cme1p

Usage

Version

version 1.041

Overview

Depending on the command described below, "cme" program will use Config::Model configuration descriptions to check or modify or fix configuration files.

The 3rd parameter specify the application you want to work on. Most of the time, the relevant configuration file(s) will be found by cme. This is the most simple case. For instance:

  sudo cme check popcon

Some application like "multistrap" have no constraint on the configuration file name and will require you to specify your configuration file name:

  cme check multistrap raspbian.conf

or

  cme check multistrap -file raspbian.conf

Configuration file specification

The configuration of an application can take different forms. Either several files (like debian packages), a single file with a predefined file (popcon), or a single file with an arbitrary file name (multistrap).

When needed the configuration file name is specified as the 3rd command argument, i.e. "cme command application file_name". This applies if the application requires a configuration file name (like multistrap), or if the application allows configuration file override.

Main commands

This section describes the main commands shipped with cme. Other Config::Model extensions can bring more command. Run "cme help" to get the list of available commands on your system.

Options

The following options are available for all commands:

-create

Perform the operation even if the configuration file is missing. This may be used to create a minimal configuration file. This option is disabled by default as a missing configuration file often indicates an error during the installation of the application.

-file

For model that support it, specify an alternate file to read and write the configuration.

You can use this option for model that require the target file to be specified (e.g. multitrap model), but file can in this case be also specified with the 4th command argument. E.g. these 2 commands have the same effect:

  cme check multistrap foo.conf
  cme check multistrap -file foo.conf

-force-load

Load file even if error are found in data. Bad data are discarded

-canonical

Write config data back using model order. By default, write items back using the order found in the configuration file. This feature is experimental and not supported by all backends.

-backup

Create a backup of configuration files before saving. By default, "old" will be appended to the backup file. I.e. "foo.conf" will be backed up as "foo.conf.old". You can specify an alternate suffix. For instance "-backup dpkg-old".

-save

Force a save even if no change was done. Useful to reformat the configuration file.

-strict

When set, cme will exit 1 if warnings are found during check (of left after fix)

-verbose

Show more information about what's going on.

-quiet

Suppress all output except error messages.

Options

-model-dir

Specify an alternate directory to find model files. Mostly useful for tests.

-root-dir

Specify a pseudo root directory to read and write the configuration files. (Actual default directory and file names depends on the model (See "-model" option). For instance, if you specify "~/mytest", the "/etc/ssh/sshd_config" files will be written in "~/mytest/etc/ssh/" directory.

-stack-trace

Provides a full stack trace when exiting on error.

-try-app-as-model

When set, try to load a model using directly the application name specified as 3rd parameter on the command line. Experimental.

Embedding cme

You can use cme from another program by using "-ui simple" option. This way you will be able to send command on the standard input of "cme" and get the results from the standard output.

Logging

All Config::Model logging is now based on Log::Log4perl. Logging can be configured in the following files:

•

 ~/.log4config-model

•

 /etc/log4config-model.conf

A sample of a ".log4config-model" is provided in contrib directory in "Config::Model" distribution of on github <https://github.com/dod38fr/config-model/blob/master/contrib/log4config-model>

Without these files, the following Log4perl config is used:

 log4perl.rootLogger=WARN, Screen
 log4perl.logger.Model.Legacy = INFO, SimpleScreen
 log4perl.additivity.Model.Legacy = 0
 log4perl.appender.Screen        = Log::Log4perl::Appender::Screen
 log4perl.appender.Screen.stderr = 0
 log4perl.appender.Screen.layout = Log::Log4perl::Layout::PatternLayout
 log4perl.appender.Screen.layout.ConversionPattern = %M %m (line %L)%n
 log4perl.appender.SimpleScreen        = Log::Log4perl::Appender::Screen
 log4perl.appender.SimpleScreen.stderr = 0
 log4perl.appender.SimpleScreen.layout = Log::Log4perl::Layout::PatternLayout
 log4perl.appender.SimpleScreen.layout.ConversionPattern = %p: %m%n
 log4perl.oneMessagePerAppender = 1

Log4perl uses the following categories:

Anything

Anything::Change

Trace change notification through configuration tree and instance.

Backend

Backend::Debian::Dpkg

Backend::Debian::Dpkg::Control

Backend::Debian::Dpkg::Copyright

Backend::Fstab

Backend::IniFile

Backend::PlainFile

Backend::ShellVar

Backend::Yaml

FuseUI

Instance

Loader

Model::Searcher

Tree::Element::CheckList

Tree::Element::Id

Tree::Element::Id::Hash

Tree::Element::Id::List

Tree::Element::Value

Tree::Element::Value::Dependency

Tree::Node

Tree::Node::Warped

ValueComputer

Warper

Iterator

Model

More categories will come.

Exit code

cme exits 0 when no errors are found. Exit 1 otherwise.

For more information

For more information, please check:

•

config-model wiki: <http://github.com/dod38fr/config-model/wiki>

•

Blogs about this project: <https://ddumont.wordpress.com/category/perl/configmodel/>

Contributors

In alphabetical order:

 Ross Vandegrift

Feedbacks

Feedback from users are highly desired. If you find this module useful, please share your use cases, success stories with the author.

Copyright and license

This software is Copyright (c) 2014-2022 by Dominique Dumont <[email protected]>.

This is free software, licensed under:

  The GNU Lesser General Public License, Version 2.1, February 1999