LOG_DEBUG, "removed directory %s (no remaining owners)\n", file); } } } } else { /* if the file needs backup and has been modified, back it up to .pacsave */ alpm_backup_t *backup = _alpm_needbackup(fileobj->name, info); if(backup) { if(nosave) { _alpm_log(handle, ALPM_LOG_DEBUG, "transaction is set to NOSAVE, not backing up '%s'\n", file); } else { char *filehash = alpm_compute_md5sum(file); int cmp = filehash ? strcmp(filehash, backup->hash) : 0; FREE(filehash); if(cmp != 0) { char newpath[PATH_MAX]; snprintf(newpath, PATH_MAX, "%s.pacsave", file); if(rename(file, newpath)) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"), file, newpath, strerror(errno)); alpm_logaction(handle, "error: could not rename %s to %s (%s)\n", file, newpath, strerror(errno)); return -1; } _alpm_log(handle, ALPM_LOG_WARNING, _("%s saved as %s\n"), file, newpath); alpm_logaction(handle, "warning: %s saved as %s\n", file, newpath); return 0; } } } _alpm_log(handle, ALPM_LOG_DEBUG, "unlinking %s\n", file); if(unlink(file) == -1) { _alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove %s (%s)\n"), file, strerror(errno)); alpm_logaction(handle, "error: cannot remove %s (%s)\n", file, strerror(errno)); return -1; } } return 0; } int _alpm_remove_single_package(alpm_handle_t *handle, alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg, size_t targ_count, size_t pkg_count) { alpm_list_t *skip_remove; size_t filenum = 0, position = 0; const char *pkgname = oldpkg->name; const char *pkgver = oldpkg->version; alpm_filelist_t *filelist; char scriptlet[PATH_MAX]; size_t i; if(newpkg) { _alpm_log(handle, ALPM_LOG_DEBUG, "removing old package first (%s-%s)\n", pkgname, pkgver); } else { EVENT(handle->trans, ALPM_TRANS_EVT_REMOVE_START, oldpkg, NULL); _alpm_log(handle, ALPM_LOG_DEBUG, "removing package %s-%s\n", pkgname, pkgver); snprintf(scriptlet, PATH_MAX, "%s%s-%s/install", _alpm_db_path(handle->db_local), pkgname, pkgver); /* run the pre-remove scriptlet if it exists */ if(alpm_pkg_has_scriptlet(oldpkg) && !(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) { _alpm_runscriptlet(handle, scriptlet, "pre_remove", pkgver, NULL); } } if(handle->trans->flags & ALPM_TRANS_FLAG_DBONLY) { goto db; } if(newpkg) { alpm_filelist_t *newfiles; alpm_list_t *b; skip_remove = alpm_list_join( alpm_list_strdup(handle->trans->skip_remove), alpm_list_strdup(handle->noupgrade)); /* Add files in the NEW backup array to the skip_remove array * so this removal operation doesn't kill them */ /* old package backup list */ newfiles = alpm_pkg_get_files(newpkg); for(b = alpm_pkg_get_backup(newpkg); b; b = b->next) { const alpm_backup_t *backup = b->data; /* safety check (fix the upgrade026 pactest) */ if(!_alpm_filelist_contains(newfiles, backup->name)) { continue; } _alpm_log(handle, ALPM_LOG_DEBUG, "adding %s to the skip_remove array\n", backup->name); skip_remove = alpm_list_add(skip_remove, strdup(backup->name)); } } else { skip_remove = alpm_list_strdup(handle->trans->skip_remove); } filelist = alpm_pkg_get_files(oldpkg); for(i = 0; i < filelist->count; i++) { alpm_file_t *file = filelist->files + i; if(!can_remove_file(handle, file, skip_remove)) { _alpm_log(handle, ALPM_LOG_DEBUG, "not removing package '%s', can't remove all files\n", pkgname); RET_ERR(handle, ALPM_ERR_PKG_CANT_REMOVE, -1); } filenum++; } _alpm_log(handle, ALPM_LOG_DEBUG, "removing %ld files\n", (unsigned long)filenum); if(!newpkg) { /* init progress bar, but only on true remove transactions */ PROGRESS(handle->trans, ALPM_TRANS_PROGRESS_REMOVE_START, pkgname, 0, pkg_count, targ_count); } /* iterate through the list backwards, unlinking files */ for(i = filelist->count; i > 0; i--) { alpm_file_t *file = filelist->files + i - 1; int percent; /* TODO: check return code and handle accordingly */ unlink_file(handle, oldpkg, file, skip_remove, handle->trans->flags & ALPM_TRANS_FLAG_NOSAVE); if(!newpkg) { /* update progress bar after each file */ percent = (position * 100) / filenum; PROGRESS(handle->trans, ALPM_TRANS_PROGRESS_REMOVE_START, pkgname, percent, pkg_count, targ_count); } position++; } FREELIST(skip_remove); if(!newpkg) { /* set progress to 100% after we finish unlinking files */ PROGRESS(handle->trans, ALPM_TRANS_PROGRESS_REMOVE_START, pkgname, 100, pkg_count, targ_count); /* run the post-remove script if it exists */ if(alpm_pkg_has_scriptlet(oldpkg) && !(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) { _alpm_runscriptlet(handle, scriptlet, "post_remove", pkgver, NULL); } } db: /* remove the package from the database */ _alpm_log(handle, ALPM_LOG_DEBUG, "updating database\n"); _alpm_log(handle, ALPM_LOG_DEBUG, "removing database entry '%s'\n", pkgname); if(_alpm_local_db_remove(handle->db_local, oldpkg) == -1) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove database entry %s-%s\n"), pkgname, pkgver); } /* remove the package from the cache */ if(_alpm_db_remove_pkgfromcache(handle->db_local, oldpkg) == -1) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove entry '%s' from cache\n"), pkgname); } if(!newpkg) { /* TODO: awesome! we're passing invalid pointers. */ EVENT(handle->trans, ALPM_TRANS_EVT_REMOVE_DONE, oldpkg, NULL); } return 0; } int _alpm_remove_packages(alpm_handle_t *handle) { alpm_list_t *targ; size_t pkg_count, targ_count; alpm_trans_t *trans = handle->trans; int ret = 0; pkg_count = alpm_list_count(trans->remove); targ_count = 1; for(targ = trans->remove; targ; targ = targ->next) { alpm_pkg_t *pkg = targ->data; if(trans->state == STATE_INTERRUPTED) { return 0; } if(_alpm_remove_single_package(handle, pkg, NULL, targ_count, pkg_count) == -1) { handle->pm_errno = ALPM_ERR_TRANS_ABORT; ret = -1; goto cleanup; } targ_count++; } /* run ldconfig if it exists */ _alpm_ldconfig(handle); cleanup: return ret; } /* vim: set ts=2 sw=2 noet: */