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#
# (c) Jan Gehring <jan.gehring@gmail.com>
#
HideShow 21 lines of Pod
=head1 NAME
Rex::Commands::Tail - Tail a file
Version <= 1.0: All these functions will not be reported.
All these functions are not idempotent.
=head1 DESCRIPTION
With this module you can tail a file.
=head1 SYNOPSIS
 tail "/var/log/syslog";
=head1 EXPORTED FUNCTIONS
=cut
package Rex::Commands::Tail;
use v5.12.5;
use warnings;
our $VERSION = '1.16.0'; # VERSION
require Rex::Exporter;
use Data::Dumper;
use Rex::Commands::Fs;
use Rex::Commands::File;
#use Rex::Helper::Run;
use Rex::Commands::Run;
use vars qw(@EXPORT);
use base qw(Rex::Exporter);
@EXPORT = qw(tail);
HideShow 24 lines of Pod
=head2 tail($file)
This function will tail the given file.
 task "syslog", "server01", sub {
   tail "/var/log/syslog";
 };
If you want to control the output format, you can define a callback function:
 task "syslog", "server01", sub {
   tail "/var/log/syslog", sub {
    my ($data) = @_;
    my $server = Rex->get_current_connection()->{'server'};
    print "$server>> $data\n";
   };
 };
=cut
sub tail {
  my $file     = shift;
  my $callback = shift;
  $callback ||= sub {
    print $_[0];
  };
  Rex::Logger::debug("Tailing: $file");
  run "tail -f $file", continuous_read => sub {
    $callback->(@_);
    },
    ;
}
1;