NAME

       dh_cme_upgrade - add cme based configuration merge

SYNOPSIS

        dh_cme_upgrade [ debhelper options ] [ -p pkg ]

DESCRIPTION

       dh_cme_upgrade is experimental

       dh_cme_upgrade is a debhelper that will modify the package script to merge configuration
       on package upgrade. This merge is based on cme from Config::Model and will merge user's
       customisations with maintainer's configuration updates. This provides another way to
       preserve users modifications during upgrades.

       Configuration information used by cme for upgrade are specified in a configuration file
       (see below)

       Configuration information is specified in a configuration model. It must be provided by
       another package like "libconfig-model-lcdproc-perl"

REQUIREMENTS

       For this program to work, package maintainer must make sure that:

       •   "*.postinst", "*.postrm" and "*.config" have a "#DEBHELPER#"  line (if these files
           exist)

       •   "control" file has a dependency on "${misc:Depends}"

       •   Configuration files upgraded by "cme" must not be conffiles. Any default configuration
           file provided by upstream must not be installed directly in "/etc". They should be
           installed in "/usr/share/doc/" for reference. "cme" will create a default
           configuration file during package installation.

OPTIONS

       This program accepts all debhelper options, including the "-p" option to specify which
       package(s) to act on.

Usage

       "dh_cme_upgrade" is designed be called in the rules file via the dh command:

        %:
          dh --with cme_upgrade

       No options can be passed to "dh_cme_upgrade". Its configuration must be specified in
       "debian/*.config_model" file. This file contains several lines, each in the form of "key:
       value".

       Here are the possible keys:

       cme-app-name
           Specifies the application or model name (X la "Config::Model") that will be used to
           perform the upgrade. (mandatory)

       cme-model-package
           Specifies the debian package that provide the model specified by "cme-app-name".
           (mandatory)

       cme-model-version
           Specifies the minimal version of the package that provides the model.  (optional)

       cme-command
           Specify the command passed to cme. Defaults to "migrate". Another useful value is
           "fix" which will migrate and fix the configuration file.

       cme-options
           Specify a list of options or command that will be passed verbatim to cme during
           upgrade. (optional)

       cme-purge
           Specify the configuration files or directory to be removed when purging the package.
           E.g "/etc/LCDd.conf*" or "/etc/java/". Several files or directory can be purged by
           using a shell glob.  If this option is empty, configuration files handled by cme will
           be left as-is after a purge.

Examples

       Here's a possible configuration for openssh server:

        $ cat debian/openssh-server.config-model
        cme-app-name: sshd
        cme-model-package: lib-config-model-openssh-perl
        cme-model-version: 1.206

       For lcdproc:

        $ cat debian/lcdproc.config-model
        cme-app-name: lcdproc
        cme-package: libconfig-model-lcdproc-perl
        cme-model-version: 2.040
        # required to upgrade LCDd.conf from upstream configuration
        cme-options: -force
        cme-purge: /etc/LCDd.conf*

       For Popcon:

        $ cat debian/popcon.config-model
        cme-app-name: popcon
        cme-model-package: libconfig-model-perl

debian files setup

       "dh_cme_upgrade" will work only if:

       •   "control" file contains a "S{misc:Depends}" variable in "Depends" line

       •   "rules" contains a "#DEBHELPER#" line to insert generated postinst snippet

ENVIRONMENT

       This program will exit(0) if "DH_NO_ACT" is set or if "DEB_BUILD_OPTIONS" contains
       "noconfigmodel".

SEE ALSO

       debhelper

       This program is an addendum to debhelper (part of libconfig-model-perl).

AUTHOR

       Dominique Dumont <dod@debian.org>