mirror of
https://github.com/morgan9e/systemd
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c2756a6840
Transient units can be created via the bus API. They are configured via the method call parameters rather than on-disk files. They are subject to normal GC. Transient units currently may only be created for services (however, we will extend this), and currently only ExecStart= and the cgroup parameters can be configured (also to be extended). Transient units require a unique name, that previously had no configuration file on disk. A tool systemd-run is added that makes use of this functionality to run arbitrary command lines as transient services: $ systemd-run /bin/ping www.heise.de Will cause systemd to create a new transient service and run ping in it.
157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdio.h>
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#include "sd-bus.h"
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#include "bus-internal.h"
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#include "bus-message.h"
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#include "strv.h"
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static int start_transient_service(
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sd_bus *bus,
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const char *name,
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char **argv,
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sd_bus_error *error) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
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char **i;
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int r;
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r = sd_bus_message_new_method_call(
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bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"StartTransientUnit", &m);
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "ss", name, "fail");
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'a', "(sv)");
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'r', "sv");
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "s", "ExecStart");
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'v', "a(sasb)");
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'a', "(sasb)");
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'r', "sasb");
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "s", argv[0]);
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'a', "s");
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if (r < 0)
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return r;
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STRV_FOREACH(i, argv) {
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r = sd_bus_message_append(m, "s", *i);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "b", false);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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return sd_bus_send_with_reply_and_block(bus, m, 0, error, &reply);
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}
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int main(int argc, char* argv[]) {
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sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_bus_unref_ sd_bus *bus = NULL;
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_cleanup_free_ char *name = NULL;
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int r;
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log_parse_environment();
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log_open();
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if (argc < 2) {
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log_error("Missing command line.");
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r = -EINVAL;
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goto fail;
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}
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r = sd_bus_open_user(&bus);
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if (r < 0) {
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log_error("Failed to create new bus: %s", strerror(-r));
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goto fail;
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}
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if (asprintf(&name, "run-%lu.service", (unsigned long) getpid()) < 0) {
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r = log_oom();
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goto fail;
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}
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r = start_transient_service(bus, name, argv + 1, &error);
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if (r < 0) {
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log_error("Failed start transient service: %s", error.message);
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sd_bus_error_free(&error);
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goto fail;
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}
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fail:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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