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 = 0, q;
1399
1400         assert(c);
1401         assert(paths);
1402         assert(config_path);
1403
1404         while ((i = ordered_hashmap_first(c->will_install))) {
1405
1406                 q = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1407                 if (q < 0)
1408                         return q;
1409
1410                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1411
1412                 q = unit_file_search(c, i, paths, root_dir, false, true);
1413                 if (q < 0) {
1414                         if (r >= 0)
1415                                 r = q;
1416
1417                         return r;
1418                 } else if (r >= 0)
1419                         r += q;
1420
1421                 q = install_info_apply(i, paths, config_path, root_dir, force, changes, n_changes);
1422                 if (r >= 0 && q < 0)
1423                         r = q;
1424         }
1425
1426         return r;
1427 }
1428
1429 static int install_context_mark_for_removal(
1430                 InstallContext *c,
1431                 LookupPaths *paths,
1432                 Set **remove_symlinks_to,
1433                 const char *config_path,
1434                 const char *root_dir) {
1435
1436         InstallInfo *i;
1437         int r = 0, q;
1438
1439         assert(c);
1440         assert(paths);
1441         assert(config_path);
1442
1443         /* Marks all items for removal */
1444
1445         while ((i = ordered_hashmap_first(c->will_install))) {
1446
1447                 q = ordered_hashmap_ensure_allocated(&c->have_installed, &string_hash_ops);
1448                 if (q < 0)
1449                         return q;
1450
1451                 assert_se(ordered_hashmap_move_one(c->have_installed, c->will_install, i->name) == 0);
1452
1453                 q = unit_file_search(c, i, paths, root_dir, false, true);
1454                 if (q == -ENOENT) {
1455                         /* do nothing */
1456                 } else if (q < 0) {
1457                         if (r >= 0)
1458                                 r = q;
1459
1460                         return r;
1461                 } else if (r >= 0)
1462                         r += q;
1463
1464                 if (unit_name_is_instance(i->name)) {
1465                         char *unit_file;
1466
1467                         if (i->path) {
1468                                 unit_file = basename(i->path);
1469
1470                                 if (unit_name_is_instance(unit_file))
1471                                         /* unit file named as instance exists, thus all symlinks
1472                                          * pointing to it will be removed */
1473                                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1474                                 else
1475                                         /* does not exist, thus we will mark for removal symlinks
1476                                          * to template unit file */
1477                                         q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1478                         } else {
1479                                 /* If i->path is not set, it means that we didn't actually find
1480                                  * the unit file. But we can still remove symlinks to the
1481                                  * nonexistent template. */
1482                                 unit_file = unit_name_template(i->name);
1483                                 if (!unit_file)
1484                                         return log_oom();
1485
1486                                 q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
1487                                 free(unit_file);
1488                         }
1489                 } else
1490                         q = mark_symlink_for_removal(remove_symlinks_to, i->name);
1491
1492                 if (r >= 0 && q < 0)
1493                         r = q;
1494         }
1495
1496         return r;
1497 }
1498
1499 int unit_file_add_dependency(
1500                 UnitFileScope scope,
1501                 bool runtime,
1502                 const char *root_dir,
1503                 char **files,
1504                 char *target,
1505                 UnitDependency dep,
1506                 bool force,
1507                 UnitFileChange **changes,
1508                 unsigned *n_changes) {
1509
1510         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1511         _cleanup_(install_context_done) InstallContext c = {};
1512         _cleanup_free_ char *config_path = NULL;
1513         char **i;
1514         int r;
1515         InstallInfo *info;
1516
1517         assert(scope >= 0);
1518         assert(scope < _UNIT_FILE_SCOPE_MAX);
1519
1520         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1521         if (r < 0)
1522                 return r;
1523
1524         r = get_config_path(scope, runtime, root_dir, &config_path);
1525         if (r < 0)
1526                 return r;
1527
1528         STRV_FOREACH(i, files) {
1529                 UnitFileState state;
1530
1531                 state = unit_file_get_state(scope, root_dir, *i);
1532                 if (state < 0) {
1533                         log_error("Failed to get unit file state for %s: %s", *i, strerror(-state));
1534                         return state;
1535                 }
1536
1537                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1538                         log_error("Failed to enable unit: Unit %s is masked", *i);
1539                         return -ENOTSUP;
1540                 }
1541
1542                 r = install_info_add_auto(&c, *i);
1543                 if (r < 0)
1544                         return r;
1545         }
1546
1547         while ((info = ordered_hashmap_first(c.will_install))) {
1548                 r = ordered_hashmap_ensure_allocated(&c.have_installed, &string_hash_ops);
1549                 if (r < 0)
1550                         return r;
1551
1552                 assert_se(ordered_hashmap_move_one(c.have_installed, c.will_install, info->name) == 0);
1553
1554                 r = unit_file_search(&c, info, &paths, root_dir, false, false);
1555                 if (r < 0)
1556                         return r;
1557
1558                 if (dep == UNIT_WANTS)
1559                         r = strv_extend(&info->wanted_by, target);
1560                 else if (dep == UNIT_REQUIRES)
1561                         r = strv_extend(&info->required_by, target);
1562                 else
1563                         r = -EINVAL;
1564
1565                 if (r < 0)
1566                         return r;
1567
1568                 r = install_info_apply(info, &paths, config_path, root_dir, force, changes, n_changes);
1569                 if (r < 0)
1570                         return r;
1571         }
1572
1573         return 0;
1574 }
1575
1576 int unit_file_enable(
1577                 UnitFileScope scope,
1578                 bool runtime,
1579                 const char *root_dir,
1580                 char **files,
1581                 bool force,
1582                 UnitFileChange **changes,
1583                 unsigned *n_changes) {
1584
1585         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1586         _cleanup_(install_context_done) InstallContext c = {};
1587         char **i;
1588         _cleanup_free_ char *config_path = NULL;
1589         int r;
1590
1591         assert(scope >= 0);
1592         assert(scope < _UNIT_FILE_SCOPE_MAX);
1593
1594         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1595         if (r < 0)
1596                 return r;
1597
1598         r = get_config_path(scope, runtime, root_dir, &config_path);
1599         if (r < 0)
1600                 return r;
1601
1602         STRV_FOREACH(i, files) {
1603                 UnitFileState state;
1604
1605                 state = unit_file_get_state(scope, root_dir, *i);
1606                 if (state < 0) {
1607                         log_error("Failed to get unit file state for %s: %s", *i, strerror(-state));
1608                         return state;
1609                 }
1610
1611                 if (state == UNIT_FILE_MASKED || state == UNIT_FILE_MASKED_RUNTIME) {
1612                         log_error("Failed to enable unit: Unit %s is masked", *i);
1613                         return -ENOTSUP;
1614                 }
1615
1616                 r = install_info_add_auto(&c, *i);
1617                 if (r < 0)
1618                         return r;
1619         }
1620
1621         /* This will return the number of symlink rules that were
1622         supposed to be created, not the ones actually created. This is
1623         useful to determine whether the passed files had any
1624         installation data at all. */
1625
1626         return install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
1627 }
1628
1629 int unit_file_disable(
1630                 UnitFileScope scope,
1631                 bool runtime,
1632                 const char *root_dir,
1633                 char **files,
1634                 UnitFileChange **changes,
1635                 unsigned *n_changes) {
1636
1637         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1638         _cleanup_(install_context_done) InstallContext c = {};
1639         char **i;
1640         _cleanup_free_ char *config_path = NULL;
1641         _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
1642         int r, q;
1643
1644         assert(scope >= 0);
1645         assert(scope < _UNIT_FILE_SCOPE_MAX);
1646
1647         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1648         if (r < 0)
1649                 return r;
1650
1651         r = get_config_path(scope, runtime, root_dir, &config_path);
1652         if (r < 0)
1653                 return r;
1654
1655         STRV_FOREACH(i, files) {
1656                 r = install_info_add_auto(&c, *i);
1657                 if (r < 0)
1658                         return r;
1659         }
1660
1661         r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
1662
1663         q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
1664         if (r == 0)
1665                 r = q;
1666
1667         return r;
1668 }
1669
1670 int unit_file_reenable(
1671                 UnitFileScope scope,
1672                 bool runtime,
1673                 const char *root_dir,
1674                 char **files,
1675                 bool force,
1676                 UnitFileChange **changes,
1677                 unsigned *n_changes) {
1678         int r;
1679
1680         r = unit_file_disable(scope, runtime, root_dir, files,
1681                               changes, n_changes);
1682         if (r < 0)
1683                 return r;
1684
1685         return unit_file_enable(scope, runtime, root_dir, files, force,
1686                                 changes, n_changes);
1687 }
1688
1689 int unit_file_set_default(
1690                 UnitFileScope scope,
1691                 const char *root_dir,
1692                 const char *file,
1693                 bool force,
1694                 UnitFileChange **changes,
1695                 unsigned *n_changes) {
1696
1697         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1698         _cleanup_(install_context_done) InstallContext c = {};
1699         _cleanup_free_ char *config_path = NULL;
1700         char *path;
1701         int r;
1702         InstallInfo *i = NULL;
1703
1704         assert(scope >= 0);
1705         assert(scope < _UNIT_FILE_SCOPE_MAX);
1706         assert(file);
1707
1708         if (unit_name_to_type(file) != UNIT_TARGET)
1709                 return -EINVAL;
1710
1711         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1712         if (r < 0)
1713                 return r;
1714
1715         r = get_config_path(scope, false, root_dir, &config_path);
1716         if (r < 0)
1717                 return r;
1718
1719         r = install_info_add_auto(&c, file);
1720         if (r < 0)
1721                 return r;
1722
1723         assert_se(i = ordered_hashmap_first(c.will_install));
1724
1725         r = unit_file_search(&c, i, &paths, root_dir, false, true);
1726         if (r < 0)
1727                 return r;
1728
1729         path = strappenda(config_path, "/" SPECIAL_DEFAULT_TARGET);
1730
1731         r = create_symlink(i->path, path, force, changes, n_changes);
1732         if (r < 0)
1733                 return r;
1734
1735         return 0;
1736 }
1737
1738 int unit_file_get_default(
1739                 UnitFileScope scope,
1740                 const char *root_dir,
1741                 char **name) {
1742
1743         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1744         char **p;
1745         int r;
1746
1747         assert(scope >= 0);
1748         assert(scope < _UNIT_FILE_SCOPE_MAX);
1749         assert(name);
1750
1751         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1752         if (r < 0)
1753                 return r;
1754
1755         STRV_FOREACH(p, paths.unit_path) {
1756                 _cleanup_free_ char *path = NULL, *tmp = NULL;
1757                 char *n;
1758
1759                 path = path_join(root_dir, *p, SPECIAL_DEFAULT_TARGET);
1760                 if (!path)
1761                         return -ENOMEM;
1762
1763                 r = readlink_malloc(path, &tmp);
1764                 if (r == -ENOENT)
1765                         continue;
1766                 else if (r == -EINVAL)
1767                         /* not a symlink */
1768                         n = strdup(SPECIAL_DEFAULT_TARGET);
1769                 else if (r < 0)
1770                         return r;
1771                 else
1772                         n = strdup(basename(tmp));
1773
1774                 if (!n)
1775                         return -ENOMEM;
1776
1777                 *name = n;
1778                 return 0;
1779         }
1780
1781         return -ENOENT;
1782 }
1783
1784 UnitFileState unit_file_get_state(
1785                 UnitFileScope scope,
1786                 const char *root_dir,
1787                 const char *name) {
1788
1789         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1790         UnitFileState state = _UNIT_FILE_STATE_INVALID;
1791         char **i;
1792         _cleanup_free_ char *path = NULL;
1793         int r;
1794
1795         assert(scope >= 0);
1796         assert(scope < _UNIT_FILE_SCOPE_MAX);
1797         assert(name);
1798
1799         if (root_dir && scope != UNIT_FILE_SYSTEM)
1800                 return -EINVAL;
1801
1802         if (!unit_name_is_valid(name, TEMPLATE_VALID))
1803                 return -EINVAL;
1804
1805         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1806         if (r < 0)
1807                 return r;
1808
1809         STRV_FOREACH(i, paths.unit_path) {
1810                 struct stat st;
1811                 char *partial;
1812
1813                 free(path);
1814                 path = NULL;
1815
1816                 path = path_join(root_dir, *i, name);
1817                 if (!path)
1818                         return -ENOMEM;
1819
1820                 if (root_dir)
1821                         partial = path + strlen(root_dir);
1822                 else
1823                         partial = path;
1824
1825                 /*
1826                  * Search for a unit file in our default paths, to
1827                  * be sure, that there are no broken symlinks.
1828                  */
1829                 if (lstat(path, &st) < 0) {
1830                         r = -errno;
1831                         if (errno != ENOENT)
1832                                 return r;
1833
1834                         if (!unit_name_is_instance(name))
1835                                 continue;
1836                 } else {
1837                         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
1838                                 return -ENOENT;
1839
1840                         r = null_or_empty_path(path);
1841                         if (r < 0 && r != -ENOENT)
1842                                 return r;
1843                         else if (r > 0) {
1844                                 state = path_startswith(*i, "/run") ?
1845                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
1846                                 return state;
1847                         }
1848                 }
1849
1850                 r = find_symlinks_in_scope(scope, root_dir, name, &state);
1851                 if (r < 0)
1852                         return r;
1853                 else if (r > 0)
1854                         return state;
1855
1856                 r = unit_file_can_install(&paths, root_dir, partial, true);
1857                 if (r < 0 && errno != ENOENT)
1858                         return r;
1859                 else if (r > 0)
1860                         return UNIT_FILE_DISABLED;
1861                 else if (r == 0)
1862                         return UNIT_FILE_STATIC;
1863         }
1864
1865         return r < 0 ? r : state;
1866 }
1867
1868 int unit_file_query_preset(UnitFileScope scope, const char *root_dir, const char *name) {
1869         _cleanup_strv_free_ char **files = NULL;
1870         char **p;
1871         int r;
1872
1873         assert(scope >= 0);
1874         assert(scope < _UNIT_FILE_SCOPE_MAX);
1875         assert(name);
1876
1877         if (scope == UNIT_FILE_SYSTEM)
1878                 r = conf_files_list(&files, ".preset", root_dir,
1879                                     "/etc/systemd/system-preset",
1880                                     "/usr/local/lib/systemd/system-preset",
1881                                     "/usr/lib/systemd/system-preset",
1882 #ifdef HAVE_SPLIT_USR
1883                                     "/lib/systemd/system-preset",
1884 #endif
1885                                     NULL);
1886         else if (scope == UNIT_FILE_GLOBAL)
1887                 r = conf_files_list(&files, ".preset", root_dir,
1888                                     "/etc/systemd/user-preset",
1889                                     "/usr/local/lib/systemd/user-preset",
1890                                     "/usr/lib/systemd/user-preset",
1891                                     NULL);
1892         else
1893                 return 1;
1894
1895         if (r < 0)
1896                 return r;
1897
1898         STRV_FOREACH(p, files) {
1899                 _cleanup_fclose_ FILE *f;
1900
1901                 f = fopen(*p, "re");
1902                 if (!f) {
1903                         if (errno == ENOENT)
1904                                 continue;
1905
1906                         return -errno;
1907                 }
1908
1909                 for (;;) {
1910                         char line[LINE_MAX], *l;
1911
1912                         if (!fgets(line, sizeof(line), f))
1913                                 break;
1914
1915                         l = strstrip(line);
1916                         if (!*l)
1917                                 continue;
1918
1919                         if (strchr(COMMENTS "\n", *l))
1920                                 continue;
1921
1922                         if (first_word(l, "enable")) {
1923                                 l += 6;
1924                                 l += strspn(l, WHITESPACE);
1925
1926                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1927                                         log_debug("Preset file says enable %s.", name);
1928                                         return 1;
1929                                 }
1930
1931                         } else if (first_word(l, "disable")) {
1932                                 l += 7;
1933                                 l += strspn(l, WHITESPACE);
1934
1935                                 if (fnmatch(l, name, FNM_NOESCAPE) == 0) {
1936                                         log_debug("Preset file says disable %s.", name);
1937                                         return 0;
1938                                 }
1939
1940                         } else
1941                                 log_debug("Couldn't parse line '%s'", l);
1942                 }
1943         }
1944
1945         /* Default is "enable" */
1946         log_debug("Preset file doesn't say anything about %s, enabling.", name);
1947         return 1;
1948 }
1949
1950 int unit_file_preset(
1951                 UnitFileScope scope,
1952                 bool runtime,
1953                 const char *root_dir,
1954                 char **files,
1955                 UnitFilePresetMode mode,
1956                 bool force,
1957                 UnitFileChange **changes,
1958                 unsigned *n_changes) {
1959
1960         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
1961         _cleanup_lookup_paths_free_ LookupPaths paths = {};
1962         _cleanup_free_ char *config_path = NULL;
1963         char **i;
1964         int r, q;
1965
1966         assert(scope >= 0);
1967         assert(scope < _UNIT_FILE_SCOPE_MAX);
1968         assert(mode < _UNIT_FILE_PRESET_MAX);
1969
1970         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
1971         if (r < 0)
1972                 return r;
1973
1974         r = get_config_path(scope, runtime, root_dir, &config_path);
1975         if (r < 0)
1976                 return r;
1977
1978         STRV_FOREACH(i, files) {
1979
1980                 if (!unit_name_is_valid(*i, TEMPLATE_VALID))
1981                         return -EINVAL;
1982
1983                 r = unit_file_query_preset(scope, root_dir, *i);
1984                 if (r < 0)
1985                         return r;
1986
1987                 if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
1988                         r = install_info_add_auto(&plus, *i);
1989                 else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
1990                         r = install_info_add_auto(&minus, *i);
1991                 else
1992                         r = 0;
1993                 if (r < 0)
1994                         return r;
1995         }
1996
1997         r = 0;
1998
1999         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2000                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2001
2002                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2003
2004                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
2005                 if (r == 0)
2006                         r = q;
2007         }
2008
2009         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2010                 /* Returns number of symlinks that where supposed to be installed. */
2011                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2012                 if (r == 0)
2013                         r = q;
2014         }
2015
2016         return r;
2017 }
2018
2019 int unit_file_preset_all(
2020                 UnitFileScope scope,
2021                 bool runtime,
2022                 const char *root_dir,
2023                 UnitFilePresetMode mode,
2024                 bool force,
2025                 UnitFileChange **changes,
2026                 unsigned *n_changes) {
2027
2028         _cleanup_(install_context_done) InstallContext plus = {}, minus = {};
2029         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2030         _cleanup_free_ char *config_path = NULL;
2031         char **i;
2032         int r, q;
2033
2034         assert(scope >= 0);
2035         assert(scope < _UNIT_FILE_SCOPE_MAX);
2036         assert(mode < _UNIT_FILE_PRESET_MAX);
2037
2038         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2039         if (r < 0)
2040                 return r;
2041
2042         r = get_config_path(scope, runtime, root_dir, &config_path);
2043         if (r < 0)
2044                 return r;
2045
2046         STRV_FOREACH(i, paths.unit_path) {
2047                 _cleanup_closedir_ DIR *d = NULL;
2048                 _cleanup_free_ char *units_dir;
2049
2050                 units_dir = path_join(root_dir, *i, NULL);
2051                 if (!units_dir)
2052                         return -ENOMEM;
2053
2054                 d = opendir(units_dir);
2055                 if (!d) {
2056                         if (errno == ENOENT)
2057                                 continue;
2058
2059                         return -errno;
2060                 }
2061
2062                 for (;;) {
2063                         struct dirent *de;
2064
2065                         errno = 0;
2066                         de = readdir(d);
2067                         if (!de && errno != 0)
2068                                 return -errno;
2069
2070                         if (!de)
2071                                 break;
2072
2073                         if (ignore_file(de->d_name))
2074                                 continue;
2075
2076                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2077                                 continue;
2078
2079                         dirent_ensure_type(d, de);
2080
2081                         if (de->d_type != DT_REG)
2082                                 continue;
2083
2084                         r = unit_file_query_preset(scope, root_dir, de->d_name);
2085                         if (r < 0)
2086                                 return r;
2087
2088                         if (r && mode != UNIT_FILE_PRESET_DISABLE_ONLY)
2089                                 r = install_info_add_auto(&plus, de->d_name);
2090                         else if (!r && mode != UNIT_FILE_PRESET_ENABLE_ONLY)
2091                                 r = install_info_add_auto(&minus, de->d_name);
2092                         else
2093                                 r = 0;
2094                         if (r < 0)
2095                                 return r;
2096                 }
2097         }
2098
2099         r = 0;
2100
2101         if (mode != UNIT_FILE_PRESET_ENABLE_ONLY) {
2102                 _cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
2103
2104                 r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
2105
2106                 q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, NULL);
2107                 if (r == 0)
2108                         r = q;
2109         }
2110
2111         if (mode != UNIT_FILE_PRESET_DISABLE_ONLY) {
2112                 q = install_context_apply(&plus, &paths, config_path, root_dir, force, changes, n_changes);
2113                 if (r == 0)
2114                         r = q;
2115         }
2116
2117         return r;
2118 }
2119
2120 static void unit_file_list_free_one(UnitFileList *f) {
2121         if (!f)
2122                 return;
2123
2124         free(f->path);
2125         free(f);
2126 }
2127
2128 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
2129
2130 int unit_file_get_list(
2131                 UnitFileScope scope,
2132                 const char *root_dir,
2133                 Hashmap *h) {
2134
2135         _cleanup_lookup_paths_free_ LookupPaths paths = {};
2136         char **i;
2137         int r;
2138
2139         assert(scope >= 0);
2140         assert(scope < _UNIT_FILE_SCOPE_MAX);
2141         assert(h);
2142
2143         if (root_dir && scope != UNIT_FILE_SYSTEM)
2144                 return -EINVAL;
2145
2146         if (root_dir) {
2147                 r = access(root_dir, F_OK);
2148                 if (r < 0)
2149                         return -errno;
2150         }
2151
2152         r = lookup_paths_init_from_scope(&paths, scope, root_dir);
2153         if (r < 0)
2154                 return r;
2155
2156         STRV_FOREACH(i, paths.unit_path) {
2157                 _cleanup_closedir_ DIR *d = NULL;
2158                 _cleanup_free_ char *units_dir;
2159
2160                 units_dir = path_join(root_dir, *i, NULL);
2161                 if (!units_dir)
2162                         return -ENOMEM;
2163
2164                 d = opendir(units_dir);
2165                 if (!d) {
2166                         if (errno == ENOENT)
2167                                 continue;
2168
2169                         return -errno;
2170                 }
2171
2172                 for (;;) {
2173                         _cleanup_(unit_file_list_free_onep) UnitFileList *f = NULL;
2174                         struct dirent *de;
2175                         _cleanup_free_ char *path = NULL;
2176
2177                         errno = 0;
2178                         de = readdir(d);
2179                         if (!de && errno != 0)
2180                                 return -errno;
2181
2182                         if (!de)
2183                                 break;
2184
2185                         if (ignore_file(de->d_name))
2186                                 continue;
2187
2188                         if (!unit_name_is_valid(de->d_name, TEMPLATE_VALID))
2189                                 continue;
2190
2191                         if (hashmap_get(h, de->d_name))
2192                                 continue;
2193
2194                         dirent_ensure_type(d, de);
2195
2196                         if (!IN_SET(de->d_type, DT_LNK, DT_REG))
2197                                 continue;
2198
2199                         f = new0(UnitFileList, 1);
2200                         if (!f)
2201                                 return -ENOMEM;
2202
2203                         f->path = path_make_absolute(de->d_name, units_dir);
2204                         if (!f->path)
2205                                 return -ENOMEM;
2206
2207                         r = null_or_empty_path(f->path);
2208                         if (r < 0 && r != -ENOENT)
2209                                 return r;
2210                         else if (r > 0) {
2211                                 f->state =
2212                                         path_startswith(*i, "/run") ?
2213                                         UNIT_FILE_MASKED_RUNTIME : UNIT_FILE_MASKED;
2214                                 goto found;
2215                         }
2216
2217                         r = find_symlinks_in_scope(scope, root_dir, de->d_name, &f->state);
2218                         if (r < 0)
2219                                 return r;
2220                         else if (r > 0) {
2221                                 f->state = UNIT_FILE_ENABLED;
2222                                 goto found;
2223                         }
2224
2225                         path = path_make_absolute(de->d_name, *i);
2226                         if (!path)
2227                                 return -ENOMEM;
2228
2229                         r = unit_file_can_install(&paths, root_dir, path, true);
2230                         if (r == -EINVAL ||  /* Invalid setting? */
2231                             r == -EBADMSG || /* Invalid format? */
2232                             r == -ENOENT     /* Included file not found? */)
2233                                 f->state = UNIT_FILE_INVALID;
2234                         else if (r < 0)
2235                                 return r;
2236                         else if (r > 0)
2237                                 f->state = UNIT_FILE_DISABLED;
2238                         else
2239                                 f->state = UNIT_FILE_STATIC;
2240
2241                 found:
2242                         r = hashmap_put(h, basename(f->path), f);
2243                         if (r < 0)
2244                                 return r;
2245                         f = NULL; /* prevent cleanup */
2246                 }
2247         }
2248
2249         return r;
2250 }
2251
2252 static const char* const unit_file_state_table[_UNIT_FILE_STATE_MAX] = {
2253         [UNIT_FILE_ENABLED] = "enabled",
2254         [UNIT_FILE_ENABLED_RUNTIME] = "enabled-runtime",
2255         [UNIT_FILE_LINKED] = "linked",
2256         [UNIT_FILE_LINKED_RUNTIME] = "linked-runtime",
2257         [UNIT_FILE_MASKED] = "masked",
2258         [UNIT_FILE_MASKED_RUNTIME] = "masked-runtime",
2259         [UNIT_FILE_STATIC] = "static",
2260         [UNIT_FILE_DISABLED] = "disabled",
2261         [UNIT_FILE_INVALID] = "invalid",
2262 };
2263
2264 DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
2265
2266 static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
2267         [UNIT_FILE_SYMLINK] = "symlink",
2268         [UNIT_FILE_UNLINK] = "unlink",
2269 };
2270
2271 DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
2272
2273 static const char* const unit_file_preset_mode_table[_UNIT_FILE_PRESET_MAX] = {
2274         [UNIT_FILE_PRESET_FULL] = "full",
2275         [UNIT_FILE_PRESET_ENABLE_ONLY] = "enable-only",
2276         [UNIT_FILE_PRESET_DISABLE_ONLY] = "disable-only",
2277 };
2278
2279 DEFINE_STRING_TABLE_LOOKUP(unit_file_preset_mode, UnitFilePresetMode);