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import-raw.c
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531 lines (401 loc) · 16.1 KB
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/* 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"
#include "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 = -1,
.output_fd = -1,
.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 = -1;
_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, i->output_fd, 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) == (off_t) -1)
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 == (off_t) -1)
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 = btrfs_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 = userdata;
bool too_much = false;
int r;
assert(i);
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, false);
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;
}