404 lines
12 KiB
C
404 lines
12 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 <getopt.h>
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#include "sd-bus.h"
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#include "bus-util.h"
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#include "strv.h"
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#include "build.h"
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#include "unit-name.h"
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#include "path-util.h"
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#include "bus-error.h"
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static bool arg_scope = false;
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static bool arg_remain_after_exit = false;
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static const char *arg_unit = NULL;
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static const char *arg_description = NULL;
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static const char *arg_slice = NULL;
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static bool arg_send_sighup = false;
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static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
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static char *arg_host = NULL;
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static bool arg_user = false;
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static int help(void) {
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printf("%s [OPTIONS...] COMMAND [ARGS...]\n\n"
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"Run the specified command in a transient scope or service unit.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --user Run as user unit\n"
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" -H --host=[USER@]HOST Operate on remote host\n"
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" -M --machine=CONTAINER Operate on local container\n"
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" --scope Run this as scope rather than service\n"
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" --unit=UNIT Run under the specified unit name\n"
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" --description=TEXT Description for unit\n"
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" --slice=SLICE Run in the specified slice\n"
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" -r --remain-after-exit Leave service around until explicitly stopped\n"
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" --send-sighup Send SIGHUP when terminating\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_USER,
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ARG_SYSTEM,
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ARG_SCOPE,
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ARG_UNIT,
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ARG_DESCRIPTION,
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ARG_SLICE,
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ARG_SEND_SIGHUP,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "user", no_argument, NULL, ARG_USER },
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{ "system", no_argument, NULL, ARG_SYSTEM },
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{ "scope", no_argument, NULL, ARG_SCOPE },
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{ "unit", required_argument, NULL, ARG_UNIT },
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{ "description", required_argument, NULL, ARG_DESCRIPTION },
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{ "slice", required_argument, NULL, ARG_SLICE },
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{ "remain-after-exit", no_argument, NULL, 'r' },
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{ "send-sighup", no_argument, NULL, ARG_SEND_SIGHUP },
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{ "host", required_argument, NULL, 'H' },
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{ "machine", required_argument, NULL, 'M' },
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{},
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "+hrH:M:", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case ARG_USER:
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arg_user = true;
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break;
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case ARG_SYSTEM:
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arg_user = false;
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break;
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case ARG_SCOPE:
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arg_scope = true;
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break;
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case ARG_UNIT:
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arg_unit = optarg;
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break;
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case ARG_DESCRIPTION:
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arg_description = optarg;
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break;
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case ARG_SLICE:
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arg_slice = optarg;
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break;
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case ARG_SEND_SIGHUP:
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arg_send_sighup = true;
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break;
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case 'r':
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arg_remain_after_exit = true;
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break;
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case 'H':
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arg_transport = BUS_TRANSPORT_REMOTE;
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arg_host = optarg;
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break;
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case 'M':
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arg_transport = BUS_TRANSPORT_CONTAINER;
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arg_host = optarg;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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}
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if (optind >= argc) {
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log_error("Command line to execute required.");
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return -EINVAL;
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}
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if (arg_user && arg_transport != BUS_TRANSPORT_LOCAL) {
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log_error("Execution in user context is not supported on non-local systems.");
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return -EINVAL;
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}
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if (arg_scope && arg_transport != BUS_TRANSPORT_LOCAL) {
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log_error("Scope execution is not supported on non-local systems.");
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return -EINVAL;
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}
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return 1;
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}
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static int message_start_transient_unit_new(sd_bus *bus, const char *name, sd_bus_message **ret) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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log_info("Running as unit %s.", name);
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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_append(m, "(sv)", "Description", "s", arg_description);
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if (r < 0)
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return r;
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if (!isempty(arg_slice)) {
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_cleanup_free_ char *slice;
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slice = unit_name_mangle_with_suffix(arg_slice, ".slice");
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if (!slice)
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return -ENOMEM;
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r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
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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_append(m, "(sv)", "SendSIGHUP", "b", arg_send_sighup);
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if (r < 0)
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return r;
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*ret = m;
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m = NULL;
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return 0;
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}
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static int message_start_transient_unit_send(sd_bus *bus, sd_bus_message *m, sd_bus_error *error, sd_bus_message **reply) {
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int 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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static int start_transient_service(
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sd_bus *bus,
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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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_cleanup_free_ char *name = NULL;
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char **i;
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int r;
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if (arg_unit)
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name = unit_name_mangle_with_suffix(arg_unit, ".service");
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else
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asprintf(&name, "run-%lu.service", (unsigned long) getpid());
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if (!name)
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return -ENOMEM;
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r = message_start_transient_unit_new(bus, name, &m);
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "(sv)", "RemainAfterExit", "b", arg_remain_after_exit);
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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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return message_start_transient_unit_send(bus, m, error, &reply);
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}
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static int start_transient_scope(
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sd_bus *bus,
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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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_cleanup_free_ char *name = NULL;
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int r;
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if (arg_unit)
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name = unit_name_mangle_with_suffix(arg_unit, ".scope");
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else
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asprintf(&name, "run-%lu.scope", (unsigned long) getpid());
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if (!name)
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return -ENOMEM;
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r = message_start_transient_unit_new(bus, name, &m);
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, (uint32_t) getpid());
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if (r < 0)
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return r;
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r = message_start_transient_unit_send(bus, m, error, &reply);
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if (r < 0)
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return r;
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execvp(argv[0], argv);
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log_error("Failed to execute: %m");
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return -errno;
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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 *description = NULL, *command = NULL;
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int r;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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r = find_binary(argv[optind], &command);
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if (r < 0) {
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log_error("Failed to find executable %s: %s", argv[optind], strerror(-r));
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goto finish;
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}
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argv[optind] = command;
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if (!arg_description) {
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description = strv_join(argv + optind, " ");
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if (!description) {
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r = log_oom();
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goto finish;
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}
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arg_description = description;
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}
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r = bus_open_transport(arg_transport, arg_host, arg_user, &bus);
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if (r < 0) {
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log_error("Failed to create bus connection: %s", strerror(-r));
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goto finish;
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}
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if (arg_scope)
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r = start_transient_scope(bus, argv + optind, &error);
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else
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r = start_transient_service(bus, argv + optind, &error);
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if (r < 0) {
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log_error("Failed start transient unit: %s", error.message ? error.message : strerror(-r));
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sd_bus_error_free(&error);
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goto finish;
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}
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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