src/shared/path-lookup.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #include "alloc-util.h"
   9 #include "fs-util.h"
  10 #include "install.h"
  11 #include "log.h"
  12 #include "macro.h"
  13 #include "mkdir.h"
  14 #include "path-lookup.h"
  15 #include "path-util.h"
  16 #include "rm-rf.h"
  17 #include "stat-util.h"
  18 #include "string-util.h"
  19 #include "strv.h"
  20 #include "tmpfile-util.h"
  21 #include "user-util.h"
  22 #include "util.h"
  23
  24 int xdg_user_runtime_dir(char **ret, const char *suffix) {
  25         const char *e;
  26         char *j;
  27
  28         assert(ret);
  29         assert(suffix);
  30
  31         e = getenv("XDG_RUNTIME_DIR");
  32         if (!e)
  33                 return -ENXIO;
  34
  35         j = strappend(e, suffix);
  36         if (!j)
  37                 return -ENOMEM;
  38
  39         *ret = j;
  40         return 0;
  41 }
  42
  43 int xdg_user_config_dir(char **ret, const char *suffix) {
  44         const char *e;
  45         char *j;
  46         int r;
  47
  48         assert(ret);
  49
  50         e = getenv("XDG_CONFIG_HOME");
  51         if (e)
  52                 j = strappend(e, suffix);
  53         else {
  54                 _cleanup_free_ char *home = NULL;
  55
  56                 r = get_home_dir(&home);
  57                 if (r < 0)
  58                         return r;
  59
  60                 j = strjoin(home, "/.config", suffix);
  61         }
  62
  63         if (!j)
  64                 return -ENOMEM;
  65
  66         *ret = j;
  67         return 0;
  68 }
  69
  70 int xdg_user_data_dir(char **ret, const char *suffix) {
  71         const char *e;
  72         char *j;
  73         int r;
  74
  75         assert(ret);
  76         assert(suffix);
  77
  78         /* We don't treat /etc/xdg/systemd here as the spec
  79          * suggests because we assume that is a link to
  80          * /etc/systemd/ anyway. */
  81
  82         e = getenv("XDG_DATA_HOME");
  83         if (e)
  84                 j = strappend(e, suffix);
  85         else {
  86                 _cleanup_free_ char *home = NULL;
  87
  88                 r = get_home_dir(&home);
  89                 if (r < 0)
  90                         return r;
  91
  92                 j = strjoin(home, "/.local/share", suffix);
  93         }
  94         if (!j)
  95                 return -ENOMEM;
  96
  97         *ret = j;
  98         return 1;
  99 }
 100
 101 static const char* const user_data_unit_paths[] = {
 102         "/usr/local/lib/systemd/user",
 103         "/usr/local/share/systemd/user",
 104         USER_DATA_UNIT_PATH,
 105         "/usr/lib/systemd/user",
 106         "/usr/share/systemd/user",
 107         NULL
 108 };
 109
 110 static const char* const user_config_unit_paths[] = {
 111         USER_CONFIG_UNIT_PATH,
 112         "/etc/systemd/user",
 113         NULL
 114 };
 115
 116 int xdg_user_dirs(char ***ret_config_dirs, char ***ret_data_dirs) {
 117         /* Implement the mechanisms defined in
 118          *
 119          * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
 120          *
 121          * We look in both the config and the data dirs because we
 122          * want to encourage that distributors ship their unit files
 123          * as data, and allow overriding as configuration.
 124          */
 125         const char *e;
 126         _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
 127
 128         e = getenv("XDG_CONFIG_DIRS");
 129         if (e) {
 130                 config_dirs = strv_split(e, ":");
 131                 if (!config_dirs)
 132                         return -ENOMEM;
 133         }
 134
 135         e = getenv("XDG_DATA_DIRS");
 136         if (e)
 137                 data_dirs = strv_split(e, ":");
 138         else
 139                 data_dirs = strv_new("/usr/local/share",
 140                                      "/usr/share");
 141         if (!data_dirs)
 142                 return -ENOMEM;
 143
 144         *ret_config_dirs = TAKE_PTR(config_dirs);
 145         *ret_data_dirs = TAKE_PTR(data_dirs);
 146
 147         return 0;
 148 }
 149
 150 static char** user_dirs(
 151                 const char *persistent_config,
 152                 const char *runtime_config,
 153                 const char *global_persistent_config,
 154                 const char *global_runtime_config,
 155                 const char *generator,
 156                 const char *generator_early,
 157                 const char *generator_late,
 158                 const char *transient,
 159                 const char *persistent_control,
 160                 const char *runtime_control) {
 161
 162         _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
 163         _cleanup_free_ char *data_home = NULL;
 164         _cleanup_strv_free_ char **res = NULL;
 165         int r;
 166
 167         r = xdg_user_dirs(&config_dirs, &data_dirs);
 168         if (r < 0)
 169                 return NULL;
 170
 171         r = xdg_user_data_dir(&data_home, "/systemd/user");
 172         if (r < 0 && r != -ENXIO)
 173                 return NULL;
 174
 175         /* Now merge everything we found. */
 176         if (strv_extend(&res, persistent_control) < 0)
 177                 return NULL;
 178
 179         if (strv_extend(&res, runtime_control) < 0)
 180                 return NULL;
 181
 182         if (strv_extend(&res, transient) < 0)
 183                 return NULL;
 184
 185         if (strv_extend(&res, generator_early) < 0)
 186                 return NULL;
 187
 188         if (strv_extend_strv_concat(&res, config_dirs, "/systemd/user") < 0)
 189                 return NULL;
 190
 191         if (strv_extend(&res, persistent_config) < 0)
 192                 return NULL;
 193
 194         /* global config has lower priority than the user config of the same type */
 195         if (strv_extend(&res, global_persistent_config) < 0)
 196                 return NULL;
 197
 198         if (strv_extend_strv(&res, (char**) user_config_unit_paths, false) < 0)
 199                 return NULL;
 200
 201         if (strv_extend(&res, runtime_config) < 0)
 202                 return NULL;
 203
 204         if (strv_extend(&res, global_runtime_config) < 0)
 205                 return NULL;
 206
 207         if (strv_extend(&res, generator) < 0)
 208                 return NULL;
 209
 210         if (strv_extend(&res, data_home) < 0)
 211                 return NULL;
 212
 213         if (strv_extend_strv_concat(&res, data_dirs, "/systemd/user") < 0)
 214                 return NULL;
 215
 216         if (strv_extend_strv(&res, (char**) user_data_unit_paths, false) < 0)
 217                 return NULL;
 218
 219         if (strv_extend(&res, generator_late) < 0)
 220                 return NULL;
 221
 222         if (path_strv_make_absolute_cwd(res) < 0)
 223                 return NULL;
 224
 225         return TAKE_PTR(res);
 226 }
 227
 228 bool path_is_user_data_dir(const char *path) {
 229         assert(path);
 230
 231         return strv_contains((char**) user_data_unit_paths, path);
 232 }
 233
 234 bool path_is_user_config_dir(const char *path) {
 235         assert(path);
 236
 237         return strv_contains((char**) user_config_unit_paths, path);
 238 }
 239
 240 static int acquire_generator_dirs(
 241                 UnitFileScope scope,
 242                 const char *tempdir,
 243                 char **generator,
 244                 char **generator_early,
 245                 char **generator_late) {
 246
 247         _cleanup_free_ char *x = NULL, *y = NULL, *z = NULL;
 248         const char *prefix;
 249
 250         assert(generator);
 251         assert(generator_early);
 252         assert(generator_late);
 253         assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER, UNIT_FILE_GLOBAL));
 254
 255         if (scope == UNIT_FILE_GLOBAL)
 256                 return -EOPNOTSUPP;
 257
 258         if (tempdir)
 259                 prefix = tempdir;
 260         else if (scope == UNIT_FILE_SYSTEM)
 261                 prefix = "/run/systemd";
 262         else {
 263                 /* UNIT_FILE_USER */
 264                 const char *e;
 265
 266                 e = getenv("XDG_RUNTIME_DIR");
 267                 if (!e)
 268                         return -ENXIO;
 269
 270                 prefix = strjoina(e, "/systemd");
 271         }
 272
 273         x = strappend(prefix, "/generator");
 274         if (!x)
 275                 return -ENOMEM;
 276
 277         y = strappend(prefix, "/generator.early");
 278         if (!y)
 279                 return -ENOMEM;
 280
 281         z = strappend(prefix, "/generator.late");
 282         if (!z)
 283                 return -ENOMEM;
 284
 285         *generator = TAKE_PTR(x);
 286         *generator_early = TAKE_PTR(y);
 287         *generator_late = TAKE_PTR(z);
 288
 289         return 0;
 290 }
 291
 292 static int acquire_transient_dir(
 293                 UnitFileScope scope,
 294                 const char *tempdir,
 295                 char **ret) {
 296
 297         char *transient;
 298
 299         assert(ret);
 300         assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER, UNIT_FILE_GLOBAL));
 301
 302         if (scope == UNIT_FILE_GLOBAL)
 303                 return -EOPNOTSUPP;
 304
 305         if (tempdir)
 306                 transient = path_join(tempdir, "transient");
 307         else if (scope == UNIT_FILE_SYSTEM)
 308                 transient = strdup("/run/systemd/transient");
 309         else
 310                 return xdg_user_runtime_dir(ret, "/systemd/transient");
 311
 312         if (!transient)
 313                 return -ENOMEM;
 314         *ret = transient;
 315         return 0;
 316 }
 317
 318 static int acquire_config_dirs(UnitFileScope scope, char **persistent, char **runtime) {
 319         _cleanup_free_ char *a = NULL, *b = NULL;
 320         int r;
 321
 322         assert(persistent);
 323         assert(runtime);
 324
 325         switch (scope) {
 326
 327         case UNIT_FILE_SYSTEM:
 328                 a = strdup(SYSTEM_CONFIG_UNIT_PATH);
 329                 b = strdup("/run/systemd/system");
 330                 break;
 331
 332         case UNIT_FILE_GLOBAL:
 333                 a = strdup(USER_CONFIG_UNIT_PATH);
 334                 b = strdup("/run/systemd/user");
 335                 break;
 336
 337         case UNIT_FILE_USER:
 338                 r = xdg_user_config_dir(&a, "/systemd/user");
 339                 if (r < 0 && r != -ENXIO)
 340                         return r;
 341
 342                 r = xdg_user_runtime_dir(runtime, "/systemd/user");
 343                 if (r < 0) {
 344                         if (r != -ENXIO)
 345                                 return r;
 346
 347                         /* If XDG_RUNTIME_DIR is not set, don't consider that fatal, simply initialize the runtime
 348                          * directory to NULL */
 349                         *runtime = NULL;
 350                 }
 351
 352                 *persistent = TAKE_PTR(a);
 353
 354                 return 0;
 355
 356         default:
 357                 assert_not_reached("Hmm, unexpected scope value.");
 358         }
 359
 360         if (!a || !b)
 361                 return -ENOMEM;
 362
 363         *persistent = TAKE_PTR(a);
 364         *runtime = TAKE_PTR(b);
 365
 366         return 0;
 367 }
 368
 369 static int acquire_control_dirs(UnitFileScope scope, char **persistent, char **runtime) {
 370         _cleanup_free_ char *a = NULL;
 371         int r;
 372
 373         assert(persistent);
 374         assert(runtime);
 375
 376         switch (scope) {
 377
 378         case UNIT_FILE_SYSTEM:  {
 379                 _cleanup_free_ char *b = NULL;
 380
 381                 a = strdup("/etc/systemd/system.control");
 382                 if (!a)
 383                         return -ENOMEM;
 384
 385                 b = strdup("/run/systemd/system.control");
 386                 if (!b)
 387                         return -ENOMEM;
 388
 389                 *runtime = TAKE_PTR(b);
 390
 391                 break;
 392         }
 393
 394         case UNIT_FILE_USER:
 395                 r = xdg_user_config_dir(&a, "/systemd/user.control");
 396                 if (r < 0 && r != -ENXIO)
 397                         return r;
 398
 399                 r = xdg_user_runtime_dir(runtime, "/systemd/user.control");
 400                 if (r < 0) {
 401                         if (r != -ENXIO)
 402                                 return r;
 403
 404                         /* If XDG_RUNTIME_DIR is not set, don't consider this fatal, simply initialize the directory to
 405                          * NULL */
 406                         *runtime = NULL;
 407                 }
 408
 409                 break;
 410
 411         case UNIT_FILE_GLOBAL:
 412                 return -EOPNOTSUPP;
 413
 414         default:
 415                 assert_not_reached("Hmm, unexpected scope value.");
 416         }
 417
 418         *persistent = TAKE_PTR(a);
 419
 420         return 0;
 421 }
 422
 423 static int acquire_attached_dirs(
 424                 UnitFileScope scope,
 425                 char **ret_persistent,
 426                 char **ret_runtime) {
 427
 428         _cleanup_free_ char *a = NULL, *b = NULL;
 429
 430         assert(ret_persistent);
 431         assert(ret_runtime);
 432
 433         /* Portable services are not available to regular users for now. */
 434         if (scope != UNIT_FILE_SYSTEM)
 435                 return -EOPNOTSUPP;
 436
 437         a = strdup("/etc/systemd/system.attached");
 438         if (!a)
 439                 return -ENOMEM;
 440
 441         b = strdup("/run/systemd/system.attached");
 442         if (!b)
 443                 return -ENOMEM;
 444
 445         *ret_persistent = TAKE_PTR(a);
 446         *ret_runtime = TAKE_PTR(b);
 447
 448         return 0;
 449 }
 450
 451 static int patch_root_prefix(char **p, const char *root_dir) {
 452         char *c;
 453
 454         assert(p);
 455
 456         if (!*p)
 457                 return 0;
 458
 459         c = prefix_root(root_dir, *p);
 460         if (!c)
 461                 return -ENOMEM;
 462
 463         free(*p);
 464         *p = c;
 465
 466         return 0;
 467 }
 468
 469 static int patch_root_prefix_strv(char **l, const char *root_dir) {
 470         char **i;
 471         int r;
 472
 473         if (!root_dir)
 474                 return 0;
 475
 476         STRV_FOREACH(i, l) {
 477                 r = patch_root_prefix(i, root_dir);
 478                 if (r < 0)
 479                         return r;
 480         }
 481
 482         return 0;
 483 }
 484
 485 int lookup_paths_init(
 486                 LookupPaths *p,
 487                 UnitFileScope scope,
 488                 LookupPathsFlags flags,
 489                 const char *root_dir) {
 490
 491         _cleanup_(rmdir_and_freep) char *tempdir = NULL;
 492         _cleanup_free_ char
 493                 *root = NULL,
 494                 *persistent_config = NULL, *runtime_config = NULL,
 495                 *global_persistent_config = NULL, *global_runtime_config = NULL,
 496                 *generator = NULL, *generator_early = NULL, *generator_late = NULL,
 497                 *transient = NULL,
 498                 *persistent_control = NULL, *runtime_control = NULL,
 499                 *persistent_attached = NULL, *runtime_attached = NULL;
 500         bool append = false; /* Add items from SYSTEMD_UNIT_PATH before normal directories */
 501         _cleanup_strv_free_ char **paths = NULL;
 502         const char *e;
 503         int r;
 504
 505         assert(p);
 506         assert(scope >= 0);
 507         assert(scope < _UNIT_FILE_SCOPE_MAX);
 508
 509 #if HAVE_SPLIT_USR
 510         flags |= LOOKUP_PATHS_SPLIT_USR;
 511 #endif
 512
 513         if (!empty_or_root(root_dir)) {
 514                 if (scope == UNIT_FILE_USER)
 515                         return -EINVAL;
 516
 517                 r = is_dir(root_dir, true);
 518                 if (r < 0)
 519                         return r;
 520                 if (r == 0)
 521                         return -ENOTDIR;
 522
 523                 root = strdup(root_dir);
 524                 if (!root)
 525                         return -ENOMEM;
 526         }
 527
 528         if (flags & LOOKUP_PATHS_TEMPORARY_GENERATED) {
 529                 r = mkdtemp_malloc("/tmp/systemd-temporary-XXXXXX", &tempdir);
 530                 if (r < 0)
 531                         return log_debug_errno(r, "Failed to create temporary directory: %m");
 532         }
 533
 534         /* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_config to NULL */
 535         r = acquire_config_dirs(scope, &persistent_config, &runtime_config);
 536         if (r < 0)
 537                 return r;
 538
 539         if (scope == UNIT_FILE_USER) {
 540                 r = acquire_config_dirs(UNIT_FILE_GLOBAL, &global_persistent_config, &global_runtime_config);
 541                 if (r < 0)
 542                         return r;
 543         }
 544
 545         if ((flags & LOOKUP_PATHS_EXCLUDE_GENERATED) == 0) {
 546                 /* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
 547                 r = acquire_generator_dirs(scope, tempdir,
 548                                            &generator, &generator_early, &generator_late);
 549                 if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENXIO))
 550                         return r;
 551         }
 552
 553         /* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
 554         r = acquire_transient_dir(scope, tempdir, &transient);
 555         if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENXIO))
 556                 return r;
 557
 558         /* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_control to NULL */
 559         r = acquire_control_dirs(scope, &persistent_control, &runtime_control);
 560         if (r < 0 && r != -EOPNOTSUPP)
 561                 return r;
 562
 563         r = acquire_attached_dirs(scope, &persistent_attached, &runtime_attached);
 564         if (r < 0 && r != -EOPNOTSUPP)
 565                 return r;
 566
 567         /* First priority is whatever has been passed to us via env vars */
 568         e = getenv("SYSTEMD_UNIT_PATH");
 569         if (e) {
 570                 const char *k;
 571
 572                 k = endswith(e, ":");
 573                 if (k) {
 574                         e = strndupa(e, k - e);
 575                         append = true;
 576                 }
 577
 578                 /* FIXME: empty components in other places should be rejected. */
 579
 580                 r = path_split_and_make_absolute(e, &paths);
 581                 if (r < 0)
 582                         return r;
 583         }
 584
 585         if (!paths || append) {
 586                 /* Let's figure something out. */
 587
 588                 _cleanup_strv_free_ char **add = NULL;
 589
 590                 /* For the user units we include share/ in the search
 591                  * path in order to comply with the XDG basedir spec.
 592                  * For the system stuff we avoid such nonsense. OTOH
 593                  * we include /lib in the search path for the system
 594                  * stuff but avoid it for user stuff. */
 595
 596                 switch (scope) {
 597
 598                 case UNIT_FILE_SYSTEM:
 599                         add = strv_new(
 600                                         /* If you modify this you also want to modify
 601                                          * systemdsystemunitpath= in systemd.pc.in! */
 602                                         STRV_IFNOTNULL(persistent_control),
 603                                         STRV_IFNOTNULL(runtime_control),
 604                                         STRV_IFNOTNULL(transient),
 605                                         STRV_IFNOTNULL(generator_early),
 606                                         persistent_config,
 607                                         SYSTEM_CONFIG_UNIT_PATH,
 608                                         "/etc/systemd/system",
 609                                         STRV_IFNOTNULL(persistent_attached),
 610                                         runtime_config,
 611                                         "/run/systemd/system",
 612                                         STRV_IFNOTNULL(runtime_attached),
 613                                         STRV_IFNOTNULL(generator),
 614                                         "/usr/local/lib/systemd/system",
 615                                         SYSTEM_DATA_UNIT_PATH,
 616                                         "/usr/lib/systemd/system",
 617                                         STRV_IFNOTNULL(flags & LOOKUP_PATHS_SPLIT_USR ? "/lib/systemd/system" : NULL),
 618                                         STRV_IFNOTNULL(generator_late));
 619                         break;
 620
 621                 case UNIT_FILE_GLOBAL:
 622                         add = strv_new(
 623                                         /* If you modify this you also want to modify
 624                                          * systemduserunitpath= in systemd.pc.in, and
 625                                          * the arrays in user_dirs() above! */
 626                                         STRV_IFNOTNULL(persistent_control),
 627                                         STRV_IFNOTNULL(runtime_control),
 628                                         STRV_IFNOTNULL(transient),
 629                                         STRV_IFNOTNULL(generator_early),
 630                                         persistent_config,
 631                                         USER_CONFIG_UNIT_PATH,
 632                                         "/etc/systemd/user",
 633                                         runtime_config,
 634                                         "/run/systemd/user",
 635                                         STRV_IFNOTNULL(generator),
 636                                         "/usr/local/share/systemd/user",
 637                                         "/usr/share/systemd/user",
 638                                         "/usr/local/lib/systemd/user",
 639                                         USER_DATA_UNIT_PATH,
 640                                         "/usr/lib/systemd/user",
 641                                         STRV_IFNOTNULL(generator_late));
 642                         break;
 643
 644                 case UNIT_FILE_USER:
 645                         add = user_dirs(persistent_config, runtime_config,
 646                                         global_persistent_config, global_runtime_config,
 647                                         generator, generator_early, generator_late,
 648                                         transient,
 649                                         persistent_control, runtime_control);
 650                         break;
 651
 652                 default:
 653                         assert_not_reached("Hmm, unexpected scope?");
 654                 }
 655
 656                 if (!add)
 657                         return -ENOMEM;
 658
 659                 if (paths) {
 660                         r = strv_extend_strv(&paths, add, true);
 661                         if (r < 0)
 662                                 return r;
 663                 } else
 664                         /* Small optimization: if paths is NULL (and it usually is), we can simply assign 'add' to it,
 665                          * and don't have to copy anything */
 666                         paths = TAKE_PTR(add);
 667         }
 668
 669         r = patch_root_prefix(&persistent_config, root);
 670         if (r < 0)
 671                 return r;
 672         r = patch_root_prefix(&runtime_config, root);
 673         if (r < 0)
 674                 return r;
 675
 676         r = patch_root_prefix(&generator, root);
 677         if (r < 0)
 678                 return r;
 679         r = patch_root_prefix(&generator_early, root);
 680         if (r < 0)
 681                 return r;
 682         r = patch_root_prefix(&generator_late, root);
 683         if (r < 0)
 684                 return r;
 685
 686         r = patch_root_prefix(&transient, root);
 687         if (r < 0)
 688                 return r;
 689
 690         r = patch_root_prefix(&persistent_control, root);
 691         if (r < 0)
 692                 return r;
 693         r = patch_root_prefix(&runtime_control, root);
 694         if (r < 0)
 695                 return r;
 696
 697         r = patch_root_prefix(&persistent_attached, root);
 698         if (r < 0)
 699                 return r;
 700         r = patch_root_prefix(&runtime_attached, root);
 701         if (r < 0)
 702                 return r;
 703
 704         r = patch_root_prefix_strv(paths, root);
 705         if (r < 0)
 706                 return -ENOMEM;
 707
 708         *p = (LookupPaths) {
 709                 .search_path = strv_uniq(paths),
 710
 711                 .persistent_config = TAKE_PTR(persistent_config),
 712                 .runtime_config = TAKE_PTR(runtime_config),
 713
 714                 .generator = TAKE_PTR(generator),
 715                 .generator_early = TAKE_PTR(generator_early),
 716                 .generator_late = TAKE_PTR(generator_late),
 717
 718                 .transient = TAKE_PTR(transient),
 719
 720                 .persistent_control = TAKE_PTR(persistent_control),
 721                 .runtime_control = TAKE_PTR(runtime_control),
 722
 723                 .persistent_attached = TAKE_PTR(persistent_attached),
 724                 .runtime_attached = TAKE_PTR(runtime_attached),
 725
 726                 .root_dir = TAKE_PTR(root),
 727                 .temporary_dir = TAKE_PTR(tempdir),
 728         };
 729
 730         paths = NULL;
 731         return 0;
 732 }
 733
 734 void lookup_paths_free(LookupPaths *p) {
 735         if (!p)
 736                 return;
 737
 738         p->search_path = strv_free(p->search_path);
 739
 740         p->persistent_config = mfree(p->persistent_config);
 741         p->runtime_config = mfree(p->runtime_config);
 742
 743         p->persistent_attached = mfree(p->persistent_attached);
 744         p->runtime_attached = mfree(p->runtime_attached);
 745
 746         p->generator = mfree(p->generator);
 747         p->generator_early = mfree(p->generator_early);
 748         p->generator_late = mfree(p->generator_late);
 749
 750         p->transient = mfree(p->transient);
 751
 752         p->persistent_control = mfree(p->persistent_control);
 753         p->runtime_control = mfree(p->runtime_control);
 754
 755         p->root_dir = mfree(p->root_dir);
 756         p->temporary_dir = mfree(p->temporary_dir);
 757 }
 758
 759 int lookup_paths_reduce(LookupPaths *p) {
 760         _cleanup_free_ struct stat *stats = NULL;
 761         size_t n_stats = 0, allocated = 0;
 762         size_t c = 0;
 763         int r;
 764
 765         assert(p);
 766
 767         /* Drop duplicates and non-existing directories from the search path. We figure out whether two directories are
 768          * the same by comparing their device and inode numbers. */
 769
 770         if (!p->search_path)
 771                 return 0;
 772
 773         while (p->search_path[c]) {
 774                 struct stat st;
 775                 size_t k;
 776
 777                 /* Never strip the transient and control directories from the path */
 778                 if (path_equal_ptr(p->search_path[c], p->transient) ||
 779                     path_equal_ptr(p->search_path[c], p->persistent_control) ||
 780                     path_equal_ptr(p->search_path[c], p->runtime_control)) {
 781                         c++;
 782                         continue;
 783                 }
 784
 785                 r = chase_symlinks_and_stat(p->search_path[c], p->root_dir, 0, NULL, &st);
 786                 if (r == -ENOENT)
 787                         goto remove_item;
 788                 if (r < 0) {
 789                         /* If something we don't grok happened, let's better leave it in. */
 790                         log_debug_errno(r, "Failed to chase and stat %s: %m", p->search_path[c]);
 791                         c++;
 792                         continue;
 793                 }
 794
 795                 for (k = 0; k < n_stats; k++)
 796                         if (stats[k].st_dev == st.st_dev &&
 797                             stats[k].st_ino == st.st_ino)
 798                                 break;
 799
 800                 if (k < n_stats) /* Is there already an entry with the same device/inode? */
 801                         goto remove_item;
 802
 803                 if (!GREEDY_REALLOC(stats, allocated, n_stats+1))
 804                         return -ENOMEM;
 805
 806                 stats[n_stats++] = st;
 807                 c++;
 808                 continue;
 809
 810         remove_item:
 811                 free(p->search_path[c]);
 812                 memmove(p->search_path + c,
 813                         p->search_path + c + 1,
 814                         (strv_length(p->search_path + c + 1) + 1) * sizeof(char*));
 815         }
 816
 817         if (strv_isempty(p->search_path)) {
 818                 log_debug("Ignoring unit files.");
 819                 p->search_path = strv_free(p->search_path);
 820         } else {
 821                 _cleanup_free_ char *t;
 822
 823                 t = strv_join(p->search_path, "\n\t");
 824                 if (!t)
 825                         return -ENOMEM;
 826
 827                 log_debug("Looking for unit files in (higher priority first):\n\t%s", t);
 828         }
 829
 830         return 0;
 831 }
 832
 833 int lookup_paths_mkdir_generator(LookupPaths *p) {
 834         int r, q;
 835
 836         assert(p);
 837
 838         if (!p->generator || !p->generator_early || !p->generator_late)
 839                 return -EINVAL;
 840
 841         r = mkdir_p_label(p->generator, 0755);
 842
 843         q = mkdir_p_label(p->generator_early, 0755);
 844         if (q < 0 && r >= 0)
 845                 r = q;
 846
 847         q = mkdir_p_label(p->generator_late, 0755);
 848         if (q < 0 && r >= 0)
 849                 r = q;
 850
 851         return r;
 852 }
 853
 854 void lookup_paths_trim_generator(LookupPaths *p) {
 855         assert(p);
 856
 857         /* Trim empty dirs */
 858
 859         if (p->generator)
 860                 (void) rmdir(p->generator);
 861         if (p->generator_early)
 862                 (void) rmdir(p->generator_early);
 863         if (p->generator_late)
 864                 (void) rmdir(p->generator_late);
 865 }
 866
 867 void lookup_paths_flush_generator(LookupPaths *p) {
 868         assert(p);
 869
 870         /* Flush the generated unit files in full */
 871
 872         if (p->generator)
 873                 (void) rm_rf(p->generator, REMOVE_ROOT|REMOVE_PHYSICAL);
 874         if (p->generator_early)
 875                 (void) rm_rf(p->generator_early, REMOVE_ROOT|REMOVE_PHYSICAL);
 876         if (p->generator_late)
 877                 (void) rm_rf(p->generator_late, REMOVE_ROOT|REMOVE_PHYSICAL);
 878
 879         if (p->temporary_dir)
 880                 (void) rm_rf(p->temporary_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 881 }
 882
 883 char **generator_binary_paths(UnitFileScope scope) {
 884
 885         switch (scope) {
 886
 887         case UNIT_FILE_SYSTEM:
 888                 return strv_new("/run/systemd/system-generators",
 889                                 "/etc/systemd/system-generators",
 890                                 "/usr/local/lib/systemd/system-generators",
 891                                 SYSTEM_GENERATOR_PATH);
 892
 893         case UNIT_FILE_GLOBAL:
 894         case UNIT_FILE_USER:
 895                 return strv_new("/run/systemd/user-generators",
 896                                 "/etc/systemd/user-generators",
 897                                 "/usr/local/lib/systemd/user-generators",
 898                                 USER_GENERATOR_PATH);
 899
 900         default:
 901                 assert_not_reached("Hmm, unexpected scope.");
 902         }
 903 }