--- /dev/null
+/*-*- 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 "copy.h"
+#include "mkdir.h"
+#include "ratelimit.h"
+#include "machine-pool.h"
+#include "qcow2-util.h"
+#include "import-compress.h"
+#include "import-common.h"
+#include "import-tar.h"
+
+struct TarImport {
+ sd_event *event;
+
+ char *image_root;
+
+ TarImportFinished 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 tar_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;
+
+ pid_t tar_pid;
+
+ unsigned last_percent;
+ RateLimit progress_rate_limit;
+};
+
+TarImport* tar_import_unref(TarImport *i) {
+ if (!i)
+ return NULL;
+
+ sd_event_unref(i->event);
+
+ if (i->tar_pid > 1) {
+ (void) kill_and_sigcont(i->tar_pid, SIGKILL);
+ (void) wait_for_terminate(i->tar_pid, NULL);
+ }
+
+ if (i->temp_path) {
+ (void) btrfs_subvol_remove(i->temp_path);
+ (void) rm_rf_dangerous(i->temp_path, false, true, false);
+ free(i->temp_path);
+ }
+
+ import_compress_free(&i->compress);
+
+ sd_event_source_unref(i->input_event_source);
+
+ safe_close(i->tar_fd);
+
+ free(i->final_path);
+ free(i->image_root);
+ free(i->local);
+ free(i);
+
+ return NULL;
+}
+
+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;
+ int r;
+
+ assert(ret);
+
+ i = new0(TarImport, 1);
+ if (!i)
+ return -ENOMEM;
+
+ i->input_fd = i->tar_fd = -1;
+ i->on_finished = on_finished;
+ i->userdata = userdata;
+
+ RATELIMIT_INIT(i->progress_rate_limit, 500 * 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 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->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 tar_import_finish(TarImport *i) {
+ int r;
+
+ assert(i);
+ assert(i->tar_fd >= 0);
+ assert(i->temp_path);
+ assert(i->final_path);
+
+ i->tar_fd = safe_close(i->tar_fd);
+
+ if (i->tar_pid > 0) {
+ r = wait_for_terminate_and_warn("tar", i->tar_pid, true);
+ i->tar_pid = 0;
+ if (r < 0)
+ return r;
+ }
+
+ if (i->read_only) {
+ r = import_make_read_only(i->temp_path);
+ if (r < 0)
+ return r;
+ }
+
+ if (i->force_local) {
+ (void) btrfs_subvol_remove(i->final_path);
+ (void) rm_rf_dangerous(i->final_path, false, true, false);
+ }
+
+ if (renameat2(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path, RENAME_NOREPLACE) < 0)
+ return log_error_errno(errno, "Failed to move image into place: %m");
+
+ free(i->temp_path);
+ i->temp_path = NULL;
+
+ return 0;
+}
+
+static int tar_import_fork_tar(TarImport *i) {
+ int r;
+
+ assert(i);
+
+ assert(!i->final_path);
+ assert(!i->temp_path);
+ assert(i->tar_fd < 0);
+
+ i->final_path = strjoin(i->image_root, "/", i->local, NULL);
+ if (!i->final_path)
+ return log_oom();
+
+ r = tempfn_random(i->final_path, &i->temp_path);
+ if (r < 0)
+ return log_oom();
+
+ (void) mkdir_parents_label(i->temp_path, 0700);
+
+ r = btrfs_subvol_make(i->temp_path);
+ if (r == -ENOTTY) {
+ if (mkdir(i->temp_path, 0755) < 0)
+ return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
+ } else if (r < 0)
+ return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path);
+
+ i->tar_fd = import_fork_tar(i->temp_path, &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;
+
+ if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) {
+ i->written_since_last_grow = 0;
+ grow_machine_directory();
+ }
+
+ r = loop_write(i->tar_fd, p, sz, false);
+ if (r < 0)
+ return r;
+
+ i->written_uncompressed += sz;
+ i->written_since_last_grow += 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) {
+ 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 = tar_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 = 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;
+
+ 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, 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 = 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, 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 r;
+}
~ianmdlvl / elogind.git / blobdiff