src/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 #include <sys/mount.h>
  31 #include <linux/fs.h>
  32
  33 #include "unit.h"
  34 #include "strv.h"
  35 #include "conf-parser.h"
  36 #include "load-fragment.h"
  37 #include "log.h"
  38 #include "ioprio.h"
  39 #include "securebits.h"
  40 #include "missing.h"
  41 #include "unit-name.h"
  42
  43 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
  44         static int function(                                            \
  45                         const char *filename,                           \
  46                         unsigned line,                                  \
  47                         const char *section,                            \
  48                         const char *lvalue,                             \
  49                         const char *rvalue,                             \
  50                         void *data,                                     \
  51                         void *userdata) {                               \
  52                                                                         \
  53                 type *i = data, x;                                      \
  54                                                                         \
  55                 assert(filename);                                       \
  56                 assert(lvalue);                                         \
  57                 assert(rvalue);                                         \
  58                 assert(data);                                           \
  59                                                                         \
  60                 if ((x = name##_from_string(rvalue)) < 0) {             \
  61                         log_error("[%s:%u] " msg ": %s", filename, line, rvalue); \
  62                         return -EBADMSG;                                \
  63                 }                                                       \
  64                                                                         \
  65                 *i = x;                                                 \
  66                                                                         \
  67                 return 0;                                               \
  68         }
  69
  70 static int config_parse_deps(
  71                 const char *filename,
  72                 unsigned line,
  73                 const char *section,
  74                 const char *lvalue,
  75                 const char *rvalue,
  76                 void *data,
  77                 void *userdata) {
  78
  79         UnitDependency d = PTR_TO_UINT(data);
  80         Unit *u = userdata;
  81         char *w;
  82         size_t l;
  83         char *state;
  84
  85         assert(filename);
  86         assert(lvalue);
  87         assert(rvalue);
  88
  89         FOREACH_WORD(w, l, rvalue, state) {
  90                 char *t, *k;
  91                 int r;
  92
  93                 if (!(t = strndup(w, l)))
  94                         return -ENOMEM;
  95
  96                 k = unit_name_printf(u, t);
  97                 free(t);
  98
  99                 if (!k)
 100                         return -ENOMEM;
 101
 102                 r = unit_add_dependency_by_name(u, d, k, NULL, true);
 103                 free(k);
 104
 105                 if (r < 0)
 106                         return r;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static int config_parse_names(
 113                 const char *filename,
 114                 unsigned line,
 115                 const char *section,
 116                 const char *lvalue,
 117                 const char *rvalue,
 118                 void *data,
 119                 void *userdata) {
 120
 121         Unit *u = userdata;
 122         char *w;
 123         size_t l;
 124         char *state;
 125
 126         assert(filename);
 127         assert(lvalue);
 128         assert(rvalue);
 129         assert(data);
 130
 131         FOREACH_WORD(w, l, rvalue, state) {
 132                 char *t, *k;
 133                 int r;
 134
 135                 if (!(t = strndup(w, l)))
 136                         return -ENOMEM;
 137
 138                 k = unit_name_printf(u, t);
 139                 free(t);
 140
 141                 if (!k)
 142                         return -ENOMEM;
 143
 144                 r = unit_merge_by_name(u, k);
 145                 free(k);
 146
 147                 if (r < 0)
 148                         return r;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int config_parse_description(
 155                 const char *filename,
 156                 unsigned line,
 157                 const char *section,
 158                 const char *lvalue,
 159                 const char *rvalue,
 160                 void *data,
 161                 void *userdata) {
 162
 163         Unit *u = userdata;
 164         char *k;
 165
 166         assert(filename);
 167         assert(lvalue);
 168         assert(rvalue);
 169         assert(data);
 170
 171         if (!(k = unit_full_printf(u, rvalue)))
 172                 return -ENOMEM;
 173
 174         free(u->meta.description);
 175
 176         if (*k)
 177                 u->meta.description = k;
 178         else {
 179                 free(k);
 180                 u->meta.description = NULL;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int config_parse_listen(
 187                 const char *filename,
 188                 unsigned line,
 189                 const char *section,
 190                 const char *lvalue,
 191                 const char *rvalue,
 192                 void *data,
 193                 void *userdata) {
 194
 195         int r;
 196         SocketPort *p;
 197         Socket *s;
 198
 199         assert(filename);
 200         assert(lvalue);
 201         assert(rvalue);
 202         assert(data);
 203
 204         s = (Socket*) data;
 205
 206         if (!(p = new0(SocketPort, 1)))
 207                 return -ENOMEM;
 208
 209         if (streq(lvalue, "ListenFIFO")) {
 210                 p->type = SOCKET_FIFO;
 211
 212                 if (!(p->path = strdup(rvalue))) {
 213                         free(p);
 214                         return -ENOMEM;
 215                 }
 216         } else {
 217                 p->type = SOCKET_SOCKET;
 218
 219                 if ((r = socket_address_parse(&p->address, rvalue)) < 0) {
 220                         log_error("[%s:%u] Failed to parse address value: %s", filename, line, rvalue);
 221                         free(p);
 222                         return r;
 223                 }
 224
 225                 if (streq(lvalue, "ListenStream"))
 226                         p->address.type = SOCK_STREAM;
 227                 else if (streq(lvalue, "ListenDatagram"))
 228                         p->address.type = SOCK_DGRAM;
 229                 else {
 230                         assert(streq(lvalue, "ListenSequentialPacket"));
 231                         p->address.type = SOCK_SEQPACKET;
 232                 }
 233
 234                 if (socket_address_family(&p->address) != AF_LOCAL && p->address.type == SOCK_SEQPACKET) {
 235                         free(p);
 236                         return -EPROTONOSUPPORT;
 237                 }
 238         }
 239
 240         p->fd = -1;
 241         LIST_PREPEND(SocketPort, port, s->ports, p);
 242
 243         return 0;
 244 }
 245
 246 static int config_parse_socket_bind(
 247                 const char *filename,
 248                 unsigned line,
 249                 const char *section,
 250                 const char *lvalue,
 251                 const char *rvalue,
 252                 void *data,
 253                 void *userdata) {
 254
 255         Socket *s;
 256         SocketAddressBindIPv6Only b;
 257
 258         assert(filename);
 259         assert(lvalue);
 260         assert(rvalue);
 261         assert(data);
 262
 263         s = (Socket*) data;
 264
 265         if ((b = socket_address_bind_ipv6_only_from_string(rvalue)) < 0) {
 266                 int r;
 267
 268                 if ((r = parse_boolean(rvalue)) < 0) {
 269                         log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 270                         return -EBADMSG;
 271                 }
 272
 273                 s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 274         } else
 275                 s->bind_ipv6_only = b;
 276
 277         return 0;
 278 }
 279
 280 static int config_parse_nice(
 281                 const char *filename,
 282                 unsigned line,
 283                 const char *section,
 284                 const char *lvalue,
 285                 const char *rvalue,
 286                 void *data,
 287                 void *userdata) {
 288
 289         ExecContext *c = data;
 290         int priority, r;
 291
 292         assert(filename);
 293         assert(lvalue);
 294         assert(rvalue);
 295         assert(data);
 296
 297         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 298                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 299                 return r;
 300         }
 301
 302         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 303                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 304                 return -ERANGE;
 305         }
 306
 307         c->nice = priority;
 308         c->nice_set = false;
 309
 310         return 0;
 311 }
 312
 313 static int config_parse_oom_adjust(
 314                 const char *filename,
 315                 unsigned line,
 316                 const char *section,
 317                 const char *lvalue,
 318                 const char *rvalue,
 319                 void *data,
 320                 void *userdata) {
 321
 322         ExecContext *c = data;
 323         int oa, r;
 324
 325         assert(filename);
 326         assert(lvalue);
 327         assert(rvalue);
 328         assert(data);
 329
 330         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 331                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 332                 return r;
 333         }
 334
 335         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 336                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 337                 return -ERANGE;
 338         }
 339
 340         c->oom_adjust = oa;
 341         c->oom_adjust_set = true;
 342
 343         return 0;
 344 }
 345
 346 static int config_parse_mode(
 347                 const char *filename,
 348                 unsigned line,
 349                 const char *section,
 350                 const char *lvalue,
 351                 const char *rvalue,
 352                 void *data,
 353                 void *userdata) {
 354
 355         mode_t *m = data;
 356         long l;
 357         char *x = NULL;
 358
 359         assert(filename);
 360         assert(lvalue);
 361         assert(rvalue);
 362         assert(data);
 363
 364         errno = 0;
 365         l = strtol(rvalue, &x, 8);
 366         if (!x || *x || errno) {
 367                 log_error("[%s:%u] Failed to parse mode value: %s", filename, line, rvalue);
 368                 return errno ? -errno : -EINVAL;
 369         }
 370
 371         if (l < 0000 || l > 07777) {
 372                 log_error("[%s:%u] mode value out of range: %s", filename, line, rvalue);
 373                 return -ERANGE;
 374         }
 375
 376         *m = (mode_t) l;
 377         return 0;
 378 }
 379
 380 static int config_parse_exec(
 381                 const char *filename,
 382                 unsigned line,
 383                 const char *section,
 384                 const char *lvalue,
 385                 const char *rvalue,
 386                 void *data,
 387                 void *userdata) {
 388
 389         ExecCommand **e = data, *nce = NULL;
 390         char **n;
 391         char *w;
 392         unsigned k;
 393         size_t l;
 394         char *state, *path = NULL;
 395         bool honour_argv0, write_to_path;
 396
 397         assert(filename);
 398         assert(lvalue);
 399         assert(rvalue);
 400         assert(data);
 401
 402         /* We accept an absolute path as first argument, or
 403          * alternatively an absolute prefixed with @ to allow
 404          * overriding of argv[0]. */
 405
 406         honour_argv0 = rvalue[0] == '@';
 407
 408         if (rvalue[honour_argv0 ? 1 : 0] != '/') {
 409                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 410                 return -EINVAL;
 411         }
 412
 413         k = 0;
 414         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 415                 k++;
 416
 417         if (!(n = new(char*, k + (honour_argv0 ? 0 : 1))))
 418                 return -ENOMEM;
 419
 420         k = 0;
 421         write_to_path = honour_argv0;
 422         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 423                 if (write_to_path) {
 424                         if (!(path = strndup(w+1, l-1)))
 425                                 goto fail;
 426                         write_to_path = false;
 427                 } else {
 428                         if (!(n[k++] = strndup(w, l)))
 429                                 goto fail;
 430                 }
 431         }
 432
 433         n[k] = NULL;
 434
 435         if (!n[0]) {
 436                 log_error("[%s:%u] Invalid command line: %s", filename, line, rvalue);
 437                 strv_free(n);
 438                 return -EINVAL;
 439         }
 440
 441         if (!path)
 442                 if (!(path = strdup(n[0])))
 443                         goto fail;
 444
 445         assert(path_is_absolute(path));
 446
 447         if (!(nce = new0(ExecCommand, 1)))
 448                 goto fail;
 449
 450         nce->argv = n;
 451         nce->path = path;
 452
 453         exec_command_append_list(e, nce);
 454
 455         return 0;
 456
 457 fail:
 458         n[k] = NULL;
 459         strv_free(n);
 460         free(path);
 461         free(nce);
 462
 463         return -ENOMEM;
 464 }
 465
 466 static int config_parse_usec(
 467                 const char *filename,
 468                 unsigned line,
 469                 const char *section,
 470                 const char *lvalue,
 471                 const char *rvalue,
 472                 void *data,
 473                 void *userdata) {
 474
 475         usec_t *usec = data;
 476         int r;
 477
 478         assert(filename);
 479         assert(lvalue);
 480         assert(rvalue);
 481         assert(data);
 482
 483         if ((r = parse_usec(rvalue, usec)) < 0) {
 484                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 485                 return r;
 486         }
 487
 488         return 0;
 489 }
 490
 491 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_type, service_type, ServiceType, "Failed to parse service type");
 492 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_restart, service_restart, ServiceRestart, "Failed to parse service restart specifier");
 493
 494 static int config_parse_bindtodevice(
 495                 const char *filename,
 496                 unsigned line,
 497                 const char *section,
 498                 const char *lvalue,
 499                 const char *rvalue,
 500                 void *data,
 501                 void *userdata) {
 502
 503         Socket *s = data;
 504         char *n;
 505
 506         assert(filename);
 507         assert(lvalue);
 508         assert(rvalue);
 509         assert(data);
 510
 511         if (rvalue[0] && !streq(rvalue, "*")) {
 512                 if (!(n = strdup(rvalue)))
 513                         return -ENOMEM;
 514         } else
 515                 n = NULL;
 516
 517         free(s->bind_to_device);
 518         s->bind_to_device = n;
 519
 520         return 0;
 521 }
 522
 523 DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
 524 DEFINE_CONFIG_PARSE_ENUM(config_parse_input, exec_input, ExecInput, "Failed to parse input specifier");
 525
 526 static int config_parse_facility(
 527                 const char *filename,
 528                 unsigned line,
 529                 const char *section,
 530                 const char *lvalue,
 531                 const char *rvalue,
 532                 void *data,
 533                 void *userdata) {
 534
 535
 536         int *o = data, x;
 537
 538         assert(filename);
 539         assert(lvalue);
 540         assert(rvalue);
 541         assert(data);
 542
 543         if ((x = log_facility_from_string(rvalue)) < 0) {
 544                 log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 545                 return -EBADMSG;
 546         }
 547
 548         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 549
 550         return 0;
 551 }
 552
 553 static int config_parse_level(
 554                 const char *filename,
 555                 unsigned line,
 556                 const char *section,
 557                 const char *lvalue,
 558                 const char *rvalue,
 559                 void *data,
 560                 void *userdata) {
 561
 562
 563         int *o = data, x;
 564
 565         assert(filename);
 566         assert(lvalue);
 567         assert(rvalue);
 568         assert(data);
 569
 570         if ((x = log_level_from_string(rvalue)) < 0) {
 571                 log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 572                 return -EBADMSG;
 573         }
 574
 575         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 576         return 0;
 577 }
 578
 579 static int config_parse_io_class(
 580                 const char *filename,
 581                 unsigned line,
 582                 const char *section,
 583                 const char *lvalue,
 584                 const char *rvalue,
 585                 void *data,
 586                 void *userdata) {
 587
 588         ExecContext *c = data;
 589         int x;
 590
 591         assert(filename);
 592         assert(lvalue);
 593         assert(rvalue);
 594         assert(data);
 595
 596         if ((x = ioprio_class_from_string(rvalue)) < 0) {
 597                 log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 598                 return -EBADMSG;
 599         }
 600
 601         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 602         c->ioprio_set = true;
 603
 604         return 0;
 605 }
 606
 607 static int config_parse_io_priority(
 608                 const char *filename,
 609                 unsigned line,
 610                 const char *section,
 611                 const char *lvalue,
 612                 const char *rvalue,
 613                 void *data,
 614                 void *userdata) {
 615
 616         ExecContext *c = data;
 617         int i;
 618
 619         assert(filename);
 620         assert(lvalue);
 621         assert(rvalue);
 622         assert(data);
 623
 624         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 625                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 626                 return -EBADMSG;
 627         }
 628
 629         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 630         c->ioprio_set = true;
 631
 632         return 0;
 633 }
 634
 635 static int config_parse_cpu_sched_policy(
 636                 const char *filename,
 637                 unsigned line,
 638                 const char *section,
 639                 const char *lvalue,
 640                 const char *rvalue,
 641                 void *data,
 642                 void *userdata) {
 643
 644
 645         ExecContext *c = data;
 646         int x;
 647
 648         assert(filename);
 649         assert(lvalue);
 650         assert(rvalue);
 651         assert(data);
 652
 653         if ((x = sched_policy_from_string(rvalue)) < 0) {
 654                 log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 655                 return -EBADMSG;
 656         }
 657
 658         c->cpu_sched_policy = x;
 659         c->cpu_sched_set = true;
 660
 661         return 0;
 662 }
 663
 664 static int config_parse_cpu_sched_prio(
 665                 const char *filename,
 666                 unsigned line,
 667                 const char *section,
 668                 const char *lvalue,
 669                 const char *rvalue,
 670                 void *data,
 671                 void *userdata) {
 672
 673         ExecContext *c = data;
 674         int i;
 675
 676         assert(filename);
 677         assert(lvalue);
 678         assert(rvalue);
 679         assert(data);
 680
 681         /* On Linux RR/FIFO have the same range */
 682         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 683                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 684                 return -EBADMSG;
 685         }
 686
 687         c->cpu_sched_priority = i;
 688         c->cpu_sched_set = true;
 689
 690         return 0;
 691 }
 692
 693 static int config_parse_cpu_affinity(
 694                 const char *filename,
 695                 unsigned line,
 696                 const char *section,
 697                 const char *lvalue,
 698                 const char *rvalue,
 699                 void *data,
 700                 void *userdata) {
 701
 702         ExecContext *c = data;
 703         char *w;
 704         size_t l;
 705         char *state;
 706
 707         assert(filename);
 708         assert(lvalue);
 709         assert(rvalue);
 710         assert(data);
 711
 712         FOREACH_WORD(w, l, rvalue, state) {
 713                 char *t;
 714                 int r;
 715                 unsigned cpu;
 716
 717                 if (!(t = strndup(w, l)))
 718                         return -ENOMEM;
 719
 720                 r = safe_atou(t, &cpu);
 721                 free(t);
 722
 723                 if (r < 0 || cpu >= CPU_SETSIZE) {
 724                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 725                         return -EBADMSG;
 726                 }
 727
 728                 CPU_SET(cpu, &c->cpu_affinity);
 729         }
 730
 731         c->cpu_affinity_set = true;
 732
 733         return 0;
 734 }
 735
 736 static int config_parse_capabilities(
 737                 const char *filename,
 738                 unsigned line,
 739                 const char *section,
 740                 const char *lvalue,
 741                 const char *rvalue,
 742                 void *data,
 743                 void *userdata) {
 744
 745         ExecContext *c = data;
 746         cap_t cap;
 747
 748         assert(filename);
 749         assert(lvalue);
 750         assert(rvalue);
 751         assert(data);
 752
 753         if (!(cap = cap_from_text(rvalue))) {
 754                 if (errno == ENOMEM)
 755                         return -ENOMEM;
 756
 757                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 758                 return -EBADMSG;
 759         }
 760
 761         if (c->capabilities)
 762                 cap_free(c->capabilities);
 763         c->capabilities = cap;
 764
 765         return 0;
 766 }
 767
 768 static int config_parse_secure_bits(
 769                 const char *filename,
 770                 unsigned line,
 771                 const char *section,
 772                 const char *lvalue,
 773                 const char *rvalue,
 774                 void *data,
 775                 void *userdata) {
 776
 777         ExecContext *c = data;
 778         char *w;
 779         size_t l;
 780         char *state;
 781
 782         assert(filename);
 783         assert(lvalue);
 784         assert(rvalue);
 785         assert(data);
 786
 787         FOREACH_WORD(w, l, rvalue, state) {
 788                 if (first_word(w, "keep-caps"))
 789                         c->secure_bits |= SECURE_KEEP_CAPS;
 790                 else if (first_word(w, "keep-caps-locked"))
 791                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 792                 else if (first_word(w, "no-setuid-fixup"))
 793                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 794                 else if (first_word(w, "no-setuid-fixup-locked"))
 795                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 796                 else if (first_word(w, "noroot"))
 797                         c->secure_bits |= SECURE_NOROOT;
 798                 else if (first_word(w, "noroot-locked"))
 799                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 800                 else {
 801                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 802                         return -EBADMSG;
 803                 }
 804         }
 805
 806         return 0;
 807 }
 808
 809 static int config_parse_bounding_set(
 810                 const char *filename,
 811                 unsigned line,
 812                 const char *section,
 813                 const char *lvalue,
 814                 const char *rvalue,
 815                 void *data,
 816                 void *userdata) {
 817
 818         ExecContext *c = data;
 819         char *w;
 820         size_t l;
 821         char *state;
 822
 823         assert(filename);
 824         assert(lvalue);
 825         assert(rvalue);
 826         assert(data);
 827
 828         FOREACH_WORD(w, l, rvalue, state) {
 829                 char *t;
 830                 int r;
 831                 cap_value_t cap;
 832
 833                 if (!(t = strndup(w, l)))
 834                         return -ENOMEM;
 835
 836                 r = cap_from_name(t, &cap);
 837                 free(t);
 838
 839                 if (r < 0) {
 840                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 841                         return -EBADMSG;
 842                 }
 843
 844                 c->capability_bounding_set_drop |= 1 << cap;
 845         }
 846
 847         return 0;
 848 }
 849
 850 static int config_parse_timer_slack_ns(
 851                 const char *filename,
 852                 unsigned line,
 853                 const char *section,
 854                 const char *lvalue,
 855                 const char *rvalue,
 856                 void *data,
 857                 void *userdata) {
 858
 859         ExecContext *c = data;
 860         unsigned long u;
 861         int r;
 862
 863         assert(filename);
 864         assert(lvalue);
 865         assert(rvalue);
 866         assert(data);
 867
 868         if ((r = safe_atolu(rvalue, &u)) < 0) {
 869                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 870                 return r;
 871         }
 872
 873         c->timer_slack_ns = u;
 874
 875         return 0;
 876 }
 877
 878 static int config_parse_limit(
 879                 const char *filename,
 880                 unsigned line,
 881                 const char *section,
 882                 const char *lvalue,
 883                 const char *rvalue,
 884                 void *data,
 885                 void *userdata) {
 886
 887         struct rlimit **rl = data;
 888         unsigned long long u;
 889         int r;
 890
 891         assert(filename);
 892         assert(lvalue);
 893         assert(rvalue);
 894         assert(data);
 895
 896         if ((r = safe_atollu(rvalue, &u)) < 0) {
 897                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 898                 return r;
 899         }
 900
 901         if (!*rl)
 902                 if (!(*rl = new(struct rlimit, 1)))
 903                         return -ENOMEM;
 904
 905         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 906         return 0;
 907 }
 908
 909 static int config_parse_cgroup(
 910                 const char *filename,
 911                 unsigned line,
 912                 const char *section,
 913                 const char *lvalue,
 914                 const char *rvalue,
 915                 void *data,
 916                 void *userdata) {
 917
 918         Unit *u = userdata;
 919         char *w;
 920         size_t l;
 921         char *state;
 922
 923         FOREACH_WORD(w, l, rvalue, state) {
 924                 char *t;
 925                 int r;
 926
 927                 if (!(t = strndup(w, l)))
 928                         return -ENOMEM;
 929
 930                 r = unit_add_cgroup_from_text(u, t);
 931                 free(t);
 932
 933                 if (r < 0)
 934                         return r;
 935         }
 936
 937         return 0;
 938 }
 939
 940 static int config_parse_sysv_priority(
 941                 const char *filename,
 942                 unsigned line,
 943                 const char *section,
 944                 const char *lvalue,
 945                 const char *rvalue,
 946                 void *data,
 947                 void *userdata) {
 948
 949         int *priority = data;
 950         int r, i;
 951
 952         assert(filename);
 953         assert(lvalue);
 954         assert(rvalue);
 955         assert(data);
 956
 957         if ((r = safe_atoi(rvalue, &i)) < 0 || i < 0) {
 958                 log_error("[%s:%u] Failed to parse SysV start priority: %s", filename, line, rvalue);
 959                 return r;
 960         }
 961
 962         *priority = (int) i;
 963         return 0;
 964 }
 965
 966 DEFINE_CONFIG_PARSE_ENUM(config_parse_kill_mode, kill_mode, KillMode, "Failed to parse kill mode");
 967
 968 static int config_parse_mount_flags(
 969                 const char *filename,
 970                 unsigned line,
 971                 const char *section,
 972                 const char *lvalue,
 973                 const char *rvalue,
 974                 void *data,
 975                 void *userdata) {
 976
 977         ExecContext *c = data;
 978         char *w;
 979         size_t l;
 980         char *state;
 981         unsigned long flags = 0;
 982
 983         assert(filename);
 984         assert(lvalue);
 985         assert(rvalue);
 986         assert(data);
 987
 988         FOREACH_WORD(w, l, rvalue, state) {
 989                 if (strncmp(w, "shared", l) == 0)
 990                         flags |= MS_SHARED;
 991                 else if (strncmp(w, "slave", l) == 0)
 992                         flags |= MS_SLAVE;
 993                 else if (strncmp(w, "private", l) == 0)
 994                         flags |= MS_PRIVATE;
 995                 else {
 996                         log_error("[%s:%u] Failed to parse mount flags: %s", filename, line, rvalue);
 997                         return -EINVAL;
 998                 }
 999         }
1000
1001         c->mount_flags = flags;
1002         return 0;
1003 }
1004
1005 #define FOLLOW_MAX 8
1006
1007 static int open_follow(char **filename, FILE **_f, Set *names, char **_final) {
1008         unsigned c = 0;
1009         int fd, r;
1010         FILE *f;
1011         char *id = NULL;
1012
1013         assert(filename);
1014         assert(*filename);
1015         assert(_f);
1016         assert(names);
1017
1018         /* This will update the filename pointer if the loaded file is
1019          * reached by a symlink. The old string will be freed. */
1020
1021         for (;;) {
1022                 char *target, *k, *name;
1023
1024                 if (c++ >= FOLLOW_MAX)
1025                         return -ELOOP;
1026
1027                 path_kill_slashes(*filename);
1028
1029                 /* Add the file name we are currently looking at to
1030                  * the names of this unit */
1031                 name = file_name_from_path(*filename);
1032                 if (!(id = set_get(names, name))) {
1033
1034                         if (!(id = strdup(name)))
1035                                 return -ENOMEM;
1036
1037                         if ((r = set_put(names, id)) < 0) {
1038                                 free(id);
1039                                 return r;
1040                         }
1041                 }
1042
1043                 /* Try to open the file name, but don't if its a symlink */
1044                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
1045                         break;
1046
1047                 if (errno != ELOOP)
1048                         return -errno;
1049
1050                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
1051                 if ((r = readlink_malloc(*filename, &target)) < 0)
1052                         return r;
1053
1054                 k = file_in_same_dir(*filename, target);
1055                 free(target);
1056
1057                 if (!k)
1058                         return -ENOMEM;
1059
1060                 free(*filename);
1061                 *filename = k;
1062         }
1063
1064         if (!(f = fdopen(fd, "r"))) {
1065                 r = -errno;
1066                 close_nointr_nofail(fd);
1067                 return r;
1068         }
1069
1070         *_f = f;
1071         *_final = id;
1072         return 0;
1073 }
1074
1075 static int merge_by_names(Unit **u, Set *names, const char *id) {
1076         char *k;
1077         int r;
1078
1079         assert(u);
1080         assert(*u);
1081         assert(names);
1082
1083         /* Let's try to add in all symlink names we found */
1084         while ((k = set_steal_first(names))) {
1085
1086                 /* First try to merge in the other name into our
1087                  * unit */
1088                 if ((r = unit_merge_by_name(*u, k)) < 0) {
1089                         Unit *other;
1090
1091                         /* Hmm, we couldn't merge the other unit into
1092                          * ours? Then let's try it the other way
1093                          * round */
1094
1095                         other = manager_get_unit((*u)->meta.manager, k);
1096                         free(k);
1097
1098                         if (other)
1099                                 if ((r = unit_merge(other, *u)) >= 0) {
1100                                         *u = other;
1101                                         return merge_by_names(u, names, NULL);
1102                                 }
1103
1104                         return r;
1105                 }
1106
1107                 if (id == k)
1108                         unit_choose_id(*u, id);
1109
1110                 free(k);
1111         }
1112
1113         return 0;
1114 }
1115
1116 static void dump_items(FILE *f, const ConfigItem *items) {
1117         const ConfigItem *i;
1118         const char *prev_section = NULL;
1119         bool not_first = false;
1120
1121         struct {
1122                 ConfigParserCallback callback;
1123                 const char *rvalue;
1124         } table[] = {
1125                 { config_parse_int,              "INTEGER" },
1126                 { config_parse_unsigned,         "UNSIGNED" },
1127                 { config_parse_size,             "SIZE" },
1128                 { config_parse_bool,             "BOOLEAN" },
1129                 { config_parse_string,           "STRING" },
1130                 { config_parse_path,             "PATH" },
1131                 { config_parse_strv,             "STRING [...]" },
1132                 { config_parse_nice,             "NICE" },
1133                 { config_parse_oom_adjust,       "OOMADJUST" },
1134                 { config_parse_io_class,         "IOCLASS" },
1135                 { config_parse_io_priority,      "IOPRIORITY" },
1136                 { config_parse_cpu_sched_policy, "CPUSCHEDPOLICY" },
1137                 { config_parse_cpu_sched_prio,   "CPUSCHEDPRIO" },
1138                 { config_parse_cpu_affinity,     "CPUAFFINITY" },
1139                 { config_parse_mode,             "MODE" },
1140                 { config_parse_output,           "OUTPUT" },
1141                 { config_parse_input,            "INPUT" },
1142                 { config_parse_facility,         "FACILITY" },
1143                 { config_parse_level,            "LEVEL" },
1144                 { config_parse_capabilities,     "CAPABILITIES" },
1145                 { config_parse_secure_bits,      "SECUREBITS" },
1146                 { config_parse_bounding_set,     "BOUNDINGSET" },
1147                 { config_parse_timer_slack_ns,   "TIMERSLACK" },
1148                 { config_parse_limit,            "LIMIT" },
1149                 { config_parse_cgroup,           "CGROUP [...]" },
1150                 { config_parse_deps,             "UNIT [...]" },
1151                 { config_parse_names,            "UNIT [...]" },
1152                 { config_parse_exec,             "PATH [ARGUMENT [...]]" },
1153                 { config_parse_service_type,     "SERVICETYPE" },
1154                 { config_parse_service_restart,  "SERVICERESTART" },
1155                 { config_parse_sysv_priority,    "SYSVPRIORITY" },
1156                 { config_parse_kill_mode,        "KILLMODE" },
1157                 { config_parse_listen,           "SOCKET [...]" },
1158                 { config_parse_socket_bind,      "SOCKETBIND" },
1159                 { config_parse_bindtodevice,     "NETWORKINTERFACE" },
1160                 { config_parse_usec,             "SECONDS" },
1161                 { config_parse_path_strv,        "PATH [...]" },
1162                 { config_parse_mount_flags,      "MOUNTFLAG [...]" },
1163                 { config_parse_description,      "DESCRIPTION" },
1164         };
1165
1166         assert(f);
1167         assert(items);
1168
1169         for (i = items; i->lvalue; i++) {
1170                 unsigned j;
1171                 const char *rvalue = "OTHER";
1172
1173                 if (!streq_ptr(i->section, prev_section)) {
1174                         if (!not_first)
1175                                 not_first = true;
1176                         else
1177                                 fputc('\n', f);
1178
1179                         fprintf(f, "[%s]\n", i->section);
1180                         prev_section = i->section;
1181                 }
1182
1183                 for (j = 0; j < ELEMENTSOF(table); j++)
1184                         if (i->parse == table[j].callback) {
1185                                 rvalue = table[j].rvalue;
1186                                 break;
1187                         }
1188
1189                 fprintf(f, "%s=%s\n", i->lvalue, rvalue);
1190         }
1191 }
1192
1193 static int load_from_path(Unit *u, const char *path) {
1194
1195         static const char* const section_table[_UNIT_TYPE_MAX] = {
1196                 [UNIT_SERVICE]   = "Service",
1197                 [UNIT_TIMER]     = "Timer",
1198                 [UNIT_SOCKET]    = "Socket",
1199                 [UNIT_TARGET]    = "Target",
1200                 [UNIT_DEVICE]    = "Device",
1201                 [UNIT_MOUNT]     = "Mount",
1202                 [UNIT_AUTOMOUNT] = "Automount",
1203                 [UNIT_SNAPSHOT]  = "Snapshot",
1204                 [UNIT_SWAP]      = "Swap"
1205         };
1206
1207 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1208                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1209                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1210                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1211                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1212                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1213                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1214                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1215                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1216                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1217                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1218                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1219                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1220                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1221                 { "UMask",                  config_parse_mode,            &(context).umask,                                section   }, \
1222                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1223                 { "StandardInput",          config_parse_input,           &(context).std_input,                            section   }, \
1224                 { "StandardOutput",         config_parse_output,          &(context).std_output,                           section   }, \
1225                 { "StandardError",          config_parse_output,          &(context).std_output,                           section   }, \
1226                 { "TTYPath",                config_parse_path,            &(context).tty_path,                             section   }, \
1227                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1228                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1229                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1230                 { "SyslogNoPrefix",         config_parse_bool,            &(context).syslog_no_prefix,                     section   }, \
1231                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1232                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1233                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1234                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1235                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1236                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1237                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1238                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1239                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1240                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1241                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1242                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1243                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1244                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1245                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1246                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1247                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1248                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1249                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1250                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }, \
1251                 { "ControlGroup",           config_parse_cgroup,          u,                                               section   }, \
1252                 { "ReadWriteDirectories",   config_parse_path_strv,       &(context).read_write_dirs,                      section   }, \
1253                 { "ReadOnlyDirectories",    config_parse_path_strv,       &(context).read_only_dirs,                       section   }, \
1254                 { "InaccessibleDirectories",config_parse_path_strv,       &(context).inaccessible_dirs,                    section   }, \
1255                 { "PrivateTmp",             config_parse_bool,            &(context).private_tmp,                          section   }, \
1256                 { "MountFlags",             config_parse_mount_flags,     &(context),                                      section   }
1257
1258         const ConfigItem items[] = {
1259                 { "Names",                  config_parse_names,           u,                                               "Unit"    },
1260                 { "Description",            config_parse_description,     u,                                               "Unit"    },
1261                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Unit"    },
1262                 { "RequiresOverridable",    config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES_OVERRIDABLE),          "Unit"    },
1263                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Unit"    },
1264                 { "RequisiteOverridable",   config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE_OVERRIDABLE),         "Unit"    },
1265                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Unit"    },
1266                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Unit"    },
1267                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Unit"    },
1268                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Unit"    },
1269                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Unit"    },
1270                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Unit"    },
1271                 { "OnlyByDependency",       config_parse_bool,            &u->meta.only_by_dependency,                     "Unit"    },
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.type,                                "Service" },
1283                 { "Restart",                config_parse_service_restart, &u->service.restart,                             "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                 { "BusName",                config_parse_string,          &u->service.bus_name,                            "Service" },
1291                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1292
1293                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1294                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1295                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1296                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1297                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1298                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1299                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1300                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1301                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1302                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1303                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1304                 { "TimeoutSec",             config_parse_usec,            &u->socket.timeout_usec,                         "Socket"  },
1305                 { "DirectoryMode",          config_parse_mode,            &u->socket.directory_mode,                       "Socket"  },
1306                 { "SocketMode",             config_parse_mode,            &u->socket.socket_mode,                          "Socket"  },
1307                 { "KillMode",               config_parse_kill_mode,       &u->socket.kill_mode,                            "Socket"  },
1308                 { "Accept",                 config_parse_bool,            &u->socket.accept,                               "Socket"  },
1309                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1310
1311                 { "What",                   config_parse_string,          &u->mount.parameters_fragment.what,              "Mount"   },
1312                 { "Where",                  config_parse_path,            &u->mount.where,                                 "Mount"   },
1313                 { "Options",                config_parse_string,          &u->mount.parameters_fragment.options,           "Mount"   },
1314                 { "Type",                   config_parse_string,          &u->mount.parameters_fragment.fstype,            "Mount"   },
1315                 { "TimeoutSec",             config_parse_usec,            &u->mount.timeout_usec,                          "Mount"   },
1316                 { "KillMode",               config_parse_kill_mode,       &u->mount.kill_mode,                             "Mount"   },
1317                 EXEC_CONTEXT_CONFIG_ITEMS(u->mount.exec_context, "Mount"),
1318
1319                 { "Where",                  config_parse_path,            &u->automount.where,                             "Automount" },
1320
1321                 { "What",                   config_parse_path,            &u->swap.parameters_fragment.what,               "Swap" },
1322                 { "Priority",               config_parse_int,             &u->swap.parameters_fragment.priority,           "Swap" },
1323
1324                 { NULL, NULL, NULL, NULL }
1325         };
1326
1327 #undef EXEC_CONTEXT_CONFIG_ITEMS
1328
1329         const char *sections[3];
1330         char *k;
1331         int r;
1332         Set *symlink_names;
1333         FILE *f = NULL;
1334         char *filename = NULL, *id = NULL;
1335         Unit *merged;
1336
1337         if (!u) {
1338                 /* Dirty dirty hack. */
1339                 dump_items((FILE*) path, items);
1340                 return 0;
1341         }
1342
1343         assert(u);
1344         assert(path);
1345
1346         sections[0] = "Unit";
1347         sections[1] = section_table[u->meta.type];
1348         sections[2] = NULL;
1349
1350         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1351                 return -ENOMEM;
1352
1353         if (path_is_absolute(path)) {
1354
1355                 if (!(filename = strdup(path))) {
1356                         r = -ENOMEM;
1357                         goto finish;
1358                 }
1359
1360                 if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1361                         free(filename);
1362                         filename = NULL;
1363
1364                         if (r != -ENOENT)
1365                                 goto finish;
1366                 }
1367
1368         } else  {
1369                 char **p;
1370
1371                 STRV_FOREACH(p, u->meta.manager->unit_path) {
1372
1373                         /* Instead of opening the path right away, we manually
1374                          * follow all symlinks and add their name to our unit
1375                          * name set while doing so */
1376                         if (!(filename = path_make_absolute(path, *p))) {
1377                                 r = -ENOMEM;
1378                                 goto finish;
1379                         }
1380
1381                         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1382                                 char *sn;
1383
1384                                 free(filename);
1385                                 filename = NULL;
1386
1387                                 if (r != -ENOENT)
1388                                         goto finish;
1389
1390                                 /* Empty the symlink names for the next run */
1391                                 while ((sn = set_steal_first(symlink_names)))
1392                                         free(sn);
1393
1394                                 continue;
1395                         }
1396
1397                         break;
1398                 }
1399         }
1400
1401         if (!filename) {
1402                 r = 0;
1403                 goto finish;
1404         }
1405
1406         merged = u;
1407         if ((r = merge_by_names(&merged, symlink_names, id)) < 0)
1408                 goto finish;
1409
1410         if (merged != u) {
1411                 u->meta.load_state = UNIT_MERGED;
1412                 r = 0;
1413                 goto finish;
1414         }
1415
1416         /* Now, parse the file contents */
1417         if ((r = config_parse(filename, f, sections, items, u)) < 0)
1418                 goto finish;
1419
1420         free(u->meta.fragment_path);
1421         u->meta.fragment_path = filename;
1422         filename = NULL;
1423
1424         u->meta.load_state = UNIT_LOADED;
1425         r = 0;
1426
1427 finish:
1428         while ((k = set_steal_first(symlink_names)))
1429                 free(k);
1430
1431         set_free(symlink_names);
1432         free(filename);
1433
1434         if (f)
1435                 fclose(f);
1436
1437         return r;
1438 }
1439
1440 int unit_load_fragment(Unit *u) {
1441         int r;
1442
1443         assert(u);
1444
1445         if (u->meta.fragment_path) {
1446
1447                 if ((r = load_from_path(u, u->meta.fragment_path)) < 0)
1448                         return r;
1449
1450         } else {
1451                 Iterator i;
1452                 const char *t;
1453
1454                 /* Try to find the unit under its id */
1455                 if ((r = load_from_path(u, u->meta.id)) < 0)
1456                         return r;
1457
1458                 /* Try to find an alias we can load this with */
1459                 if (u->meta.load_state == UNIT_STUB)
1460                         SET_FOREACH(t, u->meta.names, i) {
1461
1462                                 if (t == u->meta.id)
1463                                         continue;
1464
1465                                 if ((r = load_from_path(u, t)) < 0)
1466                                         return r;
1467
1468                                 if (u->meta.load_state != UNIT_STUB)
1469                                         break;
1470                         }
1471
1472                 /* Now, follow the same logic, but look for a template */
1473                 if (u->meta.load_state == UNIT_STUB && u->meta.instance) {
1474                         char *k;
1475
1476                         if (!(k = unit_name_template(u->meta.id)))
1477                                 return -ENOMEM;
1478
1479                         r = load_from_path(u, k);
1480                         free(k);
1481
1482                         if (r < 0)
1483                                 return r;
1484
1485                         if (u->meta.load_state == UNIT_STUB)
1486                                 SET_FOREACH(t, u->meta.names, i) {
1487
1488                                         if (t == u->meta.id)
1489                                                 continue;
1490
1491                                         if (!(k = unit_name_template(t)))
1492                                                 return -ENOMEM;
1493
1494                                         r = load_from_path(u, k);
1495                                         free(k);
1496
1497                                         if (r < 0)
1498                                                 return r;
1499
1500                                         if (u->meta.load_state != UNIT_STUB)
1501                                                 break;
1502                                 }
1503                 }
1504         }
1505
1506         return 0;
1507 }
1508
1509 void unit_dump_config_items(FILE *f) {
1510         /* OK, this wins a prize for extreme ugliness. */
1511
1512         load_from_path(NULL, (const void*) f);
1513 }