1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2015 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/prctl.h>
23 #include <curl/curl.h>
29 #include "btrfs-util.h"
33 #include "curl-util.h"
34 #include "import-job.h"
35 #include "import-util.h"
36 #include "import-tar.h"
46 TarImportFinished on_finished;
60 TarImport* tar_import_unref(TarImport *i) {
65 kill(i->tar_pid, SIGKILL);
66 wait_for_terminate(i->tar_pid, NULL);
69 import_job_unref(i->tar_job);
71 curl_glue_unref(i->glue);
72 sd_event_unref(i->event);
75 (void) btrfs_subvol_remove(i->temp_path);
76 (void) rm_rf_dangerous(i->temp_path, false, true, false);
88 int tar_import_new(TarImport **ret, sd_event *event, const char *image_root, TarImportFinished on_finished, void *userdata) {
89 _cleanup_(tar_import_unrefp) TarImport *i = NULL;
95 i = new0(TarImport, 1);
99 i->on_finished = on_finished;
100 i->userdata = userdata;
102 i->image_root = strdup(image_root ?: "/var/lib/machines");
107 i->event = sd_event_ref(event);
109 r = sd_event_default(&i->event);
114 r = curl_glue_new(&i->glue, i->event);
118 i->glue->on_finished = import_job_curl_on_finished;
119 i->glue->userdata = i;
127 static void tar_import_job_on_finished(ImportJob *j) {
141 /* This is invoked if either the download completed
142 * successfully, or the download was skipped because we
143 * already have the etag. */
145 j->disk_fd = safe_close(j->disk_fd);
147 if (i->tar_pid > 0) {
148 r = wait_for_terminate_and_warn("tar", i->tar_pid, true);
155 r = import_make_read_only(i->temp_path);
159 if (rename(i->temp_path, i->final_path) < 0) {
160 r = log_error_errno(errno, "Failed to rename to final image name: %m");
166 if (!i->final_path) {
167 r = import_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path);
172 r = import_make_local_copy(i->final_path, i->image_root, i->local, i->force_local);
183 i->on_finished(i, r, i->userdata);
185 sd_event_exit(i->event, r);
188 static int tar_import_job_on_open_disk(ImportJob *j) {
189 _cleanup_close_pair_ int pipefd[2] = { -1 , -1 };
198 r = import_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path);
202 r = tempfn_random(i->final_path, &i->temp_path);
206 mkdir_parents_label(i->temp_path, 0700);
208 r = btrfs_subvol_make(i->temp_path);
210 if (mkdir(i->temp_path, 0755) < 0)
211 return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
213 return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path);
215 if (pipe2(pipefd, O_CLOEXEC) < 0)
216 return log_error_errno(errno, "Failed to create pipe for tar: %m");
220 return log_error_errno(errno, "Failed to fork off tar: %m");
221 if (i->tar_pid == 0) {
224 reset_all_signal_handlers();
226 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
228 pipefd[1] = safe_close(pipefd[1]);
230 if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
231 log_error_errno(errno, "Failed to dup2() fd: %m");
235 if (pipefd[0] != STDIN_FILENO)
236 safe_close(pipefd[0]);
238 null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
240 log_error_errno(errno, "Failed to open /dev/null: %m");
244 if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
245 log_error_errno(errno, "Failed to dup2() fd: %m");
249 if (null_fd != STDOUT_FILENO)
252 execlp("tar", "tar", "--numeric-owner", "-C", i->temp_path, "-px", NULL);
256 pipefd[0] = safe_close(pipefd[0]);
258 j->disk_fd = pipefd[1];
264 int tar_import_pull(TarImport *i, const char *url, const char *local, bool force_local) {
272 if (!http_url_is_valid(url))
275 if (local && !machine_name_is_valid(local))
278 r = free_and_strdup(&i->local, local);
282 i->force_local = force_local;
284 r = import_job_new(&i->tar_job, url, i->glue, i);
288 i->tar_job->on_finished = tar_import_job_on_finished;
289 i->tar_job->on_open_disk = tar_import_job_on_open_disk;
291 r = import_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags);
295 return import_job_begin(i->tar_job);