diff options
Diffstat (limited to 'src/grp-utils/systemd-notify')
| -rw-r--r-- | src/grp-utils/systemd-notify/notify.c | 203 | ||||
| -rw-r--r-- | src/grp-utils/systemd-notify/systemd-notify.completion.zsh | 12 | ||||
| -rw-r--r-- | src/grp-utils/systemd-notify/systemd-notify.xml | 185 |
3 files changed, 400 insertions, 0 deletions
diff --git a/src/grp-utils/systemd-notify/notify.c b/src/grp-utils/systemd-notify/notify.c new file mode 100644 index 0000000000..b18fb5938f --- /dev/null +++ b/src/grp-utils/systemd-notify/notify.c @@ -0,0 +1,203 @@ +/*** + This file is part of systemd. + + Copyright 2010 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 <errno.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <systemd/sd-daemon.h> + +#include "alloc-util.h" +#include "env-util.h" +#include "formats-util.h" +#include "log.h" +#include "parse-util.h" +#include "string-util.h" +#include "strv.h" +#include "util.h" + +static bool arg_ready = false; +static pid_t arg_pid = 0; +static const char *arg_status = NULL; +static bool arg_booted = false; + +static void help(void) { + printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n" + "Notify the init system about service status updates.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --ready Inform the init system about service start-up completion\n" + " --pid[=PID] Set main pid of daemon\n" + " --status=TEXT Set status text\n" + " --booted Check if the system was booted up with systemd\n", + program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_READY = 0x100, + ARG_VERSION, + ARG_PID, + ARG_STATUS, + ARG_BOOTED, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "ready", no_argument, NULL, ARG_READY }, + { "pid", optional_argument, NULL, ARG_PID }, + { "status", required_argument, NULL, ARG_STATUS }, + { "booted", no_argument, NULL, ARG_BOOTED }, + {} + }; + + 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: + return version(); + + case ARG_READY: + arg_ready = true; + break; + + case ARG_PID: + + if (optarg) { + if (parse_pid(optarg, &arg_pid) < 0) { + log_error("Failed to parse PID %s.", optarg); + return -EINVAL; + } + } else + arg_pid = getppid(); + + break; + + case ARG_STATUS: + arg_status = optarg; + break; + + case ARG_BOOTED: + arg_booted = true; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + } + + if (optind >= argc && + !arg_ready && + !arg_status && + !arg_pid && + !arg_booted) { + help(); + return -EINVAL; + } + + return 1; +} + +int main(int argc, char* argv[]) { + _cleanup_free_ char *status = NULL, *cpid = NULL, *n = NULL; + _cleanup_strv_free_ char **final_env = NULL; + char* our_env[4]; + unsigned i = 0; + int r; + + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + goto finish; + + if (arg_booted) + return sd_booted() <= 0; + + if (arg_ready) + our_env[i++] = (char*) "READY=1"; + + if (arg_status) { + status = strappend("STATUS=", arg_status); + if (!status) { + r = log_oom(); + goto finish; + } + + our_env[i++] = status; + } + + if (arg_pid > 0) { + if (asprintf(&cpid, "MAINPID="PID_FMT, arg_pid) < 0) { + r = log_oom(); + goto finish; + } + + our_env[i++] = cpid; + } + + our_env[i++] = NULL; + + final_env = strv_env_merge(2, our_env, argv + optind); + if (!final_env) { + r = log_oom(); + goto finish; + } + + if (strv_length(final_env) <= 0) { + r = 0; + goto finish; + } + + n = strv_join(final_env, "\n"); + if (!n) { + r = log_oom(); + goto finish; + } + + r = sd_pid_notify(arg_pid ? arg_pid : getppid(), false, n); + if (r < 0) { + log_error_errno(r, "Failed to notify init system: %m"); + goto finish; + } else if (r == 0) { + log_error("No status data could be sent: $NOTIFY_SOCKET was not set"); + r = -EOPNOTSUPP; + } + +finish: + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} diff --git a/src/grp-utils/systemd-notify/systemd-notify.completion.zsh b/src/grp-utils/systemd-notify/systemd-notify.completion.zsh new file mode 100644 index 0000000000..910ddfa34c --- /dev/null +++ b/src/grp-utils/systemd-notify/systemd-notify.completion.zsh @@ -0,0 +1,12 @@ +#compdef systemd-notify + +local curcontext="$curcontext" state lstate line +_arguments \ + {-h,--help}'[Show this help]' \ + '--version[Show package version]' \ + '--ready[Inform the init system about service start-up completion.]' \ + '--pid=[Inform the init system about the main PID of the daemon]:daemon main PID:_pids' \ + '--status=[Send a free-form status string for the daemon to the init systemd]:status string:' \ + '--booted[Returns 0 if the system was booted up with systemd]' + +#vim: set ft=zsh sw=4 ts=4 et diff --git a/src/grp-utils/systemd-notify/systemd-notify.xml b/src/grp-utils/systemd-notify/systemd-notify.xml new file mode 100644 index 0000000000..a5f4077166 --- /dev/null +++ b/src/grp-utils/systemd-notify/systemd-notify.xml @@ -0,0 +1,185 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2010 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/>. +--> + +<refentry id="systemd-notify" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-notify</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-notify</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-notify</refname> + <refpurpose>Notify service manager about start-up completion and other daemon status changes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-notify <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt" rep="repeat">VARIABLE=VALUE</arg></command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>systemd-notify</command> may be called by daemon + scripts to notify the init system about status changes. It can be + used to send arbitrary information, encoded in an + environment-block-like list of strings. Most importantly, it can be + used for start-up completion notification.</para> + + <para>This is mostly just a wrapper around + <function>sd_notify()</function> and makes this functionality + available to shell scripts. For details see + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + + <para>The command line may carry a list of environment variables + to send as part of the status update.</para> + + <para>Note that systemd will refuse reception of status updates + from this command unless <varname>NotifyAccess=all</varname> is + set for the service unit this command is called from.</para> + + </refsect1> + + <refsect1> + <title>Options</title> + + <para>The following options are understood:</para> + + <variablelist> + <varlistentry> + <term><option>--ready</option></term> + + <listitem><para>Inform the init system about service start-up + completion. This is equivalent to <command>systemd-notify + READY=1</command>. For details about the semantics of this + option see + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--pid=</option></term> + + <listitem><para>Inform the init system about the main PID of + the daemon. Takes a PID as argument. If the argument is + omitted, the PID of the process that invoked + <command>systemd-notify</command> is used. This is equivalent + to <command>systemd-notify MAINPID=$PID</command>. For details + about the semantics of this option see + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--status=</option></term> + + <listitem><para>Send a free-form status string for the daemon + to the init systemd. This option takes the status string as + argument. This is equivalent to <command>systemd-notify + STATUS=...</command>. For details about the semantics of this + option see + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--booted</option></term> + + <listitem><para>Returns 0 if the system was booted up with + systemd, non-zero otherwise. If this option is passed, no + message is sent. This option is hence unrelated to the other + options. For details about the semantics of this option, see + <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>. An + alternate way to check for this state is to call + <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> + with the <command>is-system-running</command> command. It will + return <literal>offline</literal> if the system was not booted + with systemd. </para></listitem> + </varlistentry> + + <xi:include href="standard-options.xml" xpointer="help" /> + <xi:include href="standard-options.xml" xpointer="version" /> + </variablelist> + + </refsect1> + + <refsect1> + <title>Exit status</title> + + <para>On success, 0 is returned, a non-zero failure code + otherwise.</para> + </refsect1> + + <refsect1> + <title>Example</title> + + <example> + <title>Start-up Notification and Status Updates</title> + + <para>A simple shell daemon that sends start-up notifications + after having set up its communication channel. During runtime it + sends further status updates to the init system:</para> + + <programlisting>#!/bin/bash + +mkfifo /tmp/waldo +systemd-notify --ready --status="Waiting for data..." + +while : ; do + read a < /tmp/waldo + systemd-notify --status="Processing $a" + + # Do something with $a ... + + systemd-notify --status="Waiting for data..." +done</programlisting> + </example> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |