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import-tar.c
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381 lines (287 loc) · 10.2 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 "fileio.h"
#include "fs-util.h"
#include "hostname-util.h"
#include "import-common.h"
#include "import-compress.h"
#include "import-tar.h"
#include "install-file.h"
#include "io-util.h"
#include "machine-pool.h"
#include "mkdir-label.h"
#include "path-util.h"
#include "process-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 TarImport {
sd_event *event;
char *image_root;
TarImportFinished on_finished;
void *userdata;
char *local;
ImportFlags flags;
char *temp_path;
char *final_path;
int input_fd;
int tar_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;
pid_t tar_pid;
unsigned last_percent;
RateLimit progress_ratelimit;
};
TarImport* tar_import_unref(TarImport *i) {
if (!i)
return NULL;
sd_event_source_unref(i->input_event_source);
if (i->tar_pid > 1)
sigkill_wait(i->tar_pid);
rm_rf_subvolume_and_free(i->temp_path);
import_compress_free(&i->compress);
sd_event_unref(i->event);
safe_close(i->tar_fd);
free(i->final_path);
free(i->image_root);
free(i->local);
return mfree(i);
}
int tar_import_new(
TarImport **ret,
sd_event *event,
const char *image_root,
TarImportFinished on_finished,
void *userdata) {
_cleanup_(tar_import_unrefp) TarImport *i = NULL;
_cleanup_free_ char *root = NULL;
int r;
assert(ret);
root = strdup(image_root ?: "/var/lib/machines");
if (!root)
return -ENOMEM;
i = new(TarImport, 1);
if (!i)
return -ENOMEM;
*i = (TarImport) {
.input_fd = -1,
.tar_fd = -1,
.on_finished = on_finished,
.userdata = userdata,
.last_percent = UINT_MAX,
.image_root = TAKE_PTR(root),
.progress_ratelimit = { 100 * USEC_PER_MSEC, 1 },
};
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 tar_import_report_progress(TarImport *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 tar_import_finish(TarImport *i) {
const char *d;
int r;
assert(i);
assert(i->tar_fd >= 0);
i->tar_fd = safe_close(i->tar_fd);
if (i->tar_pid > 0) {
r = wait_for_terminate_and_check("tar", TAKE_PID(i->tar_pid), WAIT_LOG);
if (r < 0)
return r;
if (r != EXIT_SUCCESS)
return -EPROTO;
}
assert_se(d = i->temp_path ?: i->local);
r = import_mangle_os_tree(d);
if (r < 0)
return r;
r = install_file(
AT_FDCWD, d,
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_SYNCFS : 0));
if (r < 0)
return log_error_errno(r, "Failed to move '%s' into place: %m", i->final_path ?: i->local);
i->temp_path = mfree(i->temp_path);
return 0;
}
static int tar_import_fork_tar(TarImport *i) {
const char *d, *root;
int r;
assert(i);
assert(i->local);
assert(!i->final_path);
assert(!i->temp_path);
assert(i->tar_fd < 0);
if (i->flags & IMPORT_DIRECT) {
d = i->local;
root = NULL;
} else {
i->final_path = path_join(i->image_root, i->local);
if (!i->final_path)
return log_oom();
r = tempfn_random(i->final_path, NULL, &i->temp_path);
if (r < 0)
return log_oom();
d = i->temp_path;
root = i->image_root;
}
assert(d);
(void) mkdir_parents_label(d, 0700);
if (FLAGS_SET(i->flags, IMPORT_DIRECT|IMPORT_FORCE))
(void) rm_rf(d, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
if (i->flags & IMPORT_BTRFS_SUBVOL)
r = btrfs_subvol_make_fallback(d, 0755);
else
r = RET_NERRNO(mkdir(d, 0755));
if (r == -EEXIST && (i->flags & IMPORT_DIRECT)) /* EEXIST is OK if in direct mode, but not otherwise,
* because in that case our temporary path collided */
r = 0;
if (r < 0)
return log_error_errno(r, "Failed to create directory/subvolume %s: %m", d);
if (r > 0 && (i->flags & IMPORT_BTRFS_QUOTA)) { /* actually btrfs subvol */
if (!(i->flags & IMPORT_DIRECT))
(void) import_assign_pool_quota_and_warn(root);
(void) import_assign_pool_quota_and_warn(d);
}
i->tar_fd = import_fork_tar_x(d, &i->tar_pid);
if (i->tar_fd < 0)
return i->tar_fd;
return 0;
}
static int tar_import_write(const void *p, size_t sz, void *userdata) {
TarImport *i = userdata;
int r;
r = loop_write(i->tar_fd, p, sz, false);
if (r < 0)
return r;
i->written_uncompressed += sz;
return 0;
}
static int tar_import_process(TarImport *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 = tar_import_fork_tar(i);
if (r < 0)
goto finish;
}
r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_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 */
r = tar_import_finish(i);
goto finish;
}
tar_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 tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
TarImport *i = userdata;
return tar_import_process(i);
}
static int tar_import_on_defer(sd_event_source *s, void *userdata) {
TarImport *i = userdata;
return tar_import_process(i);
}
int tar_import_start(TarImport *i, int fd, const char *local, ImportFlags flags) {
int r;
assert(i);
assert(fd >= 0);
assert(local);
assert(!(flags & ~IMPORT_FLAGS_MASK_TAR));
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;
if (fstat(fd, &i->input_stat) < 0)
return -errno;
r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_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, tar_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;
}