Rex::Config(3pm)

NAME
Rex::Config - Handles Rex configuration

SYNOPSIS
 use Rex::Config;

 # set a config option
 Rex::Config->set_exec_autodie(TRUE);

 # get value of a config option
 my $user = Rex::Config->get_user();

DESCRIPTION
This module holds all configuration options for Rex, and also allows you to specify your own ones for your modules.

Please take a look at Rex::Commands first, which provides convenience wrappers for many of these options.

While it's possible to use the methods below to set a configuration option directly, their main intended purpose is to be used as internal plumbing, and to provide an escape hatch in case there are no better alternatives.

EXPORTED METHODS

  set_autodie

  get_autodie
Sets and gets the value of the $autodie configuration variable.

This controls whether Rex should die() if there's an error while executing file system commands that are supposed to change the contents.

Default is "undef".

  set_use_net_openssh_if_present

  get_use_net_openssh_if_present
Sets and gets the value of the $use_net_openssh_if_present configuration variable.

This controls whether Rex should use Net::OpenSSH for connections if that is available.

Default is "undef".

  set_use_rex_kvm_agent

  get_use_rex_kvm_agent
Sets and gets the value of the $use_rex_kvm_agent configuration variable.

This controls whether Rex should setup and use a serial device for the experimental Rex KVM agent <https://github.com/RexOps/rex-kvm-agent> for managed VMs.

Default is "undef".

  set_use_template_ng

  get_use_template_ng
Sets and gets the value of the $use_template_ng configuration variable.

This controls whether Rex should use Rex::Template::NG to render templates.

Default is "undef".

  set_set_no_append

  get_set_no_append
Sets and gets the value of the $set_no_append configuration variable.

This controls whether Rex should overwrite or append values of configuration options when using the set command.

Default is "undef".

  set_check_service_exists

  get_check_service_exists
Sets and gets the value of the $check_service_exists configuration variable.

This controls whether Rex should die() early if it is asked to manage a service that doesn't exist.

Default is "undef".

  set_register_cmdb_template

  get_register_cmdb_template
Sets and gets the value of the $register_cmdb_template configuration variable.

This controls whether Rex should make CMDB data available to be used in templates as variables.

Default is "undef".

  set_fallback_auth

  get_fallback_auth
Sets and gets the value of the $fallback_auth configuration variable.

This can be used to define an array of hash references, each of them containing authentication details to be tried during connection attempts when the directly specified ones fail.

Default is "undef".

  set_task_call_by_method

  get_task_call_by_method
Sets and gets the value of the $task_call_by_method configuration variable.

This controls whether calling tasks as a method is allowed or not.

Default is "undef".

  set_disable_taskname_warning

  get_disable_taskname_warning
Sets and gets the value of the $disable_taskname_warning configuration variable.

This controls whether Rex should show or suppress the warning message about task names that can not be used as Perl identifiers.

Default is "undef".

  set_task_chaining_cmdline_args

  get_task_chaining_cmdline_args
Sets and gets the value of the $task_chaining_cmdline_args configuration variable.

This controls whether Rex should parse task arguments on the command line per task, or should pass all arguments to all tasks.

Default is "undef".

  set_verbose_run

  get_verbose_run
Sets and gets the value of the $verbose_run configuration variable.

This controls whether Rex should show verbose output about executed run commands. This means an error message if the command is not found, a warning message if the exit code indicates an error, and an informational message upon success.

Default is "undef".

  set_exec_autodie

  get_exec_autodie
Sets and gets the value of the $exec_autodie configuration variable.

This controls whether Rex should die() or not when the exit code of executed run command indicate an error.

Default is "undef".

  set_no_path_cleanup

  get_no_path_cleanup
Sets and gets the value of the $no_path_cleanup configuration variable.

This controls whether Rex should use either the default or the explicitly configured "PATH" settings (via path or set_path) when executing commands or not.

Default is "undef".

  set_source_profile

  get_source_profile
Sets and gets the value of the $source_profile configuration variable.

This controls whether Rex should source shell-specific profile files before executing commands.

Default is "undef".

  set_say_format

  get_say_format
Sets and gets the value of the $say_format configuration variable.

This controls the output format of the built-in "say" command (see also sayformat).

Default is "undef".

  set_do_reporting

  get_do_reporting
Sets and gets the value of the $do_reporting configuration variable.

This controls whether Rex should do reporting on executed resources where it is supported. This only affects the data structures returned internally.

Default is "undef".

  set_report_type

  get_report_type
Sets and gets the value of the $report_type configuration variable, which can also be controlled via the "REX_REPORT_TYPE" environment variable.

This selects the reporting type (format) Rex should use, e.g. 'YAML'.

Default is "undef".

  set_sleep_hack

  get_sleep_hack
Sets and gets the value of the $sleep_hack configuration variable.

This controls whether Rex should use or not an extra 10 ns long sleep after executed commands.

This might help working around an issue when Rex runs inside a KVM virtualized host and Net::SSH2/libssh2 <https://www.libssh2.org> is used to connect to another VM on the same hardware.

Default is "undef".

  set_cache_type

  get_cache_type
Sets and gets the value of the $cache_type configuration variable, which can also be controlled via the "REX_CACHE_TYPE" environment variable.

This selects the cache type Rex should use, e.g. 'YAML'.

Default is 'Base'.

  set_use_cache

  get_use_cache
Sets and gets the value of the $use_cache configuration variable.

This controls whether Rex should use caching or not for runtime information like CMDB contents, hardware and operating system information, or the shell type that is being used to execute commands on the managed endpoint.

Default is "undef".

  set_openssh_opt

  get_openssh_opt
Sets and gets the value of the $openssh_opt configuration variable, which holds a hash of the SSH configuration options used for the connection. See the ssh_config(5) man page <http://man.openbsd.org/OpenBSD-current/man5/ssh_config.5> for the available options.

  Rex::Config->set_openssh_opt( $option => $value, );

There is a custom option named "initialize_options" specific to Rex, which can be used to pass a hash reference describing the constructor parameters <https://metacpan.org/pod/Net::OpenSSH#Net::OpenSSH->new($host,-%opts)> for the underlying Net::OpenSSH object:

 Rex::Config->set_openssh_opt( initialize_options => { $parameter => $value, } );

Default is "undef".

  set_sudo_without_locales

  get_sudo_without_locales
Sets and gets the value of the $sudo_without_locales configuration variable.

This controls whether Rex should execute sudo commands without setting any locales via the "LC_ALL" environment variable.

Warning: if the locale is something else than "C" or "en_US", then things will break!

Default is "undef".

  set_sudo_without_sh

  get_sudo_without_sh
Sets and gets the value of the $sudo_without_sh configuration variable.

This controls whether Rex should run sudo commands without "sh". This might break things.

Default is "undef".

  set_executor_for

  get_executor_for
Sets and gets the keys and values of the %executor_for configuration variable.

This sets the executor for a given file type when using the upload_and_run() function of Rex::Helper::Run module.

Default is:

 (
   perl   => 'perl',
   python => 'python',
   ruby   => 'ruby',
   bash   => 'bash',
 )

  set_tmp_dir

  get_tmp_dir
Sets and gets the value of the $tmp_dir configuration variable.

This controls which directory Rex should use for temporary files.

Default is determined by the following logic:

•   try to use what "File::Spec->tmpdir" would return on the managed endpoint

•   fall back to '/tmp'

  set_path

  get_path
Sets and gets the value of the $path configuration variable.

This controls which "PATH" Rex should use when executing commands via the Rex::Commands::Run module.

The value should be set as an array reference, and will be dereferenced as such before returned by "get_path". The path command is a convenience wrapper for "set_path", and accepts an array.

Default is

 qw(
   /usr/gnu/bin
   /bin
   /sbin
   /usr/bin
   /usr/sbin
   /usr/local/bin
   /usr/local/sbin
   /usr/pkg/bin
   /usr/pkg/sbin
 )

  set_user

  get_user
Sets and gets the value of the $user configuration variable, which also can be set via the "REX_USER" environment variable.

This controls which user Rex should use for authentication.

Default is determined by the following logic:

•   value of "REX_USER" environment variable

•   user set by user command

•   user running Rex

  set_password

  get_password
Sets and gets the value of the $password configuration variable, which also can be set via the "REX_PASSWORD" environment variable.

This controls what password Rex should use for authentication or as passphrase when using private keys.

Default is "undef".

  set_port

  get_port
Sets and gets the value of the $port configuration variable.

This controls which port Rex should connect to.

"get_port" accepts an optional "server => $server" argument to return the "port" setting for the given $server as optionally set in group files.

Default is "undef".

  set_sudo_password

  get_sudo_password
Sets and gets the value of the $sudo_password configuration variable, which can also be controlled via the "REX_SUDO_PASSWORD" environment variable.

This controls what sudo password Rex should use.

Default is determined by the following logic:

•   value of "REX_SUDO_PASSWORD" environment variable

•   sudo password set by the sudo_password command

•   password set by the password command

•   empty string ('')

  set_source_global_profile

  get_source_global_profile
Sets and gets the value of the $source_global_profile configuration variable.

This controls whether Rex should source "/etc/profile" before executing commands.

Default is "undef".

  set_max_connect_fails

  get_max_connect_fails
Sets and gets the value of the $max_connect_fails configuration variable.

This controls how many times Rex should retry to connect before giving up.

"get_max_connect_fails" accepts an optional "server => $server" argument to "connectionattempts" setting for the given $server as optionally set in group files.

Default is "undef".

  set_proxy_command

  get_proxy_command
Sets and gets the value of the $proxy_command configuration variable.

This controls the SSH ProxyCommand Rex should set for connections when Net::OpenSSH is used.

"get_proxy_command" accepts an optional "server => $server" argument to return the "proxycommand" setting for the given $server as optionally set in group files.

Default is "undef".

  set_timeout

  get_timeout
Sets and gets the value of the $timeout configuration variable.

This controls how many seconds Rex should wait for connections to succeed when using SSH or Rex::Commands::Rsync.

"get_timeout" accepts an optional "server => $server" argument to return the "connecttimeout" setting for the given $server as optionally set in group files.

Default is "undef".

  set_password_auth

  get_password_auth
Sets and gets the value of the $password_auth configuration variable, which can also be set by setting the "REX_AUTH_TYPE" environment variable to "pass".

This controls whether Rex should use the password authentication method.

Default is "undef".

  set_key_auth

  get_key_auth
Sets and gets the value of the $key_auth configuration variable, which can also be set by setting the "REX_AUTH_TYPE" environment variable to "key".

This controls whether Rex should use the key authentication method.

Default is "undef".

  set_krb5_auth

  get_krb5_auth
Sets and gets the value of the $krb5_auth configuration variable, which can also be set by setting the "REX_AUTH_TYPE" environment variable to "krb5".

This controls whether Rex should use the Kerberos 5 authentication method.

Default is "undef".

  set_public_key

  get_public_key
Sets and gets the value of the $public_key configuration variable.

This controls which public key Rex should use when using Net::SSH2 for connections.

Default is "undef".

  set_private_key

  get_private_key
Sets and gets the value of the $private_key configuration variable.

This controls which private key Rex should use with Rex::Commands::Rsync or when using Net::SSH2 for connections.

Default is "undef".

  set_parallelism

  get_parallelism
Sets and gets the value of the $parallelism configuration variable.

This controls how many hosts Rex should connect to in parallel.

Default is 1.

  set_log_filename

  get_log_filename
Sets and gets the value of the $log_filename configuration variable.

This controls which file Rex should use for logging.

Default is "undef".

  set_log_facility

  get_log_facility
Sets and gets the value of the $log_facility configuration variable.

This controls which log facility Rex should use when logging to syslog.

Default is 'local0'.

  set_environment

  get_environment
Sets and gets the value of the $environment configuration variable.

This controls which environment Rex should use.

Default is ''.

  set_distributor

  get_distributor
Sets and gets the value of the $distributor configuration variable.

This controls which method Rex should use for distributing tasks for parallel execution.

Default is 'Base'.

  set_template_function

  get_template_function
Sets and gets the value of the $template_function configuration variable.

This controls the function to be used for rendering templates. The value should be a subroutine reference that will be called with passing two scalar references as positional arguments: first is template content, second is template variables.

Default is determined by the following logic:

•   if Rex::Template::NG is loadable and use_template_ng is true, use that

•   fall back to Rex::Template otherwise

  set_no_tty

  get_no_tty
Sets and gets the value of the $no_tty configuration variable.

This controls whether Rex should request a terminal when using Net::SSH2 or allocate a pseudo-tty for the remote process when using Net::OpenSSH.

Default is "undef".

  set_allow_empty_groups

  get_allow_empty_groups
Sets and gets the value of the $allow_empty_groups configuration variable.

This controls whether Rex should allow empty groups of hosts or not.

Default is 0.

  set_use_server_auth

  get_use_server_auth
Sets and gets the value of the $use_server_auth configuration variable.

This controls whether Rex should use server-specific authentication information from group files.

Default is 0.

  set_waitpid_blocking_sleep_time

  get_waitpid_blocking_sleep_time
Sets and gets the value of the $waitpid_blocking_sleep_time configuration variable.

This controls how many seconds Rex should sleep between checking forks.

Default is 0.1.

  set_write_utf8_files

  get_write_utf8_files
Sets and gets the value of the $write_utf8_files configuration variable.

This controls whether Rex should force "UTF-8" encoding when writing files.

Default is "undef".

  set_default_auth

  get_default_auth
Sets and gets the value of the $default_auth configuration variable.

This controls whether Rex should attach default authentication info to tasks.

Default is 1.

  set_augeas_commands_prepend

  get_augeas_commands_prepend
Sets and gets the value of the $augeas_commands_prepend configuration variable.

This controls the list of commands Rex should prepend at the beginning of the command file for Augeas operations.

Default is "[]".

  set_local_augeas_backend

  get_local_augeas_backend
Sets and gets the value of the $local_augeas_backend configuration variable.

This controls which Augeas backend to use for local operations, "augtool" or "Config::Augeas".

Default is "Config::Augeas".

  register_set_handler($handler_name, $code)
Register a handler that gets called by set.

 Rex::Config->register_set_handler("foo", sub {
   my ($value) = @_;
   print "The user set foo -> $value\n";
 });

And now you can use this handler in your Rexfile like this:

 set foo => "bar";

  register_config_handler($topic, $code)
With this function it is possible to register own sections in the users config file ("$HOME/.rex/config.yml").

Example:

 Rex::Config->register_config_handler("foo", sub {
  my ($param) = @_;
  print "bar is: " . $param->{bar} . "\n";
 });

And now the user can set this in his configuration file:

 base:
   user: theuser
   password: thepassw0rd
 foo:
   bar: baz