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-rw-r--r--src/import/pull-tar.c417
1 files changed, 417 insertions, 0 deletions
diff --git a/src/import/pull-tar.c b/src/import/pull-tar.c
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+++ b/src/import/pull-tar.c
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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 <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;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-10-31 13:47:52 +0000