—

              
#!perl
# Note: This script is a CLI for Riap function /Systemd/Util/systemd_is_running
# and generated automatically using Perinci::CmdLine::Gen version 0.490
our $DATE = '2019-05-22'; # DATE
our $DIST = 'App-SystemdUtils'; # DIST
our $VERSION = '0.001'; # VERSION
use 5.010001;
use strict;
use warnings;
use Perinci::CmdLine::Any;
my $cmdline = Perinci::CmdLine::Any->new(
    url => "/Systemd/Util/systemd_is_running",
    program_name => "systemd-is-running",
    read_config => 0,
    read_env => 0,
);
$cmdline->run;
# ABSTRACT: Check if systemd is running
# PODNAME: systemd-is-running
__END__
HideShow 166 lines of Pod
=pod
=encoding UTF-8
=head1 NAME
systemd-is-running - Check if systemd is running
=head1 VERSION
This document describes version 0.001 of systemd-is-running (from Perl distribution App-SystemdUtils), released on 2019-05-22.
=head1 SYNOPSIS
Usage:
 % systemd-is-running [options]
=head1 DESCRIPTION
Will return payload of 1 if systemd is running, 0 if not running, C<undef> if
cannot determine for sure. The result metadata C<func.note> will give more
details. The following heuristics are currently used:
=over
=item 1. Check if /sbin/init exists, if it does not the return 0.
=item 2. Check if /sbin/init is a symlink to something with /systemd/ in its name. If
yes, then we return 1. We use L<Cwd>'s C<realpath()> instead of C<readlink()>
here, to handle multiple redirection.
=item 3. Check if /lib/systemd/systemd exists. Return 0 otherwise.
=item 4. Check if /sbin/init is a hardlink to /lib/systemd/systemd by comparing its
inode. Return 1 if it is.
=item 5. Return undef otherwise, since we detect that /lib/systemd/systemd exists
(systemd is installed) but we cannot be sure if it is running or not.
=back
When used as a CLI, this routine will exit 0 if systemd is running, 1 if systemd
is not running, or 99 if cannot determine for sure. To see the more detailed
note, you can run the CLI with C<--json> to return the whole enveloped response.
=head1 OPTIONS
C<*> marks required options.
=head2 Output options
=over
=item B<--format>=I<s>
Choose output format, e.g. json, text.
Default value:
 undef
=item B<--json>
Set output format to json.
=item B<--naked-res>
When outputing as JSON, strip result envelope.
Default value:
 0
By default, when outputing as JSON, the full enveloped result is returned, e.g.:
    [200,"OK",[1,2,3],{"func.extra"=>4}]
The reason is so you can get the status (1st element), status message (2nd
element) as well as result metadata/extra result (4th element) instead of just
the result (3rd element). However, sometimes you want just the result, e.g. when
you want to pipe the result for more post-processing. In this case you can use
`--naked-res` so you just get:
    [1,2,3]
=back
=head2 Other options
=over
=item B<--help>, B<-h>, B<-?>
Display help message and exit.
=item B<--version>, B<-v>
Display program's version and exit.
=back
=head1 COMPLETION
This script has shell tab completion capability with support for several
shells.
=head2 bash
To activate bash completion for this script, put:
 complete -C systemd-is-running systemd-is-running
in your bash startup (e.g. F<~/.bashrc>). Your next shell session will then
recognize tab completion for the command. Or, you can also directly execute the
line above in your shell to activate immediately.
It is recommended, however, that you install modules using L<cpanm-shcompgen>
which can activate shell completion for scripts immediately.
=head2 tcsh
To activate tcsh completion for this script, put:
 complete systemd-is-running 'p/*/`systemd-is-running`/'
in your tcsh startup (e.g. F<~/.tcshrc>). Your next shell session will then
recognize tab completion for the command. Or, you can also directly execute the
line above in your shell to activate immediately.
It is also recommended to install L<shcompgen> (see above).
=head2 other shells
For fish and zsh, install L<shcompgen> as described above.
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/App-SystemdUtils>.
=head1 SOURCE
Source repository is at L<https://github.com/perlancar/perl-App-SystemdUtils>.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=App-SystemdUtils>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2019 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut