summaryrefslogtreecommitdiffstats
path: root/src/import/import-raw.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/import/import-raw.c')
-rw-r--r--src/import/import-raw.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/src/import/import-raw.c b/src/import/import-raw.c
new file mode 100644
index 0000000..f7ed163
--- /dev/null
+++ b/src/import/import-raw.c
@@ -0,0 +1,529 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <linux/fs.h>
+
+#include "sd-daemon.h"
+#include "sd-event.h"
+
+#include "alloc-util.h"
+#include "btrfs-util.h"
+#include "copy.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "hostname-util.h"
+#include "import-common.h"
+#include "import-compress.h"
+#include "import-raw.h"
+#include "install-file.h"
+#include "io-util.h"
+#include "machine-pool.h"
+#include "mkdir-label.h"
+#include "path-util.h"
+#include "qcow2-util.h"
+#include "ratelimit.h"
+#include "rm-rf.h"
+#include "string-util.h"
+#include "tmpfile-util.h"
+
+struct RawImport {
+ sd_event *event;
+
+ char *image_root;
+
+ RawImportFinished on_finished;
+ void *userdata;
+
+ char *local;
+ ImportFlags flags;
+
+ char *temp_path;
+ char *final_path;
+
+ int input_fd;
+ int output_fd;
+
+ ImportCompress compress;
+
+ sd_event_source *input_event_source;
+
+ uint8_t buffer[16*1024];
+ size_t buffer_size;
+
+ uint64_t written_compressed;
+ uint64_t written_uncompressed;
+
+ struct stat input_stat;
+ struct stat output_stat;
+
+ unsigned last_percent;
+ RateLimit progress_ratelimit;
+
+ uint64_t offset;
+ uint64_t size_max;
+};
+
+RawImport* raw_import_unref(RawImport *i) {
+ if (!i)
+ return NULL;
+
+ sd_event_source_unref(i->input_event_source);
+
+ unlink_and_free(i->temp_path);
+
+ import_compress_free(&i->compress);
+
+ sd_event_unref(i->event);
+
+ safe_close(i->output_fd);
+
+ free(i->final_path);
+ free(i->image_root);
+ free(i->local);
+ return mfree(i);
+}
+
+int raw_import_new(
+ RawImport **ret,
+ sd_event *event,
+ const char *image_root,
+ RawImportFinished on_finished,
+ void *userdata) {
+
+ _cleanup_(raw_import_unrefp) RawImport *i = NULL;
+ _cleanup_free_ char *root = NULL;
+ int r;
+
+ assert(ret);
+
+ root = strdup(image_root ?: "/var/lib/machines");
+ if (!root)
+ return -ENOMEM;
+
+ i = new(RawImport, 1);
+ if (!i)
+ return -ENOMEM;
+
+ *i = (RawImport) {
+ .input_fd = -EBADF,
+ .output_fd = -EBADF,
+ .on_finished = on_finished,
+ .userdata = userdata,
+ .last_percent = UINT_MAX,
+ .image_root = TAKE_PTR(root),
+ .progress_ratelimit = { 100 * USEC_PER_MSEC, 1 },
+ .offset = UINT64_MAX,
+ .size_max = UINT64_MAX,
+ };
+
+ if (event)
+ i->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&i->event);
+ if (r < 0)
+ return r;
+ }
+
+ *ret = TAKE_PTR(i);
+ return 0;
+}
+
+static void raw_import_report_progress(RawImport *i) {
+ unsigned percent;
+ assert(i);
+
+ /* We have no size information, unless the source is a regular file */
+ if (!S_ISREG(i->input_stat.st_mode))
+ return;
+
+ if (i->written_compressed >= (uint64_t) i->input_stat.st_size)
+ percent = 100;
+ else
+ percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->input_stat.st_size);
+
+ if (percent == i->last_percent)
+ return;
+
+ if (!ratelimit_below(&i->progress_ratelimit))
+ return;
+
+ sd_notifyf(false, "X_IMPORT_PROGRESS=%u%%", percent);
+ log_info("Imported %u%%.", percent);
+
+ i->last_percent = percent;
+}
+
+static int raw_import_maybe_convert_qcow2(RawImport *i) {
+ _cleanup_close_ int converted_fd = -EBADF;
+ _cleanup_(unlink_and_freep) char *t = NULL;
+ _cleanup_free_ char *f = NULL;
+ int r;
+
+ assert(i);
+
+ /* Do QCOW2 conversion if enabled and not in direct mode */
+ if ((i->flags & (IMPORT_CONVERT_QCOW2|IMPORT_DIRECT)) != IMPORT_CONVERT_QCOW2)
+ return 0;
+
+ assert(i->final_path);
+
+ r = qcow2_detect(i->output_fd);
+ if (r < 0)
+ return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
+ if (r == 0)
+ return 0;
+
+ /* This is a QCOW2 image, let's convert it */
+ r = tempfn_random(i->final_path, NULL, &f);
+ if (r < 0)
+ return log_oom();
+
+ converted_fd = open(f, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+ if (converted_fd < 0)
+ return log_error_errno(errno, "Failed to create %s: %m", f);
+
+ t = TAKE_PTR(f);
+
+ (void) import_set_nocow_and_log(converted_fd, t);
+
+ log_info("Unpacking QCOW2 file.");
+
+ r = qcow2_convert(i->output_fd, converted_fd);
+ if (r < 0)
+ return log_error_errno(r, "Failed to convert qcow2 image: %m");
+
+ unlink_and_free(i->temp_path);
+ i->temp_path = TAKE_PTR(t);
+ close_and_replace(i->output_fd, converted_fd);
+
+ return 1;
+}
+
+static int raw_import_finish(RawImport *i) {
+ int r;
+
+ assert(i);
+ assert(i->output_fd >= 0);
+
+ /* Nothing of what is below applies to block devices */
+ if (S_ISBLK(i->output_stat.st_mode)) {
+
+ if (i->flags & IMPORT_SYNC) {
+ if (fsync(i->output_fd) < 0)
+ return log_error_errno(errno, "Failed to synchronize block device: %m");
+ }
+
+ return 0;
+ }
+
+ assert(S_ISREG(i->output_stat.st_mode));
+
+ /* If an offset is specified we only are supposed to affect part of an existing output file or block
+ * device, thus don't manipulate file properties in that case */
+
+ if (i->offset == UINT64_MAX) {
+ /* In case this was a sparse file, make sure the file size is right */
+ if (i->written_uncompressed > 0) {
+ if (ftruncate(i->output_fd, i->written_uncompressed) < 0)
+ return log_error_errno(errno, "Failed to truncate file: %m");
+ }
+
+ r = raw_import_maybe_convert_qcow2(i);
+ if (r < 0)
+ return r;
+
+ if (S_ISREG(i->input_stat.st_mode)) {
+ (void) copy_times(i->input_fd, i->output_fd, COPY_CRTIME);
+ (void) copy_xattr(i->input_fd, NULL, i->output_fd, NULL, 0);
+ }
+ }
+
+ r = install_file(AT_FDCWD, i->temp_path ?: i->local,
+ AT_FDCWD, i->final_path,
+ (i->flags & IMPORT_FORCE ? INSTALL_REPLACE : 0) |
+ (i->flags & IMPORT_READ_ONLY ? INSTALL_READ_ONLY : 0) |
+ (i->flags & IMPORT_SYNC ? INSTALL_FSYNC_FULL : 0));
+ if (r < 0)
+ return log_error_errno(r, "Failed to move image into place: %m");
+
+ i->temp_path = mfree(i->temp_path);
+
+ log_info("Wrote %s.", FORMAT_BYTES(i->written_uncompressed));
+
+ return 0;
+}
+
+static int raw_import_open_disk(RawImport *i) {
+ int r;
+
+ assert(i);
+ assert(i->local);
+ assert(!i->final_path);
+ assert(!i->temp_path);
+ assert(i->output_fd < 0);
+
+ if (i->flags & IMPORT_DIRECT) {
+ (void) mkdir_parents_label(i->local, 0700);
+
+ /* In direct mode we just open/create the local path and truncate it (like shell >
+ * redirection would do it) — except if an offset was passed, in which case we are supposed
+ * to operate on a section of the file only, in which case we apparently work on an some
+ * existing thing (i.e. are not the sole thing stored in the file), in which case we will
+ * neither truncate nor create. */
+
+ i->output_fd = open(i->local, O_RDWR|O_NOCTTY|O_CLOEXEC|(i->offset == UINT64_MAX ? O_TRUNC|O_CREAT : 0), 0664);
+ if (i->output_fd < 0)
+ return log_error_errno(errno, "Failed to open destination '%s': %m", i->local);
+
+ if (i->offset == UINT64_MAX)
+ (void) import_set_nocow_and_log(i->output_fd, i->local);
+ } else {
+ i->final_path = strjoin(i->image_root, "/", i->local, ".raw");
+ if (!i->final_path)
+ return log_oom();
+
+ r = tempfn_random(i->final_path, NULL, &i->temp_path);
+ if (r < 0)
+ return log_oom();
+
+ (void) mkdir_parents_label(i->temp_path, 0700);
+
+ i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+ if (i->output_fd < 0)
+ return log_error_errno(errno, "Failed to open destination '%s': %m", i->temp_path);
+
+ (void) import_set_nocow_and_log(i->output_fd, i->temp_path);
+ }
+
+ if (fstat(i->output_fd, &i->output_stat) < 0)
+ return log_error_errno(errno, "Failed to stat() output file: %m");
+
+ if (!S_ISREG(i->output_stat.st_mode) && !S_ISBLK(i->output_stat.st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EBADFD),
+ "Target file is not a regular file or block device");
+
+ if (i->offset != UINT64_MAX) {
+ if (lseek(i->output_fd, i->offset, SEEK_SET) < 0)
+ return log_error_errno(errno, "Failed to seek to offset: %m");
+ }
+
+ return 0;
+}
+
+static int raw_import_try_reflink(RawImport *i) {
+ off_t p;
+ int r;
+
+ assert(i);
+ assert(i->input_fd >= 0);
+ assert(i->output_fd >= 0);
+
+ if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED)
+ return 0;
+
+ if (i->offset != UINT64_MAX || i->size_max != UINT64_MAX)
+ return 0;
+
+ if (!S_ISREG(i->input_stat.st_mode) || !S_ISREG(i->output_stat.st_mode))
+ return 0;
+
+ p = lseek(i->input_fd, 0, SEEK_CUR);
+ if (p < 0)
+ return log_error_errno(errno, "Failed to read file offset of input file: %m");
+
+ /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */
+ if ((uint64_t) p != (uint64_t) i->buffer_size)
+ return 0;
+
+ r = reflink(i->input_fd, i->output_fd);
+ if (r >= 0)
+ return 1;
+
+ log_debug_errno(r, "Couldn't establish reflink, using copy: %m");
+ return 0;
+}
+
+static int raw_import_write(const void *p, size_t sz, void *userdata) {
+ RawImport *i = ASSERT_PTR(userdata);
+ bool too_much = false;
+ int r;
+
+ assert(p);
+ assert(sz > 0);
+
+ if (i->written_uncompressed >= UINT64_MAX - sz)
+ return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "File too large, overflow");
+
+ if (i->size_max != UINT64_MAX) {
+ if (i->written_uncompressed >= i->size_max) {
+ too_much = true;
+ goto finish;
+ }
+
+ if (i->written_uncompressed + sz > i->size_max) {
+ too_much = true;
+ sz = i->size_max - i->written_uncompressed; /* since we have the data in memory
+ * already, we might as well write it to
+ * disk to the max */
+ }
+ }
+
+ /* Generate sparse file if we created/truncated the file */
+ if (S_ISREG(i->output_stat.st_mode) && i->offset == UINT64_MAX) {
+ ssize_t n;
+
+ n = sparse_write(i->output_fd, p, sz, 64);
+ if (n < 0)
+ return log_error_errno((int) n, "Failed to write file: %m");
+ if ((size_t) n < sz)
+ return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write");
+ } else {
+ r = loop_write(i->output_fd, p, sz);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write file: %m");
+ }
+
+ i->written_uncompressed += sz;
+
+finish:
+ if (too_much)
+ return log_error_errno(SYNTHETIC_ERRNO(E2BIG), "File too large");
+
+ return 0;
+}
+
+static int raw_import_process(RawImport *i) {
+ ssize_t l;
+ int r;
+
+ assert(i);
+ assert(i->buffer_size < sizeof(i->buffer));
+
+ l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
+ if (l < 0) {
+ if (errno == EAGAIN)
+ return 0;
+
+ r = log_error_errno(errno, "Failed to read input file: %m");
+ goto finish;
+ }
+
+ i->buffer_size += l;
+
+ if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
+
+ if (l == 0) { /* EOF */
+ log_debug("File too short to be compressed, as no compression signature fits in, thus assuming uncompressed.");
+ import_uncompress_force_off(&i->compress);
+ } else {
+ r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
+ if (r < 0) {
+ log_error_errno(r, "Failed to detect file compression: %m");
+ goto finish;
+ }
+ if (r == 0) /* Need more data */
+ return 0;
+ }
+
+ r = raw_import_open_disk(i);
+ if (r < 0)
+ goto finish;
+
+ r = raw_import_try_reflink(i);
+ if (r < 0)
+ goto finish;
+ if (r > 0)
+ goto complete;
+ }
+
+ r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i);
+ if (r < 0) {
+ log_error_errno(r, "Failed to decode and write: %m");
+ goto finish;
+ }
+
+ i->written_compressed += i->buffer_size;
+ i->buffer_size = 0;
+
+ if (l == 0) /* EOF */
+ goto complete;
+
+ raw_import_report_progress(i);
+
+ return 0;
+
+complete:
+ r = raw_import_finish(i);
+
+finish:
+ if (i->on_finished)
+ i->on_finished(i, r, i->userdata);
+ else
+ sd_event_exit(i->event, r);
+
+ return 0;
+}
+
+static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ RawImport *i = userdata;
+
+ return raw_import_process(i);
+}
+
+static int raw_import_on_defer(sd_event_source *s, void *userdata) {
+ RawImport *i = userdata;
+
+ return raw_import_process(i);
+}
+
+int raw_import_start(
+ RawImport *i,
+ int fd,
+ const char *local,
+ uint64_t offset,
+ uint64_t size_max,
+ ImportFlags flags) {
+ int r;
+
+ assert(i);
+ assert(fd >= 0);
+ assert(local);
+ assert(!(flags & ~IMPORT_FLAGS_MASK_RAW));
+ assert(offset == UINT64_MAX || FLAGS_SET(flags, IMPORT_DIRECT));
+
+ if (!import_validate_local(local, flags))
+ return -EINVAL;
+
+ if (i->input_fd >= 0)
+ return -EBUSY;
+
+ r = fd_nonblock(fd, true);
+ if (r < 0)
+ return r;
+
+ r = free_and_strdup(&i->local, local);
+ if (r < 0)
+ return r;
+
+ i->flags = flags;
+ i->offset = offset;
+ i->size_max = size_max;
+
+ if (fstat(fd, &i->input_stat) < 0)
+ return -errno;
+
+ r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i);
+ if (r == -EPERM) {
+ /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
+ r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i);
+ if (r < 0)
+ return r;
+
+ r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);
+ }
+ if (r < 0)
+ return r;
+
+ i->input_fd = fd;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 02:11:01 +0000