load-fragment.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <linux/oom.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sched.h>
  29 #include <sys/prctl.h>
  30
  31 #include "unit.h"
  32 #include "strv.h"
  33 #include "conf-parser.h"
  34 #include "load-fragment.h"
  35 #include "log.h"
  36 #include "ioprio.h"
  37 #include "securebits.h"
  38 #include "missing.h"
  39
  40 static int config_parse_deps(
  41                 const char *filename,
  42                 unsigned line,
  43                 const char *section,
  44                 const char *lvalue,
  45                 const char *rvalue,
  46                 void *data,
  47                 void *userdata) {
  48
  49         UnitDependency d = PTR_TO_UINT(data);
  50         Unit *u = userdata;
  51         char *w;
  52         size_t l;
  53         char *state;
  54
  55         assert(filename);
  56         assert(lvalue);
  57         assert(rvalue);
  58
  59         if (UNIT_VTABLE(u)->refuse_requires &&
  60             (d == UNIT_REQUIRES ||
  61              d == UNIT_SOFT_REQUIRES ||
  62              d == UNIT_REQUISITE ||
  63              d == UNIT_SOFT_REQUISITE)) {
  64                     log_error("[%s:%u] Dependency of type %s not acceptable for this unit type.", filename, line, lvalue);
  65                     return -EBADMSG;
  66             }
  67
  68         FOREACH_WORD(w, l, rvalue, state) {
  69                 char *t;
  70                 int r;
  71
  72                 if (!(t = strndup(w, l)))
  73                         return -ENOMEM;
  74
  75                 r = unit_add_dependency_by_name(u, d, t);
  76                 free(t);
  77
  78                 if (r < 0)
  79                         return r;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int config_parse_names(
  86                 const char *filename,
  87                 unsigned line,
  88                 const char *section,
  89                 const char *lvalue,
  90                 const char *rvalue,
  91                 void *data,
  92                 void *userdata) {
  93
  94         Unit *u = userdata;
  95         char *w;
  96         size_t l;
  97         char *state;
  98
  99         assert(filename);
 100         assert(lvalue);
 101         assert(rvalue);
 102         assert(data);
 103
 104         FOREACH_WORD(w, l, rvalue, state) {
 105                 char *t;
 106                 int r;
 107
 108                 if (!(t = strndup(w, l)))
 109                         return -ENOMEM;
 110
 111                 r = unit_merge_by_name(u, t);
 112                 free(t);
 113
 114                 if (r < 0)
 115                         return r;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static int config_parse_listen(
 122                 const char *filename,
 123                 unsigned line,
 124                 const char *section,
 125                 const char *lvalue,
 126                 const char *rvalue,
 127                 void *data,
 128                 void *userdata) {
 129
 130         int r;
 131         SocketPort *p;
 132         Socket *s;
 133
 134         assert(filename);
 135         assert(lvalue);
 136         assert(rvalue);
 137         assert(data);
 138
 139         s = (Socket*) data;
 140
 141         if (!(p = new0(SocketPort, 1)))
 142                 return -ENOMEM;
 143
 144         if (streq(lvalue, "ListenFIFO")) {
 145                 p->type = SOCKET_FIFO;
 146
 147                 if (!(p->path = strdup(rvalue))) {
 148                         free(p);
 149                         return -ENOMEM;
 150                 }
 151         } else {
 152                 p->type = SOCKET_SOCKET;
 153
 154                 if ((r = socket_address_parse(&p->address, rvalue)) < 0) {
 155                         log_error("[%s:%u] Failed to parse address value: %s", filename, line, rvalue);
 156                         free(p);
 157                         return r;
 158                 }
 159
 160                 if (streq(lvalue, "ListenStream"))
 161                         p->address.type = SOCK_STREAM;
 162                 else if (streq(lvalue, "ListenDatagram"))
 163                         p->address.type = SOCK_DGRAM;
 164                 else {
 165                         assert(streq(lvalue, "ListenSequentialPacket"));
 166                         p->address.type = SOCK_SEQPACKET;
 167                 }
 168
 169                 if (socket_address_family(&p->address) != AF_LOCAL && p->address.type == SOCK_SEQPACKET) {
 170                         free(p);
 171                         return -EPROTONOSUPPORT;
 172                 }
 173         }
 174
 175         p->fd = -1;
 176         LIST_PREPEND(SocketPort, port, s->ports, p);
 177
 178         return 0;
 179 }
 180
 181 static int config_parse_socket_bind(
 182                 const char *filename,
 183                 unsigned line,
 184                 const char *section,
 185                 const char *lvalue,
 186                 const char *rvalue,
 187                 void *data,
 188                 void *userdata) {
 189
 190         int r;
 191         Socket *s;
 192
 193         assert(filename);
 194         assert(lvalue);
 195         assert(rvalue);
 196         assert(data);
 197
 198         s = (Socket*) data;
 199
 200         if ((r = parse_boolean(rvalue)) < 0) {
 201                 log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 202                 return r;
 203         }
 204
 205         s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 206
 207         return 0;
 208 }
 209
 210 static int config_parse_nice(
 211                 const char *filename,
 212                 unsigned line,
 213                 const char *section,
 214                 const char *lvalue,
 215                 const char *rvalue,
 216                 void *data,
 217                 void *userdata) {
 218
 219         ExecContext *c = data;
 220         int priority, r;
 221
 222         assert(filename);
 223         assert(lvalue);
 224         assert(rvalue);
 225         assert(data);
 226
 227         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 228                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 229                 return r;
 230         }
 231
 232         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 233                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 234                 return -ERANGE;
 235         }
 236
 237         c->nice = priority;
 238         c->nice_set = false;
 239
 240         return 0;
 241 }
 242
 243 static int config_parse_oom_adjust(
 244                 const char *filename,
 245                 unsigned line,
 246                 const char *section,
 247                 const char *lvalue,
 248                 const char *rvalue,
 249                 void *data,
 250                 void *userdata) {
 251
 252         ExecContext *c = data;
 253         int oa, r;
 254
 255         assert(filename);
 256         assert(lvalue);
 257         assert(rvalue);
 258         assert(data);
 259
 260         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 261                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 262                 return r;
 263         }
 264
 265         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 266                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 267                 return -ERANGE;
 268         }
 269
 270         c->oom_adjust = oa;
 271         c->oom_adjust_set = true;
 272
 273         return 0;
 274 }
 275
 276 static int config_parse_mode(
 277                 const char *filename,
 278                 unsigned line,
 279                 const char *section,
 280                 const char *lvalue,
 281                 const char *rvalue,
 282                 void *data,
 283                 void *userdata) {
 284
 285         mode_t *m = data;
 286         long l;
 287         char *x = NULL;
 288
 289         assert(filename);
 290         assert(lvalue);
 291         assert(rvalue);
 292         assert(data);
 293
 294         errno = 0;
 295         l = strtol(rvalue, &x, 8);
 296         if (!x || *x || errno) {
 297                 log_error("[%s:%u] Failed to parse mode value: %s", filename, line, rvalue);
 298                 return errno ? -errno : -EINVAL;
 299         }
 300
 301         if (l < 0000 || l > 07777) {
 302                 log_error("[%s:%u] mode value out of range: %s", filename, line, rvalue);
 303                 return -ERANGE;
 304         }
 305
 306         *m = (mode_t) l;
 307         return 0;
 308 }
 309
 310 static int config_parse_exec(
 311                 const char *filename,
 312                 unsigned line,
 313                 const char *section,
 314                 const char *lvalue,
 315                 const char *rvalue,
 316                 void *data,
 317                 void *userdata) {
 318
 319         ExecCommand **e = data, *nce = NULL;
 320         char **n;
 321         char *w;
 322         unsigned k;
 323         size_t l;
 324         char *state;
 325
 326         assert(filename);
 327         assert(lvalue);
 328         assert(rvalue);
 329         assert(data);
 330
 331         k = 0;
 332         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 333                 k++;
 334
 335         if (!(n = new(char*, k+1)))
 336                 return -ENOMEM;
 337
 338         k = 0;
 339         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 340                 if (!(n[k++] = strndup(w, l)))
 341                         goto fail;
 342
 343         n[k] = NULL;
 344
 345         if (!n[0] || !path_is_absolute(n[0])) {
 346                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 347                 strv_free(n);
 348                 return -EINVAL;
 349         }
 350
 351         if (!(nce = new0(ExecCommand, 1)))
 352                 goto fail;
 353
 354         nce->argv = n;
 355         if (!(nce->path = strdup(n[0])))
 356                 goto fail;
 357
 358         exec_command_append_list(e, nce);
 359
 360         return 0;
 361
 362 fail:
 363         for (; k > 0; k--)
 364                 free(n[k-1]);
 365         free(n);
 366
 367         free(nce);
 368
 369         return -ENOMEM;
 370 }
 371
 372 static int config_parse_usec(
 373                 const char *filename,
 374                 unsigned line,
 375                 const char *section,
 376                 const char *lvalue,
 377                 const char *rvalue,
 378                 void *data,
 379                 void *userdata) {
 380
 381         usec_t *usec = data;
 382         unsigned long long u;
 383         int r;
 384
 385         assert(filename);
 386         assert(lvalue);
 387         assert(rvalue);
 388         assert(data);
 389
 390         if ((r = safe_atollu(rvalue, &u)) < 0) {
 391                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 392                 return r;
 393         }
 394
 395         /* We actually assume the user configures seconds. Later on we
 396          * might choose to support suffixes for time values, to
 397          * configure bigger or smaller units */
 398
 399         *usec = u * USEC_PER_SEC;
 400
 401         return 0;
 402 }
 403
 404 static int config_parse_service_type(
 405                 const char *filename,
 406                 unsigned line,
 407                 const char *section,
 408                 const char *lvalue,
 409                 const char *rvalue,
 410                 void *data,
 411                 void *userdata) {
 412
 413         Service *s = data;
 414         ServiceType x;
 415
 416         assert(filename);
 417         assert(lvalue);
 418         assert(rvalue);
 419         assert(data);
 420
 421         if ((x = service_type_from_string(rvalue)) < 0) {
 422                 log_error("[%s:%u] Failed to parse service type: %s", filename, line, rvalue);
 423                 return -EBADMSG;
 424         }
 425
 426         s->type = x;
 427
 428         return 0;
 429 }
 430
 431 static int config_parse_service_restart(
 432                 const char *filename,
 433                 unsigned line,
 434                 const char *section,
 435                 const char *lvalue,
 436                 const char *rvalue,
 437                 void *data,
 438                 void *userdata) {
 439
 440         Service *s = data;
 441         ServiceRestart x;
 442
 443         assert(filename);
 444         assert(lvalue);
 445         assert(rvalue);
 446         assert(data);
 447
 448         if ((x = service_restart_from_string(rvalue)) < 0) {
 449                 log_error("[%s:%u] Failed to parse service restart specifier: %s", filename, line, rvalue);
 450                 return -EBADMSG;
 451         }
 452
 453         s->restart = x;
 454
 455         return 0;
 456 }
 457
 458 static int config_parse_bindtodevice(
 459                 const char *filename,
 460                 unsigned line,
 461                 const char *section,
 462                 const char *lvalue,
 463                 const char *rvalue,
 464                 void *data,
 465                 void *userdata) {
 466
 467         Socket *s = data;
 468         char *n;
 469
 470         assert(filename);
 471         assert(lvalue);
 472         assert(rvalue);
 473         assert(data);
 474
 475         if (rvalue[0] && !streq(rvalue, "*")) {
 476                 if (!(n = strdup(rvalue)))
 477                         return -ENOMEM;
 478         } else
 479                 n = NULL;
 480
 481         free(s->bind_to_device);
 482         s->bind_to_device = n;
 483
 484         return 0;
 485 }
 486
 487 static int config_parse_output(
 488                 const char *filename,
 489                 unsigned line,
 490                 const char *section,
 491                 const char *lvalue,
 492                 const char *rvalue,
 493                 void *data,
 494                 void *userdata) {
 495
 496         ExecOutput *o = data, x;
 497
 498         assert(filename);
 499         assert(lvalue);
 500         assert(rvalue);
 501         assert(data);
 502
 503         if ((x = exec_output_from_string(rvalue)) < 0) {
 504                 log_error("[%s:%u] Failed to parse output specifier: %s", filename, line, rvalue);
 505                 return -EBADMSG;
 506         }
 507
 508         *o = x;
 509
 510         return 0;
 511 }
 512
 513 static int config_parse_input(
 514                 const char *filename,
 515                 unsigned line,
 516                 const char *section,
 517                 const char *lvalue,
 518                 const char *rvalue,
 519                 void *data,
 520                 void *userdata) {
 521
 522         ExecInput *i = data, x;
 523
 524         assert(filename);
 525         assert(lvalue);
 526         assert(rvalue);
 527         assert(data);
 528
 529         if ((x = exec_input_from_string(rvalue)) < 0) {
 530                 log_error("[%s:%u] Failed to parse input specifier: %s", filename, line, rvalue);
 531                 return -EBADMSG;
 532         }
 533
 534         *i = x;
 535
 536         return 0;
 537 }
 538
 539 static int config_parse_facility(
 540                 const char *filename,
 541                 unsigned line,
 542                 const char *section,
 543                 const char *lvalue,
 544                 const char *rvalue,
 545                 void *data,
 546                 void *userdata) {
 547
 548
 549         int *o = data, x;
 550
 551         assert(filename);
 552         assert(lvalue);
 553         assert(rvalue);
 554         assert(data);
 555
 556         if ((x = log_facility_from_string(rvalue)) < 0)
 557
 558                 /* Second try, let's see if this is a number. */
 559                 if (safe_atoi(rvalue, &x) < 0 || !log_facility_to_string(x)) {
 560                         log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 561                         return -EBADMSG;
 562                 }
 563
 564         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 565
 566         return 0;
 567 }
 568
 569 static int config_parse_level(
 570                 const char *filename,
 571                 unsigned line,
 572                 const char *section,
 573                 const char *lvalue,
 574                 const char *rvalue,
 575                 void *data,
 576                 void *userdata) {
 577
 578
 579         int *o = data, x;
 580
 581         assert(filename);
 582         assert(lvalue);
 583         assert(rvalue);
 584         assert(data);
 585
 586         if ((x = log_level_from_string(rvalue)) < 0)
 587
 588                 /* Second try, let's see if this is a number. */
 589                 if (safe_atoi(rvalue, &x) < 0 || !log_level_to_string(x)) {
 590                         log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 591                         return -EBADMSG;
 592                 }
 593
 594         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 595         return 0;
 596 }
 597
 598 static int config_parse_io_class(
 599                 const char *filename,
 600                 unsigned line,
 601                 const char *section,
 602                 const char *lvalue,
 603                 const char *rvalue,
 604                 void *data,
 605                 void *userdata) {
 606
 607         ExecContext *c = data;
 608         int x;
 609
 610         assert(filename);
 611         assert(lvalue);
 612         assert(rvalue);
 613         assert(data);
 614
 615         if ((x = ioprio_class_from_string(rvalue)) < 0)
 616
 617                 /* Second try, let's see if this is a number. */
 618                 if (safe_atoi(rvalue, &x) < 0 || !ioprio_class_to_string(x)) {
 619                         log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 620                         return -EBADMSG;
 621                 }
 622
 623         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 624         c->ioprio_set = true;
 625
 626         return 0;
 627 }
 628
 629 static int config_parse_io_priority(
 630                 const char *filename,
 631                 unsigned line,
 632                 const char *section,
 633                 const char *lvalue,
 634                 const char *rvalue,
 635                 void *data,
 636                 void *userdata) {
 637
 638         ExecContext *c = data;
 639         int i;
 640
 641         assert(filename);
 642         assert(lvalue);
 643         assert(rvalue);
 644         assert(data);
 645
 646         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 647                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 648                 return -EBADMSG;
 649         }
 650
 651         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 652         c->ioprio_set = true;
 653
 654         return 0;
 655 }
 656
 657 static int config_parse_cpu_sched_policy(
 658                 const char *filename,
 659                 unsigned line,
 660                 const char *section,
 661                 const char *lvalue,
 662                 const char *rvalue,
 663                 void *data,
 664                 void *userdata) {
 665
 666
 667         ExecContext *c = data;
 668         int x;
 669
 670         assert(filename);
 671         assert(lvalue);
 672         assert(rvalue);
 673         assert(data);
 674
 675         if ((x = sched_policy_from_string(rvalue)) < 0)
 676
 677                 /* Second try, let's see if this is a number. */
 678                 if (safe_atoi(rvalue, &x) < 0 || !sched_policy_to_string(x)) {
 679                         log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 680                         return -EBADMSG;
 681                 }
 682
 683         c->cpu_sched_policy = x;
 684         c->cpu_sched_set = true;
 685
 686         return 0;
 687 }
 688
 689 static int config_parse_cpu_sched_prio(
 690                 const char *filename,
 691                 unsigned line,
 692                 const char *section,
 693                 const char *lvalue,
 694                 const char *rvalue,
 695                 void *data,
 696                 void *userdata) {
 697
 698         ExecContext *c = data;
 699         int i;
 700
 701         assert(filename);
 702         assert(lvalue);
 703         assert(rvalue);
 704         assert(data);
 705
 706         /* On Linux RR/FIFO have the same range */
 707         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 708                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 709                 return -EBADMSG;
 710         }
 711
 712         c->cpu_sched_priority = i;
 713         c->cpu_sched_set = true;
 714
 715         return 0;
 716 }
 717
 718 static int config_parse_cpu_affinity(
 719                 const char *filename,
 720                 unsigned line,
 721                 const char *section,
 722                 const char *lvalue,
 723                 const char *rvalue,
 724                 void *data,
 725                 void *userdata) {
 726
 727         ExecContext *c = data;
 728         char *w;
 729         size_t l;
 730         char *state;
 731
 732         assert(filename);
 733         assert(lvalue);
 734         assert(rvalue);
 735         assert(data);
 736
 737         FOREACH_WORD(w, l, rvalue, state) {
 738                 char *t;
 739                 int r;
 740                 unsigned cpu;
 741
 742                 if (!(t = strndup(w, l)))
 743                         return -ENOMEM;
 744
 745                 r = safe_atou(t, &cpu);
 746                 free(t);
 747
 748                 if (r < 0 || cpu >= CPU_SETSIZE) {
 749                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 750                         return -EBADMSG;
 751                 }
 752
 753                 CPU_SET(cpu, &c->cpu_affinity);
 754         }
 755
 756         c->cpu_affinity_set = true;
 757
 758         return 0;
 759 }
 760
 761 static int config_parse_capabilities(
 762                 const char *filename,
 763                 unsigned line,
 764                 const char *section,
 765                 const char *lvalue,
 766                 const char *rvalue,
 767                 void *data,
 768                 void *userdata) {
 769
 770         ExecContext *c = data;
 771         cap_t cap;
 772
 773         assert(filename);
 774         assert(lvalue);
 775         assert(rvalue);
 776         assert(data);
 777
 778         if (!(cap = cap_from_text(rvalue))) {
 779                 if (errno == ENOMEM)
 780                         return -ENOMEM;
 781
 782                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 783                 return -EBADMSG;
 784         }
 785
 786         if (c->capabilities)
 787                 cap_free(c->capabilities);
 788         c->capabilities = cap;
 789
 790         return 0;
 791 }
 792
 793 static int config_parse_secure_bits(
 794                 const char *filename,
 795                 unsigned line,
 796                 const char *section,
 797                 const char *lvalue,
 798                 const char *rvalue,
 799                 void *data,
 800                 void *userdata) {
 801
 802         ExecContext *c = data;
 803         char *w;
 804         size_t l;
 805         char *state;
 806
 807         assert(filename);
 808         assert(lvalue);
 809         assert(rvalue);
 810         assert(data);
 811
 812         FOREACH_WORD(w, l, rvalue, state) {
 813                 if (first_word(w, "keep-caps"))
 814                         c->secure_bits |= SECURE_KEEP_CAPS;
 815                 else if (first_word(w, "keep-caps-locked"))
 816                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 817                 else if (first_word(w, "no-setuid-fixup"))
 818                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 819                 else if (first_word(w, "no-setuid-fixup-locked"))
 820                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 821                 else if (first_word(w, "noroot"))
 822                         c->secure_bits |= SECURE_NOROOT;
 823                 else if (first_word(w, "noroot-locked"))
 824                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 825                 else {
 826                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 827                         return -EBADMSG;
 828                 }
 829         }
 830
 831         return 0;
 832 }
 833
 834 static int config_parse_bounding_set(
 835                 const char *filename,
 836                 unsigned line,
 837                 const char *section,
 838                 const char *lvalue,
 839                 const char *rvalue,
 840                 void *data,
 841                 void *userdata) {
 842
 843         ExecContext *c = data;
 844         char *w;
 845         size_t l;
 846         char *state;
 847
 848         assert(filename);
 849         assert(lvalue);
 850         assert(rvalue);
 851         assert(data);
 852
 853         FOREACH_WORD(w, l, rvalue, state) {
 854                 char *t;
 855                 int r;
 856                 cap_value_t cap;
 857
 858                 if (!(t = strndup(w, l)))
 859                         return -ENOMEM;
 860
 861                 r = cap_from_name(t, &cap);
 862                 free(t);
 863
 864                 if (r < 0) {
 865                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 866                         return -EBADMSG;
 867                 }
 868
 869                 c->capability_bounding_set_drop |= 1 << cap;
 870         }
 871
 872         return 0;
 873 }
 874
 875 static int config_parse_timer_slack_ns(
 876                 const char *filename,
 877                 unsigned line,
 878                 const char *section,
 879                 const char *lvalue,
 880                 const char *rvalue,
 881                 void *data,
 882                 void *userdata) {
 883
 884         ExecContext *c = data;
 885         unsigned long u;
 886         int r;
 887
 888         assert(filename);
 889         assert(lvalue);
 890         assert(rvalue);
 891         assert(data);
 892
 893         if ((r = safe_atolu(rvalue, &u)) < 0) {
 894                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 895                 return r;
 896         }
 897
 898         c->timer_slack_ns = u;
 899
 900         return 0;
 901 }
 902
 903 static int config_parse_limit(
 904                 const char *filename,
 905                 unsigned line,
 906                 const char *section,
 907                 const char *lvalue,
 908                 const char *rvalue,
 909                 void *data,
 910                 void *userdata) {
 911
 912         struct rlimit **rl = data;
 913         unsigned long long u;
 914         int r;
 915
 916         assert(filename);
 917         assert(lvalue);
 918         assert(rvalue);
 919         assert(data);
 920
 921         if ((r = safe_atollu(rvalue, &u)) < 0) {
 922                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 923                 return r;
 924         }
 925
 926         if (!*rl)
 927                 if (!(*rl = new(struct rlimit, 1)))
 928                         return -ENOMEM;
 929
 930         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 931         return 0;
 932 }
 933
 934 static int config_parse_cgroup(
 935                 const char *filename,
 936                 unsigned line,
 937                 const char *section,
 938                 const char *lvalue,
 939                 const char *rvalue,
 940                 void *data,
 941                 void *userdata) {
 942
 943         Unit *u = userdata;
 944         char *w;
 945         size_t l;
 946         char *state;
 947
 948         FOREACH_WORD(w, l, rvalue, state) {
 949                 char *t;
 950                 int r;
 951
 952                 if (!(t = strndup(w, l)))
 953                         return -ENOMEM;
 954
 955                 r = unit_add_cgroup_from_text(u, t);
 956                 free(t);
 957
 958                 if (r < 0)
 959                         return r;
 960         }
 961
 962         return 0;
 963 }
 964
 965 static int config_parse_sysv_priority(
 966                 const char *filename,
 967                 unsigned line,
 968                 const char *section,
 969                 const char *lvalue,
 970                 const char *rvalue,
 971                 void *data,
 972                 void *userdata) {
 973
 974         int *priority = data;
 975         int r, i;
 976
 977         assert(filename);
 978         assert(lvalue);
 979         assert(rvalue);
 980         assert(data);
 981
 982         if ((r = safe_atoi(rvalue, &i)) < 0 || i < 0) {
 983                 log_error("[%s:%u] Failed to parse SysV start priority: %s", filename, line, rvalue);
 984                 return r;
 985         }
 986
 987         *priority = (int) i;
 988         return 0;
 989 }
 990
 991 static int config_parse_kill_mode(
 992                 const char *filename,
 993                 unsigned line,
 994                 const char *section,
 995                 const char *lvalue,
 996                 const char *rvalue,
 997                 void *data,
 998                 void *userdata) {
 999
1000         KillMode *m = data, x;
1001
1002         assert(filename);
1003         assert(lvalue);
1004         assert(rvalue);
1005         assert(data);
1006
1007         if ((x = kill_mode_from_string(rvalue)) < 0) {
1008                 log_error("[%s:%u] Failed to parse kill mode specifier: %s", filename, line, rvalue);
1009                 return -EBADMSG;
1010         }
1011
1012         *m = x;
1013
1014         return 0;
1015 }
1016
1017 #define FOLLOW_MAX 8
1018
1019 static int open_follow(char **filename, FILE **_f, Set *names, char **_id) {
1020         unsigned c = 0;
1021         int fd, r;
1022         FILE *f;
1023         char *id = NULL;
1024
1025         assert(filename);
1026         assert(*filename);
1027         assert(_f);
1028         assert(names);
1029
1030         /* This will update the filename pointer if the loaded file is
1031          * reached by a symlink. The old string will be freed. */
1032
1033         for (;;) {
1034                 char *target, *k, *name;
1035
1036                 if (c++ >= FOLLOW_MAX)
1037                         return -ELOOP;
1038
1039                 path_kill_slashes(*filename);
1040
1041                 /* Add the file name we are currently looking at to
1042                  * the names of this unit */
1043                 name = file_name_from_path(*filename);
1044                 if (!(id = set_get(names, name))) {
1045
1046                         if (!(id = strdup(name)))
1047                                 return -ENOMEM;
1048
1049                         if ((r = set_put(names, id)) < 0) {
1050                                 free(id);
1051                                 return r;
1052                         }
1053                 }
1054
1055                 /* Try to open the file name, but don't if its a symlink */
1056                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
1057                         break;
1058
1059                 if (errno != ELOOP)
1060                         return -errno;
1061
1062                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
1063                 if ((r = readlink_malloc(*filename, &target)) < 0)
1064                         return r;
1065
1066                 k = file_in_same_dir(*filename, target);
1067                 free(target);
1068
1069                 if (!k)
1070                         return -ENOMEM;
1071
1072                 free(*filename);
1073                 *filename = k;
1074         }
1075
1076         if (!(f = fdopen(fd, "r"))) {
1077                 r = -errno;
1078                 assert(close_nointr(fd) == 0);
1079                 return r;
1080         }
1081
1082         *_f = f;
1083         *_id = id;
1084         return 0;
1085 }
1086
1087 static int merge_by_names(Unit **u, Set *names, const char *id) {
1088         char *k;
1089         int r;
1090
1091         assert(u);
1092         assert(*u);
1093         assert(names);
1094
1095         /* Let's try to add in all symlink names we found */
1096         while ((k = set_steal_first(names))) {
1097
1098                 /* First try to merge in the other name into our
1099                  * unit */
1100                 if ((r = unit_merge_by_name(*u, k)) < 0) {
1101                         Unit *other;
1102
1103                         /* Hmm, we couldn't merge the other unit into
1104                          * ours? Then let's try it the other way
1105                          * round */
1106
1107                         other = manager_get_unit((*u)->meta.manager, k);
1108                         free(k);
1109
1110                         if (other)
1111                                 if ((r = unit_merge(other, *u)) >= 0) {
1112                                         *u = other;
1113                                         return merge_by_names(u, names, NULL);
1114                                 }
1115
1116                         return r;
1117                 }
1118
1119                 if (id == k)
1120                         unit_choose_id(*u, id);
1121
1122                 free(k);
1123         }
1124
1125         return 0;
1126 }
1127
1128 static void dump_items(FILE *f, const ConfigItem *items) {
1129         const ConfigItem *i;
1130         const char *prev_section = NULL;
1131         bool not_first = false;
1132
1133         struct {
1134                 ConfigParserCallback callback;
1135                 const char *rvalue;
1136         } table[] = {
1137                 { config_parse_int,              "INTEGER" },
1138                 { config_parse_unsigned,         "UNSIGNED" },
1139                 { config_parse_size,             "SIZE" },
1140                 { config_parse_bool,             "BOOLEAN" },
1141                 { config_parse_string,           "STRING" },
1142                 { config_parse_path,             "PATH" },
1143                 { config_parse_strv,             "STRING [...]" },
1144                 { config_parse_nice,             "NICE" },
1145                 { config_parse_oom_adjust,       "OOMADJUST" },
1146                 { config_parse_io_class,         "IOCLASS" },
1147                 { config_parse_io_priority,      "IOPRIORITY" },
1148                 { config_parse_cpu_sched_policy, "CPUSCHEDPOLICY" },
1149                 { config_parse_cpu_sched_prio,   "CPUSCHEDPRIO" },
1150                 { config_parse_cpu_affinity,     "CPUAFFINITY" },
1151                 { config_parse_mode,             "MODE" },
1152                 { config_parse_output,           "OUTPUT" },
1153                 { config_parse_input,            "INPUT" },
1154                 { config_parse_facility,         "FACILITY" },
1155                 { config_parse_level,            "LEVEL" },
1156                 { config_parse_capabilities,     "CAPABILITIES" },
1157                 { config_parse_secure_bits,      "SECUREBITS" },
1158                 { config_parse_bounding_set,     "BOUNDINGSET" },
1159                 { config_parse_timer_slack_ns,   "TIMERSLACK" },
1160                 { config_parse_limit,            "LIMIT" },
1161                 { config_parse_cgroup,           "CGROUP [...]" },
1162                 { config_parse_deps,             "UNIT [...]" },
1163                 { config_parse_names,            "UNIT [...]" },
1164                 { config_parse_exec,             "PATH [ARGUMENT [...]]" },
1165                 { config_parse_service_type,     "SERVICETYPE" },
1166                 { config_parse_service_restart,  "SERVICERESTART" },
1167                 { config_parse_sysv_priority,    "SYSVPRIORITY" },
1168                 { config_parse_kill_mode,        "KILLMODE" },
1169                 { config_parse_listen,           "SOCKET [...]" },
1170                 { config_parse_socket_bind,      "SOCKETBIND" },
1171                 { config_parse_bindtodevice,     "NETWORKINTERFACE" }
1172         };
1173
1174         assert(f);
1175         assert(items);
1176
1177         for (i = items; i->lvalue; i++) {
1178                 unsigned j;
1179                 const char *rvalue = "OTHER";
1180
1181                 if (!streq_ptr(i->section, prev_section)) {
1182                         if (!not_first)
1183                                 not_first = true;
1184                         else
1185                                 fputc('\n', f);
1186
1187                         fprintf(f, "[%s]\n", i->section);
1188                         prev_section = i->section;
1189                 }
1190
1191                 for (j = 0; j < ELEMENTSOF(table); j++)
1192                         if (i->parse == table[j].callback) {
1193                                 rvalue = table[j].rvalue;
1194                                 break;
1195                         }
1196
1197                 fprintf(f, "%s=%s\n", i->lvalue, rvalue);
1198         }
1199 }
1200
1201 static int load_from_path(Unit *u, const char *path) {
1202
1203         static const char* const section_table[_UNIT_TYPE_MAX] = {
1204                 [UNIT_SERVICE]   = "Service",
1205                 [UNIT_TIMER]     = "Timer",
1206                 [UNIT_SOCKET]    = "Socket",
1207                 [UNIT_TARGET]    = "Target",
1208                 [UNIT_DEVICE]    = "Device",
1209                 [UNIT_MOUNT]     = "Mount",
1210                 [UNIT_AUTOMOUNT] = "Automount",
1211                 [UNIT_SNAPSHOT]  = "Snapshot"
1212         };
1213
1214 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1215                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1216                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1217                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1218                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1219                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1220                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1221                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1222                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1223                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1224                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1225                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1226                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1227                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1228                 { "UMask",                  config_parse_mode,            &(context).umask,                                section   }, \
1229                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1230                 { "StandardInput",          config_parse_input,           &(context).std_input,                            section   }, \
1231                 { "StandardOutput",         config_parse_output,          &(context).std_output,                           section   }, \
1232                 { "StandardError",          config_parse_output,          &(context).std_output,                           section   }, \
1233                 { "TTYPath",                config_parse_path,            &(context).tty_path,                             section   }, \
1234                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1235                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1236                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1237                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1238                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1239                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1240                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1241                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1242                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1243                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1244                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1245                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1246                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1247                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1248                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1249                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1250                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1251                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1252                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1253                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1254                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1255                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1256                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }, \
1257                 { "ControlGroup",           config_parse_cgroup,          u,                                               section   }
1258
1259         const ConfigItem items[] = {
1260                 { "Names",                  config_parse_names,           u,                                               "Meta"    },
1261                 { "Description",            config_parse_string,          &u->meta.description,                            "Meta"    },
1262                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Meta"    },
1263                 { "SoftRequires",           config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUIRES),                 "Meta"    },
1264                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Meta"    },
1265                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Meta"    },
1266                 { "SoftRequisite",          config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUISITE),                "Meta"    },
1267                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Meta"    },
1268                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Meta"    },
1269                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Meta"    },
1270                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Meta"    },
1271                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Meta"    },
1272
1273                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                            "Service" },
1274                 { "ExecStartPre",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_PRE,  "Service" },
1275                 { "ExecStart",              config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START,      "Service" },
1276                 { "ExecStartPost",          config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_POST, "Service" },
1277                 { "ExecReload",             config_parse_exec,            u->service.exec_command+SERVICE_EXEC_RELOAD,     "Service" },
1278                 { "ExecStop",               config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP,       "Service" },
1279                 { "ExecStopPost",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP_POST,  "Service" },
1280                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                        "Service" },
1281                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                        "Service" },
1282                 { "Type",                   config_parse_service_type,    &u->service,                                     "Service" },
1283                 { "Restart",                config_parse_service_restart, &u->service,                                     "Service" },
1284                 { "PermissionsStartOnly",   config_parse_bool,            &u->service.permissions_start_only,              "Service" },
1285                 { "RootDirectoryStartOnly", config_parse_bool,            &u->service.root_directory_start_only,           "Service" },
1286                 { "ValidNoProcess",         config_parse_bool,            &u->service.valid_no_process,                    "Service" },
1287                 { "SysVStartPriority",      config_parse_sysv_priority,   &u->service.sysv_start_priority,                 "Service" },
1288                 { "KillMode",               config_parse_kill_mode,       &u->service.kill_mode,                           "Service" },
1289                 { "NonBlocking",            config_parse_bool,            &u->service.exec_context.non_blocking,           "Service" },
1290                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1291
1292                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1293                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1294                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1295                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1296                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1297                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1298                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1299                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1300                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1301                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1302                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1303                 { "TimeoutSec",             config_parse_usec,            &u->socket.timeout_usec,                         "Socket"  },
1304                 { "DirectoryMode",          config_parse_mode,            &u->socket.directory_mode,                       "Socket"  },
1305                 { "SocketMode",             config_parse_mode,            &u->socket.socket_mode,                          "Socket"  },
1306                 { "KillMode",               config_parse_kill_mode,       &u->socket.kill_mode,                            "Socket"  },
1307                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1308
1309                 { "What",                   config_parse_string,          &u->mount.parameters_fragment.what,              "Mount"   },
1310                 { "Where",                  config_parse_path,            &u->mount.where,                                 "Mount"   },
1311                 { "Options",                config_parse_string,          &u->mount.parameters_fragment.options,           "Mount"   },
1312                 { "Type",                   config_parse_string,          &u->mount.parameters_fragment.fstype,            "Mount"   },
1313                 { "TimeoutSec",             config_parse_usec,            &u->mount.timeout_usec,                          "Mount"   },
1314                 { "KillMode",               config_parse_kill_mode,       &u->mount.kill_mode,                             "Mount"   },
1315                 EXEC_CONTEXT_CONFIG_ITEMS(u->mount.exec_context, "Mount"),
1316
1317                 { NULL, NULL, NULL, NULL }
1318         };
1319
1320 #undef EXEC_CONTEXT_CONFIG_ITEMS
1321
1322         const char *sections[3];
1323         char *k;
1324         int r;
1325         Set *symlink_names;
1326         FILE *f = NULL;
1327         char *filename = NULL, *id = NULL;
1328         Unit *merged;
1329
1330         if (!u) {
1331                 /* Dirty dirty hack. */
1332                 dump_items((FILE*) path, items);
1333                 return 0;
1334         }
1335
1336         assert(u);
1337         assert(path);
1338
1339         sections[0] = "Meta";
1340         sections[1] = section_table[u->meta.type];
1341         sections[2] = NULL;
1342
1343         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1344                 return -ENOMEM;
1345
1346         if (path_is_absolute(path)) {
1347
1348                 if (!(filename = strdup(path))) {
1349                         r = -ENOMEM;
1350                         goto finish;
1351                 }
1352
1353                 if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1354                         free(filename);
1355                         filename = NULL;
1356
1357                         if (r != -ENOENT)
1358                                 goto finish;
1359                 }
1360
1361         } else  {
1362                 char **p;
1363
1364                 STRV_FOREACH(p, u->meta.manager->unit_path) {
1365
1366                         /* Instead of opening the path right away, we manually
1367                          * follow all symlinks and add their name to our unit
1368                          * name set while doing so */
1369                         if (!(filename = path_make_absolute(path, *p))) {
1370                                 r = -ENOMEM;
1371                                 goto finish;
1372                         }
1373
1374                         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1375                                 char *sn;
1376
1377                                 free(filename);
1378                                 filename = NULL;
1379
1380                                 if (r != -ENOENT)
1381                                         goto finish;
1382
1383                                 /* Empty the symlink names for the next run */
1384                                 while ((sn = set_steal_first(symlink_names)))
1385                                         free(sn);
1386
1387                                 continue;
1388                         }
1389
1390                         break;
1391                 }
1392         }
1393
1394         if (!filename) {
1395                 r = 0;
1396                 goto finish;
1397         }
1398
1399         merged = u;
1400         if ((r = merge_by_names(&merged, symlink_names, id)) < 0)
1401                 goto finish;
1402
1403         if (merged != u) {
1404                 u->meta.load_state = UNIT_MERGED;
1405                 r = 0;
1406                 goto finish;
1407         }
1408
1409         /* Now, parse the file contents */
1410         if ((r = config_parse(filename, f, sections, items, u)) < 0)
1411                 goto finish;
1412
1413         free(u->meta.fragment_path);
1414         u->meta.fragment_path = filename;
1415         filename = NULL;
1416
1417         u->meta.load_state = UNIT_LOADED;
1418         r = 0;
1419
1420 finish:
1421         while ((k = set_steal_first(symlink_names)))
1422                 free(k);
1423
1424         set_free(symlink_names);
1425         free(filename);
1426
1427         if (f)
1428                 fclose(f);
1429
1430         return r;
1431 }
1432
1433 int unit_load_fragment(Unit *u) {
1434         int r;
1435
1436         assert(u);
1437
1438         if (u->meta.fragment_path) {
1439
1440                 if ((r = load_from_path(u, u->meta.fragment_path)) < 0)
1441                         return r;
1442
1443         } else {
1444                 Iterator i;
1445                 const char *t;
1446
1447                 /* Try to find the unit under its id */
1448                 if ((t = unit_id(u)))
1449                         if ((r = load_from_path(u, t)) < 0)
1450                                 return r;
1451
1452                 /* Try to find an alias we can load this with */
1453                 if (u->meta.load_state == UNIT_STUB)
1454                         SET_FOREACH(t, u->meta.names, i) {
1455
1456                                 if (unit_id(u) == t)
1457                                         continue;
1458
1459                                 if ((r = load_from_path(u, t)) < 0)
1460                                         return r;
1461
1462                                 if (u->meta.load_state != UNIT_STUB)
1463                                         break;
1464                         }
1465         }
1466
1467         return 0;
1468 }
1469
1470 void unit_dump_config_items(FILE *f) {
1471         /* OK, this wins a prize for extreme ugliness. */
1472
1473         load_from_path(NULL, (const void*) f);
1474 }