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         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, *path = NULL;
 390         bool honour_argv0, write_to_path;
 391
 392         assert(filename);
 393         assert(lvalue);
 394         assert(rvalue);
 395         assert(data);
 396
 397         /* We accept an absolute path as first argument, or
 398          * alternatively an absolute prefixed with @ to allow
 399          * overriding of argv[0]. */
 400
 401         honour_argv0 = rvalue[0] == '@';
 402
 403         if (rvalue[honour_argv0 ? 1 : 0] != '/') {
 404                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 405                 return -EINVAL;
 406         }
 407
 408         k = 0;
 409         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 410                 k++;
 411
 412         if (!(n = new(char*, k + (honour_argv0 ? 0 : 1))))
 413                 return -ENOMEM;
 414
 415         k = 0;
 416         write_to_path = honour_argv0;
 417         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 418                 if (write_to_path) {
 419                         if (!(path = strndup(w+1, l-1)))
 420                                 goto fail;
 421                         write_to_path = false;
 422                 } else {
 423                         if (!(n[k++] = strndup(w, l)))
 424                                 goto fail;
 425                 }
 426         }
 427
 428         n[k] = NULL;
 429
 430         if (!n[0]) {
 431                 log_error("[%s:%u] Invalid command line: %s", filename, line, rvalue);
 432                 strv_free(n);
 433                 return -EINVAL;
 434         }
 435
 436         if (!path)
 437                 if (!(path = strdup(n[0])))
 438                         goto fail;
 439
 440         assert(path_is_absolute(path));
 441
 442         if (!(nce = new0(ExecCommand, 1)))
 443                 goto fail;
 444
 445         nce->argv = n;
 446         nce->path = path;
 447
 448         exec_command_append_list(e, nce);
 449
 450         return 0;
 451
 452 fail:
 453         n[k] = NULL;
 454         strv_free(n);
 455         free(path);
 456         free(nce);
 457
 458         return -ENOMEM;
 459 }
 460
 461 static int config_parse_usec(
 462                 const char *filename,
 463                 unsigned line,
 464                 const char *section,
 465                 const char *lvalue,
 466                 const char *rvalue,
 467                 void *data,
 468                 void *userdata) {
 469
 470         usec_t *usec = data;
 471         int r;
 472
 473         assert(filename);
 474         assert(lvalue);
 475         assert(rvalue);
 476         assert(data);
 477
 478         if ((r = parse_usec(rvalue, usec)) < 0) {
 479                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 480                 return r;
 481         }
 482
 483         return 0;
 484 }
 485
 486 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_type, service_type, ServiceType, "Failed to parse service type");
 487 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_restart, service_restart, ServiceRestart, "Failed to parse service restart specifier");
 488
 489 static int config_parse_bindtodevice(
 490                 const char *filename,
 491                 unsigned line,
 492                 const char *section,
 493                 const char *lvalue,
 494                 const char *rvalue,
 495                 void *data,
 496                 void *userdata) {
 497
 498         Socket *s = data;
 499         char *n;
 500
 501         assert(filename);
 502         assert(lvalue);
 503         assert(rvalue);
 504         assert(data);
 505
 506         if (rvalue[0] && !streq(rvalue, "*")) {
 507                 if (!(n = strdup(rvalue)))
 508                         return -ENOMEM;
 509         } else
 510                 n = NULL;
 511
 512         free(s->bind_to_device);
 513         s->bind_to_device = n;
 514
 515         return 0;
 516 }
 517
 518 DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
 519 DEFINE_CONFIG_PARSE_ENUM(config_parse_input, exec_input, ExecInput, "Failed to parse input specifier");
 520
 521 static int config_parse_facility(
 522                 const char *filename,
 523                 unsigned line,
 524                 const char *section,
 525                 const char *lvalue,
 526                 const char *rvalue,
 527                 void *data,
 528                 void *userdata) {
 529
 530
 531         int *o = data, x;
 532
 533         assert(filename);
 534         assert(lvalue);
 535         assert(rvalue);
 536         assert(data);
 537
 538         if ((x = log_facility_from_string(rvalue)) < 0) {
 539                 log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 540                 return -EBADMSG;
 541         }
 542
 543         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 544
 545         return 0;
 546 }
 547
 548 static int config_parse_level(
 549                 const char *filename,
 550                 unsigned line,
 551                 const char *section,
 552                 const char *lvalue,
 553                 const char *rvalue,
 554                 void *data,
 555                 void *userdata) {
 556
 557
 558         int *o = data, x;
 559
 560         assert(filename);
 561         assert(lvalue);
 562         assert(rvalue);
 563         assert(data);
 564
 565         if ((x = log_level_from_string(rvalue)) < 0) {
 566                 log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 567                 return -EBADMSG;
 568         }
 569
 570         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 571         return 0;
 572 }
 573
 574 static int config_parse_io_class(
 575                 const char *filename,
 576                 unsigned line,
 577                 const char *section,
 578                 const char *lvalue,
 579                 const char *rvalue,
 580                 void *data,
 581                 void *userdata) {
 582
 583         ExecContext *c = data;
 584         int x;
 585
 586         assert(filename);
 587         assert(lvalue);
 588         assert(rvalue);
 589         assert(data);
 590
 591         if ((x = ioprio_class_from_string(rvalue)) < 0) {
 592                 log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 593                 return -EBADMSG;
 594         }
 595
 596         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 597         c->ioprio_set = true;
 598
 599         return 0;
 600 }
 601
 602 static int config_parse_io_priority(
 603                 const char *filename,
 604                 unsigned line,
 605                 const char *section,
 606                 const char *lvalue,
 607                 const char *rvalue,
 608                 void *data,
 609                 void *userdata) {
 610
 611         ExecContext *c = data;
 612         int i;
 613
 614         assert(filename);
 615         assert(lvalue);
 616         assert(rvalue);
 617         assert(data);
 618
 619         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 620                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 621                 return -EBADMSG;
 622         }
 623
 624         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 625         c->ioprio_set = true;
 626
 627         return 0;
 628 }
 629
 630 static int config_parse_cpu_sched_policy(
 631                 const char *filename,
 632                 unsigned line,
 633                 const char *section,
 634                 const char *lvalue,
 635                 const char *rvalue,
 636                 void *data,
 637                 void *userdata) {
 638
 639
 640         ExecContext *c = data;
 641         int x;
 642
 643         assert(filename);
 644         assert(lvalue);
 645         assert(rvalue);
 646         assert(data);
 647
 648         if ((x = sched_policy_from_string(rvalue)) < 0) {
 649                 log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 650                 return -EBADMSG;
 651         }
 652
 653         c->cpu_sched_policy = x;
 654         c->cpu_sched_set = true;
 655
 656         return 0;
 657 }
 658
 659 static int config_parse_cpu_sched_prio(
 660                 const char *filename,
 661                 unsigned line,
 662                 const char *section,
 663                 const char *lvalue,
 664                 const char *rvalue,
 665                 void *data,
 666                 void *userdata) {
 667
 668         ExecContext *c = data;
 669         int i;
 670
 671         assert(filename);
 672         assert(lvalue);
 673         assert(rvalue);
 674         assert(data);
 675
 676         /* On Linux RR/FIFO have the same range */
 677         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 678                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 679                 return -EBADMSG;
 680         }
 681
 682         c->cpu_sched_priority = i;
 683         c->cpu_sched_set = true;
 684
 685         return 0;
 686 }
 687
 688 static int config_parse_cpu_affinity(
 689                 const char *filename,
 690                 unsigned line,
 691                 const char *section,
 692                 const char *lvalue,
 693                 const char *rvalue,
 694                 void *data,
 695                 void *userdata) {
 696
 697         ExecContext *c = data;
 698         char *w;
 699         size_t l;
 700         char *state;
 701
 702         assert(filename);
 703         assert(lvalue);
 704         assert(rvalue);
 705         assert(data);
 706
 707         FOREACH_WORD(w, l, rvalue, state) {
 708                 char *t;
 709                 int r;
 710                 unsigned cpu;
 711
 712                 if (!(t = strndup(w, l)))
 713                         return -ENOMEM;
 714
 715                 r = safe_atou(t, &cpu);
 716                 free(t);
 717
 718                 if (r < 0 || cpu >= CPU_SETSIZE) {
 719                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 720                         return -EBADMSG;
 721                 }
 722
 723                 CPU_SET(cpu, &c->cpu_affinity);
 724         }
 725
 726         c->cpu_affinity_set = true;
 727
 728         return 0;
 729 }
 730
 731 static int config_parse_capabilities(
 732                 const char *filename,
 733                 unsigned line,
 734                 const char *section,
 735                 const char *lvalue,
 736                 const char *rvalue,
 737                 void *data,
 738                 void *userdata) {
 739
 740         ExecContext *c = data;
 741         cap_t cap;
 742
 743         assert(filename);
 744         assert(lvalue);
 745         assert(rvalue);
 746         assert(data);
 747
 748         if (!(cap = cap_from_text(rvalue))) {
 749                 if (errno == ENOMEM)
 750                         return -ENOMEM;
 751
 752                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 753                 return -EBADMSG;
 754         }
 755
 756         if (c->capabilities)
 757                 cap_free(c->capabilities);
 758         c->capabilities = cap;
 759
 760         return 0;
 761 }
 762
 763 static int config_parse_secure_bits(
 764                 const char *filename,
 765                 unsigned line,
 766                 const char *section,
 767                 const char *lvalue,
 768                 const char *rvalue,
 769                 void *data,
 770                 void *userdata) {
 771
 772         ExecContext *c = data;
 773         char *w;
 774         size_t l;
 775         char *state;
 776
 777         assert(filename);
 778         assert(lvalue);
 779         assert(rvalue);
 780         assert(data);
 781
 782         FOREACH_WORD(w, l, rvalue, state) {
 783                 if (first_word(w, "keep-caps"))
 784                         c->secure_bits |= SECURE_KEEP_CAPS;
 785                 else if (first_word(w, "keep-caps-locked"))
 786                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 787                 else if (first_word(w, "no-setuid-fixup"))
 788                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 789                 else if (first_word(w, "no-setuid-fixup-locked"))
 790                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 791                 else if (first_word(w, "noroot"))
 792                         c->secure_bits |= SECURE_NOROOT;
 793                 else if (first_word(w, "noroot-locked"))
 794                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 795                 else {
 796                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 797                         return -EBADMSG;
 798                 }
 799         }
 800
 801         return 0;
 802 }
 803
 804 static int config_parse_bounding_set(
 805                 const char *filename,
 806                 unsigned line,
 807                 const char *section,
 808                 const char *lvalue,
 809                 const char *rvalue,
 810                 void *data,
 811                 void *userdata) {
 812
 813         ExecContext *c = data;
 814         char *w;
 815         size_t l;
 816         char *state;
 817
 818         assert(filename);
 819         assert(lvalue);
 820         assert(rvalue);
 821         assert(data);
 822
 823         FOREACH_WORD(w, l, rvalue, state) {
 824                 char *t;
 825                 int r;
 826                 cap_value_t cap;
 827
 828                 if (!(t = strndup(w, l)))
 829                         return -ENOMEM;
 830
 831                 r = cap_from_name(t, &cap);
 832                 free(t);
 833
 834                 if (r < 0) {
 835                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 836                         return -EBADMSG;
 837                 }
 838
 839                 c->capability_bounding_set_drop |= 1 << cap;
 840         }
 841
 842         return 0;
 843 }
 844
 845 static int config_parse_timer_slack_ns(
 846                 const char *filename,
 847                 unsigned line,
 848                 const char *section,
 849                 const char *lvalue,
 850                 const char *rvalue,
 851                 void *data,
 852                 void *userdata) {
 853
 854         ExecContext *c = data;
 855         unsigned long u;
 856         int r;
 857
 858         assert(filename);
 859         assert(lvalue);
 860         assert(rvalue);
 861         assert(data);
 862
 863         if ((r = safe_atolu(rvalue, &u)) < 0) {
 864                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 865                 return r;
 866         }
 867
 868         c->timer_slack_ns = u;
 869
 870         return 0;
 871 }
 872
 873 static int config_parse_limit(
 874                 const char *filename,
 875                 unsigned line,
 876                 const char *section,
 877                 const char *lvalue,
 878                 const char *rvalue,
 879                 void *data,
 880                 void *userdata) {
 881
 882         struct rlimit **rl = data;
 883         unsigned long long u;
 884         int r;
 885
 886         assert(filename);
 887         assert(lvalue);
 888         assert(rvalue);
 889         assert(data);
 890
 891         if ((r = safe_atollu(rvalue, &u)) < 0) {
 892                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 893                 return r;
 894         }
 895
 896         if (!*rl)
 897                 if (!(*rl = new(struct rlimit, 1)))
 898                         return -ENOMEM;
 899
 900         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 901         return 0;
 902 }
 903
 904 static int config_parse_cgroup(
 905                 const char *filename,
 906                 unsigned line,
 907                 const char *section,
 908                 const char *lvalue,
 909                 const char *rvalue,
 910                 void *data,
 911                 void *userdata) {
 912
 913         Unit *u = userdata;
 914         char *w;
 915         size_t l;
 916         char *state;
 917
 918         FOREACH_WORD(w, l, rvalue, state) {
 919                 char *t;
 920                 int r;
 921
 922                 if (!(t = strndup(w, l)))
 923                         return -ENOMEM;
 924
 925                 r = unit_add_cgroup_from_text(u, t);
 926                 free(t);
 927
 928                 if (r < 0)
 929                         return r;
 930         }
 931
 932         return 0;
 933 }
 934
 935 static int config_parse_sysv_priority(
 936                 const char *filename,
 937                 unsigned line,
 938                 const char *section,
 939                 const char *lvalue,
 940                 const char *rvalue,
 941                 void *data,
 942                 void *userdata) {
 943
 944         int *priority = data;
 945         int r, i;
 946
 947         assert(filename);
 948         assert(lvalue);
 949         assert(rvalue);
 950         assert(data);
 951
 952         if ((r = safe_atoi(rvalue, &i)) < 0 || i < 0) {
 953                 log_error("[%s:%u] Failed to parse SysV start priority: %s", filename, line, rvalue);
 954                 return r;
 955         }
 956
 957         *priority = (int) i;
 958         return 0;
 959 }
 960
 961 DEFINE_CONFIG_PARSE_ENUM(config_parse_kill_mode, kill_mode, KillMode, "Failed to parse kill mode");
 962
 963 static int config_parse_mount_flags(
 964                 const char *filename,
 965                 unsigned line,
 966                 const char *section,
 967                 const char *lvalue,
 968                 const char *rvalue,
 969                 void *data,
 970                 void *userdata) {
 971
 972         ExecContext *c = data;
 973         char *w;
 974         size_t l;
 975         char *state;
 976         unsigned long flags = 0;
 977
 978         assert(filename);
 979         assert(lvalue);
 980         assert(rvalue);
 981         assert(data);
 982
 983         FOREACH_WORD(w, l, rvalue, state) {
 984                 if (strncmp(w, "shared", l) == 0)
 985                         flags |= MS_SHARED;
 986                 else if (strncmp(w, "slave", l) == 0)
 987                         flags |= MS_SLAVE;
 988                 else if (strncmp(w, "private", l) == 0)
 989                         flags |= MS_PRIVATE;
 990                 else {
 991                         log_error("[%s:%u] Failed to parse mount flags: %s", filename, line, rvalue);
 992                         return -EINVAL;
 993                 }
 994         }
 995
 996         c->mount_flags = flags;
 997         return 0;
 998 }
 999
1000 #define FOLLOW_MAX 8
1001
1002 static int open_follow(char **filename, FILE **_f, Set *names, char **_final) {
1003         unsigned c = 0;
1004         int fd, r;
1005         FILE *f;
1006         char *id = NULL;
1007
1008         assert(filename);
1009         assert(*filename);
1010         assert(_f);
1011         assert(names);
1012
1013         /* This will update the filename pointer if the loaded file is
1014          * reached by a symlink. The old string will be freed. */
1015
1016         for (;;) {
1017                 char *target, *k, *name;
1018
1019                 if (c++ >= FOLLOW_MAX)
1020                         return -ELOOP;
1021
1022                 path_kill_slashes(*filename);
1023
1024                 /* Add the file name we are currently looking at to
1025                  * the names of this unit */
1026                 name = file_name_from_path(*filename);
1027                 if (!(id = set_get(names, name))) {
1028
1029                         if (!(id = strdup(name)))
1030                                 return -ENOMEM;
1031
1032                         if ((r = set_put(names, id)) < 0) {
1033                                 free(id);
1034                                 return r;
1035                         }
1036                 }
1037
1038                 /* Try to open the file name, but don't if its a symlink */
1039                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
1040                         break;
1041
1042                 if (errno != ELOOP)
1043                         return -errno;
1044
1045                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
1046                 if ((r = readlink_malloc(*filename, &target)) < 0)
1047                         return r;
1048
1049                 k = file_in_same_dir(*filename, target);
1050                 free(target);
1051
1052                 if (!k)
1053                         return -ENOMEM;
1054
1055                 free(*filename);
1056                 *filename = k;
1057         }
1058
1059         if (!(f = fdopen(fd, "r"))) {
1060                 r = -errno;
1061                 close_nointr_nofail(fd);
1062                 return r;
1063         }
1064
1065         *_f = f;
1066         *_final = id;
1067         return 0;
1068 }
1069
1070 static int merge_by_names(Unit **u, Set *names, const char *id) {
1071         char *k;
1072         int r;
1073
1074         assert(u);
1075         assert(*u);
1076         assert(names);
1077
1078         /* Let's try to add in all symlink names we found */
1079         while ((k = set_steal_first(names))) {
1080
1081                 /* First try to merge in the other name into our
1082                  * unit */
1083                 if ((r = unit_merge_by_name(*u, k)) < 0) {
1084                         Unit *other;
1085
1086                         /* Hmm, we couldn't merge the other unit into
1087                          * ours? Then let's try it the other way
1088                          * round */
1089
1090                         other = manager_get_unit((*u)->meta.manager, k);
1091                         free(k);
1092
1093                         if (other)
1094                                 if ((r = unit_merge(other, *u)) >= 0) {
1095                                         *u = other;
1096                                         return merge_by_names(u, names, NULL);
1097                                 }
1098
1099                         return r;
1100                 }
1101
1102                 if (id == k)
1103                         unit_choose_id(*u, id);
1104
1105                 free(k);
1106         }
1107
1108         return 0;
1109 }
1110
1111 static void dump_items(FILE *f, const ConfigItem *items) {
1112         const ConfigItem *i;
1113         const char *prev_section = NULL;
1114         bool not_first = false;
1115
1116         struct {
1117                 ConfigParserCallback callback;
1118                 const char *rvalue;
1119         } table[] = {
1120                 { config_parse_int,              "INTEGER" },
1121                 { config_parse_unsigned,         "UNSIGNED" },
1122                 { config_parse_size,             "SIZE" },
1123                 { config_parse_bool,             "BOOLEAN" },
1124                 { config_parse_string,           "STRING" },
1125                 { config_parse_path,             "PATH" },
1126                 { config_parse_strv,             "STRING [...]" },
1127                 { config_parse_nice,             "NICE" },
1128                 { config_parse_oom_adjust,       "OOMADJUST" },
1129                 { config_parse_io_class,         "IOCLASS" },
1130                 { config_parse_io_priority,      "IOPRIORITY" },
1131                 { config_parse_cpu_sched_policy, "CPUSCHEDPOLICY" },
1132                 { config_parse_cpu_sched_prio,   "CPUSCHEDPRIO" },
1133                 { config_parse_cpu_affinity,     "CPUAFFINITY" },
1134                 { config_parse_mode,             "MODE" },
1135                 { config_parse_output,           "OUTPUT" },
1136                 { config_parse_input,            "INPUT" },
1137                 { config_parse_facility,         "FACILITY" },
1138                 { config_parse_level,            "LEVEL" },
1139                 { config_parse_capabilities,     "CAPABILITIES" },
1140                 { config_parse_secure_bits,      "SECUREBITS" },
1141                 { config_parse_bounding_set,     "BOUNDINGSET" },
1142                 { config_parse_timer_slack_ns,   "TIMERSLACK" },
1143                 { config_parse_limit,            "LIMIT" },
1144                 { config_parse_cgroup,           "CGROUP [...]" },
1145                 { config_parse_deps,             "UNIT [...]" },
1146                 { config_parse_names,            "UNIT [...]" },
1147                 { config_parse_exec,             "PATH [ARGUMENT [...]]" },
1148                 { config_parse_service_type,     "SERVICETYPE" },
1149                 { config_parse_service_restart,  "SERVICERESTART" },
1150                 { config_parse_sysv_priority,    "SYSVPRIORITY" },
1151                 { config_parse_kill_mode,        "KILLMODE" },
1152                 { config_parse_listen,           "SOCKET [...]" },
1153                 { config_parse_socket_bind,      "SOCKETBIND" },
1154                 { config_parse_bindtodevice,     "NETWORKINTERFACE" },
1155                 { config_parse_usec,             "SECONDS" },
1156                 { config_parse_path_strv,        "PATH [...]" },
1157                 { config_parse_mount_flags,      "MOUNTFLAG [...]" },
1158                 { config_parse_description,      "DESCRIPTION" },
1159         };
1160
1161         assert(f);
1162         assert(items);
1163
1164         for (i = items; i->lvalue; i++) {
1165                 unsigned j;
1166                 const char *rvalue = "OTHER";
1167
1168                 if (!streq_ptr(i->section, prev_section)) {
1169                         if (!not_first)
1170                                 not_first = true;
1171                         else
1172                                 fputc('\n', f);
1173
1174                         fprintf(f, "[%s]\n", i->section);
1175                         prev_section = i->section;
1176                 }
1177
1178                 for (j = 0; j < ELEMENTSOF(table); j++)
1179                         if (i->parse == table[j].callback) {
1180                                 rvalue = table[j].rvalue;
1181                                 break;
1182                         }
1183
1184                 fprintf(f, "%s=%s\n", i->lvalue, rvalue);
1185         }
1186 }
1187
1188 static int load_from_path(Unit *u, const char *path) {
1189
1190         static const char* const section_table[_UNIT_TYPE_MAX] = {
1191                 [UNIT_SERVICE]   = "Service",
1192                 [UNIT_TIMER]     = "Timer",
1193                 [UNIT_SOCKET]    = "Socket",
1194                 [UNIT_TARGET]    = "Target",
1195                 [UNIT_DEVICE]    = "Device",
1196                 [UNIT_MOUNT]     = "Mount",
1197                 [UNIT_AUTOMOUNT] = "Automount",
1198                 [UNIT_SNAPSHOT]  = "Snapshot",
1199                 [UNIT_SWAP]      = "Swap"
1200         };
1201
1202 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1203                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1204                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1205                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1206                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1207                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1208                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1209                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1210                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1211                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1212                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1213                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1214                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1215                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1216                 { "UMask",                  config_parse_mode,            &(context).umask,                                section   }, \
1217                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1218                 { "StandardInput",          config_parse_input,           &(context).std_input,                            section   }, \
1219                 { "StandardOutput",         config_parse_output,          &(context).std_output,                           section   }, \
1220                 { "StandardError",          config_parse_output,          &(context).std_output,                           section   }, \
1221                 { "TTYPath",                config_parse_path,            &(context).tty_path,                             section   }, \
1222                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1223                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1224                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1225                 { "SyslogNoPrefix",         config_parse_bool,            &(context).syslog_no_prefix,                     section   }, \
1226                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1227                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1228                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1229                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1230                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1231                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1232                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1233                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1234                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1235                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1236                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1237                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1238                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1239                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1240                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1241                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1242                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1243                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1244                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1245                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }, \
1246                 { "ControlGroup",           config_parse_cgroup,          u,                                               section   }, \
1247                 { "ReadWriteDirectories",   config_parse_path_strv,       &(context).read_write_dirs,                      section   }, \
1248                 { "ReadOnlyDirectories",    config_parse_path_strv,       &(context).read_only_dirs,                       section   }, \
1249                 { "InaccessibleDirectories",config_parse_path_strv,       &(context).inaccessible_dirs,                    section   }, \
1250                 { "PrivateTmp",             config_parse_bool,            &(context).private_tmp,                          section   }, \
1251                 { "MountFlags",             config_parse_mount_flags,     &(context),                                      section   }
1252
1253         const ConfigItem items[] = {
1254                 { "Names",                  config_parse_names,           u,                                               "Unit"    },
1255                 { "Description",            config_parse_description,     u,                                               "Unit"    },
1256                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Unit"    },
1257                 { "RequiresOverridable",    config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES_OVERRIDABLE),          "Unit"    },
1258                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Unit"    },
1259                 { "RequisiteOverridable",   config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE_OVERRIDABLE),         "Unit"    },
1260                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Unit"    },
1261                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Unit"    },
1262                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Unit"    },
1263                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Unit"    },
1264                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Unit"    },
1265                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Unit"    },
1266
1267                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                            "Service" },
1268                 { "ExecStartPre",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_PRE,  "Service" },
1269                 { "ExecStart",              config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START,      "Service" },
1270                 { "ExecStartPost",          config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_POST, "Service" },
1271                 { "ExecReload",             config_parse_exec,            u->service.exec_command+SERVICE_EXEC_RELOAD,     "Service" },
1272                 { "ExecStop",               config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP,       "Service" },
1273                 { "ExecStopPost",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP_POST,  "Service" },
1274                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                        "Service" },
1275                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                        "Service" },
1276                 { "Type",                   config_parse_service_type,    &u->service.type,                                "Service" },
1277                 { "Restart",                config_parse_service_restart, &u->service.restart,                             "Service" },
1278                 { "PermissionsStartOnly",   config_parse_bool,            &u->service.permissions_start_only,              "Service" },
1279                 { "RootDirectoryStartOnly", config_parse_bool,            &u->service.root_directory_start_only,           "Service" },
1280                 { "ValidNoProcess",         config_parse_bool,            &u->service.valid_no_process,                    "Service" },
1281                 { "SysVStartPriority",      config_parse_sysv_priority,   &u->service.sysv_start_priority,                 "Service" },
1282                 { "KillMode",               config_parse_kill_mode,       &u->service.kill_mode,                           "Service" },
1283                 { "NonBlocking",            config_parse_bool,            &u->service.exec_context.non_blocking,           "Service" },
1284                 { "BusName",                config_parse_string,          &u->service.bus_name,                            "Service" },
1285                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1286
1287                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1288                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1289                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1290                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1291                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1292                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1293                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1294                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1295                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1296                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1297                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1298                 { "TimeoutSec",             config_parse_usec,            &u->socket.timeout_usec,                         "Socket"  },
1299                 { "DirectoryMode",          config_parse_mode,            &u->socket.directory_mode,                       "Socket"  },
1300                 { "SocketMode",             config_parse_mode,            &u->socket.socket_mode,                          "Socket"  },
1301                 { "KillMode",               config_parse_kill_mode,       &u->socket.kill_mode,                            "Socket"  },
1302                 { "Accept",                 config_parse_bool,            &u->socket.accept,                               "Socket"  },
1303                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1304
1305                 { "What",                   config_parse_string,          &u->mount.parameters_fragment.what,              "Mount"   },
1306                 { "Where",                  config_parse_path,            &u->mount.where,                                 "Mount"   },
1307                 { "Options",                config_parse_string,          &u->mount.parameters_fragment.options,           "Mount"   },
1308                 { "Type",                   config_parse_string,          &u->mount.parameters_fragment.fstype,            "Mount"   },
1309                 { "TimeoutSec",             config_parse_usec,            &u->mount.timeout_usec,                          "Mount"   },
1310                 { "KillMode",               config_parse_kill_mode,       &u->mount.kill_mode,                             "Mount"   },
1311                 EXEC_CONTEXT_CONFIG_ITEMS(u->mount.exec_context, "Mount"),
1312
1313                 { "Where",                  config_parse_path,            &u->automount.where,                             "Automount" },
1314
1315                 { "What",                   config_parse_path,            &u->swap.parameters_fragment.what,               "Swap" },
1316                 { "Priority",               config_parse_int,             &u->swap.parameters_fragment.priority,           "Swap" },
1317
1318                 { NULL, NULL, NULL, NULL }
1319         };
1320
1321 #undef EXEC_CONTEXT_CONFIG_ITEMS
1322
1323         const char *sections[3];
1324         char *k;
1325         int r;
1326         Set *symlink_names;
1327         FILE *f = NULL;
1328         char *filename = NULL, *id = NULL;
1329         Unit *merged;
1330
1331         if (!u) {
1332                 /* Dirty dirty hack. */
1333                 dump_items((FILE*) path, items);
1334                 return 0;
1335         }
1336
1337         assert(u);
1338         assert(path);
1339
1340         sections[0] = "Unit";
1341         sections[1] = section_table[u->meta.type];
1342         sections[2] = NULL;
1343
1344         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1345                 return -ENOMEM;
1346
1347         if (path_is_absolute(path)) {
1348
1349                 if (!(filename = strdup(path))) {
1350                         r = -ENOMEM;
1351                         goto finish;
1352                 }
1353
1354                 if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1355                         free(filename);
1356                         filename = NULL;
1357
1358                         if (r != -ENOENT)
1359                                 goto finish;
1360                 }
1361
1362         } else  {
1363                 char **p;
1364
1365                 STRV_FOREACH(p, u->meta.manager->unit_path) {
1366
1367                         /* Instead of opening the path right away, we manually
1368                          * follow all symlinks and add their name to our unit
1369                          * name set while doing so */
1370                         if (!(filename = path_make_absolute(path, *p))) {
1371                                 r = -ENOMEM;
1372                                 goto finish;
1373                         }
1374
1375                         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1376                                 char *sn;
1377
1378                                 free(filename);
1379                                 filename = NULL;
1380
1381                                 if (r != -ENOENT)
1382                                         goto finish;
1383
1384                                 /* Empty the symlink names for the next run */
1385                                 while ((sn = set_steal_first(symlink_names)))
1386                                         free(sn);
1387
1388                                 continue;
1389                         }
1390
1391                         break;
1392                 }
1393         }
1394
1395         if (!filename) {
1396                 r = 0;
1397                 goto finish;
1398         }
1399
1400         merged = u;
1401         if ((r = merge_by_names(&merged, symlink_names, id)) < 0)
1402                 goto finish;
1403
1404         if (merged != u) {
1405                 u->meta.load_state = UNIT_MERGED;
1406                 r = 0;
1407                 goto finish;
1408         }
1409
1410         /* Now, parse the file contents */
1411         if ((r = config_parse(filename, f, sections, items, u)) < 0)
1412                 goto finish;
1413
1414         free(u->meta.fragment_path);
1415         u->meta.fragment_path = filename;
1416         filename = NULL;
1417
1418         u->meta.load_state = UNIT_LOADED;
1419         r = 0;
1420
1421 finish:
1422         while ((k = set_steal_first(symlink_names)))
1423                 free(k);
1424
1425         set_free(symlink_names);
1426         free(filename);
1427
1428         if (f)
1429                 fclose(f);
1430
1431         return r;
1432 }
1433
1434 int unit_load_fragment(Unit *u) {
1435         int r;
1436
1437         assert(u);
1438
1439         if (u->meta.fragment_path) {
1440
1441                 if ((r = load_from_path(u, u->meta.fragment_path)) < 0)
1442                         return r;
1443
1444         } else {
1445                 Iterator i;
1446                 const char *t;
1447
1448                 /* Try to find the unit under its id */
1449                 if ((r = load_from_path(u, u->meta.id)) < 0)
1450                         return r;
1451
1452                 /* Try to find an alias we can load this with */
1453                 if (u->meta.load_state == UNIT_STUB)
1454                         SET_FOREACH(t, u->meta.names, i) {
1455
1456                                 if (t == u->meta.id)
1457                                         continue;
1458
1459                                 if ((r = load_from_path(u, t)) < 0)
1460                                         return r;
1461
1462                                 if (u->meta.load_state != UNIT_STUB)
1463                                         break;
1464                         }
1465
1466                 /* Now, follow the same logic, but look for a template */
1467                 if (u->meta.load_state == UNIT_STUB && u->meta.instance) {
1468                         char *k;
1469
1470                         if (!(k = unit_name_template(u->meta.id)))
1471                                 return -ENOMEM;
1472
1473                         r = load_from_path(u, k);
1474                         free(k);
1475
1476                         if (r < 0)
1477                                 return r;
1478
1479                         if (u->meta.load_state == UNIT_STUB)
1480                                 SET_FOREACH(t, u->meta.names, i) {
1481
1482                                         if (t == u->meta.id)
1483                                                 continue;
1484
1485                                         if (!(k = unit_name_template(t)))
1486                                                 return -ENOMEM;
1487
1488                                         r = load_from_path(u, k);
1489                                         free(k);
1490
1491                                         if (r < 0)
1492                                                 return r;
1493
1494                                         if (u->meta.load_state != UNIT_STUB)
1495                                                 break;
1496                                 }
1497                 }
1498         }
1499
1500         return 0;
1501 }
1502
1503 void unit_dump_config_items(FILE *f) {
1504         /* OK, this wins a prize for extreme ugliness. */
1505
1506         load_from_path(NULL, (const void*) f);
1507 }