src/shared/install.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty <of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <fnmatch.h>
  27
  28 #include "util.h"
  29 #include "mkdir.h"
  30 #include "hashmap.h"
  31 #include "set.h"
  32 #include "path-util.h"
  33 #include "path-lookup.h"
  34 #include "strv.h"
  35 #include "unit-name.h"
  36 #include "install.h"
  37 #include "conf-parser.h"
  38 #include "conf-files.h"
  39 #include "specifier.h"
  40 #include "install-printf.h"
  41 #include "special.h"
  42
  43 typedef struct {
  44         OrderedHashmap *will_install;
  45         OrderedHashmap *have_installed;
  46 } InstallContext;
  47
  48 static int in_search_path(const char *path, char **search) {
  49         _cleanup_free_ char *parent = NULL;
  50         int r;
  51
  52         assert(path);
  53
  54         r = path_get_parent(path, &parent);
  55         if (r < 0)
  56                 return r;
  57
  58         return strv_contains(search, parent);
  59 }
  60
  61 static int lookup_paths_init_from_scope(LookupPaths *paths,
  62                                         UnitFileScope scope,
  63                                         const char *root_dir) {
  64         assert(paths);
  65         assert(scope >= 0);
  66         assert(scope < _UNIT_FILE_SCOPE_MAX);
  67
  68         zero(*paths);
  69
  70         return lookup_paths_init(paths,
  71                                  scope == UNIT_FILE_SYSTEM ? SYSTEMD_SYSTEM : SYSTEMD_USER,
  72                                  scope == UNIT_FILE_USER,
  73                                  root_dir,
  74                                  NULL, NULL, NULL);
  75 }
  76
  77 static int get_config_path(UnitFileScope scope, bool runtime, const char *root_dir, char **ret) {
  78         char *p = NULL;
  79         int r;
  80
  81         assert(scope >= 0);
  82         assert(scope < _UNIT_FILE_SCOPE_MAX);
  83         assert(ret);
  84
  85         switch (scope) {
  86
  87         case UNIT_FILE_SYSTEM:
  88
  89                 if (runtime)
  90                         p = path_join(root_dir, "/run/systemd/system", NULL);
  91                 else
  92                         p = path_join(root_dir, SYSTEM_CONFIG_UNIT_PATH, NULL);
  93                 break;
  94
  95         case UNIT_FILE_GLOBAL:
  96
  97                 if (root_dir)
  98                         return -EINVAL;
  99
 100                 if (runtime)
 101                         p = strdup("/run/systemd/user");
 102                 else
 103                         p = strdup(USER_CONFIG_UNIT_PATH);
 104                 break;
 105
 106         case UNIT_FILE_USER:
 107
 108                 if (root_dir)
 109                         return -EINVAL;
 110
 111                 if (runtime)
 112                         r = user_runtime_dir(&p);
 113                 else
 114                         r = user_config_home(&p);
 115
 116                 if (r <= 0)
 117                         return r < 0 ? r : -ENOENT;
 118
 119                 break;
 120
 121         default:
 122                 assert_not_reached("Bad scope");
 123         }
 124
 125         if (!p)
 126                 return -ENOMEM;
 127
 128         *ret = p;
 129         return 0;
 130 }
 131
 132 static int add_file_change(
 133                 UnitFileChange **changes,
 134                 unsigned *n_changes,
 135                 UnitFileChangeType type,
 136                 const char *path,
 137                 const char *source) {
 138
 139         UnitFileChange *c;
 140         unsigned i;
 141
 142         assert(path);
 143         assert(!changes == !n_changes);
 144
 145         if (!changes)
 146                 return 0;
 147
 148         c = realloc(*changes, (*n_changes + 1) * sizeof(UnitFileChange));
 149         if (!c)
 150                 return -ENOMEM;
 151
 152         *changes = c;
 153         i = *n_changes;
 154
 155         c[i].type = type;
 156         c[i].path = strdup(path);
 157         if (!c[i].path)
 158                 return -ENOMEM;
 159
 160         path_kill_slashes(c[i].path);
 161
 162         if (source) {
 163                 c[i].source = strdup(source);
 164                 if (!c[i].source) {
 165                         free(c[i].path);
 166                         return -ENOMEM;
 167                 }
 168
 169                 path_kill_slashes(c[i].path);
 170         } else
 171                 c[i].source = NULL;
 172
 173         *n_changes = i+1;
 174         return 0;
 175 }
 176
 177 static int mark_symlink_for_removal(
 178                 Set **remove_symlinks_to,
 179                 const char *p) {
 180
 181         char *n;
 182         int r;
 183
 184         assert(p);
 185
 186         r = set_ensure_allocated(remove_symlinks_to, &string_hash_ops);
 187         if (r < 0)
 188                 return r;
 189
 190         n = strdup(p);
 191         if (!n)
 192                 return -ENOMEM;
 193
 194         path_kill_slashes(n);
 195
 196         r = set_consume(*remove_symlinks_to, n);
 197         if (r < 0)
 198                 return r == -EEXIST ? 0 : r;
 199
 200         return 0;
 201 }
 202
 203 static int remove_marked_symlinks_fd(
 204                 Set *remove_symlinks_to,
 205                 int fd,
 206                 const char *path,
 207                 const char *config_path,
 208                 bool *deleted,
 209                 UnitFileChange **changes,
 210                 unsigned *n_changes,
 211                 char** instance_whitelist) {
 212
 213         _cleanup_closedir_ DIR *d = NULL;
 214         int r = 0;
 215
 216         assert(remove_symlinks_to);
 217         assert(fd >= 0);
 218         assert(path);
 219         assert(config_path);
 220         assert(deleted);
 221
 222         d = fdopendir(fd);
 223         if (!d) {
 224                 safe_close(fd);
 225                 return -errno;
 226         }
 227
 228         rewinddir(d);
 229
 230         for (;;) {
 231                 struct dirent *de;
 232
 233                 errno = 0;
 234                 de = readdir(d);
 235                 if (!de && errno != 0) {
 236                         r = -errno;
 237                         break;
 238                 }
 239
 240                 if (!de)
 241                         break;
 242
 243                 if (ignore_file(de->d_name))
 244                         continue;
 245
 246                 dirent_ensure_type(d, de);
 247
 248                 if (de->d_type == DT_DIR) {
 249                         int nfd, q;
 250                         _cleanup_free_ char *p = NULL;
 251
 252                         nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
 253                         if (nfd < 0) {
 254                                 if (errno == ENOENT)
 255                                         continue;
 256
 257                                 if (r == 0)
 258                                         r = -errno;
 259                                 continue;
 260                         }
 261
 262                         p = path_make_absolute(de->d_name, path);
 263                         if (!p) {
 264                                 safe_close(nfd);
 265                                 return -ENOMEM;
 266                         }
 267
 268                         /* This will close nfd, regardless whether it succeeds or not */
 269                         q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, deleted, changes, n_changes, instance_whitelist);
 270                         if (q < 0 && r == 0)
 271                                 r = q;
 272
 273                 } else if (de->d_type == DT_LNK) {
 274                         _cleanup_free_ char *p = NULL, *dest = NULL;
 275                         int q;
 276                         bool found;
 277
 278                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
 279                                 continue;
 280
 281                         if (unit_name_is_instance(de->d_name) &&
 282                             instance_whitelist &&
 283                             !strv_contains(instance_whitelist, de->d_name)) {
 284
 285                                 _cleanup_free_ char *w;
 286
 287                                 /* OK, the file is not listed directly
 288                                  * in the whitelist, so let's check if
 289                                  * the template of it might be
 290                                  * listed. */
 291
 292                                 w = unit_name_template(de->d_name);
 293                                 if (!w)
 294                                         return -ENOMEM;
 295
 296                                 if (!strv_contains(instance_whitelist, w))
 297                                         continue;
 298                         }
 299
 300                         p = path_make_absolute(de->d_name, path);
 301                         if (!p)
 302                                 return -ENOMEM;
 303
 304                         q = readlink_and_canonicalize(p, &dest);
 305                         if (q < 0) {
 306                                 if (q == -ENOENT)
 307                                         continue;
 308
 309                                 if (r == 0)
 310                                         r = q;
 311                                 continue;
 312                         }
 313
 314                         found =
 315                                 set_get(remove_symlinks_to, dest) ||
 316                                 set_get(remove_symlinks_to, basename(dest));
 317
 318                         if (!found)
 319                                 continue;
 320
 321                         if (unlink(p) < 0 && errno != ENOENT) {
 322                                 if (r == 0)
 323                                         r = -errno;
 324                                 continue;
 325                         }
 326
 327                         path_kill_slashes(p);
 328                         rmdir_parents(p, config_path);
 329                         add_file_change(changes, n_changes, UNIT_FILE_UNLINK, p, NULL);
 330
 331                         if (!set_get(remove_symlinks_to, p)) {
 332
 333                                 q = mark_symlink_for_removal(&remove_symlinks_to, p);
 334                                 if (q < 0) {
 335                                         if (r == 0)
 336                                                 r = q;
 337                                 } else
 338                                         *deleted = true;
 339                         }
 340                 }
 341         }
 342
 343         return r;
 344 }
 345
 346 static int remove_marked_symlinks(
 347                 Set *remove_symlinks_to,
 348                 const char *config_path,
 349                 UnitFileChange **changes,
 350                 unsigned *n_changes,
 351                 char** instance_whitelist) {
 352
 353         _cleanup_close_ int fd = -1;
 354         int r = 0;
 355         bool deleted;
 356
 357         assert(config_path);
 358
 359         if (set_size(remove_symlinks_to) <= 0)
 360                 return 0;
 361
 362         fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
 363         if (fd < 0)
 364                 return -errno;
 365
 366         do {
 367                 int q, cfd;
 368                 deleted = false;
 369
 370                 cfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
 371                 if (cfd < 0) {
 372                         r = -errno;
 373                         break;
 374                 }
 375
 376                 /* This takes possession of cfd and closes it */
 377                 q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &deleted, changes, n_changes, instance_whitelist);
 378                 if (r == 0)
 379                         r = q;
 380         } while (deleted);
 381
 382         return r;
 383 }
 384
 385 static int find_symlinks_fd(
 386                 const char *name,
 387                 int fd,
 388                 const char *path,
 389                 const char *config_path,
 390                 bool *same_name_link) {
 391
 392         int r = 0;
 393         _cleanup_closedir_ DIR *d = NULL;
 394
 395         assert(name);
 396         assert(fd >= 0);
 397         assert(path);
 398         assert(config_path);
 399         assert(same_name_link);
 400
 401         d = fdopendir(fd);
 402         if (!d) {
 403                 safe_close(fd);
 404                 return -errno;
 405         }
 406
 407         for (;;) {
 408                 struct dirent *de;
 409
 410                 errno = 0;
 411                 de = readdir(d);
 412                 if (!de && errno != 0)
 413                         return -errno;
 414
 415                 if (!de)
 416                         return r;
 417
 418                 if (ignore_file(de->d_name))
 419                         continue;
 420
 421                 dirent_ensure_type(d, de);
 422
 423                 if (de->d_type == DT_DIR) {
 424                         int nfd, q;
 425                         _cleanup_free_ char *p = NULL;
 426
 427                         nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
 428                         if (nfd < 0) {
 429                                 if (errno == ENOENT)
 430                                         continue;
 431
 432                                 if (r == 0)
 433                                         r = -errno;
 434                                 continue;
 435                         }
 436
 437                         p = path_make_absolute(de->d_name, path);
 438                         if (!p) {
 439                                 safe_close(nfd);
 440                                 return -ENOMEM;
 441                         }
 442
 443                         /* This will close nfd, regardless whether it succeeds or not */
 444                         q = find_symlinks_fd(name, nfd, p, config_path, same_name_link);
 445                         if (q > 0)
 446                                 return 1;
 447                         if (r == 0)
 448                                 r = q;
 449
 450                 } else if (de->d_type == DT_LNK) {
 451                         _cleanup_free_ char *p = NULL, *dest = NULL;
 452                         bool found_path, found_dest, b = false;
 453                         int q;
 454
 455                         /* Acquire symlink name */
 456                         p = path_make_absolute(de->d_name, path);
 457                         if (!p)
 458                                 return -ENOMEM;
 459
 460                         /* Acquire symlink destination */
 461                         q = readlink_and_canonicalize(p, &dest);
 462                         if (q < 0) {
 463                                 if (q == -ENOENT)
 464                                         continue;
 465
 466                                 if (r == 0)
 467                                         r = q;
 468                                 continue;
 469                         }
 470
 471                         /* Check if the symlink itself matches what we
 472                          * are looking for */
 473                         if (path_is_absolute(name))
 474                                 found_path = path_equal(p, name);
 475                         else
 476                                 found_path = streq(de->d_name, name);
 477
 478                         /* Check if what the symlink points to
 479                          * matches what we are looking for */
 480                         if (path_is_absolute(name))
 481                                 found_dest = path_equal(dest, name);
 482                         else
 483                                 found_dest = streq(basename(dest), name);
 484
 485                         if (found_path && found_dest) {
 486                                 _cleanup_free_ char *t = NULL;
 487
 488                                 /* Filter out same name links in the main
 489                                  * config path */
 490                                 t = path_make_absolute(name, config_path);
 491                                 if (!t)
 492                                         return -ENOMEM;
 493
 494                                 b = path_equal(t, p);
 495                         }
 496
 497                         if (b)
 498                                 *same_name_link = true;
 499                         else if (found_path || found_dest)
 500                                 return 1;
 501                 }
 502         }
 503 }
 504
 505 static int find_symlinks(
 506                 const char *name,
 507                 const char *config_path,
 508                 bool *same_name_link) {
 509
 510         int fd;
 511
 512         assert(name);
 513         assert(config_path);
 514         assert(same_name_link);
 515
 516         fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
 517         if (fd < 0) {
 518                 if (errno == ENOENT)
 519                         return 0;
 520                 return -errno;
 521         }
 522
 523         /* This takes possession of fd and closes it */
 524         return find_symlinks_fd(name, fd, config_path, config_path, same_name_link);
 525 }
 526
 527 static int find_symlinks_in_scope(
 528                 UnitFileScope scope,
 529                 const char *root_dir,
 530                 const char *name,
 531                 UnitFileState *state) {
 532
 533         int r;
 534         _cleanup_free_ char *path = NULL;
 535         bool same_name_link_runtime = false, same_name_link = false;
 536
 537         assert(scope >= 0);
 538         assert(scope < _UNIT_FILE_SCOPE_MAX);
 539         assert(name);
 540
 541
 542         /* First look in runtime config path */
 543         r = get_config_path(scope, true, root_dir, &path);
 544         if (r < 0)
 545                 return r;
 546
 547         r = find_symlinks(name, path, &same_name_link_runtime);
 548         if (r < 0)
 549                 return r;
 550         else if (r > 0) {
 551                 *state = UNIT_FILE_ENABLED_RUNTIME;
 552                 return r;
 553         }
 554
 555         /* Then look in the normal config path */
 556         r = get_config_path(scope, false, root_dir, &path);
 557         if (r < 0)
 558                 return r;
 559
 560         r = find_symlinks(name, path, &same_name_link);
 561         if (r < 0)
 562                 return r;
 563         else if (r > 0) {
 564                 *state = UNIT_FILE_ENABLED;
 565                 return r;
 566         }
 567
 568         /* Hmm, we didn't find it, but maybe we found the same name
 569          * link? */
 570         if (same_name_link_runtime) {
 571                 *state = UNIT_FILE_LINKED_RUNTIME;
 572                 return 1;
 573         } else if (same_name_link) {
 574                 *state = UNIT_FILE_LINKED;
 575                 return 1;
 576         }
 577
 578         return 0;
 579 }
 580
 581 int unit_file_mask(
 582                 UnitFileScope scope,
 583                 bool runtime,
 584                 const char *root_dir,
 585                 char **files,
 586                 bool force,
 587                 UnitFileChange **changes,
 588                 unsigned *n_changes) {
 589
 590         char **i;
 591         _cleanup_free_ char *prefix = NULL;
 592         int r;
 593
 594         assert(scope >= 0);
 595         assert(scope < _UNIT_FILE_SCOPE_MAX);
 596
 597         r = get_config_path(scope, runtime, root_dir, &prefix);
 598         if (r < 0)
 599                 return r;
 600
 601         STRV_FOREACH(i, files) {
 602                 _cleanup_free_ char *path = NULL;
 603
 604                 if (!unit_name_is_valid(*i, TEMPLATE_VALID)) {
 605                         if (r == 0)
 606                                 r = -EINVAL;
 607                         continue;
 608                 }
 609
 610                 path = path_make_absolute(*i, prefix);
 611                 if (!path) {
 612                         r = -ENOMEM;
 613                         break;
 614                 }
 615
 616                 if (symlink("/dev/null", path) >= 0) {
 617                         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, "/dev/null");
 618                         continue;
 619                 }
 620
 621                 if (errno == EEXIST) {
 622
 623                         if (null_or_empty_path(path) > 0)
 624                                 continue;
 625
 626                         if (force) {
 627                                 if (symlink_atomic("/dev/null", path) >= 0) {
 628                                         add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
 629                                         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, "/dev/null");
 630                                         continue;
 631                                 }
 632                         }
 633
 634                         if (r == 0)
 635                                 r = -EEXIST;
 636                 } else {
 637                         if (r == 0)
 638                                 r = -errno;
 639                 }
 640         }
 641
 642         return r;
 643 }
 644
 645 int unit_file_unmask(
 646                 UnitFileScope scope,
 647                 bool runtime,
 648                 const char *root_dir,
 649                 char **files,
 650                 UnitFileChange **changes,
 651                 unsigned *n_changes) {
 652
 653         char **i, *config_path = NULL;
 654         int r, q;
 655         Set *remove_symlinks_to = NULL;
 656
 657         assert(scope >= 0);
 658         assert(scope < _UNIT_FILE_SCOPE_MAX);
 659
 660         r = get_config_path(scope, runtime, root_dir, &config_path);
 661         if (r < 0)
 662                 goto finish;
 663
 664         STRV_FOREACH(i, files) {
 665                 char *path;
 666
 667                 if (!unit_name_is_valid(*i, TEMPLATE_VALID)) {
 668                         if (r == 0)
 669                                 r = -EINVAL;
 670                         continue;
 671                 }
 672
 673                 path = path_make_absolute(*i, config_path);
 674                 if (!path) {
 675                         r = -ENOMEM;
 676                         break;
 677                 }
 678
 679                 q = null_or_empty_path(path);
 680                 if (q > 0) {
 681                         if (unlink(path) >= 0) {
 682                                 mark_symlink_for_removal(&remove_symlinks_to, path);
 683                                 add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
 684
 685                                 free(path);
 686                                 continue;
 687                         }
 688
 689                         q = -errno;
 690                 }
 691
 692                 if (q != -ENOENT && r == 0)
 693                         r = q;
 694
 695                 free(path);
 696         }
 697
 698
 699 finish:
 700         q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
 701         if (r == 0)
 702                 r = q;
 703
 704         set_free_free(remove_symlinks_to);
 705         free(config_path);
 706
 707         return r;
 708 }
 709
 710 int unit_file_link(
 711                 UnitFileScope scope,
 712                 bool runtime,
 713                 const char *root_dir,
 714                 char **files,
 715                 bool force,
 716                 UnitFileChange **changes,
 717                 unsigned *n_changes) {
 718
 719         _cleanup_lookup_paths_free_ LookupPaths paths = {};
 720         char **i;
 721         _cleanup_free_ char *config_path = NULL;
 722         int r, q;
 723
 724         assert(scope >= 0);
 725         assert(scope < _UNIT_FILE_SCOPE_MAX);
 726
 727         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
 728         if (r < 0)
 729                 return r;
 730
 731         r = get_config_path(scope, runtime, root_dir, &config_path);
 732         if (r < 0)
 733                 return r;
 734
 735         STRV_FOREACH(i, files) {
 736                 _cleanup_free_ char *path = NULL;
 737                 char *fn;
 738                 struct stat st;
 739
 740                 fn = basename(*i);
 741
 742                 if (!path_is_absolute(*i) ||
 743                     !unit_name_is_valid(fn, TEMPLATE_VALID)) {
 744                         if (r == 0)
 745                                 r = -EINVAL;
 746                         continue;
 747                 }
 748
 749                 if (lstat(*i, &st) < 0) {
 750                         if (r == 0)
 751                                 r = -errno;
 752                         continue;
 753                 }
 754
 755                 if (!S_ISREG(st.st_mode)) {
 756                         r = -ENOENT;
 757                         continue;
 758                 }
 759
 760                 q = in_search_path(*i, paths.unit_path);
 761                 if (q < 0)
 762                         return q;
 763
 764                 if (q > 0)
 765                         continue;
 766
 767                 path = path_make_absolute(fn, config_path);
 768                 if (!path)
 769                         return -ENOMEM;
 770
 771                 if (symlink(*i, path) >= 0) {
 772                         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, *i);
 773                         continue;
 774                 }
 775
 776                 if (errno == EEXIST) {
 777                         _cleanup_free_ char *dest = NULL;
 778
 779                         q = readlink_and_make_absolute(path, &dest);
 780                         if (q < 0 && errno != ENOENT) {
 781                                 if (r == 0)
 782                                         r = q;
 783                                 continue;
 784                         }
 785
 786                         if (q >= 0 && path_equal(dest, *i))
 787                                 continue;
 788
 789                         if (force) {
 790                                 if (symlink_atomic(*i, path) >= 0) {
 791                                         add_file_change(changes, n_changes, UNIT_FILE_UNLINK, path, NULL);
 792                                         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, path, *i);
 793                                         continue;
 794                                 }
 795                         }
 796
 797                         if (r == 0)
 798                                 r = -EEXIST;
 799                 } else {
 800                         if (r == 0)
 801                                 r = -errno;
 802                 }
 803         }
 804
 805         return r;
 806 }
 807
 808 void unit_file_list_free(Hashmap *h) {
 809         UnitFileList *i;
 810
 811         while ((i = hashmap_steal_first(h))) {
 812                 free(i->path);
 813                 free(i);
 814         }
 815
 816         hashmap_free(h);
 817 }
 818
 819 void unit_file_changes_free(UnitFileChange *changes, unsigned n_changes) {
 820         unsigned i;
 821
 822         assert(changes || n_changes == 0);
 823
 824         if (!changes)
 825                 return;
 826
 827         for (i = 0; i < n_changes; i++) {
 828                 free(changes[i].path);
 829                 free(changes[i].source);
 830         }
 831
 832         free(changes);
 833 }
 834
 835 static void install_info_free(InstallInfo *i) {
 836         assert(i);
 837
 838         free(i->name);
 839         free(i->path);
 840         strv_free(i->aliases);
 841         strv_free(i->wanted_by);
 842         strv_free(i->required_by);
 843         strv_free(i->also);
 844         free(i->default_instance);
 845         free(i);
 846 }
 847
 848 static void install_info_hashmap_free(OrderedHashmap *m) {
 849         InstallInfo *i;
 850
 851         if (!m)
 852                 return;
 853
 854         while ((i = ordered_hashmap_steal_first(m)))
 855                 install_info_free(i);
 856
 857         ordered_hashmap_free(m);
 858 }
 859
 860 static void install_context_done(InstallContext *c) {
 861         assert(c);
 862
 863         install_info_hashmap_free(c->will_install);
 864         install_info_hashmap_free(c->have_installed);
 865
 866         c->will_install = c->have_installed = NULL;
 867 }
 868
 869 static int install_info_add(
 870                 InstallContext *c,
 871                 const char *name,
 872                 const char *path) {
 873         InstallInfo *i = NULL;
 874         int r;
 875
 876         assert(c);
 877         assert(name || path);
 878
 879         if (!name)
 880                 name = basename(path);
 881
 882         if (!unit_name_is_valid(name, TEMPLATE_VALID))
 883                 return -EINVAL;
 884
 885         if (ordered_hashmap_get(c->have_installed, name) ||
 886             ordered_hashmap_get(c->will_install, name))
 887                 return 0;
 888
 889         r = ordered_hashmap_ensure_allocated(&c->will_install, &string_hash_ops);
 890         if (r < 0)
 891                 return r;
 892
 893         i = new0(InstallInfo, 1);
 894         if (!i)
 895                 return -ENOMEM;
 896
 897         i->name = strdup(name);
 898         if (!i->name) {
 899                 r = -ENOMEM;
 900                 goto fail;
 901         }
 902
 903         if (path) {
 904                 i->path = strdup(path);
 905                 if (!i->path) {
 906                         r = -ENOMEM;
 907                         goto fail;
 908                 }
 909         }
 910
 911         r = ordered_hashmap_put(c->will_install, i->name, i);
 912         if (r < 0)
 913                 goto fail;
 914
 915         return 0;
 916
 917 fail:
 918         if (i)
 919                 install_info_free(i);
 920
 921         return r;
 922 }
 923
 924 static int install_info_add_auto(
 925                 InstallContext *c,
 926                 const char *name_or_path) {
 927
 928         assert(c);
 929         assert(name_or_path);
 930
 931         if (path_is_absolute(name_or_path))
 932                 return install_info_add(c, NULL, name_or_path);
 933         else
 934                 return install_info_add(c, name_or_path, NULL);
 935 }
 936
 937 static int config_parse_also(
 938                 const char *unit,
 939                 const char *filename,
 940                 unsigned line,
 941                 const char *section,
 942                 unsigned section_line,
 943                 const char *lvalue,
 944                 int ltype,
 945                 const char *rvalue,
 946                 void *data,
 947                 void *userdata) {
 948
 949         size_t l;
 950         const char *word, *state;
 951         InstallContext *c = data;
 952         InstallInfo *i = userdata;
 953
 954         assert(filename);
 955         assert(lvalue);
 956         assert(rvalue);
 957
 958         FOREACH_WORD_QUOTED(word, l, rvalue, state) {
 959                 _cleanup_free_ char *n;
 960                 int r;
 961
 962                 n = strndup(word, l);
 963                 if (!n)
 964                         return -ENOMEM;
 965
 966                 r = install_info_add(c, n, NULL);
 967                 if (r < 0)
 968                         return r;
 969
 970                 r = strv_extend(&i->also, n);
 971                 if (r < 0)
 972                         return r;
 973         }
 974         if (!isempty(state))
 975                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 976                            "Trailing garbage, ignoring.");
 977
 978         return 0;
 979 }
 980
 981 static int config_parse_user(
 982                 const char *unit,
 983                 const char *filename,
 984                 unsigned line,
 985                 const char *section,
 986                 unsigned section_line,
 987                 const char *lvalue,
 988                 int ltype,
 989                 const char *rvalue,
 990                 void *data,
 991                 void *userdata) {
 992
 993         InstallInfo *i = data;
 994         char *printed;
 995         int r;
 996
 997         assert(filename);
 998         assert(lvalue);
 999         assert(rvalue);
1000
1001         r = install_full_printf(i, rvalue, &printed);
1002         if (r < 0)
1003                 return r;
1004
1005         free(i->user);
1006         i->user = printed;
1007
1008         return 0;
1009 }
1010
1011 static int config_parse_default_instance(
1012                 const char *unit,
1013                 const char *filename,
1014                 unsigned line,
1015                 const char *section,
1016                 unsigned section_line,
1017                 const char *lvalue,
1018                 int ltype,
1019                 const char *rvalue,
1020                 void *data,
1021                 void *userdata) {
1022
1023         InstallInfo *i = data;
1024         char *printed;
1025         int r;
1026
1027         assert(filename);
1028         assert(lvalue);
1029         assert(rvalue);
1030
1031         r = install_full_printf(i, rvalue, &printed);
1032         if (r < 0)
1033                 return r;
1034
1035         if (!unit_instance_is_valid(printed)) {
1036                 free(printed);
1037                 return -EINVAL;
1038         }
1039
1040         free(i->default_instance);
1041         i->default_instance = printed;
1042
1043         return 0;
1044 }
1045
1046 static int unit_file_load(
1047                 InstallContext *c,
1048                 InstallInfo *info,
1049                 const char *path,
1050                 const char *root_dir,
1051                 bool allow_symlink,
1052                 bool load,
1053                 bool *also) {
1054
1055         const ConfigTableItem items[] = {
1056                 { "Install", "Alias",           config_parse_strv,             0, &info->aliases           },
1057                 { "Install", "WantedBy",        config_parse_strv,             0, &info->wanted_by         },
1058                 { "Install", "RequiredBy",      config_parse_strv,             0, &info->required_by       },
1059                 { "Install", "DefaultInstance", config_parse_default_instance, 0, info                     },
1060                 { "Install", "Also",            config_parse_also,             0, c                        },
1061                 { "Exec",    "User",            config_parse_user,             0, info                     },
1062                 {}
1063         };
1064
1065         _cleanup_fclose_ FILE *f = NULL;
1066         int fd, r;
1067
1068         assert(c);
1069         assert(info);
1070         assert(path);
1071
1072         if (!isempty(root_dir))
1073                 path = strappenda(root_dir, "/", path);
1074
1075         if (!load) {
1076                 r = access(path, F_OK) ? -errno : 0;
1077                 return r;
1078         }
1079
1080         fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|(allow_symlink ? 0 : O_NOFOLLOW));
1081         if (fd < 0)
1082                 return -errno;
1083
1084         f = fdopen(fd, "re");
1085         if (!f) {
1086                 safe_close(fd);
1087                 return -ENOMEM;
1088         }
1089
1090         r = config_parse(NULL, path, f,
1091                          NULL,
1092                          config_item_table_lookup, items,
1093                          true, true, false, info);
1094         if (r < 0)
1095                 return r;
1096
1097         if (also)
1098                 *also = !strv_isempty(info->also);
1099
1100         return
1101                 (int) strv_length(info->aliases) +
1102                 (int) strv_length(info->wanted_by) +
1103                 (int) strv_length(info->required_by);
1104 }
1105
1106 static int unit_file_search(
1107                 InstallContext *c,
1108                 InstallInfo *info,
1109                 LookupPaths *paths,
1110                 const char *root_dir,
1111                 bool allow_symlink,
1112                 bool load,
1113                 bool *also) {
1114
1115         char **p;
1116         int r;
1117
1118         assert(c);
1119         assert(info);
1120         assert(paths);
1121
1122         if (info->path)
1123                 return unit_file_load(c, info, info->path, root_dir, allow_symlink, load, also);
1124
1125         assert(info->name);
1126
1127         STRV_FOREACH(p, paths->unit_path) {
1128                 _cleanup_free_ char *path = NULL;
1129
1130                 path = strjoin(*p, "/", info->name, NULL);
1131                 if (!path)
1132                         return -ENOMEM;
1133
1134                 r = unit_file_load(c, info, path, root_dir, allow_symlink, load, also);
1135                 if (r >= 0) {
1136                         info->path = path;
1137                         path = NULL;
1138                         return r;
1139                 }
1140                 if (r != -ENOENT && r != -ELOOP)
1141                         return r;
1142         }
1143
1144         if (unit_name_is_instance(info->name)) {
1145
1146                 /* Unit file doesn't exist, however instance
1147                  * enablement was requested.  We will check if it is
1148                  * possible to load template unit file. */
1149
1150                 _cleanup_free_ char *template = NULL;
1151
1152                 template = unit_name_template(info->name);
1153                 if (!template)
1154                         return -ENOMEM;
1155
1156                 STRV_FOREACH(p, paths->unit_path) {
1157                         _cleanup_free_ char *path = NULL;
1158
1159                         path = strjoin(*p, "/", template, NULL);
1160                         if (!path)
1161                                 return -ENOMEM;
1162
1163                         r = unit_file_load(c, info, path, root_dir, allow_symlink, load, also);
1164                         if (r >= 0) {
1165                                 info->path = path;
1166                                 path = NULL;
1167                                 return r;
1168                         }
1169                         if (r != -ENOENT && r != -ELOOP)
1170                                 return r;
1171                 }
1172         }
1173
1174         return -ENOENT;
1175 }
1176
1177 static int unit_file_can_install(
1178                 LookupPaths *paths,
1179                 const char *root_dir,
1180                 const char *name,
1181                 bool allow_symlink,
1182                 bool *also) {
1183
1184         _cleanup_(install_context_done) InstallContext c = {};
1185         InstallInfo *i;
1186         int r;
1187
1188         assert(paths);
1189         assert(name);
1190
1191         r = install_info_add_auto(&c, name);
1192         if (r < 0)
1193                 return r;
1194
1195         assert_se(i = ordered_hashmap_first(c.will_install));
1196
1197         r = unit_file_search(&c, i, paths, root_dir, allow_symlink, true, also);
1198
1199         if (r >= 0)
1200                 r =
1201                         (int) strv_length(i->aliases) +
1202                         (int) strv_length(i->wanted_by) +
1203                         (int) strv_length(i->required_by);
1204
1205         return r;
1206 }
1207
1208 static int create_symlink(
1209                 const char *old_path,
1210                 const char *new_path,
1211                 bool force,
1212                 UnitFileChange **changes,
1213                 unsigned *n_changes) {
1214
1215         _cleanup_free_ char *dest = NULL;
1216         int r;
1217
1218         assert(old_path);
1219         assert(new_path);
1220
1221         mkdir_parents_label(new_path, 0755);
1222
1223         if (symlink(old_path, new_path) >= 0) {
1224                 add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
1225                 return 0;
1226         }
1227
1228         if (errno != EEXIST)
1229                 return -errno;
1230
1231         r = readlink_and_make_absolute(new_path, &dest);
1232         if (r < 0)
1233                 return r;
1234
1235         if (path_equal(dest, old_path))
1236                 return 0;
1237
1238         if (!force)
1239                 return -EEXIST;
1240
1241         r = symlink_atomic(old_path, new_path);
1242         if (r < 0)
1243                 return r;
1244
1245         add_file_change(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);
1246         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
1247
1248         return 0;
1249 }
1250
1251 static int install_info_symlink_alias(
1252                 InstallInfo *i,
1253                 const char *config_path,
1254                 bool force,
1255                 UnitFileChange **changes,
1256                 unsigned *n_changes) {
1257
1258         char **s;
1259         int r = 0, q;
1260
1261         assert(i);
1262         assert(config_path);
1263
1264         STRV_FOREACH(s, i->aliases) {
1265                 _cleanup_free_ char *alias_path = NULL, *dst = NULL;
1266
1267                 q = install_full_printf(i, *s, &dst);
1268                 if (q < 0)
1269                         return q;
1270
1271                 alias_path = path_make_absolute(dst, config_path);
1272                 if (!alias_path)
1273                         return -ENOMEM;
1274
1275                 q = create_symlink(i->path, alias_path, force, changes, n_changes);
1276                 if (r == 0)
1277                         r = q;
1278         }
1279
1280         return r;
1281 }
1282
1283 static int install_info_symlink_wants(
1284                 InstallInfo *i,
1285                 const char *config_path,
1286                 char **list,
1287                 const char *suffix,
1288                 bool force,
1289                 UnitFileChange **changes,
1290                 unsigned *n_changes) {
1291
1292         _cleanup_free_ char *buf = NULL;
1293         const char *n;
1294         char **s;
1295         int r = 0, q;
1296
1297         assert(i);
1298         assert(config_path);
1299
1300         if (unit_name_is_template(i->name)) {
1301
1302                 /* Don't install any symlink if there's no default
1303                  * instance configured */
1304
1305                 if (!i->default_instance)
1306                         return 0;
1307
1308                 buf = unit_name_replace_instance(i->name, i->default_instance);
1309                 if (!buf)
1310                         return -ENOMEM;
1311
1312                 n = buf;
1313         } else
1314                 n = i->name;
1315
1316         STRV_FOREACH(s, list) {
1317                 _cleanup_free_ char *path = NULL, *dst = NULL;
1318
1319                 q = install_full_printf(i, *s, &dst);
1320                 if (q < 0)
1321                         return q;
1322
1323                 if (!unit_name_is_valid(dst, TEMPLATE_VALID)) {
1324                         r = -EINVAL;
1325                         continue;
1326                 }
1327
1328                 path = strjoin(config_path, "/", dst, suffix, n, NULL);
1329                 if (!path)
1330                         return -ENOMEM;
1331
1332                 q = create_symlink(i->path, path, force, changes, n_changes);
1333                 if (r == 0)
1334                         r = q;
1335         }
1336
1337         return r;
1338 }
1339
1340 static int install_info_symlink_link(
1341                 InstallInfo *i,
1342                 LookupPaths *paths,
1343                 const char *config_path,
1344                 const char *root_dir,
1345                 bool force,
1346                 UnitFileChange **changes,
1347                 unsigned *n_changes) {
1348
1349         _cleanup_free_ char *path = NULL;
1350         int r;
1351
1352         assert(i);
1353         assert(paths);
1354         assert(config_path);
1355         assert(i->path);
1356
1357         r = in_search_path(i->path, paths->unit_path);
1358         if (r != 0)
1359                 return r;
1360
1361         path = strjoin(config_path, "/", i->name, NULL);
1362         if (!path)
1363                 return -ENOMEM;
1364
1365         return create_symlink(i->path, path, force, changes, n_changes);
1366 }
1367
1368 static int install_info_apply(
1369                 InstallInfo *i,
1370                 LookupPaths *paths,
1371                 const char *config_path,
1372                 const char *root_dir,
1373                 bool force,
1374                 UnitFileChange **changes,
1375                 unsigned *n_changes) {
1376
1377         int r, q;
1378
1379         assert(i);
1380         assert(paths);
1381         assert(config_path);
1382
1383         r = install_info_symlink_alias(i, config_path, force, changes, n_changes);
1384
1385         q = install_info_symlink_wants(i, config_path, i->wanted_by, ".wants/", force, changes, n_changes);
1386         if (r == 0)
1387                 r = q;
1388
1389         q = install_info_symlink_wants(i, config_path, i->required_by, ".requires/", force, changes, n_changes);
1390         if (r == 0)
1391                 r = q;
1392
1393         q = install_info_symlink_link(i, paths, config_path, root_dir, force, changes, n_changes);
1394         if (r == 0)
1395                 r = q;
1396
1397         return r;
1398 }
1399
1400 static int install_context_apply(
1401                 InstallContext *c,
1402                 LookupPaths *paths,
1403                 const char *config_path,
1404                 const char *root_dir,
1405                 bool force,
1406                 UnitFileChange **changes,
1407                 unsigned *n_changes) {
1408
1409         InstallInfo *i;
1410         int r, q;
1411
1412         assert(c);
1413         assert(paths);
1414         assert(config_path);
1415
1416         if (!ordered_hashmap_isempty(c->will_install)) {
1417                 r = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1418                 if (r < 0)
1419                         return r;
1420
1421                 r = ordered_hashmap_reserve(c->have_installed, ordered_hashmap_size(c->will_install));
1422                 if (r < 0)
1423                         return r;
1424         }
1425
1426         r = 0;
1427         while ((i = ordered_hashmap_first(c->will_install))) {
1428                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1429
1430                 q = unit_file_search(c, i, paths, root_dir, false, true, NULL);
1431                 if (q < 0) {
1432                         if (r >= 0)
1433                                 r = q;
1434
1435                         return r;
1436                 } else if (r >= 0)
1437                         r += q;
1438
1439                 q = install_info_apply(i, paths, config_path, root_dir, force, changes, n_changes);
1440                 if (r >= 0 && q < 0)
1441                         r = q;
1442         }
1443
1444         return r;
1445 }
1446
1447 static int install_context_mark_for_removal(
1448                 InstallContext *c,
1449                 LookupPaths *paths,
1450                 Set **remove_symlinks_to,
1451                 const char *config_path,
1452                 const char *root_dir) {
1453
1454         InstallInfo *i;
1455         int r, q;
1456
1457         assert(c);
1458         assert(paths);
1459         assert(config_path);
1460
1461         /* Marks all items for removal */
1462
1463         if (!ordered_hashmap_isempty(c->will_install)) {
1464                 r = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1465                 if (r < 0)
1466                         return r;
1467
1468                 r = ordered_hashmap_reserve(c->have_installed, ordered_hashmap_size(c->will_install));
1469                 if (r < 0)
1470                         return r;
1471         }
1472
1473         r = 0;
1474         while ((i = ordered_hashmap_first(c->will_install))) {
1475                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1476
1477                 q = unit_file_search(c, i, paths, root_dir, false, true, NULL);
1478                 if (q == -ENOENT) {
1479                         /* do nothing */
1480                 } else if (q < 0) {
1481                         if (r >= 0)
1482                                 r = q;
1483
1484                         return r;
1485                 } else if (r >= 0)
1486                         r += q;
1487
1488                 if (unit_name_is_instance(i->name)) {
1489                         char *unit_file;
1490
1491                         if (i->path) {
1492                                 unit_file = basename(i->path);
1493
1494                                 if (unit_name_is_instance(unit_file))
1495                                         /* unit file named as instance exists, thus all symlinks
1496                                          * pointing to it will be removed */
1497                                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1498                                 else
1499                                         /* does not exist, thus we will mark for removal symlinks
1500                                          * to template unit file */
1501                                         q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1502                         } else {
1503                                 /* If i->path is not set, it means that we didn't actually find
1504                                  * the unit file. But we can still remove symlinks to the
1505                                  * nonexistent template. */
1506                                 unit_file = unit_name_template(i->name);
1507                                 if (!unit_file)
1508                                         return log_oom();
1509
1510                                 q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1511                                 free(unit_file);
1512                         }
1513                 } else
1514                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1515
1516                 if (r >= 0 && q < 0)
1517                         r = q;
1518         }
1519
1520         return r;
1521 }
1522
1523 int unit_file_add_dependency(
1524                 UnitFileScope scope,
1525                 bool runtime,
1526                 const char *root_dir,
1527                 char **files,
1528                 char *target,
1529                 UnitDependency dep,
1530                 bool force,
1531                 UnitFileChange **changes,
1532                 unsigned *n_changes) {
1533
1534         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1535         _cleanup_(install_context_done) InstallContext c = {};
1536         _cleanup_free_ char *config_path = NULL;
1537         char **i;
1538         int r;
1539         InstallInfo *info;
1540
1541         assert(scope >= 0);
1542         assert(scope < _UNIT_FILE_SCOPE_MAX);
1543
1544         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1545         if (r < 0)
1546                 return r;
1547
1548         r = get_config_path(scope, runtime, root_dir, &config_path);
1549         if (r < 0)
1550                 return r;
1551
1552         STRV_FOREACH(i, files) {
1553                 UnitFileState state;
1554
1555                 state = unit_file_get_state(scope, root_dir, *i);
1556                 if (state < 0) {
1557                         log_error("Failed to get unit file state for %s: %s", *i, strerror(-state));
1558                         return state;
1559                 }
1560
1561                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1562                         log_error("Failed to enable unit: Unit %s is masked", *i);
1563                         return -ENOTSUP;
1564                 }
1565
1566                 r = install_info_add_auto(&c, *i);
1567                 if (r < 0)
1568                         return r;
1569         }
1570
1571         if (!ordered_hashmap_isempty(c.will_install)) {
1572                 r = ordered_hashmap_ensure_allocated(&c.have_installed, &string_hash_ops);
1573                 if (r < 0)
1574                         return r;
1575
1576                 r = ordered_hashmap_reserve(c.have_installed, ordered_hashmap_size(c.will_install));
1577                 if (r < 0)
1578                         return r;
1579         }
1580
1581         while ((info = ordered_hashmap_first(c.will_install))) {
1582                 assert_se(ordered_hashmap_move_one(c.have_installed, c.will_install, info->name) == 0);
1583
1584                 r = unit_file_search(&c, info, &paths, root_dir, false, false, NULL);
1585                 if (r < 0)
1586                         return r;
1587
1588                 if (dep == UNIT_WANTS)
1589                         r = strv_extend(&info->wanted_by, target);
1590                 else if (dep == UNIT_REQUIRES)
1591                         r = strv_extend(&info->required_by, target);
1592                 else
1593                         r = -EINVAL;
1594
1595                 if (r < 0)
1596                         return r;
1597
1598                 r = install_info_apply(info, &paths, config_path, root_dir, force, changes, n_changes);
1599                 if (r < 0)
1600                         return r;
1601         }
1602
1603         return 0;
1604 }
1605
1606 int unit_file_enable(
1607                 UnitFileScope scope,
1608                 bool runtime,
1609                 const char *root_dir,
1610                 char **files,
1611                 bool force,
1612                 UnitFileChange **changes,
1613                 unsigned *n_changes) {
1614
1615         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1616         _cleanup_(install_context_done) InstallContext c = {};
1617         char **i;
1618         _cleanup_free_ char *config_path = NULL;
1619         int r;
1620
1621         assert(scope >= 0);
1622         assert(scope < _UNIT_FILE_SCOPE_MAX);
1623
1624         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1625         if (r < 0)
1626                 return r;
1627
1628         r = get_config_path(scope, runtime, root_dir, &config_path);
1629         if (r < 0)
1630                 return r;
1631
1632         STRV_FOREACH(i, files) {
1633                 UnitFileState state;
1634
1635                 /* We only want to know if this unit is masked, so we ignore
1636                  * errors from unit_file_get_state, deferring other checks.
1637                  * This allows templated units to be enabled on the fly. */
1638                 state = unit_file_get_state(scope, root_dir, *i);
1639                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1640                         log_error("Failed to enable unit: Unit %s is masked", *i);
1641                         return -ENOTSUP;
1642                 }
1643
1644                 r = install_info_add_auto(&c, *i);
1645                 if (r < 0)
1646                         return r;
1647         }
1648
1649         /* This will return the number of symlink rules that were
1650         supposed to be created, not the ones actually created. This is
1651         useful to determine whether the passed files had any
1652         installation data at all. */
1653
1654         return install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
1655 }
1656
1657 int unit_file_disable(
1658                 UnitFileScope scope,
1659                 bool runtime,
1660                 const char *root_dir,
1661                 char **files,
1662                 UnitFileChange **changes,
1663                 unsigned *n_changes) {
1664
1665         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1666         _cleanup_(install_context_done) InstallContext c = {};
1667         char **i;
1668         _cleanup_free_ char *config_path = NULL;
1669         _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
1670         int r, q;
1671
1672         assert(scope >= 0);
1673         assert(scope < _UNIT_FILE_SCOPE_MAX);
1674
1675         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1676         if (r < 0)
1677                 return r;
1678
1679         r = get_config_path(scope, runtime, root_dir, &config_path);
1680         if (r < 0)
1681                 return r;
1682
1683         STRV_FOREACH(i, files) {
1684                 r = install_info_add_auto(&c, *i);
1685                 if (r < 0)
1686                         return r;
1687         }
1688
1689         r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
1690
1691         q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
1692         if (r >= 0)
1693                 r = q;
1694
1695         return r;
1696 }
1697
1698 int unit_file_reenable(
1699                 UnitFileScope scope,
1700                 bool runtime,
1701                 const char *root_dir,
1702                 char **files,
1703                 bool force,
1704                 UnitFileChange **changes,
1705                 unsigned *n_changes) {
1706         int r;
1707
1708         r = unit_file_disable(scope, runtime, root_dir, files,
1709                               changes, n_changes);
1710         if (r < 0)
1711                 return r;
1712
1713         return unit_file_enable(scope, runtime, root_dir, files, force,
1714                                 changes, n_changes);
1715 }
1716
1717 int unit_file_set_default(
1718                 UnitFileScope scope,
1719                 const char *root_dir,
1720                 const char *file,
1721                 bool force,
1722                 UnitFileChange **changes,
1723                 unsigned *n_changes) {
1724
1725         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1726         _cleanup_(install_context_done) InstallContext c = {};
1727         _cleanup_free_ char *config_path = NULL;
1728         char *path;
1729         int r;
1730         InstallInfo *i = NULL;
1731
1732         assert(scope >= 0);
1733         assert(scope < _UNIT_FILE_SCOPE_MAX);
1734         assert(file);
1735
1736         if (unit_name_to_type(file) != UNIT_TARGET)
1737                 return -EINVAL;
1738
1739         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1740         if (r < 0)
1741                 return r;
1742
1743         r = get_config_path(scope, false, root_dir, &config_path);
1744         if (r < 0)
1745                 return r;
1746
1747         r = install_info_add_auto(&c, file);
1748         if (r < 0)
1749                 return r;
1750
1751         assert_se(i = ordered_hashmap_first(c.will_install));
1752
1753         r = unit_file_search(&c, i, &paths, root_dir, false, true, NULL);
1754         if (r < 0)
1755                 return r;
1756
1757         path = strappenda(config_path, "/" SPECIAL_DEFAULT_TARGET);
1758
1759         r = create_symlink(i->path, path, force, changes, n_changes);
1760         if (r < 0)
1761                 return r;
1762
1763         return 0;
1764 }
1765
1766 int unit_file_get_default(
1767                 UnitFileScope scope,
1768                 const char *root_dir,
1769                 char **name) {
1770
1771         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1772         char **p;
1773         int r;
1774
1775         assert(scope >= 0);
1776         assert(scope < _UNIT_FILE_SCOPE_MAX);
1777         assert(name);
1778
1779         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1780         if (r < 0)
1781                 return r;
1782
1783         STRV_FOREACH(p, paths.unit_path) {
1784                 _cleanup_free_ char *path = NULL, *tmp = NULL;
1785                 char *n;
1786
1787                 path = path_join(root_dir, *p, SPECIAL_DEFAULT_TARGET);
1788                 if (!path)
1789                         return -ENOMEM;
1790
1791                 r = readlink_malloc(path, &tmp);
1792                 if (r == -ENOENT)
1793                         continue;
1794                 else if (r == -EINVAL)
1795                         /* not a symlink */
1796                         n = strdup(SPECIAL_DEFAULT_TARGET);
1797                 else if (r < 0)
1798                         return r;
1799                 else
1800                         n = strdup(basename(tmp));
1801
1802                 if (!n)
1803                         return -ENOMEM;
1804
1805                 *name = n;
1806                 return 0;
1807         }
1808
1809         return -ENOENT;
1810 }
1811
1812 UnitFileState unit_file_get_state(
1813                 UnitFileScope scope,
1814                 const char *root_dir,
1815                 const char *name) {
1816
1817         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1818         UnitFileState state = _UNIT_FILE_STATE_INVALID;
1819         char **i;
1820         _cleanup_free_ char *path = NULL;
1821         int r;
1822
1823         assert(scope >= 0);
1824         assert(scope < _UNIT_FILE_SCOPE_MAX);
1825         assert(name);
1826
1827         if (root_dir && scope != UNIT_FILE_SYSTEM)
1828                 return -EINVAL;
1829
1830         if (!unit_name_is_valid(name, TEMPLATE_VALID))
1831                 return -EINVAL;
1832
1833         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1834         if (r < 0)
1835                 return r;
1836
1837         STRV_FOREACH(i, paths.unit_path) {
1838                 struct stat st;
1839                 char *partial;
1840                 bool also = false;
1841
1842                 free(path);
1843                 path = NULL;
1844
1845                 path = path_join(root_dir, *i, name);
1846                 if (!path)
1847                         return -ENOMEM;
1848
1849                 if (root_dir)
1850                         partial = path + strlen(root_dir);
1851                 else
1852                         partial = path;
1853
1854                 /*
1855                  * Search for a unit file in our default paths, to
1856                  * be sure, that there are no broken symlinks.
1857                  */
1858                 if (lstat(path, &st) < 0) {
1859                         r = -errno;
1860                         if (errno != ENOENT)
1861                                 return r;
1862
1863                         if (!unit_name_is_instance(name))
1864                                 continue;
1865                 } else {
1866                         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
1867                                 return -ENOENT;
1868
1869                         r = null_or_empty_path(path);
1870                         if (r < 0 && r != -ENOENT)
1871                                 return r;
1872                         else if (r > 0) {
1873                                 state = path_startswith(*i, "/run") ?
1874                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
1875                                 return state;
1876                         }
1877                 }
1878
1879                 r = find_symlinks_in_scope(scope, root_dir, name, &state);
1880                 if (r < 0)
1881                         return r;
1882                 else if (r > 0)
1883                         return state;
1884
1885                 r = unit_file_can_install(&paths, root_dir, partial, true, &also);
1886                 if (r < 0 && errno != ENOENT)
1887                         return r;
1888                 else if (r > 0)
1889                         return UNIT_FILE_DISABLED;
1890                 else if (r == 0) {
1891                         if (also)
1892                                 return UNIT_FILE_INDIRECT;
1893                         return UNIT_FILE_STATIC;
1894                 }
1895         }
1896
1897         return r < 0 ? r : state;
1898 }
1899
1900 int unit_file_query_preset(UnitFileScope scope, const char *root_dir, const char *name) {
1901         _cleanup_strv_free_ char **files = NULL;
1902         char **p;
1903         int r;
1904
1905         assert(scope >= 0);
1906         assert(scope < _UNIT_FILE_SCOPE_MAX);
1907         assert(name);
1908
1909         if (scope == UNIT_FILE_SYSTEM)
1910                 r = conf_files_list(&files, ".preset", root_dir,
1911                                     "/etc/systemd/system-preset",
1912                                     "/usr/local/lib/systemd/system-preset",
1913                                     "/usr/lib/systemd/system-preset",
1914 #ifdef HAVE_SPLIT_USR
1915                                     "/lib/systemd/system-preset",
1916 #endif
1917                                     NULL);
1918         else if (scope == UNIT_FILE_GLOBAL)
1919                 r = conf_files_list(&files, ".preset", root_dir,
1920                                     "/etc/systemd/user-preset",
1921                                     "/usr/local/lib/systemd/user-preset",
1922                                     "/usr/lib/systemd/user-preset",
1923                                     NULL);
1924         else
1925                 return 1;
1926
1927         if (r < 0)
1928                 return r;
1929
1930         STRV_FOREACH(p, files) {
1931                 _cleanup_fclose_ FILE *f;
1932
1933                 f = fopen(*p, "re");
1934                 if (!f) {
1935                         if (errno == ENOENT)
1936                                 continue;
1937
1938                         return -errno;
1939                 }
1940
1941                 for (;;) {
1942                         char line[LINE_MAX], *l;
1943
1944                         if (!fgets(line, sizeof(line), f))
1945                                 break;
1946
1947                         l = strstrip(line);
1948                         if (!*l)
1949                                 continue;
1950
1951                         if (strchr(COMMENTS "\n", *l))
1952                                 continue;
1953
1954                         if (first_word(l, "enable")) {
1955                                 l += 6;
1956                                 l += strspn(l, WHITESPACE);
1957
1958                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1959                                         log_debug("Preset file says enable %s.", name);
1960                                         return 1;
1961                                 }
1962
1963                         } else if (first_word(l, "disable")) {
1964                                 l += 7;
1965                                 l += strspn(l, WHITESPACE);
1966
1967                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1968                                         log_debug("Preset file says disable %s.", name);
1969                                         return 0;
1970                                 }
1971
1972                         } else
1973                                 log_debug("Couldn't parse line '%s'", l);
1974                 }
1975         }
1976
1977         /* Default is "enable" */
1978         log_debug("Preset file doesn't say anything about %s, enabling.", name);
1979         return 1;
1980 }
1981
1982 int unit_file_preset(
1983                 UnitFileScope scope,
1984                 bool runtime,
1985                 const char *root_dir,
1986                 char **files,
1987                 UnitFilePresetMode mode,
1988                 bool force,
1989                 UnitFileChange **changes,
1990                 unsigned *n_changes) {
1991
1992         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
1993         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1994         _cleanup_free_ char *config_path = NULL;
1995         char **i;
1996         int r, q;
1997
1998         assert(scope >= 0);
1999         assert(scope < _UNIT_FILE_SCOPE_MAX);
2000         assert(mode < _UNIT_FILE_PRESET_MAX);
2001
2002         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2003         if (r < 0)
2004                 return r;
2005
2006         r = get_config_path(scope, runtime, root_dir, &config_path);
2007         if (r < 0)
2008                 return r;
2009
2010         STRV_FOREACH(i, files) {
2011
2012                 if (!unit_name_is_valid(*i, TEMPLATE_VALID))
2013                         return -EINVAL;
2014
2015                 r = unit_file_query_preset(scope, root_dir, *i);
2016                 if (r < 0)
2017                         return r;
2018
2019                 if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2020                         r = install_info_add_auto(&plus, *i);
2021                 else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2022                         r = install_info_add_auto(&minus, *i);
2023                 else
2024                         r = 0;
2025                 if (r < 0)
2026                         return r;
2027         }
2028
2029         r = 0;
2030
2031         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2032                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2033
2034                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2035
2036                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
2037                 if (r == 0)
2038                         r = q;
2039         }
2040
2041         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2042                 /* Returns number of symlinks that where supposed to be installed. */
2043                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2044                 if (r == 0)
2045                         r = q;
2046         }
2047
2048         return r;
2049 }
2050
2051 int unit_file_preset_all(
2052                 UnitFileScope scope,
2053                 bool runtime,
2054                 const char *root_dir,
2055                 UnitFilePresetMode mode,
2056                 bool force,
2057                 UnitFileChange **changes,
2058                 unsigned *n_changes) {
2059
2060         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
2061         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2062         _cleanup_free_ char *config_path = NULL;
2063         char **i;
2064         int r, q;
2065
2066         assert(scope >= 0);
2067         assert(scope < _UNIT_FILE_SCOPE_MAX);
2068         assert(mode < _UNIT_FILE_PRESET_MAX);
2069
2070         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2071         if (r < 0)
2072                 return r;
2073
2074         r = get_config_path(scope, runtime, root_dir, &config_path);
2075         if (r < 0)
2076                 return r;
2077
2078         STRV_FOREACH(i, paths.unit_path) {
2079                 _cleanup_closedir_ DIR *d = NULL;
2080                 _cleanup_free_ char *units_dir;
2081
2082                 units_dir = path_join(root_dir, *i, NULL);
2083                 if (!units_dir)
2084                         return -ENOMEM;
2085
2086                 d = opendir(units_dir);
2087                 if (!d) {
2088                         if (errno == ENOENT)
2089                                 continue;
2090
2091                         return -errno;
2092                 }
2093
2094                 for (;;) {
2095                         struct dirent *de;
2096
2097                         errno = 0;
2098                         de = readdir(d);
2099                         if (!de && errno != 0)
2100                                 return -errno;
2101
2102                         if (!de)
2103                                 break;
2104
2105                         if (ignore_file(de->d_name))
2106                                 continue;
2107
2108                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2109                                 continue;
2110
2111                         dirent_ensure_type(d, de);
2112
2113                         if (de->d_type != DT_REG)
2114                                 continue;
2115
2116                         r = unit_file_query_preset(scope, root_dir, de->d_name);
2117                         if (r < 0)
2118                                 return r;
2119
2120                         if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2121                                 r = install_info_add_auto(&plus, de->d_name);
2122                         else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2123                                 r = install_info_add_auto(&minus, de->d_name);
2124                         else
2125                                 r = 0;
2126                         if (r < 0)
2127                                 return r;
2128                 }
2129         }
2130
2131         r = 0;
2132
2133         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2134                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2135
2136                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2137
2138                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, NULL);
2139                 if (r == 0)
2140                         r = q;
2141         }
2142
2143         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2144                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2145                 if (r == 0)
2146                         r = q;
2147         }
2148
2149         return r;
2150 }
2151
2152 static void unit_file_list_free_one(UnitFileList *f) {
2153         if (!f)
2154                 return;
2155
2156         free(f->path);
2157         free(f);
2158 }
2159
2160 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
2161
2162 int unit_file_get_list(
2163                 UnitFileScope scope,
2164                 const char *root_dir,
2165                 Hashmap *h) {
2166
2167         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2168         char **i;
2169         int r;
2170
2171         assert(scope >= 0);
2172         assert(scope < _UNIT_FILE_SCOPE_MAX);
2173         assert(h);
2174
2175         if (root_dir && scope != UNIT_FILE_SYSTEM)
2176                 return -EINVAL;
2177
2178         if (root_dir) {
2179                 r = access(root_dir, F_OK);
2180                 if (r < 0)
2181                         return -errno;
2182         }
2183
2184         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2185         if (r < 0)
2186                 return r;
2187
2188         STRV_FOREACH(i, paths.unit_path) {
2189                 _cleanup_closedir_ DIR *d = NULL;
2190                 _cleanup_free_ char *units_dir;
2191
2192                 units_dir = path_join(root_dir, *i, NULL);
2193                 if (!units_dir)
2194                         return -ENOMEM;
2195
2196                 d = opendir(units_dir);
2197                 if (!d) {
2198                         if (errno == ENOENT)
2199                                 continue;
2200
2201                         return -errno;
2202                 }
2203
2204                 for (;;) {
2205                         _cleanup_(unit_file_list_free_onep) UnitFileList *f = NULL;
2206                         struct dirent *de;
2207                         _cleanup_free_ char *path = NULL;
2208
2209                         errno = 0;
2210                         de = readdir(d);
2211                         if (!de && errno != 0)
2212                                 return -errno;
2213
2214                         if (!de)
2215                                 break;
2216
2217                         if (ignore_file(de->d_name))
2218                                 continue;
2219
2220                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2221                                 continue;
2222
2223                         if (hashmap_get(h, de->d_name))
2224                                 continue;
2225
2226                         dirent_ensure_type(d, de);
2227
2228                         if (!IN_SET(de->d_type, DT_LNK, DT_REG))
2229                                 continue;
2230
2231                         f = new0(UnitFileList, 1);
2232                         if (!f)
2233                                 return -ENOMEM;
2234
2235                         f->path = path_make_absolute(de->d_name, units_dir);
2236                         if (!f->path)
2237                                 return -ENOMEM;
2238
2239                         r = null_or_empty_path(f->path);
2240                         if (r < 0 && r != -ENOENT)
2241                                 return r;
2242                         else if (r > 0) {
2243                                 f->state =
2244                                         path_startswith(*i, "/run") ?
2245                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
2246                                 goto found;
2247                         }
2248
2249                         r = find_symlinks_in_scope(scope, root_dir, de->d_name, &f->state);
2250                         if (r < 0)
2251                                 return r;
2252                         else if (r > 0) {
2253                                 f->state = UNIT_FILE_ENABLED;
2254                                 goto found;
2255                         }
2256
2257                         path = path_make_absolute(de->d_name, *i);
2258                         if (!path)
2259                                 return -ENOMEM;
2260
2261                         r = unit_file_can_install(&paths, root_dir, path, true, NULL);
2262                         if (r == -EINVAL ||  /* Invalid setting? */
2263                             r == -EBADMSG || /* Invalid format? */
2264                             r == -ENOENT     /* Included file not found? */)
2265                                 f->state = UNIT_FILE_INVALID;
2266                         else if (r < 0)
2267                                 return r;
2268                         else if (r > 0)
2269                                 f->state = UNIT_FILE_DISABLED;
2270                         else
2271                                 f->state = UNIT_FILE_STATIC;
2272
2273                 found:
2274                         r = hashmap_put(h, basename(f->path), f);
2275                         if (r < 0)
2276                                 return r;
2277                         f = NULL; /* prevent cleanup */
2278                 }
2279         }
2280
2281         return r;
2282 }
2283
2284 static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
2285         [UNIT_FILE_ENABLED] = "enabled",
2286         [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtime",
2287         [UNIT_FILE_LINKED] = "linked",
2288         [UNIT_FILE_LINKED_RUNTIME] = "linked-runtime",
2289         [UNIT_FILE_MASKED] = "masked",
2290         [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
2291         [UNIT_FILE_STATIC] = "static",
2292         [UNIT_FILE_DISABLED] = "disabled",
2293         [UNIT_FILE_INDIRECT] = "indirect",
2294         [UNIT_FILE_INVALID] = "invalid",
2295 };
2296
2297 DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
2298
2299 static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
2300         [UNIT_FILE_SYMLINK] = "symlink",
2301         [UNIT_FILE_UNLINK] = "unlink",
2302 };
2303
2304 DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
2305
2306 static const char* const unit_file_preset_mode_table[_UNIT_FILE_PRESET_MAX] = {
2307         [UNIT_FILE_PRESET_FULL] = "full",
2308         [UNIT_FILE_PRESET_ENABLE_ONLY] = "enable-only",
2309         [UNIT_FILE_PRESET_DISABLE_ONLY] = "disable-only",
2310 };
2311
2312 DEFINE_STRING_TABLE_LOOKUP(unit_file_preset_mode, UnitFilePresetMode);