/*-*- 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 "rm-rf.h" #include "ratelimit.h" #include "machine-pool.h" #include "qcow2-util.h" #include "import-compress.h" #include "import-common.h" #include "import-tar.h" #include "process-util.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_source_unref(i->input_event_source); 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) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); 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); 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, 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 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) 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 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_x(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) { 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 = 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 = 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, 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; }