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authorLennart Poettering <lennart@poettering.net>2013-06-28 04:12:58 +0200
committerLennart Poettering <lennart@poettering.net>2013-06-28 04:12:58 +0200
commitc2756a68401102786be343712c0c35acbd73d28d (patch)
tree64af93633ce57982937323c9a55fe1ecbf076cd1 /src/run/run.c
parent1508e85878cff23a220b2ff8d6c71418e19797de (diff)
core: add transient units
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.
Diffstat (limited to 'src/run/run.c')
-rw-r--r--src/run/run.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/run/run.c b/src/run/run.c
new file mode 100644
index 0000000000..9f8bda48af
--- /dev/null
+++ b/src/run/run.c
@@ -0,0 +1,156 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 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 <stdio.h>
+
+#include "sd-bus.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "strv.h"
+
+static int start_transient_service(
+ sd_bus *bus,
+ const char *name,
+ char **argv,
+ sd_bus_error *error) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+ char **i;
+ int r;
+
+ r = sd_bus_message_new_method_call(
+ bus,
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ "StartTransientUnit", &m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "ss", name, "fail");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "(sv)");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'r', "sv");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "s", "ExecStart");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'v', "a(sasb)");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "(sasb)");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'r', "sasb");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "s", argv[0]);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "s");
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, argv) {
+ r = sd_bus_message_append(m, "s", *i);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "b", false);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send_with_reply_and_block(bus, m, 0, error, &reply);
+}
+
+int main(int argc, char* argv[]) {
+ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_bus_unref_ sd_bus *bus = NULL;
+ _cleanup_free_ char *name = NULL;
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ if (argc < 2) {
+ log_error("Missing command line.");
+ r = -EINVAL;
+ goto fail;
+ }
+
+ r = sd_bus_open_user(&bus);
+ if (r < 0) {
+ log_error("Failed to create new bus: %s", strerror(-r));
+ goto fail;
+ }
+
+ if (asprintf(&name, "run-%lu.service", (unsigned long) getpid()) < 0) {
+ r = log_oom();
+ goto fail;
+ }
+
+ r = start_transient_service(bus, name, argv + 1, &error);
+ if (r < 0) {
+ log_error("Failed start transient service: %s", error.message);
+ sd_bus_error_free(&error);
+ goto fail;
+ }
+
+fail:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}