Changes

# walk through the sources tree to collect all configuration source files for each supported service;

# walk through the sources tree to collect all configuration source files for each supported service;

# apply the particular service configuration by saving files, the backup copies will be kept;

# apply configuration by writing sources content to proper configuration files for particular service on particular OS, the backup copies will be kept;

# ask mace provider of particular service to make sure that everything, related to this service, is good, e.g., check if Prosody SSL keys/certificates exist and are not expired, or check if Squid's swap is created;

# ask mace provider of particular service to make sure that everything, related to this service, is good, e.g., check if Prosody SSL keys/certificates exist and are not expired, or check if Squid's swap is created;

# if a new configuration is different from a previous one, or if step 3 changed something in the system, restart this service;

# if a new configuration is different from a previous one, or if step 3 changed something in the system, restart this service;

# make sure that service will be started at boot time;

# make sure that service will be started at boot time;

# if all the previous steps aborted due to failures, revert to the original configuration.

# if all the previous steps aborted due to failures, revert to the original configuration.

== Testing routines ==

== Testing routines ==