src/import/import-raw.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <linux/fs.h>
   4
   5 #include "sd-daemon.h"
   6 #include "sd-event.h"
   7
   8 #include "alloc-util.h"
   9 #include "btrfs-util.h"
  10 #include "copy.h"
  11 #include "fd-util.h"
  12 #include "format-util.h"
  13 #include "fs-util.h"
  14 #include "hostname-util.h"
  15 #include "import-common.h"
  16 #include "import-compress.h"
  17 #include "import-raw.h"
  18 #include "install-file.h"
  19 #include "io-util.h"
  20 #include "machine-pool.h"
  21 #include "mkdir-label.h"
  22 #include "path-util.h"
  23 #include "qcow2-util.h"
  24 #include "ratelimit.h"
  25 #include "rm-rf.h"
  26 #include "string-util.h"
  27 #include "tmpfile-util.h"
  28 #include "util.h"
  29
  30 struct RawImport {
  31         sd_event *event;
  32
  33         char *image_root;
  34
  35         RawImportFinished on_finished;
  36         void *userdata;
  37
  38         char *local;
  39         ImportFlags flags;
  40
  41         char *temp_path;
  42         char *final_path;
  43
  44         int input_fd;
  45         int output_fd;
  46
  47         ImportCompress compress;
  48
  49         sd_event_source *input_event_source;
  50
  51         uint8_t buffer[16*1024];
  52         size_t buffer_size;
  53
  54         uint64_t written_compressed;
  55         uint64_t written_uncompressed;
  56
  57         struct stat input_stat;
  58         struct stat output_stat;
  59
  60         unsigned last_percent;
  61         RateLimit progress_ratelimit;
  62
  63         uint64_t offset;
  64         uint64_t size_max;
  65 };
  66
  67 RawImport* raw_import_unref(RawImport *i) {
  68         if (!i)
  69                 return NULL;
  70
  71         sd_event_source_unref(i->input_event_source);
  72
  73         unlink_and_free(i->temp_path);
  74
  75         import_compress_free(&i->compress);
  76
  77         sd_event_unref(i->event);
  78
  79         safe_close(i->output_fd);
  80
  81         free(i->final_path);
  82         free(i->image_root);
  83         free(i->local);
  84         return mfree(i);
  85 }
  86
  87 int raw_import_new(
  88                 RawImport **ret,
  89                 sd_event *event,
  90                 const char *image_root,
  91                 RawImportFinished on_finished,
  92                 void *userdata) {
  93
  94         _cleanup_(raw_import_unrefp) RawImport *i = NULL;
  95         _cleanup_free_ char *root = NULL;
  96         int r;
  97
  98         assert(ret);
  99
 100         root = strdup(image_root ?: "/var/lib/machines");
 101         if (!root)
 102                 return -ENOMEM;
 103
 104         i = new(RawImport, 1);
 105         if (!i)
 106                 return -ENOMEM;
 107
 108         *i = (RawImport) {
 109                 .input_fd = -1,
 110                 .output_fd = -1,
 111                 .on_finished = on_finished,
 112                 .userdata = userdata,
 113                 .last_percent = UINT_MAX,
 114                 .image_root = TAKE_PTR(root),
 115                 .progress_ratelimit = { 100 * USEC_PER_MSEC, 1 },
 116                 .offset = UINT64_MAX,
 117                 .size_max = UINT64_MAX,
 118         };
 119
 120         if (event)
 121                 i->event = sd_event_ref(event);
 122         else {
 123                 r = sd_event_default(&i->event);
 124                 if (r < 0)
 125                         return r;
 126         }
 127
 128         *ret = TAKE_PTR(i);
 129         return 0;
 130 }
 131
 132 static void raw_import_report_progress(RawImport *i) {
 133         unsigned percent;
 134         assert(i);
 135
 136         /* We have no size information, unless the source is a regular file */
 137         if (!S_ISREG(i->input_stat.st_mode))
 138                 return;
 139
 140         if (i->written_compressed >= (uint64_t) i->input_stat.st_size)
 141                 percent = 100;
 142         else
 143                 percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->input_stat.st_size);
 144
 145         if (percent == i->last_percent)
 146                 return;
 147
 148         if (!ratelimit_below(&i->progress_ratelimit))
 149                 return;
 150
 151         sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
 152         log_info("Imported %u%%.", percent);
 153
 154         i->last_percent = percent;
 155 }
 156
 157 static int raw_import_maybe_convert_qcow2(RawImport *i) {
 158         _cleanup_close_ int converted_fd = -1;
 159         _cleanup_(unlink_and_freep) char *t = NULL;
 160         _cleanup_free_ char *f = NULL;
 161         int r;
 162
 163         assert(i);
 164
 165         /* Do QCOW2 conversion if enabled and not in direct mode */
 166         if ((i->flags & (IMPORT_CONVERT_QCOW2|IMPORT_DIRECT)) != IMPORT_CONVERT_QCOW2)
 167                 return 0;
 168
 169         assert(i->final_path);
 170
 171         r = qcow2_detect(i->output_fd);
 172         if (r < 0)
 173                 return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
 174         if (r == 0)
 175                 return 0;
 176
 177         /* This is a QCOW2 image, let's convert it */
 178         r = tempfn_random(i->final_path, NULL, &f);
 179         if (r < 0)
 180                 return log_oom();
 181
 182         converted_fd = open(f, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
 183         if (converted_fd < 0)
 184                 return log_error_errno(errno, "Failed to create %s: %m", f);
 185
 186         t = TAKE_PTR(f);
 187
 188         (void) import_set_nocow_and_log(converted_fd, t);
 189
 190         log_info("Unpacking QCOW2 file.");
 191
 192         r = qcow2_convert(i->output_fd, converted_fd);
 193         if (r < 0)
 194                 return log_error_errno(r, "Failed to convert qcow2 image: %m");
 195
 196         unlink_and_free(i->temp_path);
 197         i->temp_path = TAKE_PTR(t);
 198         CLOSE_AND_REPLACE(i->output_fd, converted_fd);
 199
 200         return 1;
 201 }
 202
 203 static int raw_import_finish(RawImport *i) {
 204         int r;
 205
 206         assert(i);
 207         assert(i->output_fd >= 0);
 208
 209         /* Nothing of what is below applies to block devices */
 210         if (S_ISBLK(i->output_stat.st_mode)) {
 211
 212                 if (i->flags & IMPORT_SYNC) {
 213                         if (fsync(i->output_fd) < 0)
 214                                 return log_error_errno(errno, "Failed to synchronize block device: %m");
 215                 }
 216
 217                 return 0;
 218         }
 219
 220         assert(S_ISREG(i->output_stat.st_mode));
 221
 222         /* If an offset is specified we only are supposed to affect part of an existing output file or block
 223          * device, thus don't manipulate file properties in that case */
 224
 225         if (i->offset == UINT64_MAX) {
 226                 /* In case this was a sparse file, make sure the file size is right */
 227                 if (i->written_uncompressed > 0) {
 228                         if (ftruncate(i->output_fd, i->written_uncompressed) < 0)
 229                                 return log_error_errno(errno, "Failed to truncate file: %m");
 230                 }
 231
 232                 r = raw_import_maybe_convert_qcow2(i);
 233                 if (r < 0)
 234                         return r;
 235
 236                 if (S_ISREG(i->input_stat.st_mode)) {
 237                         (void) copy_times(i->input_fd, i->output_fd, COPY_CRTIME);
 238                         (void) copy_xattr(i->input_fd, i->output_fd, 0);
 239                 }
 240         }
 241
 242         r = install_file(AT_FDCWD, i->temp_path ?: i->local,
 243                          AT_FDCWD, i->final_path,
 244                          (i->flags & IMPORT_FORCE ? INSTALL_REPLACE : 0) |
 245                          (i->flags & IMPORT_READ_ONLY ? INSTALL_READ_ONLY : 0) |
 246                          (i->flags & IMPORT_SYNC ? INSTALL_FSYNC_FULL : 0));
 247         if (r < 0)
 248                 return log_error_errno(r, "Failed to move image into place: %m");
 249
 250         i->temp_path = mfree(i->temp_path);
 251
 252         log_info("Wrote %s.", FORMAT_BYTES(i->written_uncompressed));
 253
 254         return 0;
 255 }
 256
 257 static int raw_import_open_disk(RawImport *i) {
 258         int r;
 259
 260         assert(i);
 261         assert(i->local);
 262         assert(!i->final_path);
 263         assert(!i->temp_path);
 264         assert(i->output_fd < 0);
 265
 266         if (i->flags & IMPORT_DIRECT) {
 267                 (void) mkdir_parents_label(i->local, 0700);
 268
 269                 /* In direct mode we just open/create the local path and truncate it (like shell >
 270                  * redirection would do it) — except if an offset was passed, in which case we are supposed
 271                  * to operate on a section of the file only, in which case we apparently work on an some
 272                  * existing thing (i.e. are not the sole thing stored in the file), in which case we will
 273                  * neither truncate nor create. */
 274
 275                 i->output_fd = open(i->local, O_RDWR|O_NOCTTY|O_CLOEXEC|(i->offset == UINT64_MAX ? O_TRUNC|O_CREAT : 0), 0664);
 276                 if (i->output_fd < 0)
 277                         return log_error_errno(errno, "Failed to open destination '%s': %m", i->local);
 278
 279                 if (i->offset == UINT64_MAX)
 280                         (void) import_set_nocow_and_log(i->output_fd, i->local);
 281         } else {
 282                 i->final_path = strjoin(i->image_root, "/", i->local, ".raw");
 283                 if (!i->final_path)
 284                         return log_oom();
 285
 286                 r = tempfn_random(i->final_path, NULL, &i->temp_path);
 287                 if (r < 0)
 288                         return log_oom();
 289
 290                 (void) mkdir_parents_label(i->temp_path, 0700);
 291
 292                 i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
 293                 if (i->output_fd < 0)
 294                         return log_error_errno(errno, "Failed to open destination '%s': %m", i->temp_path);
 295
 296                 (void) import_set_nocow_and_log(i->output_fd, i->temp_path);
 297         }
 298
 299         if (fstat(i->output_fd, &i->output_stat) < 0)
 300                 return log_error_errno(errno, "Failed to stat() output file: %m");
 301
 302         if (!S_ISREG(i->output_stat.st_mode) && !S_ISBLK(i->output_stat.st_mode))
 303                 return log_error_errno(SYNTHETIC_ERRNO(EBADFD),
 304                                        "Target file is not a regular file or block device");
 305
 306         if (i->offset != UINT64_MAX) {
 307                 if (lseek(i->output_fd, i->offset, SEEK_SET) == (off_t) -1)
 308                         return log_error_errno(errno, "Failed to seek to offset: %m");
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int raw_import_try_reflink(RawImport *i) {
 315         off_t p;
 316         int r;
 317
 318         assert(i);
 319         assert(i->input_fd >= 0);
 320         assert(i->output_fd >= 0);
 321
 322         if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED)
 323                 return 0;
 324
 325         if (i->offset != UINT64_MAX || i->size_max != UINT64_MAX)
 326                 return 0;
 327
 328         if (!S_ISREG(i->input_stat.st_mode) || !S_ISREG(i->output_stat.st_mode))
 329                 return 0;
 330
 331         p = lseek(i->input_fd, 0, SEEK_CUR);
 332         if (p == (off_t) -1)
 333                 return log_error_errno(errno, "Failed to read file offset of input file: %m");
 334
 335         /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */
 336         if ((uint64_t) p != (uint64_t) i->buffer_size)
 337                 return 0;
 338
 339         r = btrfs_reflink(i->input_fd, i->output_fd);
 340         if (r >= 0)
 341                 return 1;
 342
 343         log_debug_errno(r, "Couldn't establish reflink, using copy: %m");
 344         return 0;
 345 }
 346
 347 static int raw_import_write(const void *p, size_t sz, void *userdata) {
 348         RawImport *i = ASSERT_PTR(userdata);
 349         bool too_much = false;
 350         int r;
 351
 352         assert(p);
 353         assert(sz > 0);
 354
 355         if (i->written_uncompressed >= UINT64_MAX - sz)
 356                 return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "File too large, overflow");
 357
 358         if (i->size_max != UINT64_MAX) {
 359                 if (i->written_uncompressed >= i->size_max) {
 360                         too_much = true;
 361                         goto finish;
 362                 }
 363
 364                 if (i->written_uncompressed + sz > i->size_max) {
 365                         too_much = true;
 366                         sz = i->size_max - i->written_uncompressed; /* since we have the data in memory
 367                                                                      * already, we might as well write it to
 368                                                                      * disk to the max */
 369                 }
 370         }
 371
 372         /* Generate sparse file if we created/truncated the file */
 373         if (S_ISREG(i->output_stat.st_mode) && i->offset == UINT64_MAX) {
 374                 ssize_t n;
 375
 376                 n = sparse_write(i->output_fd, p, sz, 64);
 377                 if (n < 0)
 378                         return log_error_errno((int) n, "Failed to write file: %m");
 379                 if ((size_t) n < sz)
 380                         return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write");
 381         } else {
 382                 r = loop_write(i->output_fd, p, sz, false);
 383                 if (r < 0)
 384                         return log_error_errno(r, "Failed to write file: %m");
 385         }
 386
 387         i->written_uncompressed += sz;
 388
 389 finish:
 390         if (too_much)
 391                 return log_error_errno(SYNTHETIC_ERRNO(E2BIG), "File too large");
 392
 393         return 0;
 394 }
 395
 396 static int raw_import_process(RawImport *i) {
 397         ssize_t l;
 398         int r;
 399
 400         assert(i);
 401         assert(i->buffer_size < sizeof(i->buffer));
 402
 403         l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
 404         if (l < 0) {
 405                 if (errno == EAGAIN)
 406                         return 0;
 407
 408                 r = log_error_errno(errno, "Failed to read input file: %m");
 409                 goto finish;
 410         }
 411
 412         i->buffer_size += l;
 413
 414         if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
 415
 416                 if (l == 0) { /* EOF */
 417                         log_debug("File too short to be compressed, as no compression signature fits in, thus assuming uncompressed.");
 418                         import_uncompress_force_off(&i->compress);
 419                 } else {
 420                         r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
 421                         if (r < 0) {
 422                                 log_error_errno(r, "Failed to detect file compression: %m");
 423                                 goto finish;
 424                         }
 425                         if (r == 0) /* Need more data */
 426                                 return 0;
 427                 }
 428
 429                 r = raw_import_open_disk(i);
 430                 if (r < 0)
 431                         goto finish;
 432
 433                 r = raw_import_try_reflink(i);
 434                 if (r < 0)
 435                         goto finish;
 436                 if (r > 0)
 437                         goto complete;
 438         }
 439
 440         r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i);
 441         if (r < 0) {
 442                 log_error_errno(r, "Failed to decode and write: %m");
 443                 goto finish;
 444         }
 445
 446         i->written_compressed += i->buffer_size;
 447         i->buffer_size = 0;
 448
 449         if (l == 0) /* EOF */
 450                 goto complete;
 451
 452         raw_import_report_progress(i);
 453
 454         return 0;
 455
 456 complete:
 457         r = raw_import_finish(i);
 458
 459 finish:
 460         if (i->on_finished)
 461                 i->on_finished(i, r, i->userdata);
 462         else
 463                 sd_event_exit(i->event, r);
 464
 465         return 0;
 466 }
 467
 468 static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 469         RawImport *i = userdata;
 470
 471         return raw_import_process(i);
 472 }
 473
 474 static int raw_import_on_defer(sd_event_source *s, void *userdata) {
 475         RawImport *i = userdata;
 476
 477         return raw_import_process(i);
 478 }
 479
 480 int raw_import_start(
 481                 RawImport *i,
 482                 int fd,
 483                 const char *local,
 484                 uint64_t offset,
 485                 uint64_t size_max,
 486                 ImportFlags flags) {
 487         int r;
 488
 489         assert(i);
 490         assert(fd >= 0);
 491         assert(local);
 492         assert(!(flags & ~IMPORT_FLAGS_MASK_RAW));
 493         assert(offset == UINT64_MAX || FLAGS_SET(flags, IMPORT_DIRECT));
 494
 495         if (!import_validate_local(local, flags))
 496                 return -EINVAL;
 497
 498         if (i->input_fd >= 0)
 499                 return -EBUSY;
 500
 501         r = fd_nonblock(fd, true);
 502         if (r < 0)
 503                 return r;
 504
 505         r = free_and_strdup(&i->local, local);
 506         if (r < 0)
 507                 return r;
 508
 509         i->flags = flags;
 510         i->offset = offset;
 511         i->size_max = size_max;
 512
 513         if (fstat(fd, &i->input_stat) < 0)
 514                 return -errno;
 515
 516         r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i);
 517         if (r == -EPERM) {
 518                 /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
 519                 r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i);
 520                 if (r < 0)
 521                         return r;
 522
 523                 r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);
 524         }
 525         if (r < 0)
 526                 return r;
 527
 528         i->input_fd = fd;
 529         return 0;
 530 }