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