/*-*- 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 .
***/
#include
#include
#include "sd-bus.h"
#include "bus-util.h"
#include "strv.h"
#include "build.h"
#include "unit-name.h"
#include "path-util.h"
#include "bus-error.h"
static bool arg_scope = false;
static bool arg_remain_after_exit = false;
static const char *arg_unit = NULL;
static const char *arg_description = NULL;
static const char *arg_slice = NULL;
static bool arg_send_sighup = false;
static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
static char *arg_host = NULL;
static bool arg_user = false;
static int help(void) {
printf("%s [OPTIONS...] COMMAND [ARGS...]\n\n"
"Run the specified command in a transient scope or service unit.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --user Run as user unit\n"
" -H --host=[USER@]HOST Operate on remote host\n"
" -M --machine=CONTAINER Operate on local container\n"
" --scope Run this as scope rather than service\n"
" --unit=UNIT Run under the specified unit name\n"
" --description=TEXT Description for unit\n"
" --slice=SLICE Run in the specified slice\n"
" -r --remain-after-exit Leave service around until explicitly stopped\n"
" --send-sighup Send SIGHUP when terminating\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_USER,
ARG_SYSTEM,
ARG_SCOPE,
ARG_UNIT,
ARG_DESCRIPTION,
ARG_SLICE,
ARG_SEND_SIGHUP,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "user", no_argument, NULL, ARG_USER },
{ "system", no_argument, NULL, ARG_SYSTEM },
{ "scope", no_argument, NULL, ARG_SCOPE },
{ "unit", required_argument, NULL, ARG_UNIT },
{ "description", required_argument, NULL, ARG_DESCRIPTION },
{ "slice", required_argument, NULL, ARG_SLICE },
{ "remain-after-exit", no_argument, NULL, 'r' },
{ "send-sighup", no_argument, NULL, ARG_SEND_SIGHUP },
{ "host", required_argument, NULL, 'H' },
{ "machine", required_argument, NULL, 'M' },
{},
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+hrH:M:", options, NULL)) >= 0) {
switch (c) {
case 'h':
return help();
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_USER:
arg_user = true;
break;
case ARG_SYSTEM:
arg_user = false;
break;
case ARG_SCOPE:
arg_scope = true;
break;
case ARG_UNIT:
arg_unit = optarg;
break;
case ARG_DESCRIPTION:
arg_description = optarg;
break;
case ARG_SLICE:
arg_slice = optarg;
break;
case ARG_SEND_SIGHUP:
arg_send_sighup = true;
break;
case 'r':
arg_remain_after_exit = true;
break;
case 'H':
arg_transport = BUS_TRANSPORT_REMOTE;
arg_host = optarg;
break;
case 'M':
arg_transport = BUS_TRANSPORT_CONTAINER;
arg_host = optarg;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
}
if (optind >= argc) {
log_error("Command line to execute required.");
return -EINVAL;
}
if (arg_user && arg_transport != BUS_TRANSPORT_LOCAL) {
log_error("Execution in user context is not supported on non-local systems.");
return -EINVAL;
}
if (arg_scope && arg_transport != BUS_TRANSPORT_LOCAL) {
log_error("Scope execution is not supported on non-local systems.");
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_append(m, "(sv)", "Description", "s", arg_description);
if (r < 0)
return r;
if (!isempty(arg_slice)) {
_cleanup_free_ char *slice;
slice = unit_name_mangle_with_suffix(arg_slice, ".slice");
if (!slice)
return -ENOMEM;
r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
if (r < 0)
return r;
}
r = sd_bus_message_append(m, "(sv)", "SendSIGHUP", "b", arg_send_sighup);
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;
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, "(sv)", "RemainAfterExit", "b", arg_remain_after_exit);
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;
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;
_cleanup_free_ char *description = NULL, *command = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
r = find_binary(argv[optind], &command);
if (r < 0) {
log_error("Failed to find executable %s: %s", argv[optind], strerror(-r));
goto finish;
}
argv[optind] = command;
if (!arg_description) {
description = strv_join(argv + optind, " ");
if (!description) {
r = log_oom();
goto finish;
}
arg_description = description;
}
r = bus_open_transport(arg_transport, arg_host, arg_user, &bus);
if (r < 0) {
log_error("Failed to create bus connection: %s", strerror(-r));
goto finish;
}
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 ? error.message : strerror(-r));
sd_bus_error_free(&error);
goto finish;
}
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}