--- /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 <sys/prctl.h>
+#include <curl/curl.h>
+
+#include "hashmap.h"
+#include "utf8.h"
+#include "strv.h"
+#include "copy.h"
+#include "btrfs-util.h"
+#include "util.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "curl-util.h"
+#include "import-job.h"
+#include "import-util.h"
+#include "import-tar.h"
+
+struct TarImport {
+ sd_event *event;
+ CurlGlue *glue;
+
+ char *image_root;
+
+ ImportJob *tar_job;
+
+ TarImportFinished on_finished;
+ void *userdata;
+
+ bool finished;
+
+ char *local;
+ bool force_local;
+
+ pid_t tar_pid;
+
+ char *temp_path;
+ char *final_path;
+};
+
+TarImport* tar_import_unref(TarImport *i) {
+ if (!i)
+ return NULL;
+
+ if (i->tar_pid > 0) {
+ kill(i->tar_pid, SIGKILL);
+ wait_for_terminate(i->tar_pid, NULL);
+ }
+
+ import_job_unref(i->tar_job);
+
+ curl_glue_unref(i->glue);
+ sd_event_unref(i->event);
+
+ if (i->temp_path) {
+ (void) btrfs_subvol_remove(i->temp_path);
+ (void) rm_rf_dangerous(i->temp_path, false, true, false);
+ }
+
+ 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);
+ assert(event);
+
+ i = new0(TarImport, 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;
+
+ 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 = import_job_curl_on_finished;
+ i->glue->userdata = i;
+
+ *ret = i;
+ i = NULL;
+
+ return 0;
+}
+
+static void tar_import_job_on_finished(ImportJob *j) {
+ TarImport *i;
+ int r;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+
+ if (j->error != 0) {
+ 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. */
+
+ j->disk_fd = safe_close(j->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->temp_path) {
+ r = import_make_read_only(i->temp_path);
+ if (r < 0)
+ goto finish;
+
+ if (rename(i->temp_path, i->final_path) < 0) {
+ r = log_error_errno(errno, "Failed to rename to final image name: %m");
+ goto finish;
+ }
+ }
+
+ if (i->local) {
+ if (!i->final_path) {
+ r = import_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path);
+ if (r < 0)
+ goto finish;
+ }
+
+ r = import_make_local_copy(i->final_path, i->image_root, i->local, i->force_local);
+ if (r < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ i->finished = true;
+
+ if (i->on_finished)
+ i->on_finished(i, r, i->userdata);
+ else
+ sd_event_exit(i->event, r);
+}
+
+static int tar_import_job_on_open_disk(ImportJob *j) {
+ _cleanup_close_pair_ int pipefd[2] = { -1 , -1 };
+ TarImport *i;
+ int r;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+
+ r = import_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);
+
+ if (pipe2(pipefd, O_CLOEXEC) < 0)
+ return log_error_errno(errno, "Failed to create pipe for tar: %m");
+
+ i->tar_pid = fork();
+ if (i->tar_pid < 0)
+ return log_error_errno(errno, "Failed to fork off tar: %m");
+ if (i->tar_pid == 0) {
+ int null_fd;
+
+ reset_all_signal_handlers();
+ reset_signal_mask();
+ assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
+
+ pipefd[1] = safe_close(pipefd[1]);
+
+ if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (pipefd[0] != STDIN_FILENO)
+ safe_close(pipefd[0]);
+
+ null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
+ if (null_fd < 0) {
+ log_error_errno(errno, "Failed to open /dev/null: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (null_fd != STDOUT_FILENO)
+ safe_close(null_fd);
+
+ execlp("tar", "tar", "--numeric-owner", "-C", i->temp_path, "-px", NULL);
+ _exit(EXIT_FAILURE);
+ }
+
+ pipefd[0] = safe_close(pipefd[0]);
+
+ j->disk_fd = pipefd[1];
+ pipefd[1] = -1;
+
+ return 0;
+}
+
+int tar_import_pull(TarImport *i, const char *url, const char *local, bool force_local) {
+ int r;
+
+ assert(i);
+
+ if (i->tar_job)
+ return -EBUSY;
+
+ if (!http_url_is_valid(url))
+ return -EINVAL;
+
+ if (local && !machine_name_is_valid(local))
+ return -EINVAL;
+
+ r = free_and_strdup(&i->local, local);
+ if (r < 0)
+ return r;
+
+ i->force_local = force_local;
+
+ r = import_job_new(&i->tar_job, url, i->glue, i);
+ if (r < 0)
+ return r;
+
+ i->tar_job->on_finished = tar_import_job_on_finished;
+ i->tar_job->on_open_disk = tar_import_job_on_open_disk;
+
+ r = import_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags);
+ if (r < 0)
+ return r;
+
+ return import_job_begin(i->tar_job);
+}
~ianmdlvl / elogind.git / blobdiff