/* * remove.c * * Copyright (c) 2006-2016 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 <stdlib.h> #include <errno.h> #include <string.h> #include <limits.h> #include <dirent.h> #include <regex.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.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 "filelist.h" /** * @brief Add a package removal action to the transaction. * * @param handle the context handle * @param pkg the package to uninstall * * @return 0 on success, -1 on error */ int SYMEXPORT alpm_remove_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg) { const char *pkgname; alpm_trans_t *trans; alpm_pkg_t *copy; /* Sanity checks */ CHECK_HANDLE(handle, return -1); ASSERT(pkg != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1)); ASSERT(pkg->origin == ALPM_PKG_FROM_LOCALDB, 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); if(_alpm_pkg_dup(pkg, ©) == -1) { return -1; } trans->remove = alpm_list_add(trans->remove, copy); return 0; } /** * @brief Add dependencies to the removal transaction for cascading. * * @param handle the context handle * @param lp list of missing dependencies caused by the removal transaction * * @return 0 on success, -1 on error */ static int 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) { alpm_pkg_t *copy; if(!alpm_pkg_find(trans->remove, info->name)) { _alpm_log(handle, ALPM_LOG_DEBUG, "pulling %s in target list\n", info->name); if(_alpm_pkg_dup(info, ©) == -1) { return -1; } trans->remove = alpm_list_add(trans->remove, copy); } } 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_depmissing_free); alpm_list_free(lp); lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local), trans->remove, NULL, 1); } return 0; } /** * @brief Remove needed packages from the removal transaction. * * @param handle the context handle * @param lp list of missing dependencies caused by the removal transaction */ 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"), pkg->name); _alpm_pkg_free(pkg); } } alpm_list_free_inner(lp, (alpm_list_fn_free)alpm_depmissing_free); alpm_list_free(lp); lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local), trans->remove, NULL, 1); } } /** * @brief Send a callback for any optdepend being removed. * * @param handle the context handle * @param lp list of packages to be removed */ static void remove_notify_needed_optdepends(alpm_handle_t *handle, alpm_list_t *lp) { alpm_list_t *i; for(i = _alpm_db_get_pkgcache(handle->db_local); i; i = alpm_list_next(i)) { alpm_pkg_t *pkg = i->data; alpm_list_t *optdeps = alpm_pkg_get_optdepends(pkg); if(optdeps && !alpm_pkg_find(lp, pkg->name)) { alpm_list_t *j; for(j = optdeps; j; j = alpm_list_next(j)) { alpm_depend_t *optdep = j->data; char *optstring = alpm_dep_compute_string(optdep); if(alpm_find_satisfier(lp, optstring)) { alpm_event_optdep_removal_t event = { .type = ALPM_EVENT_OPTDEP_REMOVAL, .pkg = pkg, .optdep = optdep }; EVENT(handle, &event); } free(optstring); } } } } /** * @brief 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 * * @return 0 on success, -1 on error */ 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; alpm_event_t event; if((trans->flags & ALPM_TRANS_FLAG_RECURSE) && !(trans->flags & ALPM_TRANS_FLAG_CASCADE)) { _alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n"); if(_alpm_recursedeps(db, &trans->remove, trans->flags & ALPM_TRANS_FLAG_RECURSEALL)) { return -1; } } if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) { event.type = ALPM_EVENT_CHECKDEPS_START; EVENT(handle, &event); _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) { if(remove_prepare_cascade(handle, lp)) { return -1; } } 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_depmissing_free); alpm_list_free(lp); } RET_ERR(handle, ALPM_ERR_UNSATISFIED_DEPS, -1); } } } /* -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"); if(_alpm_recursedeps(db, &trans->remove, trans->flags & ALPM_TRANS_FLAG_RECURSEALL)) { return -1; } } /* Note packages being removed that are optdepends for installed packages */ if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) { remove_notify_needed_optdepends(handle, trans->remove); } if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) { event.type = ALPM_EVENT_CHECKDEPS_DONE; EVENT(handle, &event); } return 0; } /** * @brief Test if a directory is being used as a mountpoint. * * @param handle context handle * @param directory path to test, must be absolute and include trailing '/' * @param stbuf stat result for @a directory, may be NULL * * @return 0 if @a directory is not a mountpoint or on error, 1 if @a directory * is a mountpoint */ static int dir_is_mountpoint(alpm_handle_t *handle, const char *directory, const struct stat *stbuf) { char parent_dir[PATH_MAX]; struct stat parent_stbuf; dev_t dir_st_dev; if(stbuf == NULL) { struct stat dir_stbuf; if(stat(directory, &dir_stbuf) < 0) { _alpm_log(handle, ALPM_LOG_DEBUG, "failed to stat directory %s: %s\n", directory, strerror(errno)); return 0; } dir_st_dev = dir_stbuf.st_dev; } else { dir_st_dev = stbuf->st_dev; } snprintf(parent_dir, PATH_MAX, "%s..", directory); if(stat(parent_dir, &parent_stbuf) < 0) { _alpm_log(handle, ALPM_LOG_DEBUG, "failed to stat parent of %s: %s: %s\n", directory, parent_dir, strerror(errno)); return 0; } return dir_st_dev != parent_stbuf.st_dev; } /** * @brief Check if alpm can delete a file. * * @param handle the context handle * @param file file to be removed * * @return 1 if the file can be deleted, 0 if it cannot be deleted */ static int can_remove_file(alpm_handle_t *handle, const alpm_file_t *file) { char filepath[PATH_MAX]; snprintf(filepath, PATH_MAX, "%s%s", handle->root, file->name); if(file->name[strlen(file->name) - 1] == '/' && dir_is_mountpoint(handle, filepath, NULL)) { /* we do not remove mountpoints */ 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; } static void shift_pacsave(alpm_handle_t *handle, const char *file) { DIR *dir = NULL; struct dirent *ent; struct stat st; regex_t reg; const char *basename; char *dirname; char oldfile[PATH_MAX]; char newfile[PATH_MAX]; char regstr[PATH_MAX]; unsigned long log_max = 0; size_t basename_len; dirname = mdirname(file); if(!dirname) { return; } basename = mbasename(file); basename_len = strlen(basename); snprintf(regstr, PATH_MAX, "^%s\\.pacsave\\.([[:digit:]]+)$", basename); if(regcomp(®, regstr, REG_EXTENDED | REG_NEWLINE) != 0) { goto cleanup; } dir = opendir(dirname); if(dir == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not open directory: %s: %s\n"), dirname, strerror(errno)); goto cleanup; } while((ent = readdir(dir)) != NULL) { if(strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) { continue; } if(regexec(®, ent->d_name, 0, 0, 0) == 0) { unsigned long cur_log; cur_log = strtoul(ent->d_name + basename_len + strlen(".pacsave."), NULL, 10); if(cur_log > log_max) { log_max = cur_log; } } } /* Shift pacsaves */ unsigned long i; for(i = log_max + 1; i > 1; i--) { snprintf(oldfile, PATH_MAX, "%s.pacsave.%lu", file, i-1); snprintf(newfile, PATH_MAX, "%s.pacsave.%lu", file, i); rename(oldfile, newfile); } snprintf(oldfile, PATH_MAX, "%s.pacsave", file); if(stat(oldfile, &st) == 0) { snprintf(newfile, PATH_MAX, "%s.1", oldfile); rename(oldfile, newfile); } regfree(®); cleanup: free(dirname); closedir(dir); } /** * @brief Unlink a package file, backing it up if necessary. * * @param handle the context handle * @param oldpkg the package being removed * @param newpkg the package replacing \a oldpkg * @param fileobj file to remove * @param nosave whether files should be backed up * * @return 0 on success, -1 if there was an error unlinking the file, 1 if the * file was skipped or did not exist */ static int unlink_file(alpm_handle_t *handle, alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg, const alpm_file_t *fileobj, int nosave) { struct stat buf; char file[PATH_MAX]; snprintf(file, PATH_MAX, "%s%s", handle->root, fileobj->name); if(llstat(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 if(newpkg && alpm_filelist_contains(alpm_pkg_get_files(newpkg), fileobj->name)) { _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (in new package)\n", file); } else if(dir_is_mountpoint(handle, file, &buf)) { _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s (mountpoint)\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(oldpkg->name_hash == local_pkg->name_hash && strcmp(oldpkg->name, local_pkg->name) == 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, oldpkg); 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) { alpm_event_pacsave_created_t event = { .type = ALPM_EVENT_PACSAVE_CREATED, .oldpkg = oldpkg, .file = file }; char *newpath; size_t len = strlen(file) + 8 + 1; MALLOC(newpath, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); shift_pacsave(handle, file); snprintf(newpath, len, "%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, ALPM_CALLER_PREFIX, "error: could not rename %s to %s (%s)\n", file, newpath, strerror(errno)); free(newpath); return -1; } EVENT(handle, &event); alpm_logaction(handle, ALPM_CALLER_PREFIX, "warning: %s saved as %s\n", file, newpath); free(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, ALPM_CALLER_PREFIX, "error: cannot remove %s (%s)\n", file, strerror(errno)); return -1; } } return 0; } /** * @brief Check if a package file should be removed. * * @param handle the context handle * @param newpkg the package replacing the current owner of \a path * @param path file to be removed * * @return 1 if the file should be skipped, 0 if it should be removed */ static int should_skip_file(alpm_handle_t *handle, alpm_pkg_t *newpkg, const char *path) { return _alpm_fnmatch_patterns(handle->noupgrade, path) == 0 || alpm_list_find_str(handle->trans->skip_remove, path) || (newpkg && _alpm_needbackup(path, newpkg) && alpm_filelist_contains(alpm_pkg_get_files(newpkg), path)); } /** * @brief Remove a package's files, optionally skipping its replacement's * files. * * @param handle the context handle * @param oldpkg package to remove * @param newpkg package to replace \a oldpkg (optional) * @param targ_count current index within the transaction (1-based) * @param pkg_count the number of packages affected by the transaction * * @return 0 on success, -1 if alpm lacks permission to delete some of the * files, >0 the number of files alpm was unable to delete */ static int remove_package_files(alpm_handle_t *handle, alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg, size_t targ_count, size_t pkg_count) { alpm_filelist_t *filelist; size_t i; int err = 0; int nosave = handle->trans->flags & ALPM_TRANS_FLAG_NOSAVE; filelist = alpm_pkg_get_files(oldpkg); for(i = 0; i < filelist->count; i++) { alpm_file_t *file = filelist->files + i; if(!should_skip_file(handle, newpkg, file->name) && !can_remove_file(handle, file)) { _alpm_log(handle, ALPM_LOG_DEBUG, "not removing package '%s', can't remove all files\n", oldpkg->name); RET_ERR(handle, ALPM_ERR_PKG_CANT_REMOVE, -1); } } _alpm_log(handle, ALPM_LOG_DEBUG, "removing %zu files\n", filelist->count); if(!newpkg) { /* init progress bar, but only on true remove transactions */ PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name, 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; /* check the remove skip list before removing the file. * see the big comment block in db_find_fileconflicts() for an * explanation. */ if(should_skip_file(handle, newpkg, file->name)) { _alpm_log(handle, ALPM_LOG_DEBUG, "%s is in skip_remove, skipping removal\n", file->name); continue; } if(unlink_file(handle, oldpkg, newpkg, file, nosave) < 0) { err++; } if(!newpkg) { /* update progress bar after each file */ int percent = ((filelist->count - i) * 100) / filelist->count; PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name, percent, pkg_count, targ_count); } } if(!newpkg) { /* set progress to 100% after we finish unlinking files */ PROGRESS(handle, ALPM_PROGRESS_REMOVE_START, oldpkg->name, 100, pkg_count, targ_count); } return err; } /** * @brief Remove a package from the filesystem. * * @param handle the context handle * @param oldpkg package to remove * @param newpkg package to replace \a oldpkg (optional) * @param targ_count current index within the transaction (1-based) * @param pkg_count the number of packages affected by the transaction * * @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) { const char *pkgname = oldpkg->name; const char *pkgver = oldpkg->version; alpm_event_package_operation_t event = { .type = ALPM_EVENT_PACKAGE_OPERATION_START, .operation = ALPM_PACKAGE_REMOVE, .oldpkg = oldpkg, .newpkg = NULL }; if(newpkg) { _alpm_log(handle, ALPM_LOG_DEBUG, "removing old package first (%s-%s)\n", pkgname, pkgver); } else { EVENT(handle, &event); _alpm_log(handle, ALPM_LOG_DEBUG, "removing package %s-%s\n", pkgname, pkgver); /* run the pre-remove scriptlet if it exists */ if(alpm_pkg_has_scriptlet(oldpkg) && !(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) { char *scriptlet = _alpm_local_db_pkgpath(handle->db_local, oldpkg, "install"); _alpm_runscriptlet(handle, scriptlet, "pre_remove", pkgver, NULL, 0); free(scriptlet); } } if(!(handle->trans->flags & ALPM_TRANS_FLAG_DBONLY)) { /* TODO check returned errors if any */ remove_package_files(handle, oldpkg, newpkg, targ_count, pkg_count); } if(!newpkg) { alpm_logaction(handle, ALPM_CALLER_PREFIX, "removed %s (%s)\n", oldpkg->name, oldpkg->version); } /* run the post-remove script if it exists */ if(!newpkg && alpm_pkg_has_scriptlet(oldpkg) && !(handle->trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) { char *scriptlet = _alpm_local_db_pkgpath(handle->db_local, oldpkg, "install"); _alpm_runscriptlet(handle, scriptlet, "post_remove", pkgver, NULL, 0); free(scriptlet); } if(!newpkg) { event.type = ALPM_EVENT_PACKAGE_OPERATION_DONE; EVENT(handle, &event); } /* remove the package from the database */ _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); } /* TODO: useful return values */ return 0; } /** * @brief Remove packages in the current transaction. * * @param handle the context handle * @param run_ldconfig whether to run ld_config after removing the packages * * @return 0 on success, -1 if errors occurred while removing files */ int _alpm_remove_packages(alpm_handle_t *handle, int run_ldconfig) { 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 ret; } if(_alpm_remove_single_package(handle, pkg, NULL, targ_count, pkg_count) == -1) { handle->pm_errno = ALPM_ERR_TRANS_ABORT; /* running ldconfig at this point could possibly screw system */ run_ldconfig = 0; ret = -1; } targ_count++; } if(run_ldconfig) { /* run ldconfig if it exists */ _alpm_ldconfig(handle); } return ret; } /* vim: set noet: */