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         free(i->default_instance);
 844         free(i);
 845 }
 846
 847 static void install_info_hashmap_free(OrderedHashmap *m) {
 848         InstallInfo *i;
 849
 850         if (!m)
 851                 return;
 852
 853         while ((i = ordered_hashmap_steal_first(m)))
 854                 install_info_free(i);
 855
 856         ordered_hashmap_free(m);
 857 }
 858
 859 static void install_context_done(InstallContext *c) {
 860         assert(c);
 861
 862         install_info_hashmap_free(c->will_install);
 863         install_info_hashmap_free(c->have_installed);
 864
 865         c->will_install = c->have_installed = NULL;
 866 }
 867
 868 static int install_info_add(
 869                 InstallContext *c,
 870                 const char *name,
 871                 const char *path) {
 872         InstallInfo *i = NULL;
 873         int r;
 874
 875         assert(c);
 876         assert(name || path);
 877
 878         if (!name)
 879                 name = basename(path);
 880
 881         if (!unit_name_is_valid(name, TEMPLATE_VALID))
 882                 return -EINVAL;
 883
 884         if (ordered_hashmap_get(c->have_installed, name) ||
 885             ordered_hashmap_get(c->will_install, name))
 886                 return 0;
 887
 888         r = ordered_hashmap_ensure_allocated(&c->will_install, &string_hash_ops);
 889         if (r < 0)
 890                 return r;
 891
 892         i = new0(InstallInfo, 1);
 893         if (!i)
 894                 return -ENOMEM;
 895
 896         i->name = strdup(name);
 897         if (!i->name) {
 898                 r = -ENOMEM;
 899                 goto fail;
 900         }
 901
 902         if (path) {
 903                 i->path = strdup(path);
 904                 if (!i->path) {
 905                         r = -ENOMEM;
 906                         goto fail;
 907                 }
 908         }
 909
 910         r = ordered_hashmap_put(c->will_install, i->name, i);
 911         if (r < 0)
 912                 goto fail;
 913
 914         return 0;
 915
 916 fail:
 917         if (i)
 918                 install_info_free(i);
 919
 920         return r;
 921 }
 922
 923 static int install_info_add_auto(
 924                 InstallContext *c,
 925                 const char *name_or_path) {
 926
 927         assert(c);
 928         assert(name_or_path);
 929
 930         if (path_is_absolute(name_or_path))
 931                 return install_info_add(c, NULL, name_or_path);
 932         else
 933                 return install_info_add(c, name_or_path, NULL);
 934 }
 935
 936 static int config_parse_also(
 937                 const char *unit,
 938                 const char *filename,
 939                 unsigned line,
 940                 const char *section,
 941                 unsigned section_line,
 942                 const char *lvalue,
 943                 int ltype,
 944                 const char *rvalue,
 945                 void *data,
 946                 void *userdata) {
 947
 948         size_t l;
 949         const char *word, *state;
 950         InstallContext *c = data;
 951
 952         assert(filename);
 953         assert(lvalue);
 954         assert(rvalue);
 955
 956         FOREACH_WORD_QUOTED(word, l, rvalue, state) {
 957                 _cleanup_free_ char *n;
 958                 int r;
 959
 960                 n = strndup(word, l);
 961                 if (!n)
 962                         return -ENOMEM;
 963
 964                 r = install_info_add(c, n, NULL);
 965                 if (r < 0)
 966                         return r;
 967         }
 968         if (!isempty(state))
 969                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 970                            "Trailing garbage, ignoring.");
 971
 972         return 0;
 973 }
 974
 975 static int config_parse_user(
 976                 const char *unit,
 977                 const char *filename,
 978                 unsigned line,
 979                 const char *section,
 980                 unsigned section_line,
 981                 const char *lvalue,
 982                 int ltype,
 983                 const char *rvalue,
 984                 void *data,
 985                 void *userdata) {
 986
 987         InstallInfo *i = data;
 988         char *printed;
 989         int r;
 990
 991         assert(filename);
 992         assert(lvalue);
 993         assert(rvalue);
 994
 995         r = install_full_printf(i, rvalue, &printed);
 996         if (r < 0)
 997                 return r;
 998
 999         free(i->user);
1000         i->user = printed;
1001
1002         return 0;
1003 }
1004
1005 static int config_parse_default_instance(
1006                 const char *unit,
1007                 const char *filename,
1008                 unsigned line,
1009                 const char *section,
1010                 unsigned section_line,
1011                 const char *lvalue,
1012                 int ltype,
1013                 const char *rvalue,
1014                 void *data,
1015                 void *userdata) {
1016
1017         InstallInfo *i = data;
1018         char *printed;
1019         int r;
1020
1021         assert(filename);
1022         assert(lvalue);
1023         assert(rvalue);
1024
1025         r = install_full_printf(i, rvalue, &printed);
1026         if (r < 0)
1027                 return r;
1028
1029         if (!unit_instance_is_valid(printed)) {
1030                 free(printed);
1031                 return -EINVAL;
1032         }
1033
1034         free(i->default_instance);
1035         i->default_instance = printed;
1036
1037         return 0;
1038 }
1039
1040 static int unit_file_load(
1041                 InstallContext *c,
1042                 InstallInfo *info,
1043                 const char *path,
1044                 const char *root_dir,
1045                 bool allow_symlink,
1046                 bool load) {
1047
1048         const ConfigTableItem items[] = {
1049                 { "Install", "Alias",           config_parse_strv,             0, &info->aliases           },
1050                 { "Install", "WantedBy",        config_parse_strv,             0, &info->wanted_by         },
1051                 { "Install", "RequiredBy",      config_parse_strv,             0, &info->required_by       },
1052                 { "Install", "DefaultInstance", config_parse_default_instance, 0, info                     },
1053                 { "Install", "Also",            config_parse_also,             0, c                        },
1054                 { "Exec",    "User",            config_parse_user,             0, info                     },
1055                 {}
1056         };
1057
1058         _cleanup_fclose_ FILE *f = NULL;
1059         int fd, r;
1060
1061         assert(c);
1062         assert(info);
1063         assert(path);
1064
1065         if (!isempty(root_dir))
1066                 path = strappenda(root_dir, "/", path);
1067
1068         if (!load) {
1069                 r = access(path, F_OK) ? -errno : 0;
1070                 return r;
1071         }
1072
1073         fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|(allow_symlink ? 0 : O_NOFOLLOW));
1074         if (fd < 0)
1075                 return -errno;
1076
1077         f = fdopen(fd, "re");
1078         if (!f) {
1079                 safe_close(fd);
1080                 return -ENOMEM;
1081         }
1082
1083         r = config_parse(NULL, path, f,
1084                          NULL,
1085                          config_item_table_lookup, items,
1086                          true, true, false, info);
1087         if (r < 0)
1088                 return r;
1089
1090         return
1091                 (int) strv_length(info->aliases) +
1092                 (int) strv_length(info->wanted_by) +
1093                 (int) strv_length(info->required_by);
1094 }
1095
1096 static int unit_file_search(
1097                 InstallContext *c,
1098                 InstallInfo *info,
1099                 LookupPaths *paths,
1100                 const char *root_dir,
1101                 bool allow_symlink,
1102                 bool load) {
1103
1104         char **p;
1105         int r;
1106
1107         assert(c);
1108         assert(info);
1109         assert(paths);
1110
1111         if (info->path)
1112                 return unit_file_load(c, info, info->path, root_dir, allow_symlink, load);
1113
1114         assert(info->name);
1115
1116         STRV_FOREACH(p, paths->unit_path) {
1117                 _cleanup_free_ char *path = NULL;
1118
1119                 path = strjoin(*p, "/", info->name, NULL);
1120                 if (!path)
1121                         return -ENOMEM;
1122
1123                 r = unit_file_load(c, info, path, root_dir, allow_symlink, load);
1124                 if (r >= 0) {
1125                         info->path = path;
1126                         path = NULL;
1127                         return r;
1128                 }
1129                 if (r != -ENOENT && r != -ELOOP)
1130                         return r;
1131         }
1132
1133         if (unit_name_is_instance(info->name)) {
1134
1135                 /* Unit file doesn't exist, however instance
1136                  * enablement was requested.  We will check if it is
1137                  * possible to load template unit file. */
1138
1139                 _cleanup_free_ char *template = NULL;
1140
1141                 template = unit_name_template(info->name);
1142                 if (!template)
1143                         return -ENOMEM;
1144
1145                 STRV_FOREACH(p, paths->unit_path) {
1146                         _cleanup_free_ char *path = NULL;
1147
1148                         path = strjoin(*p, "/", template, NULL);
1149                         if (!path)
1150                                 return -ENOMEM;
1151
1152                         r = unit_file_load(c, info, path, root_dir, allow_symlink, load);
1153                         if (r >= 0) {
1154                                 info->path = path;
1155                                 path = NULL;
1156                                 return r;
1157                         }
1158                         if (r != -ENOENT && r != -ELOOP)
1159                                 return r;
1160                 }
1161         }
1162
1163         return -ENOENT;
1164 }
1165
1166 static int unit_file_can_install(
1167                 LookupPaths *paths,
1168                 const char *root_dir,
1169                 const char *name,
1170                 bool allow_symlink) {
1171
1172         _cleanup_(install_context_done) InstallContext c = {};
1173         InstallInfo *i;
1174         int r;
1175
1176         assert(paths);
1177         assert(name);
1178
1179         r = install_info_add_auto(&c, name);
1180         if (r < 0)
1181                 return r;
1182
1183         assert_se(i = ordered_hashmap_first(c.will_install));
1184
1185         r = unit_file_search(&c, i, paths, root_dir, allow_symlink, true);
1186
1187         if (r >= 0)
1188                 r =
1189                         (int) strv_length(i->aliases) +
1190                         (int) strv_length(i->wanted_by) +
1191                         (int) strv_length(i->required_by);
1192
1193         return r;
1194 }
1195
1196 static int create_symlink(
1197                 const char *old_path,
1198                 const char *new_path,
1199                 bool force,
1200                 UnitFileChange **changes,
1201                 unsigned *n_changes) {
1202
1203         _cleanup_free_ char *dest = NULL;
1204         int r;
1205
1206         assert(old_path);
1207         assert(new_path);
1208
1209         mkdir_parents_label(new_path, 0755);
1210
1211         if (symlink(old_path, new_path) >= 0) {
1212                 add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
1213                 return 0;
1214         }
1215
1216         if (errno != EEXIST)
1217                 return -errno;
1218
1219         r = readlink_and_make_absolute(new_path, &dest);
1220         if (r < 0)
1221                 return r;
1222
1223         if (path_equal(dest, old_path))
1224                 return 0;
1225
1226         if (!force)
1227                 return -EEXIST;
1228
1229         r = symlink_atomic(old_path, new_path);
1230         if (r < 0)
1231                 return r;
1232
1233         add_file_change(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);
1234         add_file_change(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
1235
1236         return 0;
1237 }
1238
1239 static int install_info_symlink_alias(
1240                 InstallInfo *i,
1241                 const char *config_path,
1242                 bool force,
1243                 UnitFileChange **changes,
1244                 unsigned *n_changes) {
1245
1246         char **s;
1247         int r = 0, q;
1248
1249         assert(i);
1250         assert(config_path);
1251
1252         STRV_FOREACH(s, i->aliases) {
1253                 _cleanup_free_ char *alias_path = NULL, *dst = NULL;
1254
1255                 q = install_full_printf(i, *s, &dst);
1256                 if (q < 0)
1257                         return q;
1258
1259                 alias_path = path_make_absolute(dst, config_path);
1260                 if (!alias_path)
1261                         return -ENOMEM;
1262
1263                 q = create_symlink(i->path, alias_path, force, changes, n_changes);
1264                 if (r == 0)
1265                         r = q;
1266         }
1267
1268         return r;
1269 }
1270
1271 static int install_info_symlink_wants(
1272                 InstallInfo *i,
1273                 const char *config_path,
1274                 char **list,
1275                 const char *suffix,
1276                 bool force,
1277                 UnitFileChange **changes,
1278                 unsigned *n_changes) {
1279
1280         _cleanup_free_ char *buf = NULL;
1281         const char *n;
1282         char **s;
1283         int r = 0, q;
1284
1285         assert(i);
1286         assert(config_path);
1287
1288         if (unit_name_is_template(i->name)) {
1289
1290                 /* Don't install any symlink if there's no default
1291                  * instance configured */
1292
1293                 if (!i->default_instance)
1294                         return 0;
1295
1296                 buf = unit_name_replace_instance(i->name, i->default_instance);
1297                 if (!buf)
1298                         return -ENOMEM;
1299
1300                 n = buf;
1301         } else
1302                 n = i->name;
1303
1304         STRV_FOREACH(s, list) {
1305                 _cleanup_free_ char *path = NULL, *dst = NULL;
1306
1307                 q = install_full_printf(i, *s, &dst);
1308                 if (q < 0)
1309                         return q;
1310
1311                 if (!unit_name_is_valid(dst, TEMPLATE_VALID)) {
1312                         r = -EINVAL;
1313                         continue;
1314                 }
1315
1316                 path = strjoin(config_path, "/", dst, suffix, n, NULL);
1317                 if (!path)
1318                         return -ENOMEM;
1319
1320                 q = create_symlink(i->path, path, force, changes, n_changes);
1321                 if (r == 0)
1322                         r = q;
1323         }
1324
1325         return r;
1326 }
1327
1328 static int install_info_symlink_link(
1329                 InstallInfo *i,
1330                 LookupPaths *paths,
1331                 const char *config_path,
1332                 const char *root_dir,
1333                 bool force,
1334                 UnitFileChange **changes,
1335                 unsigned *n_changes) {
1336
1337         _cleanup_free_ char *path = NULL;
1338         int r;
1339
1340         assert(i);
1341         assert(paths);
1342         assert(config_path);
1343         assert(i->path);
1344
1345         r = in_search_path(i->path, paths->unit_path);
1346         if (r != 0)
1347                 return r;
1348
1349         path = strjoin(config_path, "/", i->name, NULL);
1350         if (!path)
1351                 return -ENOMEM;
1352
1353         return create_symlink(i->path, path, force, changes, n_changes);
1354 }
1355
1356 static int install_info_apply(
1357                 InstallInfo *i,
1358                 LookupPaths *paths,
1359                 const char *config_path,
1360                 const char *root_dir,
1361                 bool force,
1362                 UnitFileChange **changes,
1363                 unsigned *n_changes) {
1364
1365         int r, q;
1366
1367         assert(i);
1368         assert(paths);
1369         assert(config_path);
1370
1371         r = install_info_symlink_alias(i, config_path, force, changes, n_changes);
1372
1373         q = install_info_symlink_wants(i, config_path, i->wanted_by, ".wants/", force, changes, n_changes);
1374         if (r == 0)
1375                 r = q;
1376
1377         q = install_info_symlink_wants(i, config_path, i->required_by, ".requires/", force, changes, n_changes);
1378         if (r == 0)
1379                 r = q;
1380
1381         q = install_info_symlink_link(i, paths, config_path, root_dir, force, changes, n_changes);
1382         if (r == 0)
1383                 r = q;
1384
1385         return r;
1386 }
1387
1388 static int install_context_apply(
1389                 InstallContext *c,
1390                 LookupPaths *paths,
1391                 const char *config_path,
1392                 const char *root_dir,
1393                 bool force,
1394                 UnitFileChange **changes,
1395                 unsigned *n_changes) {
1396
1397         InstallInfo *i;
1398         int r, q;
1399
1400         assert(c);
1401         assert(paths);
1402         assert(config_path);
1403
1404         if (!ordered_hashmap_isempty(c->will_install)) {
1405                 r = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1406                 if (r < 0)
1407                         return r;
1408
1409                 r = ordered_hashmap_reserve(c->have_installed, ordered_hashmap_size(c->will_install));
1410                 if (r < 0)
1411                         return r;
1412         }
1413
1414         r = 0;
1415         while ((i = ordered_hashmap_first(c->will_install))) {
1416                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1417
1418                 q = unit_file_search(c, i, paths, root_dir, false, true);
1419                 if (q < 0) {
1420                         if (r >= 0)
1421                                 r = q;
1422
1423                         return r;
1424                 } else if (r >= 0)
1425                         r += q;
1426
1427                 q = install_info_apply(i, paths, config_path, root_dir, force, changes, n_changes);
1428                 if (r >= 0 && q < 0)
1429                         r = q;
1430         }
1431
1432         return r;
1433 }
1434
1435 static int install_context_mark_for_removal(
1436                 InstallContext *c,
1437                 LookupPaths *paths,
1438                 Set **remove_symlinks_to,
1439                 const char *config_path,
1440                 const char *root_dir) {
1441
1442         InstallInfo *i;
1443         int r, q;
1444
1445         assert(c);
1446         assert(paths);
1447         assert(config_path);
1448
1449         /* Marks all items for removal */
1450
1451         if (!ordered_hashmap_isempty(c->will_install)) {
1452                 r = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1453                 if (r < 0)
1454                         return r;
1455
1456                 r = ordered_hashmap_reserve(c->have_installed, ordered_hashmap_size(c->will_install));
1457                 if (r < 0)
1458                         return r;
1459         }
1460
1461         r = 0;
1462         while ((i = ordered_hashmap_first(c->will_install))) {
1463                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1464
1465                 q = unit_file_search(c, i, paths, root_dir, false, true);
1466                 if (q == -ENOENT) {
1467                         /* do nothing */
1468                 } else if (q < 0) {
1469                         if (r >= 0)
1470                                 r = q;
1471
1472                         return r;
1473                 } else if (r >= 0)
1474                         r += q;
1475
1476                 if (unit_name_is_instance(i->name)) {
1477                         char *unit_file;
1478
1479                         if (i->path) {
1480                                 unit_file = basename(i->path);
1481
1482                                 if (unit_name_is_instance(unit_file))
1483                                         /* unit file named as instance exists, thus all symlinks
1484                                          * pointing to it will be removed */
1485                                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1486                                 else
1487                                         /* does not exist, thus we will mark for removal symlinks
1488                                          * to template unit file */
1489                                         q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1490                         } else {
1491                                 /* If i->path is not set, it means that we didn't actually find
1492                                  * the unit file. But we can still remove symlinks to the
1493                                  * nonexistent template. */
1494                                 unit_file = unit_name_template(i->name);
1495                                 if (!unit_file)
1496                                         return log_oom();
1497
1498                                 q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1499                                 free(unit_file);
1500                         }
1501                 } else
1502                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1503
1504                 if (r >= 0 && q < 0)
1505                         r = q;
1506         }
1507
1508         return r;
1509 }
1510
1511 int unit_file_add_dependency(
1512                 UnitFileScope scope,
1513                 bool runtime,
1514                 const char *root_dir,
1515                 char **files,
1516                 char *target,
1517                 UnitDependency dep,
1518                 bool force,
1519                 UnitFileChange **changes,
1520                 unsigned *n_changes) {
1521
1522         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1523         _cleanup_(install_context_done) InstallContext c = {};
1524         _cleanup_free_ char *config_path = NULL;
1525         char **i;
1526         int r;
1527         InstallInfo *info;
1528
1529         assert(scope >= 0);
1530         assert(scope < _UNIT_FILE_SCOPE_MAX);
1531
1532         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1533         if (r < 0)
1534                 return r;
1535
1536         r = get_config_path(scope, runtime, root_dir, &config_path);
1537         if (r < 0)
1538                 return r;
1539
1540         STRV_FOREACH(i, files) {
1541                 UnitFileState state;
1542
1543                 state = unit_file_get_state(scope, root_dir, *i);
1544                 if (state < 0) {
1545                         log_error("Failed to get unit file state for %s: %s", *i, strerror(-state));
1546                         return state;
1547                 }
1548
1549                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1550                         log_error("Failed to enable unit: Unit %s is masked", *i);
1551                         return -ENOTSUP;
1552                 }
1553
1554                 r = install_info_add_auto(&c, *i);
1555                 if (r < 0)
1556                         return r;
1557         }
1558
1559         if (!ordered_hashmap_isempty(c.will_install)) {
1560                 r = ordered_hashmap_ensure_allocated(&c.have_installed, &string_hash_ops);
1561                 if (r < 0)
1562                         return r;
1563
1564                 r = ordered_hashmap_reserve(c.have_installed, ordered_hashmap_size(c.will_install));
1565                 if (r < 0)
1566                         return r;
1567         }
1568
1569         while ((info = ordered_hashmap_first(c.will_install))) {
1570                 assert_se(ordered_hashmap_move_one(c.have_installed, c.will_install, info->name) == 0);
1571
1572                 r = unit_file_search(&c, info, &paths, root_dir, false, false);
1573                 if (r < 0)
1574                         return r;
1575
1576                 if (dep == UNIT_WANTS)
1577                         r = strv_extend(&info->wanted_by, target);
1578                 else if (dep == UNIT_REQUIRES)
1579                         r = strv_extend(&info->required_by, target);
1580                 else
1581                         r = -EINVAL;
1582
1583                 if (r < 0)
1584                         return r;
1585
1586                 r = install_info_apply(info, &paths, config_path, root_dir, force, changes, n_changes);
1587                 if (r < 0)
1588                         return r;
1589         }
1590
1591         return 0;
1592 }
1593
1594 int unit_file_enable(
1595                 UnitFileScope scope,
1596                 bool runtime,
1597                 const char *root_dir,
1598                 char **files,
1599                 bool force,
1600                 UnitFileChange **changes,
1601                 unsigned *n_changes) {
1602
1603         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1604         _cleanup_(install_context_done) InstallContext c = {};
1605         char **i;
1606         _cleanup_free_ char *config_path = NULL;
1607         int r;
1608
1609         assert(scope >= 0);
1610         assert(scope < _UNIT_FILE_SCOPE_MAX);
1611
1612         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1613         if (r < 0)
1614                 return r;
1615
1616         r = get_config_path(scope, runtime, root_dir, &config_path);
1617         if (r < 0)
1618                 return r;
1619
1620         STRV_FOREACH(i, files) {
1621                 UnitFileState state;
1622
1623                 /* We only want to know if this unit is masked, so we ignore
1624                  * errors from unit_file_get_state, deferring other checks.
1625                  * This allows templated units to be enabled on the fly. */
1626                 state = unit_file_get_state(scope, root_dir, *i);
1627                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1628                         log_error("Failed to enable unit: Unit %s is masked", *i);
1629                         return -ENOTSUP;
1630                 }
1631
1632                 r = install_info_add_auto(&c, *i);
1633                 if (r < 0)
1634                         return r;
1635         }
1636
1637         /* This will return the number of symlink rules that were
1638         supposed to be created, not the ones actually created. This is
1639         useful to determine whether the passed files had any
1640         installation data at all. */
1641
1642         return install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
1643 }
1644
1645 int unit_file_disable(
1646                 UnitFileScope scope,
1647                 bool runtime,
1648                 const char *root_dir,
1649                 char **files,
1650                 UnitFileChange **changes,
1651                 unsigned *n_changes) {
1652
1653         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1654         _cleanup_(install_context_done) InstallContext c = {};
1655         char **i;
1656         _cleanup_free_ char *config_path = NULL;
1657         _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
1658         int r, q;
1659
1660         assert(scope >= 0);
1661         assert(scope < _UNIT_FILE_SCOPE_MAX);
1662
1663         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1664         if (r < 0)
1665                 return r;
1666
1667         r = get_config_path(scope, runtime, root_dir, &config_path);
1668         if (r < 0)
1669                 return r;
1670
1671         STRV_FOREACH(i, files) {
1672                 r = install_info_add_auto(&c, *i);
1673                 if (r < 0)
1674                         return r;
1675         }
1676
1677         r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
1678
1679         q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
1680         if (r >= 0)
1681                 r = q;
1682
1683         return r;
1684 }
1685
1686 int unit_file_reenable(
1687                 UnitFileScope scope,
1688                 bool runtime,
1689                 const char *root_dir,
1690                 char **files,
1691                 bool force,
1692                 UnitFileChange **changes,
1693                 unsigned *n_changes) {
1694         int r;
1695
1696         r = unit_file_disable(scope, runtime, root_dir, files,
1697                               changes, n_changes);
1698         if (r < 0)
1699                 return r;
1700
1701         return unit_file_enable(scope, runtime, root_dir, files, force,
1702                                 changes, n_changes);
1703 }
1704
1705 int unit_file_set_default(
1706                 UnitFileScope scope,
1707                 const char *root_dir,
1708                 const char *file,
1709                 bool force,
1710                 UnitFileChange **changes,
1711                 unsigned *n_changes) {
1712
1713         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1714         _cleanup_(install_context_done) InstallContext c = {};
1715         _cleanup_free_ char *config_path = NULL;
1716         char *path;
1717         int r;
1718         InstallInfo *i = NULL;
1719
1720         assert(scope >= 0);
1721         assert(scope < _UNIT_FILE_SCOPE_MAX);
1722         assert(file);
1723
1724         if (unit_name_to_type(file) != UNIT_TARGET)
1725                 return -EINVAL;
1726
1727         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1728         if (r < 0)
1729                 return r;
1730
1731         r = get_config_path(scope, false, root_dir, &config_path);
1732         if (r < 0)
1733                 return r;
1734
1735         r = install_info_add_auto(&c, file);
1736         if (r < 0)
1737                 return r;
1738
1739         assert_se(i = ordered_hashmap_first(c.will_install));
1740
1741         r = unit_file_search(&c, i, &paths, root_dir, false, true);
1742         if (r < 0)
1743                 return r;
1744
1745         path = strappenda(config_path, "/" SPECIAL_DEFAULT_TARGET);
1746
1747         r = create_symlink(i->path, path, force, changes, n_changes);
1748         if (r < 0)
1749                 return r;
1750
1751         return 0;
1752 }
1753
1754 int unit_file_get_default(
1755                 UnitFileScope scope,
1756                 const char *root_dir,
1757                 char **name) {
1758
1759         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1760         char **p;
1761         int r;
1762
1763         assert(scope >= 0);
1764         assert(scope < _UNIT_FILE_SCOPE_MAX);
1765         assert(name);
1766
1767         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1768         if (r < 0)
1769                 return r;
1770
1771         STRV_FOREACH(p, paths.unit_path) {
1772                 _cleanup_free_ char *path = NULL, *tmp = NULL;
1773                 char *n;
1774
1775                 path = path_join(root_dir, *p, SPECIAL_DEFAULT_TARGET);
1776                 if (!path)
1777                         return -ENOMEM;
1778
1779                 r = readlink_malloc(path, &tmp);
1780                 if (r == -ENOENT)
1781                         continue;
1782                 else if (r == -EINVAL)
1783                         /* not a symlink */
1784                         n = strdup(SPECIAL_DEFAULT_TARGET);
1785                 else if (r < 0)
1786                         return r;
1787                 else
1788                         n = strdup(basename(tmp));
1789
1790                 if (!n)
1791                         return -ENOMEM;
1792
1793                 *name = n;
1794                 return 0;
1795         }
1796
1797         return -ENOENT;
1798 }
1799
1800 UnitFileState unit_file_get_state(
1801                 UnitFileScope scope,
1802                 const char *root_dir,
1803                 const char *name) {
1804
1805         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1806         UnitFileState state = _UNIT_FILE_STATE_INVALID;
1807         char **i;
1808         _cleanup_free_ char *path = NULL;
1809         int r;
1810
1811         assert(scope >= 0);
1812         assert(scope < _UNIT_FILE_SCOPE_MAX);
1813         assert(name);
1814
1815         if (root_dir && scope != UNIT_FILE_SYSTEM)
1816                 return -EINVAL;
1817
1818         if (!unit_name_is_valid(name, TEMPLATE_VALID))
1819                 return -EINVAL;
1820
1821         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1822         if (r < 0)
1823                 return r;
1824
1825         STRV_FOREACH(i, paths.unit_path) {
1826                 struct stat st;
1827                 char *partial;
1828
1829                 free(path);
1830                 path = NULL;
1831
1832                 path = path_join(root_dir, *i, name);
1833                 if (!path)
1834                         return -ENOMEM;
1835
1836                 if (root_dir)
1837                         partial = path + strlen(root_dir);
1838                 else
1839                         partial = path;
1840
1841                 /*
1842                  * Search for a unit file in our default paths, to
1843                  * be sure, that there are no broken symlinks.
1844                  */
1845                 if (lstat(path, &st) < 0) {
1846                         r = -errno;
1847                         if (errno != ENOENT)
1848                                 return r;
1849
1850                         if (!unit_name_is_instance(name))
1851                                 continue;
1852                 } else {
1853                         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
1854                                 return -ENOENT;
1855
1856                         r = null_or_empty_path(path);
1857                         if (r < 0 && r != -ENOENT)
1858                                 return r;
1859                         else if (r > 0) {
1860                                 state = path_startswith(*i, "/run") ?
1861                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
1862                                 return state;
1863                         }
1864                 }
1865
1866                 r = find_symlinks_in_scope(scope, root_dir, name, &state);
1867                 if (r < 0)
1868                         return r;
1869                 else if (r > 0)
1870                         return state;
1871
1872                 r = unit_file_can_install(&paths, root_dir, partial, true);
1873                 if (r < 0 && errno != ENOENT)
1874                         return r;
1875                 else if (r > 0)
1876                         return UNIT_FILE_DISABLED;
1877                 else if (r == 0)
1878                         return UNIT_FILE_STATIC;
1879         }
1880
1881         return r < 0 ? r : state;
1882 }
1883
1884 int unit_file_query_preset(UnitFileScope scope, const char *root_dir, const char *name) {
1885         _cleanup_strv_free_ char **files = NULL;
1886         char **p;
1887         int r;
1888
1889         assert(scope >= 0);
1890         assert(scope < _UNIT_FILE_SCOPE_MAX);
1891         assert(name);
1892
1893         if (scope == UNIT_FILE_SYSTEM)
1894                 r = conf_files_list(&files, ".preset", root_dir,
1895                                     "/etc/systemd/system-preset",
1896                                     "/usr/local/lib/systemd/system-preset",
1897                                     "/usr/lib/systemd/system-preset",
1898 #ifdef HAVE_SPLIT_USR
1899                                     "/lib/systemd/system-preset",
1900 #endif
1901                                     NULL);
1902         else if (scope == UNIT_FILE_GLOBAL)
1903                 r = conf_files_list(&files, ".preset", root_dir,
1904                                     "/etc/systemd/user-preset",
1905                                     "/usr/local/lib/systemd/user-preset",
1906                                     "/usr/lib/systemd/user-preset",
1907                                     NULL);
1908         else
1909                 return 1;
1910
1911         if (r < 0)
1912                 return r;
1913
1914         STRV_FOREACH(p, files) {
1915                 _cleanup_fclose_ FILE *f;
1916
1917                 f = fopen(*p, "re");
1918                 if (!f) {
1919                         if (errno == ENOENT)
1920                                 continue;
1921
1922                         return -errno;
1923                 }
1924
1925                 for (;;) {
1926                         char line[LINE_MAX], *l;
1927
1928                         if (!fgets(line, sizeof(line), f))
1929                                 break;
1930
1931                         l = strstrip(line);
1932                         if (!*l)
1933                                 continue;
1934
1935                         if (strchr(COMMENTS "\n", *l))
1936                                 continue;
1937
1938                         if (first_word(l, "enable")) {
1939                                 l += 6;
1940                                 l += strspn(l, WHITESPACE);
1941
1942                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1943                                         log_debug("Preset file says enable %s.", name);
1944                                         return 1;
1945                                 }
1946
1947                         } else if (first_word(l, "disable")) {
1948                                 l += 7;
1949                                 l += strspn(l, WHITESPACE);
1950
1951                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1952                                         log_debug("Preset file says disable %s.", name);
1953                                         return 0;
1954                                 }
1955
1956                         } else
1957                                 log_debug("Couldn't parse line '%s'", l);
1958                 }
1959         }
1960
1961         /* Default is "enable" */
1962         log_debug("Preset file doesn't say anything about %s, enabling.", name);
1963         return 1;
1964 }
1965
1966 int unit_file_preset(
1967                 UnitFileScope scope,
1968                 bool runtime,
1969                 const char *root_dir,
1970                 char **files,
1971                 UnitFilePresetMode mode,
1972                 bool force,
1973                 UnitFileChange **changes,
1974                 unsigned *n_changes) {
1975
1976         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
1977         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1978         _cleanup_free_ char *config_path = NULL;
1979         char **i;
1980         int r, q;
1981
1982         assert(scope >= 0);
1983         assert(scope < _UNIT_FILE_SCOPE_MAX);
1984         assert(mode < _UNIT_FILE_PRESET_MAX);
1985
1986         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1987         if (r < 0)
1988                 return r;
1989
1990         r = get_config_path(scope, runtime, root_dir, &config_path);
1991         if (r < 0)
1992                 return r;
1993
1994         STRV_FOREACH(i, files) {
1995
1996                 if (!unit_name_is_valid(*i, TEMPLATE_VALID))
1997                         return -EINVAL;
1998
1999                 r = unit_file_query_preset(scope, root_dir, *i);
2000                 if (r < 0)
2001                         return r;
2002
2003                 if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2004                         r = install_info_add_auto(&plus, *i);
2005                 else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2006                         r = install_info_add_auto(&minus, *i);
2007                 else
2008                         r = 0;
2009                 if (r < 0)
2010                         return r;
2011         }
2012
2013         r = 0;
2014
2015         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2016                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2017
2018                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2019
2020                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
2021                 if (r == 0)
2022                         r = q;
2023         }
2024
2025         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2026                 /* Returns number of symlinks that where supposed to be installed. */
2027                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2028                 if (r == 0)
2029                         r = q;
2030         }
2031
2032         return r;
2033 }
2034
2035 int unit_file_preset_all(
2036                 UnitFileScope scope,
2037                 bool runtime,
2038                 const char *root_dir,
2039                 UnitFilePresetMode mode,
2040                 bool force,
2041                 UnitFileChange **changes,
2042                 unsigned *n_changes) {
2043
2044         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
2045         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2046         _cleanup_free_ char *config_path = NULL;
2047         char **i;
2048         int r, q;
2049
2050         assert(scope >= 0);
2051         assert(scope < _UNIT_FILE_SCOPE_MAX);
2052         assert(mode < _UNIT_FILE_PRESET_MAX);
2053
2054         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2055         if (r < 0)
2056                 return r;
2057
2058         r = get_config_path(scope, runtime, root_dir, &config_path);
2059         if (r < 0)
2060                 return r;
2061
2062         STRV_FOREACH(i, paths.unit_path) {
2063                 _cleanup_closedir_ DIR *d = NULL;
2064                 _cleanup_free_ char *units_dir;
2065
2066                 units_dir = path_join(root_dir, *i, NULL);
2067                 if (!units_dir)
2068                         return -ENOMEM;
2069
2070                 d = opendir(units_dir);
2071                 if (!d) {
2072                         if (errno == ENOENT)
2073                                 continue;
2074
2075                         return -errno;
2076                 }
2077
2078                 for (;;) {
2079                         struct dirent *de;
2080
2081                         errno = 0;
2082                         de = readdir(d);
2083                         if (!de && errno != 0)
2084                                 return -errno;
2085
2086                         if (!de)
2087                                 break;
2088
2089                         if (ignore_file(de->d_name))
2090                                 continue;
2091
2092                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2093                                 continue;
2094
2095                         dirent_ensure_type(d, de);
2096
2097                         if (de->d_type != DT_REG)
2098                                 continue;
2099
2100                         r = unit_file_query_preset(scope, root_dir, de->d_name);
2101                         if (r < 0)
2102                                 return r;
2103
2104                         if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2105                                 r = install_info_add_auto(&plus, de->d_name);
2106                         else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2107                                 r = install_info_add_auto(&minus, de->d_name);
2108                         else
2109                                 r = 0;
2110                         if (r < 0)
2111                                 return r;
2112                 }
2113         }
2114
2115         r = 0;
2116
2117         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2118                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2119
2120                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2121
2122                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, NULL);
2123                 if (r == 0)
2124                         r = q;
2125         }
2126
2127         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2128                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2129                 if (r == 0)
2130                         r = q;
2131         }
2132
2133         return r;
2134 }
2135
2136 static void unit_file_list_free_one(UnitFileList *f) {
2137         if (!f)
2138                 return;
2139
2140         free(f->path);
2141         free(f);
2142 }
2143
2144 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
2145
2146 int unit_file_get_list(
2147                 UnitFileScope scope,
2148                 const char *root_dir,
2149                 Hashmap *h) {
2150
2151         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2152         char **i;
2153         int r;
2154
2155         assert(scope >= 0);
2156         assert(scope < _UNIT_FILE_SCOPE_MAX);
2157         assert(h);
2158
2159         if (root_dir && scope != UNIT_FILE_SYSTEM)
2160                 return -EINVAL;
2161
2162         if (root_dir) {
2163                 r = access(root_dir, F_OK);
2164                 if (r < 0)
2165                         return -errno;
2166         }
2167
2168         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2169         if (r < 0)
2170                 return r;
2171
2172         STRV_FOREACH(i, paths.unit_path) {
2173                 _cleanup_closedir_ DIR *d = NULL;
2174                 _cleanup_free_ char *units_dir;
2175
2176                 units_dir = path_join(root_dir, *i, NULL);
2177                 if (!units_dir)
2178                         return -ENOMEM;
2179
2180                 d = opendir(units_dir);
2181                 if (!d) {
2182                         if (errno == ENOENT)
2183                                 continue;
2184
2185                         return -errno;
2186                 }
2187
2188                 for (;;) {
2189                         _cleanup_(unit_file_list_free_onep) UnitFileList *f = NULL;
2190                         struct dirent *de;
2191                         _cleanup_free_ char *path = NULL;
2192
2193                         errno = 0;
2194                         de = readdir(d);
2195                         if (!de && errno != 0)
2196                                 return -errno;
2197
2198                         if (!de)
2199                                 break;
2200
2201                         if (ignore_file(de->d_name))
2202                                 continue;
2203
2204                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2205                                 continue;
2206
2207                         if (hashmap_get(h, de->d_name))
2208                                 continue;
2209
2210                         dirent_ensure_type(d, de);
2211
2212                         if (!IN_SET(de->d_type, DT_LNK, DT_REG))
2213                                 continue;
2214
2215                         f = new0(UnitFileList, 1);
2216                         if (!f)
2217                                 return -ENOMEM;
2218
2219                         f->path = path_make_absolute(de->d_name, units_dir);
2220                         if (!f->path)
2221                                 return -ENOMEM;
2222
2223                         r = null_or_empty_path(f->path);
2224                         if (r < 0 && r != -ENOENT)
2225                                 return r;
2226                         else if (r > 0) {
2227                                 f->state =
2228                                         path_startswith(*i, "/run") ?
2229                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
2230                                 goto found;
2231                         }
2232
2233                         r = find_symlinks_in_scope(scope, root_dir, de->d_name, &f->state);
2234                         if (r < 0)
2235                                 return r;
2236                         else if (r > 0) {
2237                                 f->state = UNIT_FILE_ENABLED;
2238                                 goto found;
2239                         }
2240
2241                         path = path_make_absolute(de->d_name, *i);
2242                         if (!path)
2243                                 return -ENOMEM;
2244
2245                         r = unit_file_can_install(&paths, root_dir, path, true);
2246                         if (r == -EINVAL ||  /* Invalid setting? */
2247                             r == -EBADMSG || /* Invalid format? */
2248                             r == -ENOENT     /* Included file not found? */)
2249                                 f->state = UNIT_FILE_INVALID;
2250                         else if (r < 0)
2251                                 return r;
2252                         else if (r > 0)
2253                                 f->state = UNIT_FILE_DISABLED;
2254                         else
2255                                 f->state = UNIT_FILE_STATIC;
2256
2257                 found:
2258                         r = hashmap_put(h, basename(f->path), f);
2259                         if (r < 0)
2260                                 return r;
2261                         f = NULL; /* prevent cleanup */
2262                 }
2263         }
2264
2265         return r;
2266 }
2267
2268 static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
2269         [UNIT_FILE_ENABLED] = "enabled",
2270         [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtime",
2271         [UNIT_FILE_LINKED] = "linked",
2272         [UNIT_FILE_LINKED_RUNTIME] = "linked-runtime",
2273         [UNIT_FILE_MASKED] = "masked",
2274         [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
2275         [UNIT_FILE_STATIC] = "static",
2276         [UNIT_FILE_DISABLED] = "disabled",
2277         [UNIT_FILE_INVALID] = "invalid",
2278 };
2279
2280 DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
2281
2282 static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
2283         [UNIT_FILE_SYMLINK] = "symlink",
2284         [UNIT_FILE_UNLINK] = "unlink",
2285 };
2286
2287 DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
2288
2289 static const char* const unit_file_preset_mode_table[_UNIT_FILE_PRESET_MAX] = {
2290         [UNIT_FILE_PRESET_FULL] = "full",
2291         [UNIT_FILE_PRESET_ENABLE_ONLY] = "enable-only",
2292         [UNIT_FILE_PRESET_DISABLE_ONLY] = "disable-only",
2293 };
2294
2295 DEFINE_STRING_TABLE_LOOKUP(unit_file_preset_mode, UnitFilePresetMode);