lib/libalpm/remove.c

   1 /*
   2  *  remove.c
   3  *
   4  *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
   5  *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
   6  *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
   7  *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
   8  *  Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
   9  *  Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <limits.h>
  31 #include <unistd.h>
  32 #include <sys/stat.h>
  33
  34 /* libalpm */
  35 #include "remove.h"
  36 #include "alpm_list.h"
  37 #include "alpm.h"
  38 #include "trans.h"
  39 #include "util.h"
  40 #include "log.h"
  41 #include "backup.h"
  42 #include "package.h"
  43 #include "db.h"
  44 #include "deps.h"
  45 #include "handle.h"
  46
  47 int SYMEXPORT alpm_remove_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg)
  48 {
  49         const char *pkgname;
  50         alpm_trans_t *trans;
  51
  52         /* Sanity checks */
  53         CHECK_HANDLE(handle, return -1);
  54         ASSERT(pkg != NULL, RET_ERR(handle, PM_ERR_WRONG_ARGS, -1));
  55         ASSERT(handle == pkg->handle, RET_ERR(handle, PM_ERR_WRONG_ARGS, -1));
  56         trans = handle->trans;
  57         ASSERT(trans != NULL, RET_ERR(handle, PM_ERR_TRANS_NULL, -1));
  58         ASSERT(trans->state == STATE_INITIALIZED,
  59                         RET_ERR(handle, PM_ERR_TRANS_NOT_INITIALIZED, -1));
  60
  61         pkgname = pkg->name;
  62
  63         if(_alpm_pkg_find(trans->remove, pkgname)) {
  64                 RET_ERR(handle, PM_ERR_TRANS_DUP_TARGET, -1);
  65         }
  66
  67         _alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s to the transaction remove list\n",
  68                         pkgname);
  69         trans->remove = alpm_list_add(trans->remove, _alpm_pkg_dup(pkg));
  70         return 0;
  71 }
  72
  73 static void remove_prepare_cascade(alpm_handle_t *handle, alpm_list_t *lp)
  74 {
  75         alpm_trans_t *trans = handle->trans;
  76
  77         while(lp) {
  78                 alpm_list_t *i;
  79                 for(i = lp; i; i = i->next) {
  80                         alpm_depmissing_t *miss = (alpm_depmissing_t *)i->data;
  81                         alpm_pkg_t *info = _alpm_db_get_pkgfromcache(handle->db_local, miss->target);
  82                         if(info) {
  83                                 if(!_alpm_pkg_find(trans->remove, alpm_pkg_get_name(info))) {
  84                                         _alpm_log(handle, ALPM_LOG_DEBUG, "pulling %s in target list\n",
  85                                                         alpm_pkg_get_name(info));
  86                                         trans->remove = alpm_list_add(trans->remove, _alpm_pkg_dup(info));
  87                                 }
  88                         } else {
  89                                 _alpm_log(handle, ALPM_LOG_ERROR, _("could not find %s in database -- skipping\n"),
  90                                                                         miss->target);
  91                         }
  92                 }
  93                 alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
  94                 alpm_list_free(lp);
  95                 lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local),
  96                                 trans->remove, NULL, 1);
  97         }
  98 }
  99
 100 static void remove_prepare_keep_needed(alpm_handle_t *handle, alpm_list_t *lp)
 101 {
 102         alpm_trans_t *trans = handle->trans;
 103
 104         /* Remove needed packages (which break dependencies) from target list */
 105         while(lp != NULL) {
 106                 alpm_list_t *i;
 107                 for(i = lp; i; i = i->next) {
 108                         alpm_depmissing_t *miss = (alpm_depmissing_t *)i->data;
 109                         void *vpkg;
 110                         alpm_pkg_t *pkg = _alpm_pkg_find(trans->remove, miss->causingpkg);
 111                         if(pkg == NULL) {
 112                                 continue;
 113                         }
 114                         trans->remove = alpm_list_remove(trans->remove, pkg, _alpm_pkg_cmp,
 115                                         &vpkg);
 116                         pkg = vpkg;
 117                         if(pkg) {
 118                                 _alpm_log(handle, ALPM_LOG_WARNING, _("removing %s from target list\n"),
 119                                                 alpm_pkg_get_name(pkg));
 120                                 _alpm_pkg_free(pkg);
 121                         }
 122                 }
 123                 alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
 124                 alpm_list_free(lp);
 125                 lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(handle->db_local),
 126                                 trans->remove, NULL, 1);
 127         }
 128 }
 129
 130 /** Transaction preparation for remove actions.
 131  * This functions takes a pointer to a alpm_list_t which will be
 132  * filled with a list of alpm_depmissing_t* objects representing
 133  * the packages blocking the transaction.
 134  * @param handle the context handle
 135  * @param data a pointer to an alpm_list_t* to fill
 136  */
 137 int _alpm_remove_prepare(alpm_handle_t *handle, alpm_list_t **data)
 138 {
 139         alpm_list_t *lp;
 140         alpm_trans_t *trans = handle->trans;
 141         alpm_db_t *db = handle->db_local;
 142
 143         if((trans->flags & ALPM_TRANS_FLAG_RECURSE) && !(trans->flags & ALPM_TRANS_FLAG_CASCADE)) {
 144                 _alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n");
 145                 _alpm_recursedeps(db, trans->remove,
 146                                 trans->flags & ALPM_TRANS_FLAG_RECURSEALL);
 147         }
 148
 149         if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
 150                 EVENT(trans, PM_TRANS_EVT_CHECKDEPS_START, NULL, NULL);
 151
 152                 _alpm_log(handle, ALPM_LOG_DEBUG, "looking for unsatisfied dependencies\n");
 153                 lp = alpm_checkdeps(handle, _alpm_db_get_pkgcache(db), trans->remove, NULL, 1);
 154                 if(lp != NULL) {
 155
 156                         if(trans->flags & ALPM_TRANS_FLAG_CASCADE) {
 157                                 remove_prepare_cascade(handle, lp);
 158                         } else if(trans->flags & ALPM_TRANS_FLAG_UNNEEDED) {
 159                                 /* Remove needed packages (which would break dependencies)
 160                                  * from target list */
 161                                 remove_prepare_keep_needed(handle, lp);
 162                         } else {
 163                                 if(data) {
 164                                         *data = lp;
 165                                 } else {
 166                                         alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
 167                                         alpm_list_free(lp);
 168                                 }
 169                                 RET_ERR(handle, PM_ERR_UNSATISFIED_DEPS, -1);
 170                         }
 171                 }
 172         }
 173
 174         /* re-order w.r.t. dependencies */
 175         _alpm_log(handle, ALPM_LOG_DEBUG, "sorting by dependencies\n");
 176         lp = _alpm_sortbydeps(handle, trans->remove, 1);
 177         /* free the old alltargs */
 178         alpm_list_free(trans->remove);
 179         trans->remove = lp;
 180
 181         /* -Rcs == -Rc then -Rs */
 182         if((trans->flags & ALPM_TRANS_FLAG_CASCADE) && (trans->flags & ALPM_TRANS_FLAG_RECURSE)) {
 183                 _alpm_log(handle, ALPM_LOG_DEBUG, "finding removable dependencies\n");
 184                 _alpm_recursedeps(db, trans->remove, trans->flags & ALPM_TRANS_FLAG_RECURSEALL);
 185         }
 186
 187         if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
 188                 EVENT(trans, PM_TRANS_EVT_CHECKDEPS_DONE, NULL, NULL);
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int can_remove_file(alpm_handle_t *handle, const char *path,
 195                 alpm_list_t *skip_remove)
 196 {
 197         char file[PATH_MAX];
 198
 199         snprintf(file, PATH_MAX, "%s%s", handle->root, path);
 200
 201         if(alpm_list_find_str(skip_remove, file)) {
 202                 /* return success because we will never actually remove this file */
 203                 return 1;
 204         }
 205         /* If we fail write permissions due to a read-only filesystem, abort.
 206          * Assume all other possible failures are covered somewhere else */
 207         if(access(file, W_OK) == -1) {
 208                 if(errno != EACCES && errno != ETXTBSY && access(file, F_OK) == 0) {
 209                         /* only return failure if the file ACTUALLY exists and we can't write to
 210                          * it - ignore "chmod -w" simple permission failures */
 211                         _alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove file '%s': %s\n"),
 212                                         file, strerror(errno));
 213                         return 0;
 214                 }
 215         }
 216
 217         return 1;
 218 }
 219
 220 /* Helper function for iterating through a package's file and deleting them
 221  * Used by _alpm_remove_commit. */
 222 static void unlink_file(alpm_handle_t *handle, alpm_pkg_t *info, const char *filename,
 223                 alpm_list_t *skip_remove, int nosave)
 224 {
 225         struct stat buf;
 226         char file[PATH_MAX];
 227
 228         snprintf(file, PATH_MAX, "%s%s", handle->root, filename);
 229
 230         /* check the remove skip list before removing the file.
 231          * see the big comment block in db_find_fileconflicts() for an
 232          * explanation. */
 233         if(alpm_list_find_str(skip_remove, filename)) {
 234                 _alpm_log(handle, ALPM_LOG_DEBUG, "%s is in skip_remove, skipping removal\n",
 235                                 file);
 236                 return;
 237         }
 238
 239         /* we want to do a lstat here, and not a _alpm_lstat.
 240          * if a directory in the package is actually a directory symlink on the
 241          * filesystem, we want to work with the linked directory instead of the
 242          * actual symlink */
 243         if(lstat(file, &buf)) {
 244                 _alpm_log(handle, ALPM_LOG_DEBUG, "file %s does not exist\n", file);
 245                 return;
 246         }
 247
 248         if(S_ISDIR(buf.st_mode)) {
 249                 if(rmdir(file)) {
 250                         /* this is okay, other packages are probably using it (like /usr) */
 251                         _alpm_log(handle, ALPM_LOG_DEBUG, "keeping directory %s\n", file);
 252                 } else {
 253                         _alpm_log(handle, ALPM_LOG_DEBUG, "removing directory %s\n", file);
 254                 }
 255         } else {
 256                 /* if the file needs backup and has been modified, back it up to .pacsave */
 257                 alpm_backup_t *backup = _alpm_needbackup(filename, alpm_pkg_get_backup(info));
 258                 if(backup) {
 259                         if(nosave) {
 260                                 _alpm_log(handle, ALPM_LOG_DEBUG, "transaction is set to NOSAVE, not backing up '%s'\n", file);
 261                         } else {
 262                                 char *filehash = alpm_compute_md5sum(file);
 263                                 int cmp = filehash ? strcmp(filehash, backup->hash) : 0;
 264                                 FREE(filehash);
 265                                 if(cmp != 0) {
 266                                         char newpath[PATH_MAX];
 267                                         snprintf(newpath, PATH_MAX, "%s.pacsave", file);
 268                                         rename(file, newpath);
 269                                         _alpm_log(handle, ALPM_LOG_WARNING, _("%s saved as %s\n"), file, newpath);
 270                                         alpm_logaction(handle, "warning: %s saved as %s\n", file, newpath);
 271                                         return;
 272                                 }
 273                         }
 274                 }
 275
 276                 _alpm_log(handle, ALPM_LOG_DEBUG, "unlinking %s\n", file);
 277
 278                 if(unlink(file) == -1) {
 279                         _alpm_log(handle, ALPM_LOG_ERROR, _("cannot remove file '%s': %s\n"),
 280                                         filename, strerror(errno));
 281                 }
 282         }
 283 }
 284
 285 int _alpm_upgraderemove_package(alpm_handle_t *handle,
 286                 alpm_pkg_t *oldpkg, alpm_pkg_t *newpkg)
 287 {
 288         alpm_list_t *skip_remove, *b;
 289         alpm_list_t *newfiles, *lp;
 290         size_t filenum = 0;
 291         alpm_list_t *files = alpm_pkg_get_files(oldpkg);
 292         const char *pkgname = alpm_pkg_get_name(oldpkg);
 293
 294         _alpm_log(handle, ALPM_LOG_DEBUG, "removing old package first (%s-%s)\n",
 295                         oldpkg->name, oldpkg->version);
 296
 297         if(handle->trans->flags & ALPM_TRANS_FLAG_DBONLY) {
 298                 goto db;
 299         }
 300
 301         /* copy the remove skiplist over */
 302         skip_remove = alpm_list_join(
 303                         alpm_list_strdup(handle->trans->skip_remove),
 304                         alpm_list_strdup(handle->noupgrade));
 305         /* Add files in the NEW backup array to the skip_remove array
 306          * so this removal operation doesn't kill them */
 307         /* old package backup list */
 308         alpm_list_t *filelist = alpm_pkg_get_files(newpkg);
 309         for(b = alpm_pkg_get_backup(newpkg); b; b = b->next) {
 310                 const alpm_backup_t *backup = b->data;
 311                 /* safety check (fix the upgrade026 pactest) */
 312                 if(!alpm_list_find_str(filelist, backup->name)) {
 313                         continue;
 314                 }
 315                 _alpm_log(handle, ALPM_LOG_DEBUG, "adding %s to the skip_remove array\n",
 316                                 backup->name);
 317                 skip_remove = alpm_list_add(skip_remove, strdup(backup->name));
 318         }
 319
 320         for(lp = files; lp; lp = lp->next) {
 321                 if(!can_remove_file(handle, lp->data, skip_remove)) {
 322                         _alpm_log(handle, ALPM_LOG_DEBUG,
 323                                         "not removing package '%s', can't remove all files\n", pkgname);
 324                         RET_ERR(handle, PM_ERR_PKG_CANT_REMOVE, -1);
 325                 }
 326                 filenum++;
 327         }
 328
 329         _alpm_log(handle, ALPM_LOG_DEBUG, "removing %ld files\n", (unsigned long)filenum);
 330
 331         /* iterate through the list backwards, unlinking files */
 332         newfiles = alpm_list_reverse(files);
 333         for(lp = newfiles; lp; lp = alpm_list_next(lp)) {
 334                 unlink_file(handle, oldpkg, lp->data, skip_remove, 0);
 335         }
 336         alpm_list_free(newfiles);
 337         FREELIST(skip_remove);
 338
 339 db:
 340         /* remove the package from the database */
 341         _alpm_log(handle, ALPM_LOG_DEBUG, "updating database\n");
 342         _alpm_log(handle, ALPM_LOG_DEBUG, "removing database entry '%s'\n", pkgname);
 343         if(_alpm_local_db_remove(handle->db_local, oldpkg) == -1) {
 344                 _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove database entry %s-%s\n"),
 345                                 pkgname, alpm_pkg_get_version(oldpkg));
 346         }
 347         /* remove the package from the cache */
 348         if(_alpm_db_remove_pkgfromcache(handle->db_local, oldpkg) == -1) {
 349                 _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove entry '%s' from cache\n"),
 350                                 pkgname);
 351         }
 352
 353         return 0;
 354 }
 355
 356 int _alpm_remove_packages(alpm_handle_t *handle)
 357 {
 358         alpm_pkg_t *info;
 359         alpm_list_t *targ, *lp;
 360         size_t pkg_count;
 361         alpm_trans_t *trans = handle->trans;
 362
 363         pkg_count = alpm_list_count(trans->remove);
 364
 365         for(targ = trans->remove; targ; targ = targ->next) {
 366                 int position = 0;
 367                 char scriptlet[PATH_MAX];
 368                 info = (alpm_pkg_t *)targ->data;
 369                 const char *pkgname = NULL;
 370                 size_t targcount = alpm_list_count(targ);
 371
 372                 if(trans->state == STATE_INTERRUPTED) {
 373                         return 0;
 374                 }
 375
 376                 /* get the name now so we can use it after package is removed */
 377                 pkgname = alpm_pkg_get_name(info);
 378                 snprintf(scriptlet, PATH_MAX, "%s%s-%s/install",
 379                                 _alpm_db_path(handle->db_local), pkgname, alpm_pkg_get_version(info));
 380
 381                 EVENT(trans, PM_TRANS_EVT_REMOVE_START, info, NULL);
 382                 _alpm_log(handle, ALPM_LOG_DEBUG, "removing package %s-%s\n",
 383                                 pkgname, alpm_pkg_get_version(info));
 384
 385                 /* run the pre-remove scriptlet if it exists  */
 386                 if(alpm_pkg_has_scriptlet(info) && !(trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) {
 387                         _alpm_runscriptlet(handle, scriptlet, "pre_remove",
 388                                         alpm_pkg_get_version(info), NULL);
 389                 }
 390
 391                 if(!(trans->flags & ALPM_TRANS_FLAG_DBONLY)) {
 392                         alpm_list_t *files = alpm_pkg_get_files(info);
 393                         alpm_list_t *newfiles;
 394                         size_t filenum = 0;
 395
 396                         for(lp = files; lp; lp = lp->next) {
 397                                 if(!can_remove_file(handle, lp->data, NULL)) {
 398                                         _alpm_log(handle, ALPM_LOG_DEBUG, "not removing package '%s', can't remove all files\n",
 399                                                   pkgname);
 400                                         RET_ERR(handle, PM_ERR_PKG_CANT_REMOVE, -1);
 401                                 }
 402                                 filenum++;
 403                         }
 404
 405                         _alpm_log(handle, ALPM_LOG_DEBUG, "removing %ld files\n", (unsigned long)filenum);
 406
 407                         /* init progress bar */
 408                         PROGRESS(trans, PM_TRANS_PROGRESS_REMOVE_START, info->name, 0,
 409                                         pkg_count, (pkg_count - targcount + 1));
 410
 411                         /* iterate through the list backwards, unlinking files */
 412                         newfiles = alpm_list_reverse(files);
 413                         for(lp = newfiles; lp; lp = alpm_list_next(lp)) {
 414                                 int percent;
 415                                 unlink_file(handle, info, lp->data, NULL, trans->flags & ALPM_TRANS_FLAG_NOSAVE);
 416
 417                                 /* update progress bar after each file */
 418                                 percent = (position * 100) / filenum;
 419                                 PROGRESS(trans, PM_TRANS_PROGRESS_REMOVE_START, info->name,
 420                                                 percent, pkg_count, (pkg_count - targcount + 1));
 421                                 position++;
 422                         }
 423                         alpm_list_free(newfiles);
 424                 }
 425
 426                 /* set progress to 100% after we finish unlinking files */
 427                 PROGRESS(trans, PM_TRANS_PROGRESS_REMOVE_START, pkgname, 100,
 428                          pkg_count, (pkg_count - targcount + 1));
 429
 430                 /* run the post-remove script if it exists  */
 431                 if(alpm_pkg_has_scriptlet(info) && !(trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) {
 432                         _alpm_runscriptlet(handle, scriptlet, "post_remove",
 433                                         alpm_pkg_get_version(info), NULL);
 434                 }
 435
 436                 /* remove the package from the database */
 437                 _alpm_log(handle, ALPM_LOG_DEBUG, "updating database\n");
 438                 _alpm_log(handle, ALPM_LOG_DEBUG, "removing database entry '%s'\n", pkgname);
 439                 if(_alpm_local_db_remove(handle->db_local, info) == -1) {
 440                         _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove database entry %s-%s\n"),
 441                                   pkgname, alpm_pkg_get_version(info));
 442                 }
 443                 /* remove the package from the cache */
 444                 if(_alpm_db_remove_pkgfromcache(handle->db_local, info) == -1) {
 445                         _alpm_log(handle, ALPM_LOG_ERROR, _("could not remove entry '%s' from cache\n"),
 446                                   pkgname);
 447                 }
 448
 449                 EVENT(trans, PM_TRANS_EVT_REMOVE_DONE, info, NULL);
 450         }
 451
 452         /* run ldconfig if it exists */
 453         _alpm_ldconfig(handle);
 454
 455         return 0;
 456 }
 457
 458 /* vim: set ts=2 sw=2 noet: */