summaryrefslogtreecommitdiff
path: root/src/grp-journal/systemd-cat
diff options
context:
space:
mode:
Diffstat (limited to 'src/grp-journal/systemd-cat')
-rw-r--r--src/grp-journal/systemd-cat/cat.c161
-rw-r--r--src/grp-journal/systemd-cat/systemd-cat.completion.bash57
-rw-r--r--src/grp-journal/systemd-cat/systemd-cat.completion.zsh12
-rw-r--r--src/grp-journal/systemd-cat/systemd-cat.xml178
4 files changed, 408 insertions, 0 deletions
diff --git a/src/grp-journal/systemd-cat/cat.c b/src/grp-journal/systemd-cat/cat.c
new file mode 100644
index 0000000000..93ab6e7f96
--- /dev/null
+++ b/src/grp-journal/systemd-cat/cat.c
@@ -0,0 +1,161 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 <fcntl.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <systemd/sd-journal.h>
+
+#include "fd-util.h"
+#include "parse-util.h"
+#include "string-util.h"
+#include "syslog-util.h"
+#include "util.h"
+
+static const char *arg_identifier = NULL;
+static int arg_priority = LOG_INFO;
+static bool arg_level_prefix = true;
+
+static void help(void) {
+ printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+ "Execute process with stdout/stderr connected to the journal.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " -t --identifier=STRING Set syslog identifier\n"
+ " -p --priority=PRIORITY Set priority value (0..7)\n"
+ " --level-prefix=BOOL Control whether level prefix shall be parsed\n"
+ , program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_LEVEL_PREFIX
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "identifier", required_argument, NULL, 't' },
+ { "priority", required_argument, NULL, 'p' },
+ { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case 't':
+ if (isempty(optarg))
+ arg_identifier = NULL;
+ else
+ arg_identifier = optarg;
+ break;
+
+ case 'p':
+ arg_priority = log_level_from_string(optarg);
+ if (arg_priority < 0) {
+ log_error("Failed to parse priority value.");
+ return -EINVAL;
+ }
+ break;
+
+ case ARG_LEVEL_PREFIX: {
+ int k;
+
+ k = parse_boolean(optarg);
+ if (k < 0)
+ return log_error_errno(k, "Failed to parse level prefix value.");
+
+ arg_level_prefix = k;
+ break;
+ }
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_close_ int fd = -1, saved_stderr = -1;
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
+ if (fd < 0) {
+ r = log_error_errno(fd, "Failed to create stream fd: %m");
+ goto finish;
+ }
+
+ saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
+
+ if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
+ dup3(fd, STDERR_FILENO, 0) < 0) {
+ r = log_error_errno(errno, "Failed to duplicate fd: %m");
+ goto finish;
+ }
+
+ if (fd >= 3)
+ safe_close(fd);
+ fd = -1;
+
+ if (argc <= optind)
+ (void) execl("/bin/cat", "/bin/cat", NULL);
+ else
+ (void) execvp(argv[optind], argv + optind);
+ r = -errno;
+
+ /* Let's try to restore a working stderr, so we can print the error message */
+ if (saved_stderr >= 0)
+ (void) dup3(saved_stderr, STDERR_FILENO, 0);
+
+ log_error_errno(r, "Failed to execute process: %m");
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
diff --git a/src/grp-journal/systemd-cat/systemd-cat.completion.bash b/src/grp-journal/systemd-cat/systemd-cat.completion.bash
new file mode 100644
index 0000000000..8d84042af1
--- /dev/null
+++ b/src/grp-journal/systemd-cat/systemd-cat.completion.bash
@@ -0,0 +1,57 @@
+# systemd-cat(1) completion -*- shell-script -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2014 Thomas H.P. Andersen
+#
+# 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
+# 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/>.
+
+__contains_word() {
+ local w word=$1; shift
+ for w in "$@"; do
+ [[ $w = "$word" ]] && return
+ done
+}
+
+_systemd_cat() {
+ local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
+ local i verb comps
+
+ local -A OPTS=(
+ [STANDALONE]='-h --help --version'
+ [ARG]='-t --identifier -p --priority --level-prefix'
+ )
+
+ _init_completion || return
+
+ if __contains_word "$prev" ${OPTS[ARG]}; then
+ case $prev in
+ --identifier|-t)
+ comps=''
+ ;;
+ --priority|-p)
+ comps='emerg alert crit err warning notice info debug'
+ ;;
+ --level-prefix)
+ comps='yes no'
+ ;;
+ esac
+ COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
+ return 0
+ fi
+
+ COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") )
+}
+
+complete -F _systemd_cat systemd-cat
diff --git a/src/grp-journal/systemd-cat/systemd-cat.completion.zsh b/src/grp-journal/systemd-cat/systemd-cat.completion.zsh
new file mode 100644
index 0000000000..7487b00ee8
--- /dev/null
+++ b/src/grp-journal/systemd-cat/systemd-cat.completion.zsh
@@ -0,0 +1,12 @@
+#compdef systemd-cat
+
+local curcontext="$curcontext" state lstate line
+_arguments \
+ {-h,--help}'[Show this help]' \
+ '--version[Show package version.]' \
+ {-t+,--identifier=}'[Set syslog identifier.]:syslog identifier:' \
+ {-p+,--priority=}'[Set priority value.]:value:({0..7})' \
+ '--level-prefix=[Control whether level prefix shall be parsed.]:boolean:(1 0)' \
+ ':Message'
+
+#vim: set ft=zsh sw=4 ts=4 et
diff --git a/src/grp-journal/systemd-cat/systemd-cat.xml b/src/grp-journal/systemd-cat/systemd-cat.xml
new file mode 100644
index 0000000000..160db9fb5c
--- /dev/null
+++ b/src/grp-journal/systemd-cat/systemd-cat.xml
@@ -0,0 +1,178 @@
+<?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 2012 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-cat"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>systemd-cat</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-cat</refentrytitle>
+ <manvolnum>1</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-cat</refname>
+ <refpurpose>Connect a pipeline or program's output with the journal</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis>
+ <command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg> <arg>COMMAND</arg> <arg choice="opt" rep="repeat">ARGUMENTS</arg></command>
+ </cmdsynopsis>
+ <cmdsynopsis>
+ <command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg></command>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><command>systemd-cat</command> may be used to connect the
+ standard input and output of a process to the journal, or as a
+ filter tool in a shell pipeline to pass the output the previous
+ pipeline element generates to the journal.</para>
+
+ <para>If no parameter is passed, <command>systemd-cat</command>
+ will write everything it reads from standard input (stdin) to the
+ journal.</para>
+
+ <para>If parameters are passed, they are executed as command line
+ with standard output (stdout) and standard error output (stderr)
+ connected to the journal, so that all it writes is stored in the
+ journal.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The following options are understood:</para>
+
+ <variablelist>
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+
+ <varlistentry>
+ <term><option>-t</option></term>
+ <term><option>--identifier=</option></term>
+
+ <listitem><para>Specify a short string that is used to
+ identify the logging tool. If not specified, no identification
+ string is written to the journal.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-p</option></term>
+ <term><option>--priority=</option></term>
+
+ <listitem><para>Specify the default priority level for the
+ logged messages. Pass one of
+ <literal>emerg</literal>,
+ <literal>alert</literal>,
+ <literal>crit</literal>,
+ <literal>err</literal>,
+ <literal>warning</literal>,
+ <literal>notice</literal>,
+ <literal>info</literal>,
+ <literal>debug</literal>, or a
+ value between 0 and 7 (corresponding to the same named
+ levels). These priority values are the same as defined by
+ <citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ Defaults to <literal>info</literal>. Note that this simply
+ controls the default, individual lines may be logged with
+ different levels if they are prefixed accordingly. For details,
+ see <option>--level-prefix=</option> below.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--level-prefix=</option></term>
+
+ <listitem><para>Controls whether lines read are parsed for
+ syslog priority level prefixes. If enabled (the default), a
+ line prefixed with a priority prefix such as
+ <literal>&lt;5&gt;</literal> is logged at priority 5
+ (<literal>notice</literal>), and similar for the other
+ priority levels. Takes a boolean argument.</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Exit status</title>
+
+ <para>On success, 0 is returned, a non-zero failure code
+ otherwise.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Invoke a program</title>
+
+ <para>This calls <filename noindex='true'>/bin/ls</filename>
+ with standard output and error connected to the journal:</para>
+
+ <programlisting># systemd-cat ls</programlisting>
+ </example>
+
+ <example>
+ <title>Usage in a shell pipeline</title>
+
+ <para>This builds a shell pipeline also invoking
+ <filename>/bin/ls</filename> and writes the output it generates
+ to the journal:</para>
+
+ <programlisting># ls | systemd-cat</programlisting>
+ </example>
+
+ <para>Even though the two examples have very similar effects the
+ first is preferable since only one process is running at a time,
+ and both stdout and stderr are captured while in the second
+ example, only stdout is captured.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>logger</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>