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Systemd/src/run/run.c
Lennart Poettering 6c12b52e19 core: add new "scope" unit type for making a unit of pre-existing processes 
"Scope" units are very much like service units, however with the
difference that they are created from pre-existing processes, rather
than processes that systemd itself forks off. This means they are
generated programmatically via the bus API as transient units rather
than from static configuration read from disk. Also, they do not provide
execution-time parameters, as at the time systemd adds the processes to
the scope unit they already exist and the parameters cannot be applied
anymore.

The primary benefit of this new unit type is to create arbitrary cgroups
for worker-processes forked off an existing service.

This commit also adds a a new mode to "systemd-run" to run the specified
processes in a scope rather then a transient service.
2013-07-01 00:18:00 +02:00

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/*-*- 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 <getopt.h>
#include "sd-bus.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "strv.h"
#include "build.h"
#include "unit-name.h"
static bool arg_scope = false;
static bool arg_user = false;
static const char *arg_unit = NULL;
static int help(void) {
printf("%s [OPTIONS...] [COMMAND LINE...]\n\n"
"Notify the init system about service status updates.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --user Run as user unit\n"
" --scope Run this as scope rather than service\n"
" --unit=UNIT Run under the specified unit name\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_USER,
ARG_SCOPE,
ARG_UNIT
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "user", no_argument, NULL, ARG_USER },
{ "scope", no_argument, NULL, ARG_SCOPE },
{ "unit", required_argument, NULL, ARG_UNIT },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_USER:
arg_user = true;
break;
case ARG_SCOPE:
arg_scope = true;
break;
case ARG_UNIT:
arg_unit = optarg;
break;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (optind >= argc) {
log_error("Command line to execute required.");
return -EINVAL;
}
return 1;
}
static int message_start_transient_unit_new(sd_bus *bus, const char *name, sd_bus_message **ret) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r;
log_info("Running as unit %s.", name);
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;
*ret = m;
m = NULL;
return 0;
}
static int message_start_transient_unit_send(sd_bus *bus, sd_bus_message *m, sd_bus_error *error, sd_bus_message **reply) {
int 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);
}
static int start_transient_service(
sd_bus *bus,
char **argv,
sd_bus_error *error) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
_cleanup_free_ char *name = NULL;
char **i;
int r;
if (arg_unit)
name = unit_name_mangle_with_suffix(arg_unit, ".service");
else
asprintf(&name, "run-%lu.service", (unsigned long) getpid());
if (!name)
return -ENOMEM;
r = message_start_transient_unit_new(bus, name, &m);
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;
return message_start_transient_unit_send(bus, m, error, &reply);
}
static int start_transient_scope(
sd_bus *bus,
char **argv,
sd_bus_error *error) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
_cleanup_free_ char *name = NULL;
int r;
if (arg_unit)
name = unit_name_mangle_with_suffix(arg_unit, ".scope");
else
asprintf(&name, "run-%lu.scope", (unsigned long) getpid());
if (!name)
return -ENOMEM;
r = message_start_transient_unit_new(bus, name, &m);
if (r < 0)
return r;
r = sd_bus_message_append(m, "sv", "PIDs", "au", 1, (uint32_t) getpid());
if (r < 0)
return r;
r = message_start_transient_unit_send(bus, m, error, &reply);
if (r < 0)
return r;
execvp(argv[0], argv);
log_error("Failed to execute: %m");
return -errno;
}
int main(int argc, char* argv[]) {
sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_bus_unref_ sd_bus *bus = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto fail;
if (arg_user)
r = sd_bus_open_user(&bus);
else
r = sd_bus_open_system(&bus);
if (r < 0) {
log_error("Failed to create new bus connection: %s", strerror(-r));
goto fail;
}
if (arg_scope)
r = start_transient_scope(bus, argv + optind, &error);
else
r = start_transient_service(bus, argv + optind, &error);
if (r < 0) {
log_error("Failed start transient unit: %s", error.message);
sd_bus_error_free(&error);
goto fail;
}
fail:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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