/*-*- 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 <sys/prctl.h> #include <curl/curl.h> #include "sd-daemon.h" #include "utf8.h" #include "strv.h" #include "copy.h" #include "btrfs-util.h" #include "util.h" #include "macro.h" #include "mkdir.h" #include "rm-rf.h" #include "path-util.h" #include "import-util.h" #include "import-common.h" #include "curl-util.h" #include "pull-job.h" #include "pull-common.h" #include "pull-tar.h" #include "process-util.h" typedef enum TarProgress { TAR_DOWNLOADING, TAR_VERIFYING, TAR_FINALIZING, TAR_COPYING, } TarProgress; struct TarPull { sd_event *event; CurlGlue *glue; char *image_root; PullJob *tar_job; PullJob *checksum_job; PullJob *signature_job; TarPullFinished on_finished; void *userdata; char *local; bool force_local; bool grow_machine_directory; pid_t tar_pid; char *temp_path; char *final_path; ImportVerify verify; }; TarPull* tar_pull_unref(TarPull *i) { if (!i) return NULL; if (i->tar_pid > 1) { (void) kill_and_sigcont(i->tar_pid, SIGKILL); (void) wait_for_terminate(i->tar_pid, NULL); } pull_job_unref(i->tar_job); pull_job_unref(i->checksum_job); pull_job_unref(i->signature_job); curl_glue_unref(i->glue); sd_event_unref(i->event); if (i->temp_path) { (void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); free(i->temp_path); } free(i->final_path); free(i->image_root); free(i->local); free(i); return NULL; } int tar_pull_new( TarPull **ret, sd_event *event, const char *image_root, TarPullFinished on_finished, void *userdata) { _cleanup_(tar_pull_unrefp) TarPull *i = NULL; int r; assert(ret); assert(event); i = new0(TarPull, 1); if (!i) return -ENOMEM; i->on_finished = on_finished; i->userdata = userdata; 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; } r = curl_glue_new(&i->glue, i->event); if (r < 0) return r; i->glue->on_finished = pull_job_curl_on_finished; i->glue->userdata = i; *ret = i; i = NULL; return 0; } static void tar_pull_report_progress(TarPull *i, TarProgress p) { unsigned percent; assert(i); switch (p) { case TAR_DOWNLOADING: { unsigned remain = 85; percent = 0; if (i->checksum_job) { percent += i->checksum_job->progress_percent * 5 / 100; remain -= 5; } if (i->signature_job) { percent += i->signature_job->progress_percent * 5 / 100; remain -= 5; } if (i->tar_job) percent += i->tar_job->progress_percent * remain / 100; break; } case TAR_VERIFYING: percent = 85; break; case TAR_FINALIZING: percent = 90; break; case TAR_COPYING: percent = 95; break; default: assert_not_reached("Unknown progress state"); } sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); log_debug("Combined progress %u%%", percent); } static int tar_pull_make_local_copy(TarPull *i) { int r; assert(i); assert(i->tar_job); if (!i->local) return 0; if (!i->final_path) { r = pull_make_path(i->tar_job->url, i->tar_job->etag, i->image_root, ".tar-", NULL, &i->final_path); if (r < 0) return log_oom(); } r = pull_make_local_copy(i->final_path, i->image_root, i->local, i->force_local); if (r < 0) return r; return 0; } static bool tar_pull_is_done(TarPull *i) { assert(i); assert(i->tar_job); if (i->tar_job->state != PULL_JOB_DONE) return false; if (i->checksum_job && i->checksum_job->state != PULL_JOB_DONE) return false; if (i->signature_job && i->signature_job->state != PULL_JOB_DONE) return false; return true; } static void tar_pull_job_on_finished(PullJob *j) { TarPull *i; int r; assert(j); assert(j->userdata); i = j->userdata; if (j->error != 0) { if (j == i->checksum_job) log_error_errno(j->error, "Failed to retrieve SHA256 checksum, cannot verify. (Try --verify=no?)"); else if (j == i->signature_job) log_error_errno(j->error, "Failed to retrieve signature file, cannot verify. (Try --verify=no?)"); else log_error_errno(j->error, "Failed to retrieve image file. (Wrong URL?)"); r = j->error; goto finish; } /* This is invoked if either the download completed * successfully, or the download was skipped because we * already have the etag. */ if (!tar_pull_is_done(i)) return; j->disk_fd = safe_close(i->tar_job->disk_fd); if (i->tar_pid > 0) { r = wait_for_terminate_and_warn("tar", i->tar_pid, true); i->tar_pid = 0; if (r < 0) goto finish; } if (!i->tar_job->etag_exists) { /* This is a new download, verify it, and move it into place */ tar_pull_report_progress(i, TAR_VERIFYING); r = pull_verify(i->tar_job, i->checksum_job, i->signature_job); if (r < 0) goto finish; tar_pull_report_progress(i, TAR_FINALIZING); r = import_make_read_only(i->temp_path); if (r < 0) goto finish; r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); if (r < 0) { log_error_errno(r, "Failed to rename to final image name: %m"); goto finish; } free(i->temp_path); i->temp_path = NULL; } tar_pull_report_progress(i, TAR_COPYING); r = tar_pull_make_local_copy(i); if (r < 0) goto finish; r = 0; finish: if (i->on_finished) i->on_finished(i, r, i->userdata); else sd_event_exit(i->event, r); } static int tar_pull_job_on_open_disk(PullJob *j) { TarPull *i; int r; assert(j); assert(j->userdata); i = j->userdata; assert(i->tar_job == j); assert(!i->final_path); assert(!i->temp_path); assert(i->tar_pid <= 0); r = pull_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path); if (r < 0) return log_oom(); r = tempfn_random(i->final_path, &i->temp_path); if (r < 0) return log_oom(); 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); j->disk_fd = import_fork_tar_x(i->temp_path, &i->tar_pid); if (j->disk_fd < 0) return j->disk_fd; return 0; } static void tar_pull_job_on_progress(PullJob *j) { TarPull *i; assert(j); assert(j->userdata); i = j->userdata; tar_pull_report_progress(i, TAR_DOWNLOADING); } int tar_pull_start(TarPull *i, const char *url, const char *local, bool force_local, ImportVerify verify) { int r; assert(i); if (!http_url_is_valid(url)) return -EINVAL; if (local && !machine_name_is_valid(local)) return -EINVAL; if (i->tar_job) return -EBUSY; r = free_and_strdup(&i->local, local); if (r < 0) return r; i->force_local = force_local; i->verify = verify; r = pull_job_new(&i->tar_job, url, i->glue, i); if (r < 0) return r; i->tar_job->on_finished = tar_pull_job_on_finished; i->tar_job->on_open_disk = tar_pull_job_on_open_disk; i->tar_job->on_progress = tar_pull_job_on_progress; i->tar_job->calc_checksum = verify != IMPORT_VERIFY_NO; i->tar_job->grow_machine_directory = i->grow_machine_directory; r = pull_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags); if (r < 0) return r; r = pull_make_verification_jobs(&i->checksum_job, &i->signature_job, verify, url, i->glue, tar_pull_job_on_finished, i); if (r < 0) return r; r = pull_job_begin(i->tar_job); if (r < 0) return r; if (i->checksum_job) { i->checksum_job->on_progress = tar_pull_job_on_progress; r = pull_job_begin(i->checksum_job); if (r < 0) return r; } if (i->signature_job) { i->signature_job->on_progress = tar_pull_job_on_progress; r = pull_job_begin(i->signature_job); if (r < 0) return r; } return 0; }