src/import/import-raw.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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 "chattr-util.h"
  11 #include "copy.h"
  12 #include "fd-util.h"
  13 #include "fileio.h"
  14 #include "fs-util.h"
  15 #include "hostname-util.h"
  16 #include "import-common.h"
  17 #include "import-compress.h"
  18 #include "import-raw.h"
  19 #include "io-util.h"
  20 #include "machine-pool.h"
  21 #include "mkdir.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 "util.h"
  28
  29 struct RawImport {
  30         sd_event *event;
  31
  32         char *image_root;
  33
  34         RawImportFinished on_finished;
  35         void *userdata;
  36
  37         char *local;
  38         bool force_local;
  39         bool read_only;
  40         bool grow_machine_directory;
  41
  42         char *temp_path;
  43         char *final_path;
  44
  45         int input_fd;
  46         int output_fd;
  47
  48         ImportCompress compress;
  49
  50         uint64_t written_since_last_grow;
  51
  52         sd_event_source *input_event_source;
  53
  54         uint8_t buffer[16*1024];
  55         size_t buffer_size;
  56
  57         uint64_t written_compressed;
  58         uint64_t written_uncompressed;
  59
  60         struct stat st;
  61
  62         unsigned last_percent;
  63         RateLimit progress_rate_limit;
  64 };
  65
  66 RawImport* raw_import_unref(RawImport *i) {
  67         if (!i)
  68                 return NULL;
  69
  70         sd_event_unref(i->event);
  71
  72         if (i->temp_path) {
  73                 (void) unlink(i->temp_path);
  74                 free(i->temp_path);
  75         }
  76
  77         import_compress_free(&i->compress);
  78
  79         sd_event_source_unref(i->input_event_source);
  80
  81         safe_close(i->output_fd);
  82
  83         free(i->final_path);
  84         free(i->image_root);
  85         free(i->local);
  86         return mfree(i);
  87 }
  88
  89 int raw_import_new(
  90                 RawImport **ret,
  91                 sd_event *event,
  92                 const char *image_root,
  93                 RawImportFinished on_finished,
  94                 void *userdata) {
  95
  96         _cleanup_(raw_import_unrefp) RawImport *i = NULL;
  97         int r;
  98
  99         assert(ret);
 100
 101         i = new0(RawImport, 1);
 102         if (!i)
 103                 return -ENOMEM;
 104
 105         i->input_fd = i->output_fd = -1;
 106         i->on_finished = on_finished;
 107         i->userdata = userdata;
 108
 109         RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
 110         i->last_percent = (unsigned) -1;
 111
 112         i->image_root = strdup(image_root ?: "/var/lib/machines");
 113         if (!i->image_root)
 114                 return -ENOMEM;
 115
 116         i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");
 117
 118         if (event)
 119                 i->event = sd_event_ref(event);
 120         else {
 121                 r = sd_event_default(&i->event);
 122                 if (r < 0)
 123                         return r;
 124         }
 125
 126         *ret = TAKE_PTR(i);
 127
 128         return 0;
 129 }
 130
 131 static void raw_import_report_progress(RawImport *i) {
 132         unsigned percent;
 133         assert(i);
 134
 135         /* We have no size information, unless the source is a regular file */
 136         if (!S_ISREG(i->st.st_mode))
 137                 return;
 138
 139         if (i->written_compressed >= (uint64_t) i->st.st_size)
 140                 percent = 100;
 141         else
 142                 percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size);
 143
 144         if (percent == i->last_percent)
 145                 return;
 146
 147         if (!ratelimit_below(&i->progress_rate_limit))
 148                 return;
 149
 150         sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
 151         log_info("Imported %u%%.", percent);
 152
 153         i->last_percent = percent;
 154 }
 155
 156 static int raw_import_maybe_convert_qcow2(RawImport *i) {
 157         _cleanup_close_ int converted_fd = -1;
 158         _cleanup_free_ char *t = NULL;
 159         int r;
 160
 161         assert(i);
 162
 163         r = qcow2_detect(i->output_fd);
 164         if (r < 0)
 165                 return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
 166         if (r == 0)
 167                 return 0;
 168
 169         /* This is a QCOW2 image, let's convert it */
 170         r = tempfn_random(i->final_path, NULL, &t);
 171         if (r < 0)
 172                 return log_oom();
 173
 174         converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
 175         if (converted_fd < 0)
 176                 return log_error_errno(errno, "Failed to create %s: %m", t);
 177
 178         r = chattr_fd(converted_fd, FS_NOCOW_FL, FS_NOCOW_FL, NULL);
 179         if (r < 0)
 180                 log_warning_errno(r, "Failed to set file attributes on %s: %m", t);
 181
 182         log_info("Unpacking QCOW2 file.");
 183
 184         r = qcow2_convert(i->output_fd, converted_fd);
 185         if (r < 0) {
 186                 unlink(t);
 187                 return log_error_errno(r, "Failed to convert qcow2 image: %m");
 188         }
 189
 190         (void) unlink(i->temp_path);
 191         free_and_replace(i->temp_path, t);
 192
 193         safe_close(i->output_fd);
 194         i->output_fd = TAKE_FD(converted_fd);
 195
 196         return 1;
 197 }
 198
 199 static int raw_import_finish(RawImport *i) {
 200         int r;
 201
 202         assert(i);
 203         assert(i->output_fd >= 0);
 204         assert(i->temp_path);
 205         assert(i->final_path);
 206
 207         /* In case this was a sparse file, make sure the file system is right */
 208         if (i->written_uncompressed > 0) {
 209                 if (ftruncate(i->output_fd, i->written_uncompressed) < 0)
 210                         return log_error_errno(errno, "Failed to truncate file: %m");
 211         }
 212
 213         r = raw_import_maybe_convert_qcow2(i);
 214         if (r < 0)
 215                 return r;
 216
 217         if (S_ISREG(i->st.st_mode)) {
 218                 (void) copy_times(i->input_fd, i->output_fd);
 219                 (void) copy_xattr(i->input_fd, i->output_fd);
 220         }
 221
 222         if (i->read_only) {
 223                 r = import_make_read_only_fd(i->output_fd);
 224                 if (r < 0)
 225                         return r;
 226         }
 227
 228         if (i->force_local)
 229                 (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
 230
 231         r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);
 232         if (r < 0)
 233                 return log_error_errno(r, "Failed to move image into place: %m");
 234
 235         i->temp_path = mfree(i->temp_path);
 236
 237         return 0;
 238 }
 239
 240 static int raw_import_open_disk(RawImport *i) {
 241         int r;
 242
 243         assert(i);
 244
 245         assert(!i->final_path);
 246         assert(!i->temp_path);
 247         assert(i->output_fd < 0);
 248
 249         i->final_path = strjoin(i->image_root, "/", i->local, ".raw");
 250         if (!i->final_path)
 251                 return log_oom();
 252
 253         r = tempfn_random(i->final_path, NULL, &i->temp_path);
 254         if (r < 0)
 255                 return log_oom();
 256
 257         (void) mkdir_parents_label(i->temp_path, 0700);
 258
 259         i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
 260         if (i->output_fd < 0)
 261                 return log_error_errno(errno, "Failed to open destination %s: %m", i->temp_path);
 262
 263         r = chattr_fd(i->output_fd, FS_NOCOW_FL, FS_NOCOW_FL, NULL);
 264         if (r < 0)
 265                 log_warning_errno(r, "Failed to set file attributes on %s: %m", i->temp_path);
 266
 267         return 0;
 268 }
 269
 270 static int raw_import_try_reflink(RawImport *i) {
 271         off_t p;
 272         int r;
 273
 274         assert(i);
 275         assert(i->input_fd >= 0);
 276         assert(i->output_fd >= 0);
 277
 278         if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED)
 279                 return 0;
 280
 281         if (!S_ISREG(i->st.st_mode))
 282                 return 0;
 283
 284         p = lseek(i->input_fd, 0, SEEK_CUR);
 285         if (p == (off_t) -1)
 286                 return log_error_errno(errno, "Failed to read file offset of input file: %m");
 287
 288         /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */
 289         if ((uint64_t) p != (uint64_t) i->buffer_size)
 290                 return 0;
 291
 292         r = btrfs_reflink(i->input_fd, i->output_fd);
 293         if (r >= 0)
 294                 return 1;
 295
 296         return 0;
 297 }
 298
 299 static int raw_import_write(const void *p, size_t sz, void *userdata) {
 300         RawImport *i = userdata;
 301         ssize_t n;
 302
 303         if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) {
 304                 i->written_since_last_grow = 0;
 305                 grow_machine_directory();
 306         }
 307
 308         n = sparse_write(i->output_fd, p, sz, 64);
 309         if (n < 0)
 310                 return (int) n;
 311         if ((size_t) n < sz)
 312                 return -EIO;
 313
 314         i->written_uncompressed += sz;
 315         i->written_since_last_grow += sz;
 316
 317         return 0;
 318 }
 319
 320 static int raw_import_process(RawImport *i) {
 321         ssize_t l;
 322         int r;
 323
 324         assert(i);
 325         assert(i->buffer_size < sizeof(i->buffer));
 326
 327         l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
 328         if (l < 0) {
 329                 if (errno == EAGAIN)
 330                         return 0;
 331
 332                 r = log_error_errno(errno, "Failed to read input file: %m");
 333                 goto finish;
 334         }
 335         if (l == 0) {
 336                 if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
 337                         log_error("Premature end of file.");
 338                         r = -EIO;
 339                         goto finish;
 340                 }
 341
 342                 r = raw_import_finish(i);
 343                 goto finish;
 344         }
 345
 346         i->buffer_size += l;
 347
 348         if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
 349                 r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
 350                 if (r < 0) {
 351                         log_error_errno(r, "Failed to detect file compression: %m");
 352                         goto finish;
 353                 }
 354                 if (r == 0) /* Need more data */
 355                         return 0;
 356
 357                 r = raw_import_open_disk(i);
 358                 if (r < 0)
 359                         goto finish;
 360
 361                 r = raw_import_try_reflink(i);
 362                 if (r < 0)
 363                         goto finish;
 364                 if (r > 0) {
 365                         r = raw_import_finish(i);
 366                         goto finish;
 367                 }
 368         }
 369
 370         r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i);
 371         if (r < 0) {
 372                 log_error_errno(r, "Failed to decode and write: %m");
 373                 goto finish;
 374         }
 375
 376         i->written_compressed += i->buffer_size;
 377         i->buffer_size = 0;
 378
 379         raw_import_report_progress(i);
 380
 381         return 0;
 382
 383 finish:
 384         if (i->on_finished)
 385                 i->on_finished(i, r, i->userdata);
 386         else
 387                 sd_event_exit(i->event, r);
 388
 389         return 0;
 390 }
 391
 392 static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 393         RawImport *i = userdata;
 394
 395         return raw_import_process(i);
 396 }
 397
 398 static int raw_import_on_defer(sd_event_source *s, void *userdata) {
 399         RawImport *i = userdata;
 400
 401         return raw_import_process(i);
 402 }
 403
 404 int raw_import_start(RawImport *i, int fd, const char *local, bool force_local, bool read_only) {
 405         int r;
 406
 407         assert(i);
 408         assert(fd >= 0);
 409         assert(local);
 410
 411         if (!machine_name_is_valid(local))
 412                 return -EINVAL;
 413
 414         if (i->input_fd >= 0)
 415                 return -EBUSY;
 416
 417         r = fd_nonblock(fd, true);
 418         if (r < 0)
 419                 return r;
 420
 421         r = free_and_strdup(&i->local, local);
 422         if (r < 0)
 423                 return r;
 424         i->force_local = force_local;
 425         i->read_only = read_only;
 426
 427         if (fstat(fd, &i->st) < 0)
 428                 return -errno;
 429
 430         r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i);
 431         if (r == -EPERM) {
 432                 /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
 433                 r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i);
 434                 if (r < 0)
 435                         return r;
 436
 437                 r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);
 438         }
 439         if (r < 0)
 440                 return r;
 441
 442         i->input_fd = fd;
 443         return r;
 444 }