src/shared/path-lookup.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "alloc-util.h"
  26 #include "install.h"
  27 #include "log.h"
  28 #include "macro.h"
  29 #include "mkdir.h"
  30 #include "path-lookup.h"
  31 #include "path-util.h"
  32 #include "rm-rf.h"
  33 #include "stat-util.h"
  34 #include "string-util.h"
  35 #include "strv.h"
  36 #include "user-util.h"
  37 #include "util.h"
  38
  39 static int user_runtime_dir(char **ret, const char *suffix) {
  40         const char *e;
  41         char *j;
  42
  43         assert(ret);
  44         assert(suffix);
  45
  46         e = getenv("XDG_RUNTIME_DIR");
  47         if (!e)
  48                 return -ENXIO;
  49
  50         j = strappend(e, suffix);
  51         if (!j)
  52                 return -ENOMEM;
  53
  54         *ret = j;
  55         return 0;
  56 }
  57
  58 static int user_config_dir(char **ret, const char *suffix) {
  59         const char *e;
  60         char *j;
  61         int r;
  62
  63         assert(ret);
  64
  65         e = getenv("XDG_CONFIG_HOME");
  66         if (e)
  67                 j = strappend(e, suffix);
  68         else {
  69                 _cleanup_free_ char *home = NULL;
  70
  71                 r = get_home_dir(&home);
  72                 if (r < 0)
  73                         return r;
  74
  75                 j = strjoin(home, "/.config", suffix);
  76         }
  77
  78         if (!j)
  79                 return -ENOMEM;
  80
  81         *ret = j;
  82         return 0;
  83 }
  84
  85 static int user_data_dir(char **ret, const char *suffix) {
  86         const char *e;
  87         char *j;
  88         int r;
  89
  90         assert(ret);
  91         assert(suffix);
  92
  93         /* We don't treat /etc/xdg/systemd here as the spec
  94          * suggests because we assume that is a link to
  95          * /etc/systemd/ anyway. */
  96
  97         e = getenv("XDG_DATA_HOME");
  98         if (e)
  99                 j = strappend(e, suffix);
 100         else {
 101                 _cleanup_free_ char *home = NULL;
 102
 103                 r = get_home_dir(&home);
 104                 if (r < 0)
 105                         return r;
 106
 107                 j = strjoin(home, "/.local/share", suffix);
 108         }
 109         if (!j)
 110                 return -ENOMEM;
 111
 112         *ret = j;
 113         return 1;
 114 }
 115
 116 static char** user_dirs(
 117                 const char *persistent_config,
 118                 const char *runtime_config,
 119                 const char *generator,
 120                 const char *generator_early,
 121                 const char *generator_late,
 122                 const char *transient,
 123                 const char *persistent_control,
 124                 const char *runtime_control) {
 125
 126         const char * const config_unit_paths[] = {
 127                 USER_CONFIG_UNIT_PATH,
 128                 "/etc/systemd/user",
 129                 NULL
 130         };
 131
 132         const char * const data_unit_paths[] = {
 133                 "/usr/local/lib/systemd/user",
 134                 "/usr/local/share/systemd/user",
 135                 USER_DATA_UNIT_PATH,
 136                 "/usr/lib/systemd/user",
 137                 "/usr/share/systemd/user",
 138                 NULL
 139         };
 140
 141         _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
 142         _cleanup_free_ char *data_home = NULL;
 143         _cleanup_strv_free_ char **res = NULL;
 144         const char *e;
 145         char **tmp;
 146         int r;
 147
 148         /* Implement the mechanisms defined in
 149          *
 150          * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
 151          *
 152          * We look in both the config and the data dirs because we
 153          * want to encourage that distributors ship their unit files
 154          * as data, and allow overriding as configuration.
 155          */
 156
 157         e = getenv("XDG_CONFIG_DIRS");
 158         if (e) {
 159                 config_dirs = strv_split(e, ":");
 160                 if (!config_dirs)
 161                         return NULL;
 162         }
 163
 164         r = user_data_dir(&data_home, "/systemd/user");
 165         if (r < 0 && r != -ENXIO)
 166                 return NULL;
 167
 168         e = getenv("XDG_DATA_DIRS");
 169         if (e)
 170                 data_dirs = strv_split(e, ":");
 171         else
 172                 data_dirs = strv_new("/usr/local/share",
 173                                      "/usr/share",
 174                                      NULL);
 175         if (!data_dirs)
 176                 return NULL;
 177
 178         /* Now merge everything we found. */
 179         if (strv_extend(&res, persistent_control) < 0)
 180                 return NULL;
 181
 182         if (strv_extend(&res, runtime_control) < 0)
 183                 return NULL;
 184
 185         if (strv_extend(&res, transient) < 0)
 186                 return NULL;
 187
 188         if (strv_extend(&res, generator_early) < 0)
 189                 return NULL;
 190
 191         if (strv_extend_strv_concat(&res, config_dirs, "/systemd/user") < 0)
 192                 return NULL;
 193
 194         if (strv_extend(&res, persistent_config) < 0)
 195                 return NULL;
 196
 197         if (strv_extend_strv(&res, (char**) config_unit_paths, false) < 0)
 198                 return NULL;
 199
 200         if (strv_extend(&res, runtime_config) < 0)
 201                 return NULL;
 202
 203         if (strv_extend(&res, generator) < 0)
 204                 return NULL;
 205
 206         if (strv_extend(&res, data_home) < 0)
 207                 return NULL;
 208
 209         if (strv_extend_strv_concat(&res, data_dirs, "/systemd/user") < 0)
 210                 return NULL;
 211
 212         if (strv_extend_strv(&res, (char**) data_unit_paths, false) < 0)
 213                 return NULL;
 214
 215         if (strv_extend(&res, generator_late) < 0)
 216                 return NULL;
 217
 218         if (path_strv_make_absolute_cwd(res) < 0)
 219                 return NULL;
 220
 221         tmp = res;
 222         res = NULL;
 223
 224         return tmp;
 225 }
 226
 227 static int acquire_generator_dirs(
 228                 UnitFileScope scope,
 229                 char **generator,
 230                 char **generator_early,
 231                 char **generator_late) {
 232
 233         _cleanup_free_ char *x = NULL, *y = NULL, *z = NULL;
 234         const char *prefix;
 235
 236         assert(generator);
 237         assert(generator_early);
 238         assert(generator_late);
 239
 240         switch (scope) {
 241
 242         case UNIT_FILE_SYSTEM:
 243                 prefix = "/run/systemd/";
 244                 break;
 245
 246         case UNIT_FILE_USER: {
 247                 const char *e;
 248
 249                 e = getenv("XDG_RUNTIME_DIR");
 250                 if (!e)
 251                         return -ENXIO;
 252
 253                 prefix = strjoina(e, "/systemd/");
 254                 break;
 255         }
 256
 257         case UNIT_FILE_GLOBAL:
 258                 return -EOPNOTSUPP;
 259
 260         default:
 261                 assert_not_reached("Hmm, unexpected scope value.");
 262         }
 263
 264         x = strappend(prefix, "generator");
 265         if (!x)
 266                 return -ENOMEM;
 267
 268         y = strappend(prefix, "generator.early");
 269         if (!y)
 270                 return -ENOMEM;
 271
 272         z = strappend(prefix, "generator.late");
 273         if (!z)
 274                 return -ENOMEM;
 275
 276         *generator = x;
 277         *generator_early = y;
 278         *generator_late = z;
 279
 280         x = y = z = NULL;
 281         return 0;
 282 }
 283
 284 static int acquire_transient_dir(UnitFileScope scope, char **ret) {
 285         assert(ret);
 286
 287         switch (scope) {
 288
 289         case UNIT_FILE_SYSTEM: {
 290                 char *transient;
 291
 292                 transient = strdup("/run/systemd/transient");
 293                 if (!transient)
 294                         return -ENOMEM;
 295
 296                 *ret = transient;
 297                 return 0;
 298         }
 299
 300         case UNIT_FILE_USER:
 301                 return user_runtime_dir(ret, "/systemd/transient");
 302
 303         case UNIT_FILE_GLOBAL:
 304                 return -EOPNOTSUPP;
 305
 306         default:
 307                 assert_not_reached("Hmm, unexpected scope value.");
 308         }
 309 }
 310
 311 static int acquire_config_dirs(UnitFileScope scope, char **persistent, char **runtime) {
 312         _cleanup_free_ char *a = NULL, *b = NULL;
 313         int r;
 314
 315         assert(persistent);
 316         assert(runtime);
 317
 318         switch (scope) {
 319
 320         case UNIT_FILE_SYSTEM:
 321                 a = strdup(SYSTEM_CONFIG_UNIT_PATH);
 322                 b = strdup("/run/systemd/system");
 323                 break;
 324
 325         case UNIT_FILE_GLOBAL:
 326                 a = strdup(USER_CONFIG_UNIT_PATH);
 327                 b = strdup("/run/systemd/user");
 328                 break;
 329
 330         case UNIT_FILE_USER:
 331                 r = user_config_dir(&a, "/systemd/user");
 332                 if (r < 0 && r != -ENXIO)
 333                         return r;
 334
 335                 r = user_runtime_dir(runtime, "/systemd/user");
 336                 if (r < 0) {
 337                         if (r != -ENXIO)
 338                                 return r;
 339
 340                         /* If XDG_RUNTIME_DIR is not set, don't consider that fatal, simply initialize the runtime
 341                          * directory to NULL */
 342                         *runtime = NULL;
 343                 }
 344
 345                 *persistent = a;
 346                 a = NULL;
 347
 348                 return 0;
 349
 350         default:
 351                 assert_not_reached("Hmm, unexpected scope value.");
 352         }
 353
 354         if (!a || !b)
 355                 return -ENOMEM;
 356
 357         *persistent = a;
 358         *runtime = b;
 359         a = b = NULL;
 360
 361         return 0;
 362 }
 363
 364 static int acquire_control_dirs(UnitFileScope scope, char **persistent, char **runtime) {
 365         _cleanup_free_ char *a = NULL;
 366         int r;
 367
 368         assert(persistent);
 369         assert(runtime);
 370
 371         switch (scope) {
 372
 373         case UNIT_FILE_SYSTEM:  {
 374                 _cleanup_free_ char *b = NULL;
 375
 376                 a = strdup("/etc/systemd/system.control");
 377                 if (!a)
 378                         return -ENOMEM;
 379
 380                 b = strdup("/run/systemd/system.control");
 381                 if (!b)
 382                         return -ENOMEM;
 383
 384                 *runtime = b;
 385                 b = NULL;
 386
 387                 break;
 388         }
 389
 390         case UNIT_FILE_USER:
 391                 r = user_config_dir(&a, "/systemd/system.control");
 392                 if (r < 0 && r != -ENXIO)
 393                         return r;
 394
 395                 r = user_runtime_dir(runtime, "/systemd/system.control");
 396                 if (r < 0) {
 397                         if (r != -ENXIO)
 398                                 return r;
 399
 400                         /* If XDG_RUNTIME_DIR is not set, don't consider this fatal, simply initialize the directory to
 401                          * NULL */
 402                         *runtime = NULL;
 403                 }
 404
 405                 break;
 406
 407         case UNIT_FILE_GLOBAL:
 408                 return -EOPNOTSUPP;
 409
 410         default:
 411                 assert_not_reached("Hmm, unexpected scope value.");
 412         }
 413
 414         *persistent = a;
 415         a = NULL;
 416
 417         return 0;
 418 }
 419
 420 static int patch_root_prefix(char **p, const char *root_dir) {
 421         char *c;
 422
 423         assert(p);
 424
 425         if (!*p)
 426                 return 0;
 427
 428         c = prefix_root(root_dir, *p);
 429         if (!c)
 430                 return -ENOMEM;
 431
 432         free(*p);
 433         *p = c;
 434
 435         return 0;
 436 }
 437
 438 static int patch_root_prefix_strv(char **l, const char *root_dir) {
 439         char **i;
 440         int r;
 441
 442         if (!root_dir)
 443                 return 0;
 444
 445         STRV_FOREACH(i, l) {
 446                 r = patch_root_prefix(i, root_dir);
 447                 if (r < 0)
 448                         return r;
 449         }
 450
 451         return 0;
 452 }
 453
 454 int lookup_paths_init(
 455                 LookupPaths *p,
 456                 UnitFileScope scope,
 457                 LookupPathsFlags flags,
 458                 const char *root_dir) {
 459
 460         _cleanup_free_ char
 461                 *root = NULL,
 462                 *persistent_config = NULL, *runtime_config = NULL,
 463                 *generator = NULL, *generator_early = NULL, *generator_late = NULL,
 464                 *transient = NULL,
 465                 *persistent_control = NULL, *runtime_control = NULL;
 466         bool append = false; /* Add items from SYSTEMD_UNIT_PATH before normal directories */
 467         _cleanup_strv_free_ char **paths = NULL;
 468         const char *e;
 469         int r;
 470
 471         assert(p);
 472         assert(scope >= 0);
 473         assert(scope < _UNIT_FILE_SCOPE_MAX);
 474
 475         if (!isempty(root_dir) && !path_equal(root_dir, "/")) {
 476                 if (scope == UNIT_FILE_USER)
 477                         return -EINVAL;
 478
 479                 r = is_dir(root_dir, true);
 480                 if (r < 0)
 481                         return r;
 482                 if (r == 0)
 483                         return -ENOTDIR;
 484
 485                 root = strdup(root_dir);
 486                 if (!root)
 487                         return -ENOMEM;
 488         }
 489
 490         /* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_config to NULL */
 491         r = acquire_config_dirs(scope, &persistent_config, &runtime_config);
 492         if (r < 0)
 493                 return r;
 494
 495         if ((flags & LOOKUP_PATHS_EXCLUDE_GENERATED) == 0) {
 496                 /* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
 497                 r = acquire_generator_dirs(scope, &generator, &generator_early, &generator_late);
 498                 if (r < 0 && r != -EOPNOTSUPP && r != -ENXIO)
 499                         return r;
 500         }
 501
 502         /* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
 503         r = acquire_transient_dir(scope, &transient);
 504         if (r < 0 && r != -EOPNOTSUPP && r != -ENXIO)
 505                 return r;
 506
 507         /* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_control to NULL */
 508         r = acquire_control_dirs(scope, &persistent_control, &runtime_control);
 509         if (r < 0 && r != -EOPNOTSUPP)
 510                 return r;
 511
 512         /* First priority is whatever has been passed to us via env vars */
 513         e = getenv("SYSTEMD_UNIT_PATH");
 514         if (e) {
 515                 const char *k;
 516
 517                 k = endswith(e, ":");
 518                 if (k) {
 519                         e = strndupa(e, k - e);
 520                         append = true;
 521                 }
 522
 523                 /* FIXME: empty components in other places should be
 524                  * rejected. */
 525
 526                 r = path_split_and_make_absolute(e, &paths);
 527                 if (r < 0)
 528                         return r;
 529         }
 530
 531         if (!paths || append) {
 532                 /* Let's figure something out. */
 533
 534                 _cleanup_strv_free_ char **add = NULL;
 535
 536                 /* For the user units we include share/ in the search
 537                  * path in order to comply with the XDG basedir spec.
 538                  * For the system stuff we avoid such nonsense. OTOH
 539                  * we include /lib in the search path for the system
 540                  * stuff but avoid it for user stuff. */
 541
 542                 switch (scope) {
 543
 544                 case UNIT_FILE_SYSTEM:
 545                         add = strv_new(
 546                                         /* If you modify this you also want to modify
 547                                          * systemdsystemunitpath= in systemd.pc.in! */
 548                                         STRV_IFNOTNULL(persistent_control),
 549                                         STRV_IFNOTNULL(runtime_control),
 550                                         STRV_IFNOTNULL(transient),
 551                                         STRV_IFNOTNULL(generator_early),
 552                                         persistent_config,
 553                                         SYSTEM_CONFIG_UNIT_PATH,
 554                                         "/etc/systemd/system",
 555                                         runtime_config,
 556                                         "/run/systemd/system",
 557                                         STRV_IFNOTNULL(generator),
 558                                         "/usr/local/lib/systemd/system",
 559                                         SYSTEM_DATA_UNIT_PATH,
 560                                         "/usr/lib/systemd/system",
 561 #ifdef HAVE_SPLIT_USR
 562                                         "/lib/systemd/system",
 563 #endif
 564                                         STRV_IFNOTNULL(generator_late),
 565                                         NULL);
 566                         break;
 567
 568                 case UNIT_FILE_GLOBAL:
 569                         add = strv_new(
 570                                         /* If you modify this you also want to modify
 571                                          * systemduserunitpath= in systemd.pc.in, and
 572                                          * the arrays in user_dirs() above! */
 573                                         STRV_IFNOTNULL(persistent_control),
 574                                         STRV_IFNOTNULL(runtime_control),
 575                                         STRV_IFNOTNULL(transient),
 576                                         STRV_IFNOTNULL(generator_early),
 577                                         persistent_config,
 578                                         USER_CONFIG_UNIT_PATH,
 579                                         "/etc/systemd/user",
 580                                         runtime_config,
 581                                         "/run/systemd/user",
 582                                         STRV_IFNOTNULL(generator),
 583                                         "/usr/local/lib/systemd/user",
 584                                         "/usr/local/share/systemd/user",
 585                                         USER_DATA_UNIT_PATH,
 586                                         "/usr/lib/systemd/user",
 587                                         "/usr/share/systemd/user",
 588                                         STRV_IFNOTNULL(generator_late),
 589                                         NULL);
 590                         break;
 591
 592                 case UNIT_FILE_USER:
 593                         add = user_dirs(persistent_config, runtime_config,
 594                                         generator, generator_early, generator_late,
 595                                         transient,
 596                                         persistent_config, runtime_control);
 597                         break;
 598
 599                 default:
 600                         assert_not_reached("Hmm, unexpected scope?");
 601                 }
 602
 603                 if (!add)
 604                         return -ENOMEM;
 605
 606                 if (paths) {
 607                         r = strv_extend_strv(&paths, add, true);
 608                         if (r < 0)
 609                                 return r;
 610                 } else {
 611                         /* Small optimization: if paths is NULL (and it usually is), we can simply assign 'add' to it,
 612                          * and don't have to copy anything */
 613                         paths = add;
 614                         add = NULL;
 615                 }
 616         }
 617
 618         r = patch_root_prefix(&persistent_config, root);
 619         if (r < 0)
 620                 return r;
 621         r = patch_root_prefix(&runtime_config, root);
 622         if (r < 0)
 623                 return r;
 624
 625         r = patch_root_prefix(&generator, root);
 626         if (r < 0)
 627                 return r;
 628         r = patch_root_prefix(&generator_early, root);
 629         if (r < 0)
 630                 return r;
 631         r = patch_root_prefix(&generator_late, root);
 632         if (r < 0)
 633                 return r;
 634
 635         r = patch_root_prefix(&transient, root);
 636         if (r < 0)
 637                 return r;
 638
 639         r = patch_root_prefix(&persistent_control, root);
 640         if (r < 0)
 641                 return r;
 642
 643         r = patch_root_prefix(&runtime_control, root);
 644         if (r < 0)
 645                 return r;
 646
 647         r = patch_root_prefix_strv(paths, root);
 648         if (r < 0)
 649                 return -ENOMEM;
 650
 651         p->search_path = strv_uniq(paths);
 652         paths = NULL;
 653
 654         p->persistent_config = persistent_config;
 655         p->runtime_config = runtime_config;
 656         persistent_config = runtime_config = NULL;
 657
 658         p->generator = generator;
 659         p->generator_early = generator_early;
 660         p->generator_late = generator_late;
 661         generator = generator_early = generator_late = NULL;
 662
 663         p->transient = transient;
 664         transient = NULL;
 665
 666         p->persistent_control = persistent_control;
 667         p->runtime_control = runtime_control;
 668         persistent_control = runtime_control = NULL;
 669
 670         p->root_dir = root;
 671         root = NULL;
 672
 673         return 0;
 674 }
 675
 676 void lookup_paths_free(LookupPaths *p) {
 677         if (!p)
 678                 return;
 679
 680         p->search_path = strv_free(p->search_path);
 681
 682         p->persistent_config = mfree(p->persistent_config);
 683         p->runtime_config = mfree(p->runtime_config);
 684
 685         p->generator = mfree(p->generator);
 686         p->generator_early = mfree(p->generator_early);
 687         p->generator_late = mfree(p->generator_late);
 688
 689         p->transient = mfree(p->transient);
 690
 691         p->persistent_control = mfree(p->persistent_control);
 692         p->runtime_control = mfree(p->runtime_control);
 693
 694         p->root_dir = mfree(p->root_dir);
 695 }
 696
 697 int lookup_paths_reduce(LookupPaths *p) {
 698         _cleanup_free_ struct stat *stats = NULL;
 699         size_t n_stats = 0, allocated = 0;
 700         unsigned c = 0;
 701         int r;
 702
 703         assert(p);
 704
 705         /* Drop duplicates and non-existing directories from the search path. We figure out whether two directories are
 706          * the same by comparing their device and inode numbers. Note one special tweak: when we have a root path set,
 707          * we do not follow symlinks when retrieving them, because the kernel wouldn't take the root prefix into
 708          * account when following symlinks. When we have no root path set this restriction does not apply however. */
 709
 710         if (!p->search_path)
 711                 return 0;
 712
 713         while (p->search_path[c]) {
 714                 struct stat st;
 715                 unsigned k;
 716
 717                 if (p->root_dir)
 718                         r = lstat(p->search_path[c], &st);
 719                 else
 720                         r = stat(p->search_path[c], &st);
 721                 if (r < 0) {
 722                         if (errno == ENOENT)
 723                                 goto remove_item;
 724
 725                         /* If something we don't grok happened, let's better leave it in. */
 726                         log_debug_errno(errno, "Failed to stat %s: %m", p->search_path[c]);
 727                         c++;
 728                         continue;
 729                 }
 730
 731                 for (k = 0; k < n_stats; k++) {
 732                         if (stats[k].st_dev == st.st_dev &&
 733                             stats[k].st_ino == st.st_ino)
 734                                 break;
 735                 }
 736
 737                 if (k < n_stats) /* Is there already an entry with the same device/inode? */
 738                         goto remove_item;
 739
 740                 if (!GREEDY_REALLOC(stats, allocated, n_stats+1))
 741                         return -ENOMEM;
 742
 743                 stats[n_stats++] = st;
 744                 c++;
 745                 continue;
 746
 747         remove_item:
 748                 free(p->search_path[c]);
 749                 memmove(p->search_path + c,
 750                         p->search_path + c + 1,
 751                         (strv_length(p->search_path + c + 1) + 1) * sizeof(char*));
 752         }
 753
 754         if (strv_isempty(p->search_path)) {
 755                 log_debug("Ignoring unit files.");
 756                 p->search_path = strv_free(p->search_path);
 757         } else {
 758                 _cleanup_free_ char *t;
 759
 760                 t = strv_join(p->search_path, "\n\t");
 761                 if (!t)
 762                         return -ENOMEM;
 763
 764                 log_debug("Looking for unit files in (higher priority first):\n\t%s", t);
 765         }
 766
 767         return 0;
 768 }
 769
 770 int lookup_paths_mkdir_generator(LookupPaths *p) {
 771         int r, q;
 772
 773         assert(p);
 774
 775         if (!p->generator || !p->generator_early || !p->generator_late)
 776                 return -EINVAL;
 777
 778         r = mkdir_p_label(p->generator, 0755);
 779
 780         q = mkdir_p_label(p->generator_early, 0755);
 781         if (q < 0 && r >= 0)
 782                 r = q;
 783
 784         q = mkdir_p_label(p->generator_late, 0755);
 785         if (q < 0 && r >= 0)
 786                 r = q;
 787
 788         return r;
 789 }
 790
 791 void lookup_paths_trim_generator(LookupPaths *p) {
 792         assert(p);
 793
 794         /* Trim empty dirs */
 795
 796         if (p->generator)
 797                 (void) rmdir(p->generator);
 798         if (p->generator_early)
 799                 (void) rmdir(p->generator_early);
 800         if (p->generator_late)
 801                 (void) rmdir(p->generator_late);
 802 }
 803
 804 void lookup_paths_flush_generator(LookupPaths *p) {
 805         assert(p);
 806
 807         /* Flush the generated unit files in full */
 808
 809         if (p->generator)
 810                 (void) rm_rf(p->generator, REMOVE_ROOT);
 811         if (p->generator_early)
 812                 (void) rm_rf(p->generator_early, REMOVE_ROOT);
 813         if (p->generator_late)
 814                 (void) rm_rf(p->generator_late, REMOVE_ROOT);
 815 }
 816
 817 char **generator_binary_paths(UnitFileScope scope) {
 818
 819         switch (scope) {
 820
 821         case UNIT_FILE_SYSTEM:
 822                 return strv_new("/run/systemd/system-generators",
 823                                 "/etc/systemd/system-generators",
 824                                 "/usr/local/lib/systemd/system-generators",
 825                                 SYSTEM_GENERATOR_PATH,
 826                                 NULL);
 827
 828         case UNIT_FILE_GLOBAL:
 829         case UNIT_FILE_USER:
 830                 return strv_new("/run/systemd/user-generators",
 831                                 "/etc/systemd/user-generators",
 832                                 "/usr/local/lib/systemd/user-generators",
 833                                 USER_GENERATOR_PATH,
 834                                 NULL);
 835
 836         default:
 837                 assert_not_reached("Hmm, unexpected scope.");
 838         }
 839 }