src/shared/dissect-image.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sys/mount.h>
   4 #include <sys/prctl.h>
   5 #include <sys/wait.h>
   6
   7 #include "sd-device.h"
   8 #include "sd-id128.h"
   9
  10 #include "architecture.h"
  11 #include "ask-password-api.h"
  12 #include "blkid-util.h"
  13 #include "blockdev-util.h"
  14 #include "copy.h"
  15 #include "crypt-util.h"
  16 #include "def.h"
  17 #include "device-enumerator-private.h"
  18 #include "device-nodes.h"
  19 #include "dissect-image.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "fs-util.h"
  23 #include "gpt.h"
  24 #include "hexdecoct.h"
  25 #include "hostname-util.h"
  26 #include "id128-util.h"
  27 #include "linux-3.13/dm-ioctl.h"
  28 #include "missing.h"
  29 #include "mount-util.h"
  30 #include "os-util.h"
  31 #include "path-util.h"
  32 #include "process-util.h"
  33 #include "raw-clone.h"
  34 #include "signal-util.h"
  35 #include "stat-util.h"
  36 #include "stdio-util.h"
  37 #include "string-table.h"
  38 #include "string-util.h"
  39 #include "strv.h"
  40 #include "user-util.h"
  41 #include "xattr-util.h"
  42
  43 int probe_filesystem(const char *node, char **ret_fstype) {
  44         /* Try to find device content type and return it in *ret_fstype. If nothing is found,
  45          * 0/NULL will be returned. -EUCLEAN will be returned for ambigous results, and an
  46          * different error otherwise. */
  47
  48 #if HAVE_BLKID
  49         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
  50         const char *fstype;
  51         int r;
  52
  53         errno = 0;
  54         b = blkid_new_probe_from_filename(node);
  55         if (!b)
  56                 return -errno ?: -ENOMEM;
  57
  58         blkid_probe_enable_superblocks(b, 1);
  59         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
  60
  61         errno = 0;
  62         r = blkid_do_safeprobe(b);
  63         if (r == 1) {
  64                 log_debug("No type detected on partition %s", node);
  65                 goto not_found;
  66         }
  67         if (r == -2) {
  68                 log_debug("Results ambiguous for partition %s", node);
  69                 return -EUCLEAN;
  70         }
  71         if (r != 0)
  72                 return -errno ?: -EIO;
  73
  74         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
  75
  76         if (fstype) {
  77                 char *t;
  78
  79                 t = strdup(fstype);
  80                 if (!t)
  81                         return -ENOMEM;
  82
  83                 *ret_fstype = t;
  84                 return 1;
  85         }
  86
  87 not_found:
  88         *ret_fstype = NULL;
  89         return 0;
  90 #else
  91         return -EOPNOTSUPP;
  92 #endif
  93 }
  94
  95 #if HAVE_BLKID
  96 /* Detect RPMB and Boot partitions, which are not listed by blkid.
  97  * See https://github.com/systemd/systemd/issues/5806. */
  98 static bool device_is_mmc_special_partition(sd_device *d) {
  99         const char *sysname;
 100
 101         if (sd_device_get_sysname(d, &sysname) < 0)
 102                 return false;
 103
 104         return startswith(sysname, "mmcblk") &&
 105                 (endswith(sysname, "rpmb") || endswith(sysname, "boot0") || endswith(sysname, "boot1"));
 106 }
 107
 108 static bool device_is_block(sd_device *d) {
 109         const char *ss;
 110
 111         if (sd_device_get_subsystem(d, &ss) < 0)
 112                 return false;
 113
 114         return streq(ss, "block");
 115 }
 116 #endif
 117
 118 int dissect_image(
 119                 int fd,
 120                 const void *root_hash,
 121                 size_t root_hash_size,
 122                 DissectImageFlags flags,
 123                 DissectedImage **ret) {
 124
 125 #if HAVE_BLKID
 126         sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
 127         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 128         bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
 129         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 130         _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
 131         _cleanup_(blkid_free_probep) blkid_probe b = NULL;
 132         _cleanup_free_ char *generic_node = NULL;
 133         sd_id128_t generic_uuid = SD_ID128_NULL;
 134         const char *pttype = NULL;
 135         blkid_partlist pl;
 136         int r, generic_nr;
 137         struct stat st;
 138         sd_device *q;
 139         unsigned i;
 140
 141         assert(fd >= 0);
 142         assert(ret);
 143         assert(root_hash || root_hash_size == 0);
 144
 145         /* Probes a disk image, and returns information about what it found in *ret.
 146          *
 147          * Returns -ENOPKG if no suitable partition table or file system could be found.
 148          * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
 149
 150         if (root_hash) {
 151                 /* If a root hash is supplied, then we use the root partition that has a UUID that match the first
 152                  * 128bit of the root hash. And we use the verity partition that has a UUID that match the final
 153                  * 128bit. */
 154
 155                 if (root_hash_size < sizeof(sd_id128_t))
 156                         return -EINVAL;
 157
 158                 memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
 159                 memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
 160
 161                 if (sd_id128_is_null(root_uuid))
 162                         return -EINVAL;
 163                 if (sd_id128_is_null(verity_uuid))
 164                         return -EINVAL;
 165         }
 166
 167         if (fstat(fd, &st) < 0)
 168                 return -errno;
 169
 170         if (!S_ISBLK(st.st_mode))
 171                 return -ENOTBLK;
 172
 173         b = blkid_new_probe();
 174         if (!b)
 175                 return -ENOMEM;
 176
 177         errno = 0;
 178         r = blkid_probe_set_device(b, fd, 0, 0);
 179         if (r != 0)
 180                 return -errno ?: -ENOMEM;
 181
 182         if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
 183                 /* Look for file system superblocks, unless we only shall look for GPT partition tables */
 184                 blkid_probe_enable_superblocks(b, 1);
 185                 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
 186         }
 187
 188         blkid_probe_enable_partitions(b, 1);
 189         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
 190
 191         errno = 0;
 192         r = blkid_do_safeprobe(b);
 193         if (IN_SET(r, -2, 1)) {
 194                 log_debug("Failed to identify any partition table.");
 195                 return -ENOPKG;
 196         }
 197         if (r != 0)
 198                 return -errno ?: -EIO;
 199
 200         m = new0(DissectedImage, 1);
 201         if (!m)
 202                 return -ENOMEM;
 203
 204         if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
 205             (flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
 206                 const char *usage = NULL;
 207
 208                 (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
 209                 if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
 210                         _cleanup_free_ char *t = NULL, *n = NULL;
 211                         const char *fstype = NULL;
 212
 213                         /* OK, we have found a file system, that's our root partition then. */
 214                         (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 215
 216                         if (fstype) {
 217                                 t = strdup(fstype);
 218                                 if (!t)
 219                                         return -ENOMEM;
 220                         }
 221
 222                         if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0)
 223                                 return -ENOMEM;
 224
 225                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 226                                 .found = true,
 227                                 .rw = true,
 228                                 .partno = -1,
 229                                 .architecture = _ARCHITECTURE_INVALID,
 230                                 .fstype = TAKE_PTR(t),
 231                                 .node = TAKE_PTR(n),
 232                         };
 233
 234                         m->encrypted = streq(fstype, "crypto_LUKS");
 235
 236                         *ret = TAKE_PTR(m);
 237
 238                         return 0;
 239                 }
 240         }
 241
 242         (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
 243         if (!pttype)
 244                 return -ENOPKG;
 245
 246         is_gpt = streq_ptr(pttype, "gpt");
 247         is_mbr = streq_ptr(pttype, "dos");
 248
 249         if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
 250                 return -ENOPKG;
 251
 252         errno = 0;
 253         pl = blkid_probe_get_partitions(b);
 254         if (!pl)
 255                 return -errno ?: -ENOMEM;
 256
 257         r = sd_device_new_from_devnum(&d, 'b', st.st_rdev);
 258         if (r < 0)
 259                 return r;
 260
 261         for (i = 0;; i++) {
 262                 int n, z;
 263
 264                 if (i >= 10) {
 265                         log_debug("Kernel partitions never appeared.");
 266                         return -ENXIO;
 267                 }
 268
 269                 r = sd_device_enumerator_new(&e);
 270                 if (r < 0)
 271                         return r;
 272
 273                 r = sd_device_enumerator_allow_uninitialized(e);
 274                 if (r < 0)
 275                         return r;
 276
 277                 r = sd_device_enumerator_add_match_parent(e, d);
 278                 if (r < 0)
 279                         return r;
 280
 281                 r = device_enumerator_scan_devices(e);
 282                 if (r < 0)
 283                         return r;
 284
 285                 /* Count the partitions enumerated by the kernel */
 286                 n = 0;
 287                 FOREACH_DEVICE_AND_SUBSYSTEM(e, q) {
 288                         dev_t qn;
 289
 290                         if (sd_device_get_devnum(q, &qn) < 0)
 291                                 continue;
 292
 293                         if (!device_is_block(q))
 294                                 continue;
 295
 296                         if (device_is_mmc_special_partition(q))
 297                                 continue;
 298                         n++;
 299                 }
 300
 301                 /* Count the partitions enumerated by blkid */
 302                 z = blkid_partlist_numof_partitions(pl);
 303                 if (n == z + 1)
 304                         break;
 305                 if (n > z + 1) {
 306                         log_debug("blkid and kernel partition list do not match.");
 307                         return -EIO;
 308                 }
 309                 if (n < z + 1) {
 310                         unsigned j = 0;
 311
 312                         /* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
 313                          * or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
 314                          * synchronous call that waits until probing is complete. */
 315
 316                         for (;;) {
 317                                 if (j++ > 20)
 318                                         return -EBUSY;
 319
 320                                 if (ioctl(fd, BLKRRPART, 0) < 0) {
 321                                         r = -errno;
 322
 323                                         if (r == -EINVAL) {
 324                                                 struct loop_info64 info;
 325
 326                                                 /* If we are running on a loop device that has partition scanning off,
 327                                                  * return an explicit recognizable error about this, so that callers
 328                                                  * can generate a proper message explaining the situation. */
 329
 330                                                 if (ioctl(fd, LOOP_GET_STATUS64, &info) >= 0 && (info.lo_flags & LO_FLAGS_PARTSCAN) == 0) {
 331                                                         log_debug("Device is loop device and partition scanning is off!");
 332                                                         return -EPROTONOSUPPORT;
 333                                                 }
 334                                         }
 335                                         if (r != -EBUSY)
 336                                                 return r;
 337                                 } else
 338                                         break;
 339
 340                                 /* If something else has the device open, such as an udev rule, the ioctl will return
 341                                  * EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
 342                                  * bit, and try again.
 343                                  *
 344                                  * This is really something they should fix in the kernel! */
 345
 346                                 (void) usleep(50 * USEC_PER_MSEC);
 347                         }
 348                 }
 349
 350                 e = sd_device_enumerator_unref(e);
 351         }
 352
 353         FOREACH_DEVICE_AND_SUBSYSTEM(e, q) {
 354                 unsigned long long pflags;
 355                 blkid_partition pp;
 356                 const char *node;
 357                 dev_t qn;
 358                 int nr;
 359
 360                 r = sd_device_get_devnum(q, &qn);
 361                 if (r < 0)
 362                         continue;
 363
 364                 if (st.st_rdev == qn)
 365                         continue;
 366
 367                 if (!device_is_block(q))
 368                         continue;
 369
 370                 if (device_is_mmc_special_partition(q))
 371                         continue;
 372
 373                 r = sd_device_get_devname(q, &node);
 374                 if (r < 0)
 375                         continue;
 376
 377                 pp = blkid_partlist_devno_to_partition(pl, qn);
 378                 if (!pp)
 379                         continue;
 380
 381                 pflags = blkid_partition_get_flags(pp);
 382
 383                 nr = blkid_partition_get_partno(pp);
 384                 if (nr < 0)
 385                         continue;
 386
 387                 if (is_gpt) {
 388                         int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
 389                         const char *stype, *sid, *fstype = NULL;
 390                         sd_id128_t type_id, id;
 391                         bool rw = true;
 392
 393                         sid = blkid_partition_get_uuid(pp);
 394                         if (!sid)
 395                                 continue;
 396                         if (sd_id128_from_string(sid, &id) < 0)
 397                                 continue;
 398
 399                         stype = blkid_partition_get_type_string(pp);
 400                         if (!stype)
 401                                 continue;
 402                         if (sd_id128_from_string(stype, &type_id) < 0)
 403                                 continue;
 404
 405                         if (sd_id128_equal(type_id, GPT_HOME)) {
 406
 407                                 if (pflags & GPT_FLAG_NO_AUTO)
 408                                         continue;
 409
 410                                 designator = PARTITION_HOME;
 411                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 412                         } else if (sd_id128_equal(type_id, GPT_SRV)) {
 413
 414                                 if (pflags & GPT_FLAG_NO_AUTO)
 415                                         continue;
 416
 417                                 designator = PARTITION_SRV;
 418                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 419                         } else if (sd_id128_equal(type_id, GPT_ESP)) {
 420
 421                                 /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is not defined
 422                                  * there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as recommended by the
 423                                  * UEFI spec (See "12.3.3 Number and Location of System Partitions"). */
 424
 425                                 if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL)
 426                                         continue;
 427
 428                                 designator = PARTITION_ESP;
 429                                 fstype = "vfat";
 430                         }
 431 #ifdef GPT_ROOT_NATIVE
 432                         else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
 433
 434                                 if (pflags & GPT_FLAG_NO_AUTO)
 435                                         continue;
 436
 437                                 /* If a root ID is specified, ignore everything but the root id */
 438                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 439                                         continue;
 440
 441                                 designator = PARTITION_ROOT;
 442                                 architecture = native_architecture();
 443                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 444                         } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
 445
 446                                 if (pflags & GPT_FLAG_NO_AUTO)
 447                                         continue;
 448
 449                                 m->can_verity = true;
 450
 451                                 /* Ignore verity unless a root hash is specified */
 452                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 453                                         continue;
 454
 455                                 designator = PARTITION_ROOT_VERITY;
 456                                 fstype = "DM_verity_hash";
 457                                 architecture = native_architecture();
 458                                 rw = false;
 459                         }
 460 #endif
 461 #ifdef GPT_ROOT_SECONDARY
 462                         else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
 463
 464                                 if (pflags & GPT_FLAG_NO_AUTO)
 465                                         continue;
 466
 467                                 /* If a root ID is specified, ignore everything but the root id */
 468                                 if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
 469                                         continue;
 470
 471                                 designator = PARTITION_ROOT_SECONDARY;
 472                                 architecture = SECONDARY_ARCHITECTURE;
 473                                 rw = !(pflags & GPT_FLAG_READ_ONLY);
 474                         } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
 475
 476                                 if (pflags & GPT_FLAG_NO_AUTO)
 477                                         continue;
 478
 479                                 m->can_verity = true;
 480
 481                                 /* Ignore verity unless root has is specified */
 482                                 if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
 483                                         continue;
 484
 485                                 designator = PARTITION_ROOT_SECONDARY_VERITY;
 486                                 fstype = "DM_verity_hash";
 487                                 architecture = SECONDARY_ARCHITECTURE;
 488                                 rw = false;
 489                         }
 490 #endif
 491                         else if (sd_id128_equal(type_id, GPT_SWAP)) {
 492
 493                                 if (pflags & GPT_FLAG_NO_AUTO)
 494                                         continue;
 495
 496                                 designator = PARTITION_SWAP;
 497                                 fstype = "swap";
 498                         } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
 499
 500                                 if (pflags & GPT_FLAG_NO_AUTO)
 501                                         continue;
 502
 503                                 if (generic_node)
 504                                         multiple_generic = true;
 505                                 else {
 506                                         generic_nr = nr;
 507                                         generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
 508                                         generic_uuid = id;
 509                                         generic_node = strdup(node);
 510                                         if (!generic_node)
 511                                                 return -ENOMEM;
 512                                 }
 513                         }
 514
 515                         if (designator != _PARTITION_DESIGNATOR_INVALID) {
 516                                 _cleanup_free_ char *t = NULL, *n = NULL;
 517
 518                                 /* First one wins */
 519                                 if (m->partitions[designator].found)
 520                                         continue;
 521
 522                                 if (fstype) {
 523                                         t = strdup(fstype);
 524                                         if (!t)
 525                                                 return -ENOMEM;
 526                                 }
 527
 528                                 n = strdup(node);
 529                                 if (!n)
 530                                         return -ENOMEM;
 531
 532                                 m->partitions[designator] = (DissectedPartition) {
 533                                         .found = true,
 534                                         .partno = nr,
 535                                         .rw = rw,
 536                                         .architecture = architecture,
 537                                         .node = TAKE_PTR(n),
 538                                         .fstype = TAKE_PTR(t),
 539                                         .uuid = id,
 540                                 };
 541                         }
 542
 543                 } else if (is_mbr) {
 544
 545                         if (pflags != 0x80) /* Bootable flag */
 546                                 continue;
 547
 548                         if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
 549                                 continue;
 550
 551                         if (generic_node)
 552                                 multiple_generic = true;
 553                         else {
 554                                 generic_nr = nr;
 555                                 generic_rw = true;
 556                                 generic_node = strdup(node);
 557                                 if (!generic_node)
 558                                         return -ENOMEM;
 559                         }
 560                 }
 561         }
 562
 563         if (!m->partitions[PARTITION_ROOT].found) {
 564                 /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
 565                  * either, then check if there's a single generic one, and use that. */
 566
 567                 if (m->partitions[PARTITION_ROOT_VERITY].found)
 568                         return -EADDRNOTAVAIL;
 569
 570                 if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
 571                         m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
 572                         zero(m->partitions[PARTITION_ROOT_SECONDARY]);
 573
 574                         m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
 575                         zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
 576
 577                 } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
 578
 579                         /* If the root has was set, then we won't fallback to a generic node, because the root hash
 580                          * decides */
 581                         if (root_hash)
 582                                 return -EADDRNOTAVAIL;
 583
 584                         /* If we didn't find a generic node, then we can't fix this up either */
 585                         if (!generic_node)
 586                                 return -ENXIO;
 587
 588                         /* If we didn't find a properly marked root partition, but we did find a single suitable
 589                          * generic Linux partition, then use this as root partition, if the caller asked for it. */
 590                         if (multiple_generic)
 591                                 return -ENOTUNIQ;
 592
 593                         m->partitions[PARTITION_ROOT] = (DissectedPartition) {
 594                                 .found = true,
 595                                 .rw = generic_rw,
 596                                 .partno = generic_nr,
 597                                 .architecture = _ARCHITECTURE_INVALID,
 598                                 .node = TAKE_PTR(generic_node),
 599                                 .uuid = generic_uuid,
 600                         };
 601                 }
 602         }
 603
 604         if (root_hash) {
 605                 if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
 606                         return -EADDRNOTAVAIL;
 607
 608                 /* If we found the primary root with the hash, then we definitely want to suppress any secondary root
 609                  * (which would be weird, after all the root hash should only be assigned to one pair of
 610                  * partitions... */
 611                 m->partitions[PARTITION_ROOT_SECONDARY].found = false;
 612                 m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
 613
 614                 /* If we found a verity setup, then the root partition is necessarily read-only. */
 615                 m->partitions[PARTITION_ROOT].rw = false;
 616
 617                 m->verity = true;
 618         }
 619
 620         blkid_free_probe(b);
 621         b = NULL;
 622
 623         /* Fill in file system types if we don't know them yet. */
 624         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 625                 DissectedPartition *p = m->partitions + i;
 626
 627                 if (!p->found)
 628                         continue;
 629
 630                 if (!p->fstype && p->node) {
 631                         r = probe_filesystem(p->node, &p->fstype);
 632                         if (r < 0 && r != -EUCLEAN)
 633                                 return r;
 634                 }
 635
 636                 if (streq_ptr(p->fstype, "crypto_LUKS"))
 637                         m->encrypted = true;
 638
 639                 if (p->fstype && fstype_is_ro(p->fstype))
 640                         p->rw = false;
 641         }
 642
 643         *ret = TAKE_PTR(m);
 644
 645         return 0;
 646 #else
 647         return -EOPNOTSUPP;
 648 #endif
 649 }
 650
 651 DissectedImage* dissected_image_unref(DissectedImage *m) {
 652         unsigned i;
 653
 654         if (!m)
 655                 return NULL;
 656
 657         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
 658                 free(m->partitions[i].fstype);
 659                 free(m->partitions[i].node);
 660                 free(m->partitions[i].decrypted_fstype);
 661                 free(m->partitions[i].decrypted_node);
 662         }
 663
 664         free(m->hostname);
 665         strv_free(m->machine_info);
 666         strv_free(m->os_release);
 667
 668         return mfree(m);
 669 }
 670
 671 static int is_loop_device(const char *path) {
 672         char s[SYS_BLOCK_PATH_MAX("/../loop/")];
 673         struct stat st;
 674
 675         assert(path);
 676
 677         if (stat(path, &st) < 0)
 678                 return -errno;
 679
 680         if (!S_ISBLK(st.st_mode))
 681                 return -ENOTBLK;
 682
 683         xsprintf_sys_block_path(s, "/loop/", st.st_dev);
 684         if (access(s, F_OK) < 0) {
 685                 if (errno != ENOENT)
 686                         return -errno;
 687
 688                 /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
 689                 xsprintf_sys_block_path(s, "/../loop/", st.st_dev);
 690                 if (access(s, F_OK) < 0)
 691                         return errno == ENOENT ? false : -errno;
 692         }
 693
 694         return true;
 695 }
 696
 697 static int mount_partition(
 698                 DissectedPartition *m,
 699                 const char *where,
 700                 const char *directory,
 701                 uid_t uid_shift,
 702                 DissectImageFlags flags) {
 703
 704         _cleanup_free_ char *chased = NULL, *options = NULL;
 705         const char *p, *node, *fstype;
 706         bool rw;
 707         int r;
 708
 709         assert(m);
 710         assert(where);
 711
 712         node = m->decrypted_node ?: m->node;
 713         fstype = m->decrypted_fstype ?: m->fstype;
 714
 715         if (!m->found || !node || !fstype)
 716                 return 0;
 717
 718         /* Stacked encryption? Yuck */
 719         if (streq_ptr(fstype, "crypto_LUKS"))
 720                 return -ELOOP;
 721
 722         rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
 723
 724         if (directory) {
 725                 r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased);
 726                 if (r < 0)
 727                         return r;
 728
 729                 p = chased;
 730         } else
 731                 p = where;
 732
 733         /* If requested, turn on discard support. */
 734         if (fstype_can_discard(fstype) &&
 735             ((flags & DISSECT_IMAGE_DISCARD) ||
 736              ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node)))) {
 737                 options = strdup("discard");
 738                 if (!options)
 739                         return -ENOMEM;
 740         }
 741
 742         if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) {
 743                 _cleanup_free_ char *uid_option = NULL;
 744
 745                 if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0)
 746                         return -ENOMEM;
 747
 748                 if (!strextend_with_separator(&options, ",", uid_option, NULL))
 749                         return -ENOMEM;
 750         }
 751
 752         return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
 753 }
 754
 755 int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
 756         int r;
 757
 758         assert(m);
 759         assert(where);
 760
 761         if (!m->partitions[PARTITION_ROOT].found)
 762                 return -ENXIO;
 763
 764         if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) {
 765                 r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags);
 766                 if (r < 0)
 767                         return r;
 768
 769                 if (flags & DISSECT_IMAGE_VALIDATE_OS) {
 770                         r = path_is_os_tree(where);
 771                         if (r < 0)
 772                                 return r;
 773                         if (r == 0)
 774                                 return -EMEDIUMTYPE;
 775                 }
 776         }
 777
 778         if ((flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY))
 779                 return 0;
 780
 781         r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags);
 782         if (r < 0)
 783                 return r;
 784
 785         r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags);
 786         if (r < 0)
 787                 return r;
 788
 789         if (m->partitions[PARTITION_ESP].found) {
 790                 const char *mp;
 791
 792                 /* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
 793
 794                 FOREACH_STRING(mp, "/efi", "/boot") {
 795                         _cleanup_free_ char *p = NULL;
 796
 797                         r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
 798                         if (r < 0)
 799                                 continue;
 800
 801                         r = dir_is_empty(p);
 802                         if (r > 0) {
 803                                 r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
 804                                 if (r < 0)
 805                                         return r;
 806                         }
 807                 }
 808         }
 809
 810         return 0;
 811 }
 812
 813 #if HAVE_LIBCRYPTSETUP
 814 typedef struct DecryptedPartition {
 815         struct crypt_device *device;
 816         char *name;
 817         bool relinquished;
 818 } DecryptedPartition;
 819
 820 struct DecryptedImage {
 821         DecryptedPartition *decrypted;
 822         size_t n_decrypted;
 823         size_t n_allocated;
 824 };
 825 #endif
 826
 827 DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
 828 #if HAVE_LIBCRYPTSETUP
 829         size_t i;
 830         int r;
 831
 832         if (!d)
 833                 return NULL;
 834
 835         for (i = 0; i < d->n_decrypted; i++) {
 836                 DecryptedPartition *p = d->decrypted + i;
 837
 838                 if (p->device && p->name && !p->relinquished) {
 839                         r = crypt_deactivate(p->device, p->name);
 840                         if (r < 0)
 841                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
 842                 }
 843
 844                 if (p->device)
 845                         crypt_free(p->device);
 846                 free(p->name);
 847         }
 848
 849         free(d);
 850 #endif
 851         return NULL;
 852 }
 853
 854 #if HAVE_LIBCRYPTSETUP
 855
 856 static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
 857         _cleanup_free_ char *name = NULL, *node = NULL;
 858         const char *base;
 859
 860         assert(original_node);
 861         assert(suffix);
 862         assert(ret_name);
 863         assert(ret_node);
 864
 865         base = strrchr(original_node, '/');
 866         if (!base)
 867                 return -EINVAL;
 868         base++;
 869         if (isempty(base))
 870                 return -EINVAL;
 871
 872         name = strjoin(base, suffix);
 873         if (!name)
 874                 return -ENOMEM;
 875         if (!filename_is_valid(name))
 876                 return -EINVAL;
 877
 878         node = strjoin(crypt_get_dir(), "/", name);
 879         if (!node)
 880                 return -ENOMEM;
 881
 882         *ret_name = TAKE_PTR(name);
 883         *ret_node = TAKE_PTR(node);
 884
 885         return 0;
 886 }
 887
 888 static int decrypt_partition(
 889                 DissectedPartition *m,
 890                 const char *passphrase,
 891                 DissectImageFlags flags,
 892                 DecryptedImage *d) {
 893
 894         _cleanup_free_ char *node = NULL, *name = NULL;
 895         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 896         int r;
 897
 898         assert(m);
 899         assert(d);
 900
 901         if (!m->found || !m->node || !m->fstype)
 902                 return 0;
 903
 904         if (!streq(m->fstype, "crypto_LUKS"))
 905                 return 0;
 906
 907         if (!passphrase)
 908                 return -ENOKEY;
 909
 910         r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
 911         if (r < 0)
 912                 return r;
 913
 914         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 915                 return -ENOMEM;
 916
 917         r = crypt_init(&cd, m->node);
 918         if (r < 0)
 919                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 920
 921         r = crypt_load(cd, CRYPT_LUKS, NULL);
 922         if (r < 0)
 923                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 924
 925         r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
 926                                          ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
 927                                          ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
 928         if (r < 0) {
 929                 log_debug_errno(r, "Failed to activate LUKS device: %m");
 930                 return r == -EPERM ? -EKEYREJECTED : r;
 931         }
 932
 933         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 934         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 935         d->n_decrypted++;
 936
 937         m->decrypted_node = TAKE_PTR(node);
 938
 939         return 0;
 940 }
 941
 942 static int verity_partition(
 943                 DissectedPartition *m,
 944                 DissectedPartition *v,
 945                 const void *root_hash,
 946                 size_t root_hash_size,
 947                 DissectImageFlags flags,
 948                 DecryptedImage *d) {
 949
 950         _cleanup_free_ char *node = NULL, *name = NULL;
 951         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
 952         int r;
 953
 954         assert(m);
 955         assert(v);
 956
 957         if (!root_hash)
 958                 return 0;
 959
 960         if (!m->found || !m->node || !m->fstype)
 961                 return 0;
 962         if (!v->found || !v->node || !v->fstype)
 963                 return 0;
 964
 965         if (!streq(v->fstype, "DM_verity_hash"))
 966                 return 0;
 967
 968         r = make_dm_name_and_node(m->node, "-verity", &name, &node);
 969         if (r < 0)
 970                 return r;
 971
 972         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
 973                 return -ENOMEM;
 974
 975         r = crypt_init(&cd, v->node);
 976         if (r < 0)
 977                 return r;
 978
 979         r = crypt_load(cd, CRYPT_VERITY, NULL);
 980         if (r < 0)
 981                 return r;
 982
 983         r = crypt_set_data_device(cd, m->node);
 984         if (r < 0)
 985                 return r;
 986
 987         r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
 988         if (r < 0)
 989                 return r;
 990
 991         d->decrypted[d->n_decrypted].name = TAKE_PTR(name);
 992         d->decrypted[d->n_decrypted].device = TAKE_PTR(cd);
 993         d->n_decrypted++;
 994
 995         m->decrypted_node = TAKE_PTR(node);
 996
 997         return 0;
 998 }
 999 #endif
1000
1001 int dissected_image_decrypt(
1002                 DissectedImage *m,
1003                 const char *passphrase,
1004                 const void *root_hash,
1005                 size_t root_hash_size,
1006                 DissectImageFlags flags,
1007                 DecryptedImage **ret) {
1008
1009 #if HAVE_LIBCRYPTSETUP
1010         _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
1011         unsigned i;
1012         int r;
1013 #endif
1014
1015         assert(m);
1016         assert(root_hash || root_hash_size == 0);
1017
1018         /* Returns:
1019          *
1020          *      = 0           → There was nothing to decrypt
1021          *      > 0           → Decrypted successfully
1022          *      -ENOKEY       → There's something to decrypt but no key was supplied
1023          *      -EKEYREJECTED → Passed key was not correct
1024          */
1025
1026         if (root_hash && root_hash_size < sizeof(sd_id128_t))
1027                 return -EINVAL;
1028
1029         if (!m->encrypted && !m->verity) {
1030                 *ret = NULL;
1031                 return 0;
1032         }
1033
1034 #if HAVE_LIBCRYPTSETUP
1035         d = new0(DecryptedImage, 1);
1036         if (!d)
1037                 return -ENOMEM;
1038
1039         for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
1040                 DissectedPartition *p = m->partitions + i;
1041                 int k;
1042
1043                 if (!p->found)
1044                         continue;
1045
1046                 r = decrypt_partition(p, passphrase, flags, d);
1047                 if (r < 0)
1048                         return r;
1049
1050                 k = PARTITION_VERITY_OF(i);
1051                 if (k >= 0) {
1052                         r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
1053                         if (r < 0)
1054                                 return r;
1055                 }
1056
1057                 if (!p->decrypted_fstype && p->decrypted_node) {
1058                         r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
1059                         if (r < 0 && r != -EUCLEAN)
1060                                 return r;
1061                 }
1062         }
1063
1064         *ret = TAKE_PTR(d);
1065
1066         return 1;
1067 #else
1068         return -EOPNOTSUPP;
1069 #endif
1070 }
1071
1072 int dissected_image_decrypt_interactively(
1073                 DissectedImage *m,
1074                 const char *passphrase,
1075                 const void *root_hash,
1076                 size_t root_hash_size,
1077                 DissectImageFlags flags,
1078                 DecryptedImage **ret) {
1079
1080         _cleanup_strv_free_erase_ char **z = NULL;
1081         int n = 3, r;
1082
1083         if (passphrase)
1084                 n--;
1085
1086         for (;;) {
1087                 r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
1088                 if (r >= 0)
1089                         return r;
1090                 if (r == -EKEYREJECTED)
1091                         log_error_errno(r, "Incorrect passphrase, try again!");
1092                 else if (r != -ENOKEY)
1093                         return log_error_errno(r, "Failed to decrypt image: %m");
1094
1095                 if (--n < 0) {
1096                         log_error("Too many retries.");
1097                         return -EKEYREJECTED;
1098                 }
1099
1100                 z = strv_free(z);
1101
1102                 r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
1103                 if (r < 0)
1104                         return log_error_errno(r, "Failed to query for passphrase: %m");
1105
1106                 passphrase = z[0];
1107         }
1108 }
1109
1110 #if HAVE_LIBCRYPTSETUP
1111 static int deferred_remove(DecryptedPartition *p) {
1112
1113         struct dm_ioctl dm = {
1114                 .version = {
1115                         DM_VERSION_MAJOR,
1116                         DM_VERSION_MINOR,
1117                         DM_VERSION_PATCHLEVEL
1118                 },
1119                 .data_size = sizeof(dm),
1120                 .flags = DM_DEFERRED_REMOVE,
1121         };
1122
1123         _cleanup_close_ int fd = -1;
1124
1125         assert(p);
1126
1127         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
1128
1129         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
1130         if (fd < 0)
1131                 return -errno;
1132
1133         strncpy(dm.name, p->name, sizeof(dm.name));
1134
1135         if (ioctl(fd, DM_DEV_REMOVE, &dm))
1136                 return -errno;
1137
1138         return 0;
1139 }
1140 #endif
1141
1142 int decrypted_image_relinquish(DecryptedImage *d) {
1143
1144 #if HAVE_LIBCRYPTSETUP
1145         size_t i;
1146         int r;
1147 #endif
1148
1149         assert(d);
1150
1151         /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
1152          * that we don't clean it up ourselves either anymore */
1153
1154 #if HAVE_LIBCRYPTSETUP
1155         for (i = 0; i < d->n_decrypted; i++) {
1156                 DecryptedPartition *p = d->decrypted + i;
1157
1158                 if (p->relinquished)
1159                         continue;
1160
1161                 r = deferred_remove(p);
1162                 if (r < 0)
1163                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
1164
1165                 p->relinquished = true;
1166         }
1167 #endif
1168
1169         return 0;
1170 }
1171
1172 int root_hash_load(const char *image, void **ret, size_t *ret_size) {
1173         _cleanup_free_ char *text = NULL;
1174         _cleanup_free_ void *k = NULL;
1175         size_t l;
1176         int r;
1177
1178         assert(image);
1179         assert(ret);
1180         assert(ret_size);
1181
1182         if (is_device_path(image)) {
1183                 /* If we are asked to load the root hash for a device node, exit early */
1184                 *ret = NULL;
1185                 *ret_size = 0;
1186                 return 0;
1187         }
1188
1189         r = getxattr_malloc(image, "user.verity.roothash", &text, true);
1190         if (r < 0) {
1191                 char *fn, *e, *n;
1192
1193                 if (!IN_SET(r, -ENODATA, -EOPNOTSUPP, -ENOENT))
1194                         return r;
1195
1196                 fn = newa(char, strlen(image) + STRLEN(".roothash") + 1);
1197                 n = stpcpy(fn, image);
1198                 e = endswith(fn, ".raw");
1199                 if (e)
1200                         n = e;
1201
1202                 strcpy(n, ".roothash");
1203
1204                 r = read_one_line_file(fn, &text);
1205                 if (r == -ENOENT) {
1206                         *ret = NULL;
1207                         *ret_size = 0;
1208                         return 0;
1209                 }
1210                 if (r < 0)
1211                         return r;
1212         }
1213
1214         r = unhexmem(text, strlen(text), &k, &l);
1215         if (r < 0)
1216                 return r;
1217         if (l < sizeof(sd_id128_t))
1218                 return -EINVAL;
1219
1220         *ret = TAKE_PTR(k);
1221         *ret_size = l;
1222
1223         return 1;
1224 }
1225
1226 int dissected_image_acquire_metadata(DissectedImage *m) {
1227
1228         enum {
1229                 META_HOSTNAME,
1230                 META_MACHINE_ID,
1231                 META_MACHINE_INFO,
1232                 META_OS_RELEASE,
1233                 _META_MAX,
1234         };
1235
1236         static const char *const paths[_META_MAX] = {
1237                 [META_HOSTNAME]     = "/etc/hostname\0",
1238                 [META_MACHINE_ID]   = "/etc/machine-id\0",
1239                 [META_MACHINE_INFO] = "/etc/machine-info\0",
1240                 [META_OS_RELEASE]   = "/etc/os-release\0/usr/lib/os-release\0",
1241         };
1242
1243         _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL;
1244         _cleanup_(rmdir_and_freep) char *t = NULL;
1245         _cleanup_(sigkill_waitp) pid_t child = 0;
1246         sd_id128_t machine_id = SD_ID128_NULL;
1247         _cleanup_free_ char *hostname = NULL;
1248         unsigned n_meta_initialized = 0, k;
1249         int fds[2 * _META_MAX], r;
1250
1251         BLOCK_SIGNALS(SIGCHLD);
1252
1253         assert(m);
1254
1255         for (; n_meta_initialized < _META_MAX; n_meta_initialized ++)
1256                 if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) {
1257                         r = -errno;
1258                         goto finish;
1259                 }
1260
1261         r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t);
1262         if (r < 0)
1263                 goto finish;
1264
1265         r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child);
1266         if (r < 0)
1267                 goto finish;
1268         if (r == 0) {
1269                 r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS);
1270                 if (r < 0) {
1271                         log_debug_errno(r, "Failed to mount dissected image: %m");
1272                         _exit(EXIT_FAILURE);
1273                 }
1274
1275                 for (k = 0; k < _META_MAX; k++) {
1276                         _cleanup_close_ int fd = -1;
1277                         const char *p;
1278
1279                         fds[2*k] = safe_close(fds[2*k]);
1280
1281                         NULSTR_FOREACH(p, paths[k]) {
1282                                 fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
1283                                 if (fd >= 0)
1284                                         break;
1285                         }
1286                         if (fd < 0) {
1287                                 log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]);
1288                                 continue;
1289                         }
1290
1291                         r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0);
1292                         if (r < 0)
1293                                 _exit(EXIT_FAILURE);
1294
1295                         fds[2*k+1] = safe_close(fds[2*k+1]);
1296                 }
1297
1298                 _exit(EXIT_SUCCESS);
1299         }
1300
1301         for (k = 0; k < _META_MAX; k++) {
1302                 _cleanup_fclose_ FILE *f = NULL;
1303
1304                 fds[2*k+1] = safe_close(fds[2*k+1]);
1305
1306                 f = fdopen(fds[2*k], "re");
1307                 if (!f) {
1308                         r = -errno;
1309                         goto finish;
1310                 }
1311
1312                 fds[2*k] = -1;
1313
1314                 switch (k) {
1315
1316                 case META_HOSTNAME:
1317                         r = read_etc_hostname_stream(f, &hostname);
1318                         if (r < 0)
1319                                 log_debug_errno(r, "Failed to read /etc/hostname: %m");
1320
1321                         break;
1322
1323                 case META_MACHINE_ID: {
1324                         _cleanup_free_ char *line = NULL;
1325
1326                         r = read_line(f, LONG_LINE_MAX, &line);
1327                         if (r < 0)
1328                                 log_debug_errno(r, "Failed to read /etc/machine-id: %m");
1329                         else if (r == 33) {
1330                                 r = sd_id128_from_string(line, &machine_id);
1331                                 if (r < 0)
1332                                         log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line);
1333                         } else if (r == 0)
1334                                 log_debug("/etc/machine-id file is empty.");
1335                         else
1336                                 log_debug("/etc/machine-id has unexpected length %i.", r);
1337
1338                         break;
1339                 }
1340
1341                 case META_MACHINE_INFO:
1342                         r = load_env_file_pairs(f, "machine-info", NULL, &machine_info);
1343                         if (r < 0)
1344                                 log_debug_errno(r, "Failed to read /etc/machine-info: %m");
1345
1346                         break;
1347
1348                 case META_OS_RELEASE:
1349                         r = load_env_file_pairs(f, "os-release", NULL, &os_release);
1350                         if (r < 0)
1351                                 log_debug_errno(r, "Failed to read OS release file: %m");
1352
1353                         break;
1354                 }
1355         }
1356
1357         r = wait_for_terminate_and_check("(sd-dissect)", child, 0);
1358         child = 0;
1359         if (r < 0)
1360                 goto finish;
1361         if (r != EXIT_SUCCESS)
1362                 return -EPROTO;
1363
1364         free_and_replace(m->hostname, hostname);
1365         m->machine_id = machine_id;
1366         strv_free_and_replace(m->machine_info, machine_info);
1367         strv_free_and_replace(m->os_release, os_release);
1368
1369 finish:
1370         for (k = 0; k < n_meta_initialized; k++)
1371                 safe_close_pair(fds + 2*k);
1372
1373         return r;
1374 }
1375
1376 int dissect_image_and_warn(
1377                 int fd,
1378                 const char *name,
1379                 const void *root_hash,
1380                 size_t root_hash_size,
1381                 DissectImageFlags flags,
1382                 DissectedImage **ret) {
1383
1384         _cleanup_free_ char *buffer = NULL;
1385         int r;
1386
1387         if (!name) {
1388                 r = fd_get_path(fd, &buffer);
1389                 if (r < 0)
1390                         return r;
1391
1392                 name = buffer;
1393         }
1394
1395         r = dissect_image(fd, root_hash, root_hash_size, flags, ret);
1396
1397         switch (r) {
1398
1399         case -EOPNOTSUPP:
1400                 return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support.");
1401
1402         case -ENOPKG:
1403                 return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name);
1404
1405         case -EADDRNOTAVAIL:
1406                 return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name);
1407
1408         case -ENOTUNIQ:
1409                 return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name);
1410
1411         case -ENXIO:
1412                 return log_error_errno(r, "No suitable root partition found in image '%s'.", name);
1413
1414         case -EPROTONOSUPPORT:
1415                 return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name);
1416
1417         default:
1418                 if (r < 0)
1419                         return log_error_errno(r, "Failed to dissect image '%s': %m", name);
1420
1421                 return r;
1422         }
1423 }
1424
1425 static const char *const partition_designator_table[] = {
1426         [PARTITION_ROOT] = "root",
1427         [PARTITION_ROOT_SECONDARY] = "root-secondary",
1428         [PARTITION_HOME] = "home",
1429         [PARTITION_SRV] = "srv",
1430         [PARTITION_ESP] = "esp",
1431         [PARTITION_SWAP] = "swap",
1432         [PARTITION_ROOT_VERITY] = "root-verity",
1433         [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
1434 };
1435
1436 DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);