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Anatomy of an App

This section provides a technical review of a ClearOS app:

  • Where files are installed
  • Packaging information
  • Naming conventions

Naming Conventions

Every app has a simple basename that is used as a keyword across various systems. For example, the Base app uses the basename base.

System Example
Packaging app-certificate-manager-2.4.24-1.v7.noarch
Marketplace Certificate Manager
Documentation Certificate Manager Docs
Bug Tracker List of issues
Translations Certificate Manager app in Dutch

File and Directory Locations

An app uses the traditional Linux file system layout, so you can find an app installed in the locations defined in the following table.

Location Type Purpose
/etc/clearos/basename File Simple configuration file (optional)
/etc/clearos/basename.d Directory Configlet files (optional)
/usr/clearos/apps/basename/ Directory Core software, libraries and GUI (required)
/var/clearos/basename Directory State files (optional)

Two Software Packages: Core Libraries and GUI

In many circumstances, a ClearOS app may need to use a library from another app. For example, the PPTP Server requires bits and pieces from the Samba library. For this reason, every app is packaged into two distinct RPMs:

  1. app-basename-core: core libraries
  2. app-basename: GUI frontend

When the PPTP Server is installed, it will pull in the app-samba-core library, but not the whole Samba GUI frontend.