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App-Cme-1.034
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/ cme

NAME

cme - Check or edit configuration data with Config::Model

VERSION

version 1.034

SYNOPSIS

# general synopsis
cme [ global_options ] command application [ options ] [ file ] [ modification_instructions ]

# edit dpkg config with GUI (and Config::Model::Dpkg)
cme edit dpkg

# read data from arbitrary file (for model read from alternate file)
cme check dpkg-copyright -file path/to/file

# edit /etc/sshd_config (with Config::Model::OpenSsh)
sudo cme edit sshd

# edit ~/.ssh/config (with Config::Model::OpenSsh)
cme edit ssh

# just check the validity of a file. Both commands are equivalent
cme check multistrap file.conf
cme check multistrap -file file.conf

# check dpkg files, update deprecated parameters and save
cme migrate dpkg

# like migrate, but also apply all suggested fixes
cme fix dpkg

# modify configuration with command line
cme modify dpkg source 'format="(3.0) quilt"'

# likewise with an application that accepts file override
cme modify dpkg-copyright 'Comment="Modified with cme"'

# edit a file (file name specification is mandatory here)
cme edit multistrap my.conf

# map conf data to a fuse file system
cme fusefs multistrap my.conf -d fuse_dir

# likewise for dpkg data
cme fusefs dpkg -d fuse_dir

# list all available applications (depends on your installation)
cme list

DESCRIPTION

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.

list

Show a list all applications where a model is available. This list depends on installed Config::Model modules.

edit

Edit a configuration. By default, a Tk GUI will be opened If Config::Model::TkUI is installed. See App::Cme::Command::edit.

shell

Edit the configuration with a shell like interface. See App::Cme::Command::shell.

check

Checks the content of the configuration file of an application. See App::Cme::Command::check.

migrate

Update deprecated parameters (old value are saved to new parameters) and save the new configuration. See App::Cme::Command::migrate.

fix

Migrate data and fix warnings. See App::Cme::Command::fix.

modify

Modify a configuration file with the values passed on the command line. See App::Cme::Command::modify.

update

Update the content of the configuration file from external data. Currently, only dpkg-copyright model support update sub command. See App::Cme::Command::update.

Search configuration data for a specific string. See App::Cme::Command::search.

fusefs

Map the configuration file content to a FUSE virtual file system on a directory specified with option -fuse-dir. Modifications done in the fuse file system are saved to the configuration file when the fusermount -u is run.

Global 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.

Advanced 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

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.

BUGS

Files may be re-ordered

cme imposes a specific ordering of the parameters of a configuration file. This ordering is derived from the documentation of the configuration, like ssh_confg. cme writes back files using this ordering.

Thus, the diff between the original configuration files and the new version of the file may be more important than expected when cme is used the first time.

Comments may be dropped

Comments are not supported in some applidations (like the one that use YAML in configuration files). Comments are dropped when using cme to edit or modify such files. For more details, see Available backend page.

Configuration models can lag behind the target application

If a configuration model is not up-to-date, you will get errors complaining about unknown parameters. In such a case, please file a bug on github or fix the model and send a pull request. You can see this example from OpenSsh to learn how to fix a model.

FOR MORE INFORMATION

For more information, please check:

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.

SEE ALSO

Config::Model::Model, Config::Model::Instance, Config::Model::Node, Config::Model::HashId, Config::Model::ListId, Config::Model::WarpedNode, Config::Model::Value

AUTHOR

Dominique Dumont

COPYRIGHT AND LICENSE

This software is Copyright (c) 2014-2021 by Dominique Dumont.

This is free software, licensed under:

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