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systemd/src/import/import-raw.c
Lennart Poettering 25300b5a1f util: make machine_name_is_valid() a macro and move it to hostname-util.h 
As it turns out machine_name_is_valid() does the exact same thing as
hostname_is_valid() these days, as it just invoked that and checked the
name length was < 64. However, hostname_is_valid() checks the length
against HOST_NAME_MAX anyway (which is 64 on Linux), hence any
additional check is redundant.

We hence replace machine_name_is_valid() by a macro that simply maps it
to hostname_is_valid() but sets the allow_trailing_dot parameter to
false. We also move this this call to hostname-util.h, to the same place
as the hostname_is_valid() declaration.
2015-08-24 22:46:45 +02:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2015 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <linux/fs.h>
#include "sd-daemon.h"
#include "sd-event.h"
#include "util.h"
#include "path-util.h"
#include "btrfs-util.h"
#include "hostname-util.h"
#include "copy.h"
#include "mkdir.h"
#include "rm-rf.h"
#include "ratelimit.h"
#include "machine-pool.h"
#include "qcow2-util.h"
#include "import-compress.h"
#include "import-common.h"
#include "import-raw.h"
struct RawImport {
sd_event *event;
char *image_root;
RawImportFinished on_finished;
void *userdata;
char *local;
bool force_local;
bool read_only;
bool grow_machine_directory;
char *temp_path;
char *final_path;
int input_fd;
int output_fd;
ImportCompress compress;
uint64_t written_since_last_grow;
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 st;
unsigned last_percent;
RateLimit progress_rate_limit;
};
RawImport* raw_import_unref(RawImport *i) {
if (!i)
return NULL;
sd_event_unref(i->event);
if (i->temp_path) {
(void) unlink(i->temp_path);
free(i->temp_path);
}
import_compress_free(&i->compress);
sd_event_source_unref(i->input_event_source);
safe_close(i->output_fd);
free(i->final_path);
free(i->image_root);
free(i->local);
free(i);
return NULL;
}
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;
int r;
assert(ret);
i = new0(RawImport, 1);
if (!i)
return -ENOMEM;
i->input_fd = i->output_fd = -1;
i->on_finished = on_finished;
i->userdata = userdata;
RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
i->last_percent = (unsigned) -1;
i->image_root = strdup(image_root ?: "/var/lib/machines");
if (!i->image_root)
return -ENOMEM;
i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");
if (event)
i->event = sd_event_ref(event);
else {
r = sd_event_default(&i->event);
if (r < 0)
return r;
}
*ret = i;
i = NULL;
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->st.st_mode))
return;
if (i->written_compressed >= (uint64_t) i->st.st_size)
percent = 100;
else
percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size);
if (percent == i->last_percent)
return;
if (!ratelimit_test(&i->progress_rate_limit))
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_free_ char *t = NULL;
int r;
assert(i);
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, &t);
if (r < 0)
return log_oom();
converted_fd = open(t, 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", t);
r = chattr_fd(converted_fd, FS_NOCOW_FL, FS_NOCOW_FL);
if (r < 0)
log_warning_errno(errno, "Failed to set file attributes on %s: %m", t);
log_info("Unpacking QCOW2 file.");
r = qcow2_convert(i->output_fd, converted_fd);
if (r < 0) {
unlink(t);
return log_error_errno(r, "Failed to convert qcow2 image: %m");
}
(void) unlink(i->temp_path);
free(i->temp_path);
i->temp_path = t;
t = NULL;
safe_close(i->output_fd);
i->output_fd = converted_fd;
converted_fd = -1;
return 1;
}
static int raw_import_finish(RawImport *i) {
int r;
assert(i);
assert(i->output_fd >= 0);
assert(i->temp_path);
assert(i->final_path);
/* In case this was a sparse file, make sure the file system 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->st.st_mode)) {
(void) copy_times(i->input_fd, i->output_fd);
(void) copy_xattr(i->input_fd, i->output_fd);
}
if (i->read_only) {
r = import_make_read_only_fd(i->output_fd);
if (r < 0)
return r;
}
if (i->force_local)
(void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);
if (r < 0)
return log_error_errno(r, "Failed to move image into place: %m");
free(i->temp_path);
i->temp_path = NULL;
return 0;
}
static int raw_import_open_disk(RawImport *i) {
int r;
assert(i);
assert(!i->final_path);
assert(!i->temp_path);
assert(i->output_fd < 0);
i->final_path = strjoin(i->image_root, "/", i->local, ".raw", NULL);
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);
r = chattr_fd(i->output_fd, FS_NOCOW_FL, FS_NOCOW_FL);
if (r < 0)
log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path);
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 (!S_ISREG(i->st.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;
return 0;
}
static int raw_import_write(const void *p, size_t sz, void *userdata) {
RawImport *i = userdata;
ssize_t n;
if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) {
i->written_since_last_grow = 0;
grow_machine_directory();
}
n = sparse_write(i->output_fd, p, sz, 64);
if (n < 0)
return -errno;
if ((size_t) n < sz)
return -EIO;
i->written_uncompressed += sz;
i->written_since_last_grow += sz;
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;
}
if (l == 0) {
if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
log_error("Premature end of file: %m");
r = -EIO;
goto finish;
}
r = raw_import_finish(i);
goto finish;
}
i->buffer_size += l;
if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
if (r < 0) {
log_error("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) {
r = raw_import_finish(i);
goto finish;
}
}
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;
raw_import_report_progress(i);
return 0;
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, bool force_local, bool read_only) {
int r;
assert(i);
assert(fd >= 0);
assert(local);
if (!machine_name_is_valid(local))
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->force_local = force_local;
i->read_only = read_only;
if (fstat(fd, &i->st) < 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 r;
}
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