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         int r;
 256         Socket *s;
 257
 258         assert(filename);
 259         assert(lvalue);
 260         assert(rvalue);
 261         assert(data);
 262
 263         s = (Socket*) data;
 264
 265         if ((r = parse_boolean(rvalue)) < 0) {
 266                 log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 267                 return r;
 268         }
 269
 270         s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 271
 272         return 0;
 273 }
 274
 275 static int config_parse_nice(
 276                 const char *filename,
 277                 unsigned line,
 278                 const char *section,
 279                 const char *lvalue,
 280                 const char *rvalue,
 281                 void *data,
 282                 void *userdata) {
 283
 284         ExecContext *c = data;
 285         int priority, r;
 286
 287         assert(filename);
 288         assert(lvalue);
 289         assert(rvalue);
 290         assert(data);
 291
 292         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 293                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 294                 return r;
 295         }
 296
 297         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 298                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 299                 return -ERANGE;
 300         }
 301
 302         c->nice = priority;
 303         c->nice_set = false;
 304
 305         return 0;
 306 }
 307
 308 static int config_parse_oom_adjust(
 309                 const char *filename,
 310                 unsigned line,
 311                 const char *section,
 312                 const char *lvalue,
 313                 const char *rvalue,
 314                 void *data,
 315                 void *userdata) {
 316
 317         ExecContext *c = data;
 318         int oa, r;
 319
 320         assert(filename);
 321         assert(lvalue);
 322         assert(rvalue);
 323         assert(data);
 324
 325         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 326                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 327                 return r;
 328         }
 329
 330         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 331                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 332                 return -ERANGE;
 333         }
 334
 335         c->oom_adjust = oa;
 336         c->oom_adjust_set = true;
 337
 338         return 0;
 339 }
 340
 341 static int config_parse_mode(
 342                 const char *filename,
 343                 unsigned line,
 344                 const char *section,
 345                 const char *lvalue,
 346                 const char *rvalue,
 347                 void *data,
 348                 void *userdata) {
 349
 350         mode_t *m = data;
 351         long l;
 352         char *x = NULL;
 353
 354         assert(filename);
 355         assert(lvalue);
 356         assert(rvalue);
 357         assert(data);
 358
 359         errno = 0;
 360         l = strtol(rvalue, &x, 8);
 361         if (!x || *x || errno) {
 362                 log_error("[%s:%u] Failed to parse mode value: %s", filename, line, rvalue);
 363                 return errno ? -errno : -EINVAL;
 364         }
 365
 366         if (l < 0000 || l > 07777) {
 367                 log_error("[%s:%u] mode value out of range: %s", filename, line, rvalue);
 368                 return -ERANGE;
 369         }
 370
 371         *m = (mode_t) l;
 372         return 0;
 373 }
 374
 375 static int config_parse_exec(
 376                 const char *filename,
 377                 unsigned line,
 378                 const char *section,
 379                 const char *lvalue,
 380                 const char *rvalue,
 381                 void *data,
 382                 void *userdata) {
 383
 384         ExecCommand **e = data, *nce = NULL;
 385         char **n;
 386         char *w;
 387         unsigned k;
 388         size_t l;
 389         char *state;
 390
 391         assert(filename);
 392         assert(lvalue);
 393         assert(rvalue);
 394         assert(data);
 395
 396         k = 0;
 397         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 398                 k++;
 399
 400         if (!(n = new(char*, k+1)))
 401                 return -ENOMEM;
 402
 403         k = 0;
 404         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 405                 if (!(n[k++] = strndup(w, l)))
 406                         goto fail;
 407
 408         n[k] = NULL;
 409
 410         if (!n[0] || !path_is_absolute(n[0])) {
 411                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 412                 strv_free(n);
 413                 return -EINVAL;
 414         }
 415
 416         if (!(nce = new0(ExecCommand, 1)))
 417                 goto fail;
 418
 419         nce->argv = n;
 420         if (!(nce->path = strdup(n[0])))
 421                 goto fail;
 422
 423         exec_command_append_list(e, nce);
 424
 425         return 0;
 426
 427 fail:
 428         for (; k > 0; k--)
 429                 free(n[k-1]);
 430         free(n);
 431
 432         free(nce);
 433
 434         return -ENOMEM;
 435 }
 436
 437 static int config_parse_usec(
 438                 const char *filename,
 439                 unsigned line,
 440                 const char *section,
 441                 const char *lvalue,
 442                 const char *rvalue,
 443                 void *data,
 444                 void *userdata) {
 445
 446         usec_t *usec = data;
 447         int r;
 448
 449         assert(filename);
 450         assert(lvalue);
 451         assert(rvalue);
 452         assert(data);
 453
 454         if ((r = parse_usec(rvalue, usec)) < 0) {
 455                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 456                 return r;
 457         }
 458
 459         return 0;
 460 }
 461
 462 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_type, service_type, ServiceType, "Failed to parse service type");
 463 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_restart, service_restart, ServiceRestart, "Failed to parse service restart specifier");
 464
 465 static int config_parse_bindtodevice(
 466                 const char *filename,
 467                 unsigned line,
 468                 const char *section,
 469                 const char *lvalue,
 470                 const char *rvalue,
 471                 void *data,
 472                 void *userdata) {
 473
 474         Socket *s = data;
 475         char *n;
 476
 477         assert(filename);
 478         assert(lvalue);
 479         assert(rvalue);
 480         assert(data);
 481
 482         if (rvalue[0] && !streq(rvalue, "*")) {
 483                 if (!(n = strdup(rvalue)))
 484                         return -ENOMEM;
 485         } else
 486                 n = NULL;
 487
 488         free(s->bind_to_device);
 489         s->bind_to_device = n;
 490
 491         return 0;
 492 }
 493
 494 DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
 495 DEFINE_CONFIG_PARSE_ENUM(config_parse_input, exec_input, ExecInput, "Failed to parse input specifier");
 496
 497 static int config_parse_facility(
 498                 const char *filename,
 499                 unsigned line,
 500                 const char *section,
 501                 const char *lvalue,
 502                 const char *rvalue,
 503                 void *data,
 504                 void *userdata) {
 505
 506
 507         int *o = data, x;
 508
 509         assert(filename);
 510         assert(lvalue);
 511         assert(rvalue);
 512         assert(data);
 513
 514         if ((x = log_facility_from_string(rvalue)) < 0) {
 515                 log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 516                 return -EBADMSG;
 517         }
 518
 519         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 520
 521         return 0;
 522 }
 523
 524 static int config_parse_level(
 525                 const char *filename,
 526                 unsigned line,
 527                 const char *section,
 528                 const char *lvalue,
 529                 const char *rvalue,
 530                 void *data,
 531                 void *userdata) {
 532
 533
 534         int *o = data, x;
 535
 536         assert(filename);
 537         assert(lvalue);
 538         assert(rvalue);
 539         assert(data);
 540
 541         if ((x = log_level_from_string(rvalue)) < 0) {
 542                 log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 543                 return -EBADMSG;
 544         }
 545
 546         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 547         return 0;
 548 }
 549
 550 static int config_parse_io_class(
 551                 const char *filename,
 552                 unsigned line,
 553                 const char *section,
 554                 const char *lvalue,
 555                 const char *rvalue,
 556                 void *data,
 557                 void *userdata) {
 558
 559         ExecContext *c = data;
 560         int x;
 561
 562         assert(filename);
 563         assert(lvalue);
 564         assert(rvalue);
 565         assert(data);
 566
 567         if ((x = ioprio_class_from_string(rvalue)) < 0) {
 568                 log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 569                 return -EBADMSG;
 570         }
 571
 572         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 573         c->ioprio_set = true;
 574
 575         return 0;
 576 }
 577
 578 static int config_parse_io_priority(
 579                 const char *filename,
 580                 unsigned line,
 581                 const char *section,
 582                 const char *lvalue,
 583                 const char *rvalue,
 584                 void *data,
 585                 void *userdata) {
 586
 587         ExecContext *c = data;
 588         int i;
 589
 590         assert(filename);
 591         assert(lvalue);
 592         assert(rvalue);
 593         assert(data);
 594
 595         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 596                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 597                 return -EBADMSG;
 598         }
 599
 600         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 601         c->ioprio_set = true;
 602
 603         return 0;
 604 }
 605
 606 static int config_parse_cpu_sched_policy(
 607                 const char *filename,
 608                 unsigned line,
 609                 const char *section,
 610                 const char *lvalue,
 611                 const char *rvalue,
 612                 void *data,
 613                 void *userdata) {
 614
 615
 616         ExecContext *c = data;
 617         int x;
 618
 619         assert(filename);
 620         assert(lvalue);
 621         assert(rvalue);
 622         assert(data);
 623
 624         if ((x = sched_policy_from_string(rvalue)) < 0) {
 625                 log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 626                 return -EBADMSG;
 627         }
 628
 629         c->cpu_sched_policy = x;
 630         c->cpu_sched_set = true;
 631
 632         return 0;
 633 }
 634
 635 static int config_parse_cpu_sched_prio(
 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         ExecContext *c = data;
 645         int i;
 646
 647         assert(filename);
 648         assert(lvalue);
 649         assert(rvalue);
 650         assert(data);
 651
 652         /* On Linux RR/FIFO have the same range */
 653         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 654                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 655                 return -EBADMSG;
 656         }
 657
 658         c->cpu_sched_priority = i;
 659         c->cpu_sched_set = true;
 660
 661         return 0;
 662 }
 663
 664 static int config_parse_cpu_affinity(
 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         char *w;
 675         size_t l;
 676         char *state;
 677
 678         assert(filename);
 679         assert(lvalue);
 680         assert(rvalue);
 681         assert(data);
 682
 683         FOREACH_WORD(w, l, rvalue, state) {
 684                 char *t;
 685                 int r;
 686                 unsigned cpu;
 687
 688                 if (!(t = strndup(w, l)))
 689                         return -ENOMEM;
 690
 691                 r = safe_atou(t, &cpu);
 692                 free(t);
 693
 694                 if (r < 0 || cpu >= CPU_SETSIZE) {
 695                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 696                         return -EBADMSG;
 697                 }
 698
 699                 CPU_SET(cpu, &c->cpu_affinity);
 700         }
 701
 702         c->cpu_affinity_set = true;
 703
 704         return 0;
 705 }
 706
 707 static int config_parse_capabilities(
 708                 const char *filename,
 709                 unsigned line,
 710                 const char *section,
 711                 const char *lvalue,
 712                 const char *rvalue,
 713                 void *data,
 714                 void *userdata) {
 715
 716         ExecContext *c = data;
 717         cap_t cap;
 718
 719         assert(filename);
 720         assert(lvalue);
 721         assert(rvalue);
 722         assert(data);
 723
 724         if (!(cap = cap_from_text(rvalue))) {
 725                 if (errno == ENOMEM)
 726                         return -ENOMEM;
 727
 728                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 729                 return -EBADMSG;
 730         }
 731
 732         if (c->capabilities)
 733                 cap_free(c->capabilities);
 734         c->capabilities = cap;
 735
 736         return 0;
 737 }
 738
 739 static int config_parse_secure_bits(
 740                 const char *filename,
 741                 unsigned line,
 742                 const char *section,
 743                 const char *lvalue,
 744                 const char *rvalue,
 745                 void *data,
 746                 void *userdata) {
 747
 748         ExecContext *c = data;
 749         char *w;
 750         size_t l;
 751         char *state;
 752
 753         assert(filename);
 754         assert(lvalue);
 755         assert(rvalue);
 756         assert(data);
 757
 758         FOREACH_WORD(w, l, rvalue, state) {
 759                 if (first_word(w, "keep-caps"))
 760                         c->secure_bits |= SECURE_KEEP_CAPS;
 761                 else if (first_word(w, "keep-caps-locked"))
 762                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 763                 else if (first_word(w, "no-setuid-fixup"))
 764                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 765                 else if (first_word(w, "no-setuid-fixup-locked"))
 766                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 767                 else if (first_word(w, "noroot"))
 768                         c->secure_bits |= SECURE_NOROOT;
 769                 else if (first_word(w, "noroot-locked"))
 770                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 771                 else {
 772                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 773                         return -EBADMSG;
 774                 }
 775         }
 776
 777         return 0;
 778 }
 779
 780 static int config_parse_bounding_set(
 781                 const char *filename,
 782                 unsigned line,
 783                 const char *section,
 784                 const char *lvalue,
 785                 const char *rvalue,
 786                 void *data,
 787                 void *userdata) {
 788
 789         ExecContext *c = data;
 790         char *w;
 791         size_t l;
 792         char *state;
 793
 794         assert(filename);
 795         assert(lvalue);
 796         assert(rvalue);
 797         assert(data);
 798
 799         FOREACH_WORD(w, l, rvalue, state) {
 800                 char *t;
 801                 int r;
 802                 cap_value_t cap;
 803
 804                 if (!(t = strndup(w, l)))
 805                         return -ENOMEM;
 806
 807                 r = cap_from_name(t, &cap);
 808                 free(t);
 809
 810                 if (r < 0) {
 811                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 812                         return -EBADMSG;
 813                 }
 814
 815                 c->capability_bounding_set_drop |= 1 << cap;
 816         }
 817
 818         return 0;
 819 }
 820
 821 static int config_parse_timer_slack_ns(
 822                 const char *filename,
 823                 unsigned line,
 824                 const char *section,
 825                 const char *lvalue,
 826                 const char *rvalue,
 827                 void *data,
 828                 void *userdata) {
 829
 830         ExecContext *c = data;
 831         unsigned long u;
 832         int r;
 833
 834         assert(filename);
 835         assert(lvalue);
 836         assert(rvalue);
 837         assert(data);
 838
 839         if ((r = safe_atolu(rvalue, &u)) < 0) {
 840                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 841                 return r;
 842         }
 843
 844         c->timer_slack_ns = u;
 845
 846         return 0;
 847 }
 848
 849 static int config_parse_limit(
 850                 const char *filename,
 851                 unsigned line,
 852                 const char *section,
 853                 const char *lvalue,
 854                 const char *rvalue,
 855                 void *data,
 856                 void *userdata) {
 857
 858         struct rlimit **rl = data;
 859         unsigned long long u;
 860         int r;
 861
 862         assert(filename);
 863         assert(lvalue);
 864         assert(rvalue);
 865         assert(data);
 866
 867         if ((r = safe_atollu(rvalue, &u)) < 0) {
 868                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 869                 return r;
 870         }
 871
 872         if (!*rl)
 873                 if (!(*rl = new(struct rlimit, 1)))
 874                         return -ENOMEM;
 875
 876         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 877         return 0;
 878 }
 879
 880 static int config_parse_cgroup(
 881                 const char *filename,
 882                 unsigned line,
 883                 const char *section,
 884                 const char *lvalue,
 885                 const char *rvalue,
 886                 void *data,
 887                 void *userdata) {
 888
 889         Unit *u = userdata;
 890         char *w;
 891         size_t l;
 892         char *state;
 893
 894         FOREACH_WORD(w, l, rvalue, state) {
 895                 char *t;
 896                 int r;
 897
 898                 if (!(t = strndup(w, l)))
 899                         return -ENOMEM;
 900
 901                 r = unit_add_cgroup_from_text(u, t);
 902                 free(t);
 903
 904                 if (r < 0)
 905                         return r;
 906         }
 907
 908         return 0;
 909 }
 910
 911 static int config_parse_sysv_priority(
 912                 const char *filename,
 913                 unsigned line,
 914                 const char *section,
 915                 const char *lvalue,
 916                 const char *rvalue,
 917                 void *data,
 918                 void *userdata) {
 919
 920         int *priority = data;
 921         int r, i;
 922
 923         assert(filename);
 924         assert(lvalue);
 925         assert(rvalue);
 926         assert(data);
 927
 928         if ((r = safe_atoi(rvalue, &i)) < 0 || i < 0) {
 929                 log_error("[%s:%u] Failed to parse SysV start priority: %s", filename, line, rvalue);
 930                 return r;
 931         }
 932
 933         *priority = (int) i;
 934         return 0;
 935 }
 936
 937 DEFINE_CONFIG_PARSE_ENUM(config_parse_kill_mode, kill_mode, KillMode, "Failed to parse kill mode");
 938
 939 static int config_parse_mount_flags(
 940                 const char *filename,
 941                 unsigned line,
 942                 const char *section,
 943                 const char *lvalue,
 944                 const char *rvalue,
 945                 void *data,
 946                 void *userdata) {
 947
 948         ExecContext *c = data;
 949         char *w;
 950         size_t l;
 951         char *state;
 952         unsigned long flags = 0;
 953
 954         assert(filename);
 955         assert(lvalue);
 956         assert(rvalue);
 957         assert(data);
 958
 959         FOREACH_WORD(w, l, rvalue, state) {
 960                 if (strncmp(w, "shared", l) == 0)
 961                         flags |= MS_SHARED;
 962                 else if (strncmp(w, "slave", l) == 0)
 963                         flags |= MS_SLAVE;
 964                 else if (strncmp(w, "private", l) == 0)
 965                         flags |= MS_PRIVATE;
 966                 else {
 967                         log_error("[%s:%u] Failed to parse mount flags: %s", filename, line, rvalue);
 968                         return -EINVAL;
 969                 }
 970         }
 971
 972         c->mount_flags = flags;
 973         return 0;
 974 }
 975
 976 #define FOLLOW_MAX 8
 977
 978 static int open_follow(char **filename, FILE **_f, Set *names, char **_final) {
 979         unsigned c = 0;
 980         int fd, r;
 981         FILE *f;
 982         char *id = NULL;
 983
 984         assert(filename);
 985         assert(*filename);
 986         assert(_f);
 987         assert(names);
 988
 989         /* This will update the filename pointer if the loaded file is
 990          * reached by a symlink. The old string will be freed. */
 991
 992         for (;;) {
 993                 char *target, *k, *name;
 994
 995                 if (c++ >= FOLLOW_MAX)
 996                         return -ELOOP;
 997
 998                 path_kill_slashes(*filename);
 999
1000                 /* Add the file name we are currently looking at to
1001                  * the names of this unit */
1002                 name = file_name_from_path(*filename);
1003                 if (!(id = set_get(names, name))) {
1004
1005                         if (!(id = strdup(name)))
1006                                 return -ENOMEM;
1007
1008                         if ((r = set_put(names, id)) < 0) {
1009                                 free(id);
1010                                 return r;
1011                         }
1012                 }
1013
1014                 /* Try to open the file name, but don't if its a symlink */
1015                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
1016                         break;
1017
1018                 if (errno != ELOOP)
1019                         return -errno;
1020
1021                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
1022                 if ((r = readlink_malloc(*filename, &target)) < 0)
1023                         return r;
1024
1025                 k = file_in_same_dir(*filename, target);
1026                 free(target);
1027
1028                 if (!k)
1029                         return -ENOMEM;
1030
1031                 free(*filename);
1032                 *filename = k;
1033         }
1034
1035         if (!(f = fdopen(fd, "r"))) {
1036                 r = -errno;
1037                 close_nointr_nofail(fd);
1038                 return r;
1039         }
1040
1041         *_f = f;
1042         *_final = id;
1043         return 0;
1044 }
1045
1046 static int merge_by_names(Unit **u, Set *names, const char *id) {
1047         char *k;
1048         int r;
1049
1050         assert(u);
1051         assert(*u);
1052         assert(names);
1053
1054         /* Let's try to add in all symlink names we found */
1055         while ((k = set_steal_first(names))) {
1056
1057                 /* First try to merge in the other name into our
1058                  * unit */
1059                 if ((r = unit_merge_by_name(*u, k)) < 0) {
1060                         Unit *other;
1061
1062                         /* Hmm, we couldn't merge the other unit into
1063                          * ours? Then let's try it the other way
1064                          * round */
1065
1066                         other = manager_get_unit((*u)->meta.manager, k);
1067                         free(k);
1068
1069                         if (other)
1070                                 if ((r = unit_merge(other, *u)) >= 0) {
1071                                         *u = other;
1072                                         return merge_by_names(u, names, NULL);
1073                                 }
1074
1075                         return r;
1076                 }
1077
1078                 if (id == k)
1079                         unit_choose_id(*u, id);
1080
1081                 free(k);
1082         }
1083
1084         return 0;
1085 }
1086
1087 static void dump_items(FILE *f, const ConfigItem *items) {
1088         const ConfigItem *i;
1089         const char *prev_section = NULL;
1090         bool not_first = false;
1091
1092         struct {
1093                 ConfigParserCallback callback;
1094                 const char *rvalue;
1095         } table[] = {
1096                 { config_parse_int,              "INTEGER" },
1097                 { config_parse_unsigned,         "UNSIGNED" },
1098                 { config_parse_size,             "SIZE" },
1099                 { config_parse_bool,             "BOOLEAN" },
1100                 { config_parse_string,           "STRING" },
1101                 { config_parse_path,             "PATH" },
1102                 { config_parse_strv,             "STRING [...]" },
1103                 { config_parse_nice,             "NICE" },
1104                 { config_parse_oom_adjust,       "OOMADJUST" },
1105                 { config_parse_io_class,         "IOCLASS" },
1106                 { config_parse_io_priority,      "IOPRIORITY" },
1107                 { config_parse_cpu_sched_policy, "CPUSCHEDPOLICY" },
1108                 { config_parse_cpu_sched_prio,   "CPUSCHEDPRIO" },
1109                 { config_parse_cpu_affinity,     "CPUAFFINITY" },
1110                 { config_parse_mode,             "MODE" },
1111                 { config_parse_output,           "OUTPUT" },
1112                 { config_parse_input,            "INPUT" },
1113                 { config_parse_facility,         "FACILITY" },
1114                 { config_parse_level,            "LEVEL" },
1115                 { config_parse_capabilities,     "CAPABILITIES" },
1116                 { config_parse_secure_bits,      "SECUREBITS" },
1117                 { config_parse_bounding_set,     "BOUNDINGSET" },
1118                 { config_parse_timer_slack_ns,   "TIMERSLACK" },
1119                 { config_parse_limit,            "LIMIT" },
1120                 { config_parse_cgroup,           "CGROUP [...]" },
1121                 { config_parse_deps,             "UNIT [...]" },
1122                 { config_parse_names,            "UNIT [...]" },
1123                 { config_parse_exec,             "PATH [ARGUMENT [...]]" },
1124                 { config_parse_service_type,     "SERVICETYPE" },
1125                 { config_parse_service_restart,  "SERVICERESTART" },
1126                 { config_parse_sysv_priority,    "SYSVPRIORITY" },
1127                 { config_parse_kill_mode,        "KILLMODE" },
1128                 { config_parse_listen,           "SOCKET [...]" },
1129                 { config_parse_socket_bind,      "SOCKETBIND" },
1130                 { config_parse_bindtodevice,     "NETWORKINTERFACE" },
1131                 { config_parse_usec,             "SECONDS" },
1132                 { config_parse_path_strv,        "PATH [...]" },
1133                 { config_parse_mount_flags,      "MOUNTFLAG [...]" },
1134                 { config_parse_description,      "DESCRIPTION" },
1135         };
1136
1137         assert(f);
1138         assert(items);
1139
1140         for (i = items; i->lvalue; i++) {
1141                 unsigned j;
1142                 const char *rvalue = "OTHER";
1143
1144                 if (!streq_ptr(i->section, prev_section)) {
1145                         if (!not_first)
1146                                 not_first = true;
1147                         else
1148                                 fputc('\n', f);
1149
1150                         fprintf(f, "[%s]\n", i->section);
1151                         prev_section = i->section;
1152                 }
1153
1154                 for (j = 0; j < ELEMENTSOF(table); j++)
1155                         if (i->parse == table[j].callback) {
1156                                 rvalue = table[j].rvalue;
1157                                 break;
1158                         }
1159
1160                 fprintf(f, "%s=%s\n", i->lvalue, rvalue);
1161         }
1162 }
1163
1164 static int load_from_path(Unit *u, const char *path) {
1165
1166         static const char* const section_table[_UNIT_TYPE_MAX] = {
1167                 [UNIT_SERVICE]   = "Service",
1168                 [UNIT_TIMER]     = "Timer",
1169                 [UNIT_SOCKET]    = "Socket",
1170                 [UNIT_TARGET]    = "Target",
1171                 [UNIT_DEVICE]    = "Device",
1172                 [UNIT_MOUNT]     = "Mount",
1173                 [UNIT_AUTOMOUNT] = "Automount",
1174                 [UNIT_SNAPSHOT]  = "Snapshot",
1175                 [UNIT_SWAP]      = "Swap"
1176         };
1177
1178 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1179                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1180                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1181                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1182                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1183                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1184                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1185                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1186                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1187                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1188                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1189                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1190                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1191                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1192                 { "UMask",                  config_parse_mode,            &(context).umask,                                section   }, \
1193                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1194                 { "StandardInput",          config_parse_input,           &(context).std_input,                            section   }, \
1195                 { "StandardOutput",         config_parse_output,          &(context).std_output,                           section   }, \
1196                 { "StandardError",          config_parse_output,          &(context).std_output,                           section   }, \
1197                 { "TTYPath",                config_parse_path,            &(context).tty_path,                             section   }, \
1198                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1199                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1200                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1201                 { "SyslogNoPrefix",         config_parse_bool,            &(context).syslog_no_prefix,                     section   }, \
1202                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1203                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1204                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1205                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1206                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1207                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1208                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1209                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1210                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1211                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1212                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1213                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1214                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1215                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1216                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1217                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1218                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1219                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1220                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1221                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }, \
1222                 { "ControlGroup",           config_parse_cgroup,          u,                                               section   }, \
1223                 { "ReadWriteDirectories",   config_parse_path_strv,       &(context).read_write_dirs,                      section   }, \
1224                 { "ReadOnlyDirectories",    config_parse_path_strv,       &(context).read_only_dirs,                       section   }, \
1225                 { "InaccessibleDirectories",config_parse_path_strv,       &(context).inaccessible_dirs,                    section   }, \
1226                 { "PrivateTmp",             config_parse_bool,            &(context).private_tmp,                          section   }, \
1227                 { "MountFlags",             config_parse_mount_flags,     &(context),                                      section   }
1228
1229         const ConfigItem items[] = {
1230                 { "Names",                  config_parse_names,           u,                                               "Unit"    },
1231                 { "Description",            config_parse_description,     u,                                               "Unit"    },
1232                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Unit"    },
1233                 { "RequiresOverridable",    config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES_OVERRIDABLE),          "Unit"    },
1234                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Unit"    },
1235                 { "RequisiteOverridable",   config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE_OVERRIDABLE),         "Unit"    },
1236                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Unit"    },
1237                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Unit"    },
1238                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Unit"    },
1239                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Unit"    },
1240                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Unit"    },
1241                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Unit"    },
1242
1243                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                            "Service" },
1244                 { "ExecStartPre",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_PRE,  "Service" },
1245                 { "ExecStart",              config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START,      "Service" },
1246                 { "ExecStartPost",          config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_POST, "Service" },
1247                 { "ExecReload",             config_parse_exec,            u->service.exec_command+SERVICE_EXEC_RELOAD,     "Service" },
1248                 { "ExecStop",               config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP,       "Service" },
1249                 { "ExecStopPost",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP_POST,  "Service" },
1250                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                        "Service" },
1251                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                        "Service" },
1252                 { "Type",                   config_parse_service_type,    &u->service.type,                                "Service" },
1253                 { "Restart",                config_parse_service_restart, &u->service.restart,                             "Service" },
1254                 { "PermissionsStartOnly",   config_parse_bool,            &u->service.permissions_start_only,              "Service" },
1255                 { "RootDirectoryStartOnly", config_parse_bool,            &u->service.root_directory_start_only,           "Service" },
1256                 { "ValidNoProcess",         config_parse_bool,            &u->service.valid_no_process,                    "Service" },
1257                 { "SysVStartPriority",      config_parse_sysv_priority,   &u->service.sysv_start_priority,                 "Service" },
1258                 { "KillMode",               config_parse_kill_mode,       &u->service.kill_mode,                           "Service" },
1259                 { "NonBlocking",            config_parse_bool,            &u->service.exec_context.non_blocking,           "Service" },
1260                 { "BusName",                config_parse_string,          &u->service.bus_name,                            "Service" },
1261                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1262
1263                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1264                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1265                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1266                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1267                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1268                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1269                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1270                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1271                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1272                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1273                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1274                 { "TimeoutSec",             config_parse_usec,            &u->socket.timeout_usec,                         "Socket"  },
1275                 { "DirectoryMode",          config_parse_mode,            &u->socket.directory_mode,                       "Socket"  },
1276                 { "SocketMode",             config_parse_mode,            &u->socket.socket_mode,                          "Socket"  },
1277                 { "KillMode",               config_parse_kill_mode,       &u->socket.kill_mode,                            "Socket"  },
1278                 { "Accept",                 config_parse_bool,            &u->socket.accept,                               "Socket"  },
1279                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1280
1281                 { "What",                   config_parse_string,          &u->mount.parameters_fragment.what,              "Mount"   },
1282                 { "Where",                  config_parse_path,            &u->mount.where,                                 "Mount"   },
1283                 { "Options",                config_parse_string,          &u->mount.parameters_fragment.options,           "Mount"   },
1284                 { "Type",                   config_parse_string,          &u->mount.parameters_fragment.fstype,            "Mount"   },
1285                 { "TimeoutSec",             config_parse_usec,            &u->mount.timeout_usec,                          "Mount"   },
1286                 { "KillMode",               config_parse_kill_mode,       &u->mount.kill_mode,                             "Mount"   },
1287                 EXEC_CONTEXT_CONFIG_ITEMS(u->mount.exec_context, "Mount"),
1288
1289                 { "Where",                  config_parse_path,            &u->automount.where,                             "Automount" },
1290
1291                 { "What",                   config_parse_path,            &u->swap.parameters_fragment.what,               "Swap" },
1292                 { "Priority",               config_parse_int,             &u->swap.parameters_fragment.priority,           "Swap" },
1293
1294                 { NULL, NULL, NULL, NULL }
1295         };
1296
1297 #undef EXEC_CONTEXT_CONFIG_ITEMS
1298
1299         const char *sections[3];
1300         char *k;
1301         int r;
1302         Set *symlink_names;
1303         FILE *f = NULL;
1304         char *filename = NULL, *id = NULL;
1305         Unit *merged;
1306
1307         if (!u) {
1308                 /* Dirty dirty hack. */
1309                 dump_items((FILE*) path, items);
1310                 return 0;
1311         }
1312
1313         assert(u);
1314         assert(path);
1315
1316         sections[0] = "Unit";
1317         sections[1] = section_table[u->meta.type];
1318         sections[2] = NULL;
1319
1320         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1321                 return -ENOMEM;
1322
1323         if (path_is_absolute(path)) {
1324
1325                 if (!(filename = strdup(path))) {
1326                         r = -ENOMEM;
1327                         goto finish;
1328                 }
1329
1330                 if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1331                         free(filename);
1332                         filename = NULL;
1333
1334                         if (r != -ENOENT)
1335                                 goto finish;
1336                 }
1337
1338         } else  {
1339                 char **p;
1340
1341                 STRV_FOREACH(p, u->meta.manager->unit_path) {
1342
1343                         /* Instead of opening the path right away, we manually
1344                          * follow all symlinks and add their name to our unit
1345                          * name set while doing so */
1346                         if (!(filename = path_make_absolute(path, *p))) {
1347                                 r = -ENOMEM;
1348                                 goto finish;
1349                         }
1350
1351                         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1352                                 char *sn;
1353
1354                                 free(filename);
1355                                 filename = NULL;
1356
1357                                 if (r != -ENOENT)
1358                                         goto finish;
1359
1360                                 /* Empty the symlink names for the next run */
1361                                 while ((sn = set_steal_first(symlink_names)))
1362                                         free(sn);
1363
1364                                 continue;
1365                         }
1366
1367                         break;
1368                 }
1369         }
1370
1371         if (!filename) {
1372                 r = 0;
1373                 goto finish;
1374         }
1375
1376         merged = u;
1377         if ((r = merge_by_names(&merged, symlink_names, id)) < 0)
1378                 goto finish;
1379
1380         if (merged != u) {
1381                 u->meta.load_state = UNIT_MERGED;
1382                 r = 0;
1383                 goto finish;
1384         }
1385
1386         /* Now, parse the file contents */
1387         if ((r = config_parse(filename, f, sections, items, u)) < 0)
1388                 goto finish;
1389
1390         free(u->meta.fragment_path);
1391         u->meta.fragment_path = filename;
1392         filename = NULL;
1393
1394         u->meta.load_state = UNIT_LOADED;
1395         r = 0;
1396
1397 finish:
1398         while ((k = set_steal_first(symlink_names)))
1399                 free(k);
1400
1401         set_free(symlink_names);
1402         free(filename);
1403
1404         if (f)
1405                 fclose(f);
1406
1407         return r;
1408 }
1409
1410 int unit_load_fragment(Unit *u) {
1411         int r;
1412
1413         assert(u);
1414
1415         if (u->meta.fragment_path) {
1416
1417                 if ((r = load_from_path(u, u->meta.fragment_path)) < 0)
1418                         return r;
1419
1420         } else {
1421                 Iterator i;
1422                 const char *t;
1423
1424                 /* Try to find the unit under its id */
1425                 if ((r = load_from_path(u, u->meta.id)) < 0)
1426                         return r;
1427
1428                 /* Try to find an alias we can load this with */
1429                 if (u->meta.load_state == UNIT_STUB)
1430                         SET_FOREACH(t, u->meta.names, i) {
1431
1432                                 if (t == u->meta.id)
1433                                         continue;
1434
1435                                 if ((r = load_from_path(u, t)) < 0)
1436                                         return r;
1437
1438                                 if (u->meta.load_state != UNIT_STUB)
1439                                         break;
1440                         }
1441
1442                 /* Now, follow the same logic, but look for a template */
1443                 if (u->meta.load_state == UNIT_STUB && u->meta.instance) {
1444                         char *k;
1445
1446                         if (!(k = unit_name_template(u->meta.id)))
1447                                 return -ENOMEM;
1448
1449                         r = load_from_path(u, k);
1450                         free(k);
1451
1452                         if (r < 0)
1453                                 return r;
1454
1455                         if (u->meta.load_state == UNIT_STUB)
1456                                 SET_FOREACH(t, u->meta.names, i) {
1457
1458                                         if (t == u->meta.id)
1459                                                 continue;
1460
1461                                         if (!(k = unit_name_template(t)))
1462                                                 return -ENOMEM;
1463
1464                                         r = load_from_path(u, k);
1465                                         free(k);
1466
1467                                         if (r < 0)
1468                                                 return r;
1469
1470                                         if (u->meta.load_state != UNIT_STUB)
1471                                                 break;
1472                                 }
1473                 }
1474         }
1475
1476         return 0;
1477 }
1478
1479 void unit_dump_config_items(FILE *f) {
1480         /* OK, this wins a prize for extreme ugliness. */
1481
1482         load_from_path(NULL, (const void*) f);
1483 }