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                         return log_error_errno(state, "Failed to get unit file state for %s: %m", *i);
1558
1559                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1560                         log_error("Failed to enable unit: Unit %s is masked", *i);
1561                         return -ENOTSUP;
1562                 }
1563
1564                 r = install_info_add_auto(&c, *i);
1565                 if (r < 0)
1566                         return r;
1567         }
1568
1569         if (!ordered_hashmap_isempty(c.will_install)) {
1570                 r = ordered_hashmap_ensure_allocated(&c.have_installed, &string_hash_ops);
1571                 if (r < 0)
1572                         return r;
1573
1574                 r = ordered_hashmap_reserve(c.have_installed, ordered_hashmap_size(c.will_install));
1575                 if (r < 0)
1576                         return r;
1577         }
1578
1579         while ((info = ordered_hashmap_first(c.will_install))) {
1580                 assert_se(ordered_hashmap_move_one(c.have_installed, c.will_install, info->name) == 0);
1581
1582                 r = unit_file_search(&c, info, &paths, root_dir, false, false, NULL);
1583                 if (r < 0)
1584                         return r;
1585
1586                 if (dep == UNIT_WANTS)
1587                         r = strv_extend(&info->wanted_by, target);
1588                 else if (dep == UNIT_REQUIRES)
1589                         r = strv_extend(&info->required_by, target);
1590                 else
1591                         r = -EINVAL;
1592
1593                 if (r < 0)
1594                         return r;
1595
1596                 r = install_info_apply(info, &paths, config_path, root_dir, force, changes, n_changes);
1597                 if (r < 0)
1598                         return r;
1599         }
1600
1601         return 0;
1602 }
1603
1604 int unit_file_enable(
1605                 UnitFileScope scope,
1606                 bool runtime,
1607                 const char *root_dir,
1608                 char **files,
1609                 bool force,
1610                 UnitFileChange **changes,
1611                 unsigned *n_changes) {
1612
1613         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1614         _cleanup_(install_context_done) InstallContext c = {};
1615         char **i;
1616         _cleanup_free_ char *config_path = NULL;
1617         int r;
1618
1619         assert(scope >= 0);
1620         assert(scope < _UNIT_FILE_SCOPE_MAX);
1621
1622         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1623         if (r < 0)
1624                 return r;
1625
1626         r = get_config_path(scope, runtime, root_dir, &config_path);
1627         if (r < 0)
1628                 return r;
1629
1630         STRV_FOREACH(i, files) {
1631                 UnitFileState state;
1632
1633                 /* We only want to know if this unit is masked, so we ignore
1634                  * errors from unit_file_get_state, deferring other checks.
1635                  * This allows templated units to be enabled on the fly. */
1636                 state = unit_file_get_state(scope, root_dir, *i);
1637                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1638                         log_error("Failed to enable unit: Unit %s is masked", *i);
1639                         return -ENOTSUP;
1640                 }
1641
1642                 r = install_info_add_auto(&c, *i);
1643                 if (r < 0)
1644                         return r;
1645         }
1646
1647         /* This will return the number of symlink rules that were
1648         supposed to be created, not the ones actually created. This is
1649         useful to determine whether the passed files had any
1650         installation data at all. */
1651
1652         return install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
1653 }
1654
1655 int unit_file_disable(
1656                 UnitFileScope scope,
1657                 bool runtime,
1658                 const char *root_dir,
1659                 char **files,
1660                 UnitFileChange **changes,
1661                 unsigned *n_changes) {
1662
1663         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1664         _cleanup_(install_context_done) InstallContext c = {};
1665         char **i;
1666         _cleanup_free_ char *config_path = NULL;
1667         _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
1668         int r, q;
1669
1670         assert(scope >= 0);
1671         assert(scope < _UNIT_FILE_SCOPE_MAX);
1672
1673         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1674         if (r < 0)
1675                 return r;
1676
1677         r = get_config_path(scope, runtime, root_dir, &config_path);
1678         if (r < 0)
1679                 return r;
1680
1681         STRV_FOREACH(i, files) {
1682                 r = install_info_add_auto(&c, *i);
1683                 if (r < 0)
1684                         return r;
1685         }
1686
1687         r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
1688
1689         q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
1690         if (r >= 0)
1691                 r = q;
1692
1693         return r;
1694 }
1695
1696 int unit_file_reenable(
1697                 UnitFileScope scope,
1698                 bool runtime,
1699                 const char *root_dir,
1700                 char **files,
1701                 bool force,
1702                 UnitFileChange **changes,
1703                 unsigned *n_changes) {
1704         int r;
1705
1706         r = unit_file_disable(scope, runtime, root_dir, files,
1707                               changes, n_changes);
1708         if (r < 0)
1709                 return r;
1710
1711         return unit_file_enable(scope, runtime, root_dir, files, force,
1712                                 changes, n_changes);
1713 }
1714
1715 int unit_file_set_default(
1716                 UnitFileScope scope,
1717                 const char *root_dir,
1718                 const char *file,
1719                 bool force,
1720                 UnitFileChange **changes,
1721                 unsigned *n_changes) {
1722
1723         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1724         _cleanup_(install_context_done) InstallContext c = {};
1725         _cleanup_free_ char *config_path = NULL;
1726         char *path;
1727         int r;
1728         InstallInfo *i = NULL;
1729
1730         assert(scope >= 0);
1731         assert(scope < _UNIT_FILE_SCOPE_MAX);
1732         assert(file);
1733
1734         if (unit_name_to_type(file) != UNIT_TARGET)
1735                 return -EINVAL;
1736
1737         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1738         if (r < 0)
1739                 return r;
1740
1741         r = get_config_path(scope, false, root_dir, &config_path);
1742         if (r < 0)
1743                 return r;
1744
1745         r = install_info_add_auto(&c, file);
1746         if (r < 0)
1747                 return r;
1748
1749         assert_se(i = ordered_hashmap_first(c.will_install));
1750
1751         r = unit_file_search(&c, i, &paths, root_dir, false, true, NULL);
1752         if (r < 0)
1753                 return r;
1754
1755         path = strappenda(config_path, "/" SPECIAL_DEFAULT_TARGET);
1756
1757         r = create_symlink(i->path, path, force, changes, n_changes);
1758         if (r < 0)
1759                 return r;
1760
1761         return 0;
1762 }
1763
1764 int unit_file_get_default(
1765                 UnitFileScope scope,
1766                 const char *root_dir,
1767                 char **name) {
1768
1769         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1770         char **p;
1771         int r;
1772
1773         assert(scope >= 0);
1774         assert(scope < _UNIT_FILE_SCOPE_MAX);
1775         assert(name);
1776
1777         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1778         if (r < 0)
1779                 return r;
1780
1781         STRV_FOREACH(p, paths.unit_path) {
1782                 _cleanup_free_ char *path = NULL, *tmp = NULL;
1783                 char *n;
1784
1785                 path = path_join(root_dir, *p, SPECIAL_DEFAULT_TARGET);
1786                 if (!path)
1787                         return -ENOMEM;
1788
1789                 r = readlink_malloc(path, &tmp);
1790                 if (r == -ENOENT)
1791                         continue;
1792                 else if (r == -EINVAL)
1793                         /* not a symlink */
1794                         n = strdup(SPECIAL_DEFAULT_TARGET);
1795                 else if (r < 0)
1796                         return r;
1797                 else
1798                         n = strdup(basename(tmp));
1799
1800                 if (!n)
1801                         return -ENOMEM;
1802
1803                 *name = n;
1804                 return 0;
1805         }
1806
1807         return -ENOENT;
1808 }
1809
1810 UnitFileState unit_file_get_state(
1811                 UnitFileScope scope,
1812                 const char *root_dir,
1813                 const char *name) {
1814
1815         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1816         UnitFileState state = _UNIT_FILE_STATE_INVALID;
1817         char **i;
1818         _cleanup_free_ char *path = NULL;
1819         int r;
1820
1821         assert(scope >= 0);
1822         assert(scope < _UNIT_FILE_SCOPE_MAX);
1823         assert(name);
1824
1825         if (root_dir && scope != UNIT_FILE_SYSTEM)
1826                 return -EINVAL;
1827
1828         if (!unit_name_is_valid(name, TEMPLATE_VALID))
1829                 return -EINVAL;
1830
1831         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1832         if (r < 0)
1833                 return r;
1834
1835         STRV_FOREACH(i, paths.unit_path) {
1836                 struct stat st;
1837                 char *partial;
1838                 bool also = false;
1839
1840                 free(path);
1841                 path = NULL;
1842
1843                 path = path_join(root_dir, *i, name);
1844                 if (!path)
1845                         return -ENOMEM;
1846
1847                 if (root_dir)
1848                         partial = path + strlen(root_dir);
1849                 else
1850                         partial = path;
1851
1852                 /*
1853                  * Search for a unit file in our default paths, to
1854                  * be sure, that there are no broken symlinks.
1855                  */
1856                 if (lstat(path, &st) < 0) {
1857                         r = -errno;
1858                         if (errno != ENOENT)
1859                                 return r;
1860
1861                         if (!unit_name_is_instance(name))
1862                                 continue;
1863                 } else {
1864                         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
1865                                 return -ENOENT;
1866
1867                         r = null_or_empty_path(path);
1868                         if (r < 0 && r != -ENOENT)
1869                                 return r;
1870                         else if (r > 0) {
1871                                 state = path_startswith(*i, "/run") ?
1872                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
1873                                 return state;
1874                         }
1875                 }
1876
1877                 r = find_symlinks_in_scope(scope, root_dir, name, &state);
1878                 if (r < 0)
1879                         return r;
1880                 else if (r > 0)
1881                         return state;
1882
1883                 r = unit_file_can_install(&paths, root_dir, partial, true, &also);
1884                 if (r < 0 && errno != ENOENT)
1885                         return r;
1886                 else if (r > 0)
1887                         return UNIT_FILE_DISABLED;
1888                 else if (r == 0) {
1889                         if (also)
1890                                 return UNIT_FILE_INDIRECT;
1891                         return UNIT_FILE_STATIC;
1892                 }
1893         }
1894
1895         return r < 0 ? r : state;
1896 }
1897
1898 int unit_file_query_preset(UnitFileScope scope, const char *root_dir, const char *name) {
1899         _cleanup_strv_free_ char **files = NULL;
1900         char **p;
1901         int r;
1902
1903         assert(scope >= 0);
1904         assert(scope < _UNIT_FILE_SCOPE_MAX);
1905         assert(name);
1906
1907         if (scope == UNIT_FILE_SYSTEM)
1908                 r = conf_files_list(&files, ".preset", root_dir,
1909                                     "/etc/systemd/system-preset",
1910                                     "/usr/local/lib/systemd/system-preset",
1911                                     "/usr/lib/systemd/system-preset",
1912 #ifdef HAVE_SPLIT_USR
1913                                     "/lib/systemd/system-preset",
1914 #endif
1915                                     NULL);
1916         else if (scope == UNIT_FILE_GLOBAL)
1917                 r = conf_files_list(&files, ".preset", root_dir,
1918                                     "/etc/systemd/user-preset",
1919                                     "/usr/local/lib/systemd/user-preset",
1920                                     "/usr/lib/systemd/user-preset",
1921                                     NULL);
1922         else
1923                 return 1;
1924
1925         if (r < 0)
1926                 return r;
1927
1928         STRV_FOREACH(p, files) {
1929                 _cleanup_fclose_ FILE *f;
1930
1931                 f = fopen(*p, "re");
1932                 if (!f) {
1933                         if (errno == ENOENT)
1934                                 continue;
1935
1936                         return -errno;
1937                 }
1938
1939                 for (;;) {
1940                         char line[LINE_MAX], *l;
1941
1942                         if (!fgets(line, sizeof(line), f))
1943                                 break;
1944
1945                         l = strstrip(line);
1946                         if (!*l)
1947                                 continue;
1948
1949                         if (strchr(COMMENTS "\n", *l))
1950                                 continue;
1951
1952                         if (first_word(l, "enable")) {
1953                                 l += 6;
1954                                 l += strspn(l, WHITESPACE);
1955
1956                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1957                                         log_debug("Preset file says enable %s.", name);
1958                                         return 1;
1959                                 }
1960
1961                         } else if (first_word(l, "disable")) {
1962                                 l += 7;
1963                                 l += strspn(l, WHITESPACE);
1964
1965                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1966                                         log_debug("Preset file says disable %s.", name);
1967                                         return 0;
1968                                 }
1969
1970                         } else
1971                                 log_debug("Couldn't parse line '%s'", l);
1972                 }
1973         }
1974
1975         /* Default is "enable" */
1976         log_debug("Preset file doesn't say anything about %s, enabling.", name);
1977         return 1;
1978 }
1979
1980 int unit_file_preset(
1981                 UnitFileScope scope,
1982                 bool runtime,
1983                 const char *root_dir,
1984                 char **files,
1985                 UnitFilePresetMode mode,
1986                 bool force,
1987                 UnitFileChange **changes,
1988                 unsigned *n_changes) {
1989
1990         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
1991         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1992         _cleanup_free_ char *config_path = NULL;
1993         char **i;
1994         int r, q;
1995
1996         assert(scope >= 0);
1997         assert(scope < _UNIT_FILE_SCOPE_MAX);
1998         assert(mode < _UNIT_FILE_PRESET_MAX);
1999
2000         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2001         if (r < 0)
2002                 return r;
2003
2004         r = get_config_path(scope, runtime, root_dir, &config_path);
2005         if (r < 0)
2006                 return r;
2007
2008         STRV_FOREACH(i, files) {
2009
2010                 if (!unit_name_is_valid(*i, TEMPLATE_VALID))
2011                         return -EINVAL;
2012
2013                 r = unit_file_query_preset(scope, root_dir, *i);
2014                 if (r < 0)
2015                         return r;
2016
2017                 if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2018                         r = install_info_add_auto(&plus, *i);
2019                 else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2020                         r = install_info_add_auto(&minus, *i);
2021                 else
2022                         r = 0;
2023                 if (r < 0)
2024                         return r;
2025         }
2026
2027         r = 0;
2028
2029         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2030                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2031
2032                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2033
2034                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
2035                 if (r == 0)
2036                         r = q;
2037         }
2038
2039         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2040                 /* Returns number of symlinks that where supposed to be installed. */
2041                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2042                 if (r == 0)
2043                         r = q;
2044         }
2045
2046         return r;
2047 }
2048
2049 int unit_file_preset_all(
2050                 UnitFileScope scope,
2051                 bool runtime,
2052                 const char *root_dir,
2053                 UnitFilePresetMode mode,
2054                 bool force,
2055                 UnitFileChange **changes,
2056                 unsigned *n_changes) {
2057
2058         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
2059         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2060         _cleanup_free_ char *config_path = NULL;
2061         char **i;
2062         int r, q;
2063
2064         assert(scope >= 0);
2065         assert(scope < _UNIT_FILE_SCOPE_MAX);
2066         assert(mode < _UNIT_FILE_PRESET_MAX);
2067
2068         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2069         if (r < 0)
2070                 return r;
2071
2072         r = get_config_path(scope, runtime, root_dir, &config_path);
2073         if (r < 0)
2074                 return r;
2075
2076         STRV_FOREACH(i, paths.unit_path) {
2077                 _cleanup_closedir_ DIR *d = NULL;
2078                 _cleanup_free_ char *units_dir;
2079
2080                 units_dir = path_join(root_dir, *i, NULL);
2081                 if (!units_dir)
2082                         return -ENOMEM;
2083
2084                 d = opendir(units_dir);
2085                 if (!d) {
2086                         if (errno == ENOENT)
2087                                 continue;
2088
2089                         return -errno;
2090                 }
2091
2092                 for (;;) {
2093                         struct dirent *de;
2094
2095                         errno = 0;
2096                         de = readdir(d);
2097                         if (!de && errno != 0)
2098                                 return -errno;
2099
2100                         if (!de)
2101                                 break;
2102
2103                         if (ignore_file(de->d_name))
2104                                 continue;
2105
2106                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2107                                 continue;
2108
2109                         dirent_ensure_type(d, de);
2110
2111                         if (de->d_type != DT_REG)
2112                                 continue;
2113
2114                         r = unit_file_query_preset(scope, root_dir, de->d_name);
2115                         if (r < 0)
2116                                 return r;
2117
2118                         if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2119                                 r = install_info_add_auto(&plus, de->d_name);
2120                         else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2121                                 r = install_info_add_auto(&minus, de->d_name);
2122                         else
2123                                 r = 0;
2124                         if (r < 0)
2125                                 return r;
2126                 }
2127         }
2128
2129         r = 0;
2130
2131         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2132                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2133
2134                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2135
2136                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, NULL);
2137                 if (r == 0)
2138                         r = q;
2139         }
2140
2141         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2142                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2143                 if (r == 0)
2144                         r = q;
2145         }
2146
2147         return r;
2148 }
2149
2150 static void unit_file_list_free_one(UnitFileList *f) {
2151         if (!f)
2152                 return;
2153
2154         free(f->path);
2155         free(f);
2156 }
2157
2158 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
2159
2160 int unit_file_get_list(
2161                 UnitFileScope scope,
2162                 const char *root_dir,
2163                 Hashmap *h) {
2164
2165         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2166         char **i;
2167         int r;
2168
2169         assert(scope >= 0);
2170         assert(scope < _UNIT_FILE_SCOPE_MAX);
2171         assert(h);
2172
2173         if (root_dir && scope != UNIT_FILE_SYSTEM)
2174                 return -EINVAL;
2175
2176         if (root_dir) {
2177                 r = access(root_dir, F_OK);
2178                 if (r < 0)
2179                         return -errno;
2180         }
2181
2182         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2183         if (r < 0)
2184                 return r;
2185
2186         STRV_FOREACH(i, paths.unit_path) {
2187                 _cleanup_closedir_ DIR *d = NULL;
2188                 _cleanup_free_ char *units_dir;
2189
2190                 units_dir = path_join(root_dir, *i, NULL);
2191                 if (!units_dir)
2192                         return -ENOMEM;
2193
2194                 d = opendir(units_dir);
2195                 if (!d) {
2196                         if (errno == ENOENT)
2197                                 continue;
2198
2199                         return -errno;
2200                 }
2201
2202                 for (;;) {
2203                         _cleanup_(unit_file_list_free_onep) UnitFileList *f = NULL;
2204                         struct dirent *de;
2205                         _cleanup_free_ char *path = NULL;
2206
2207                         errno = 0;
2208                         de = readdir(d);
2209                         if (!de && errno != 0)
2210                                 return -errno;
2211
2212                         if (!de)
2213                                 break;
2214
2215                         if (ignore_file(de->d_name))
2216                                 continue;
2217
2218                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2219                                 continue;
2220
2221                         if (hashmap_get(h, de->d_name))
2222                                 continue;
2223
2224                         dirent_ensure_type(d, de);
2225
2226                         if (!IN_SET(de->d_type, DT_LNK, DT_REG))
2227                                 continue;
2228
2229                         f = new0(UnitFileList, 1);
2230                         if (!f)
2231                                 return -ENOMEM;
2232
2233                         f->path = path_make_absolute(de->d_name, units_dir);
2234                         if (!f->path)
2235                                 return -ENOMEM;
2236
2237                         r = null_or_empty_path(f->path);
2238                         if (r < 0 && r != -ENOENT)
2239                                 return r;
2240                         else if (r > 0) {
2241                                 f->state =
2242                                         path_startswith(*i, "/run") ?
2243                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
2244                                 goto found;
2245                         }
2246
2247                         r = find_symlinks_in_scope(scope, root_dir, de->d_name, &f->state);
2248                         if (r < 0)
2249                                 return r;
2250                         else if (r > 0) {
2251                                 f->state = UNIT_FILE_ENABLED;
2252                                 goto found;
2253                         }
2254
2255                         path = path_make_absolute(de->d_name, *i);
2256                         if (!path)
2257                                 return -ENOMEM;
2258
2259                         r = unit_file_can_install(&paths, root_dir, path, true, NULL);
2260                         if (r == -EINVAL ||  /* Invalid setting? */
2261                             r == -EBADMSG || /* Invalid format? */
2262                             r == -ENOENT     /* Included file not found? */)
2263                                 f->state = UNIT_FILE_INVALID;
2264                         else if (r < 0)
2265                                 return r;
2266                         else if (r > 0)
2267                                 f->state = UNIT_FILE_DISABLED;
2268                         else
2269                                 f->state = UNIT_FILE_STATIC;
2270
2271                 found:
2272                         r = hashmap_put(h, basename(f->path), f);
2273                         if (r < 0)
2274                                 return r;
2275                         f = NULL; /* prevent cleanup */
2276                 }
2277         }
2278
2279         return r;
2280 }
2281
2282 static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
2283         [UNIT_FILE_ENABLED] = "enabled",
2284         [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtime",
2285         [UNIT_FILE_LINKED] = "linked",
2286         [UNIT_FILE_LINKED_RUNTIME] = "linked-runtime",
2287         [UNIT_FILE_MASKED] = "masked",
2288         [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
2289         [UNIT_FILE_STATIC] = "static",
2290         [UNIT_FILE_DISABLED] = "disabled",
2291         [UNIT_FILE_INDIRECT] = "indirect",
2292         [UNIT_FILE_INVALID] = "invalid",
2293 };
2294
2295 DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
2296
2297 static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
2298         [UNIT_FILE_SYMLINK] = "symlink",
2299         [UNIT_FILE_UNLINK] = "unlink",
2300 };
2301
2302 DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
2303
2304 static const char* const unit_file_preset_mode_table[_UNIT_FILE_PRESET_MAX] = {
2305         [UNIT_FILE_PRESET_FULL] = "full",
2306         [UNIT_FILE_PRESET_ENABLE_ONLY] = "enable-only",
2307         [UNIT_FILE_PRESET_DISABLE_ONLY] = "disable-only",
2308 };
2309
2310 DEFINE_STRING_TABLE_LOOKUP(unit_file_preset_mode, UnitFilePresetMode);