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Knowledge Base

Installing and Uninstalling System Packages

 
extensions guidetesting extensionsextensionstestingtips

It is important to make sure that by installing and uninstalling system
packages the extension does not break Plesk’s normal functioning.

Handling unsupported operating systems

The extension must check whether the OS it is being installed on is
supported or not. If it is not, the extension must clearly communicate
it to the user in an error message. Naturally, in this case, the
extension must not be installed.

Here is the list of operating systems currently supported by Plesk:
Supported operating
systems
.

Installing packages

When implementing the process of installing extension’s packages, take
into consideration the following guidelines.

  1. Show a clear warning to the user that packages will be installed with
    the extension, which will alter the current state of the system. The
    user must be explicitly made aware of the changes. Optionally, the
    installed packages may be listed for the user’s convenience.
  2. Before installing, the extension must check whether the packages it
    requires are already installed or not. If they are, they must not be
    installed again.
  3. Check that the packages and dependencies to be installed are not
    conflicting with packages already installed on the system. If such
    conflicts exist, the user must be explicitly informed of this fact.
  4. Make sure that all the necessary packages and package repositories
    are installed.
  5. Make sure that all the dependencies and corresponding repositories
    are installed.
  6. Make sure there are no errors reported in panel.log

Testing tips:

  1. New packages and repositories must be available to install on all
    operating systems and versions of Plesk supported by the extension.
  2. Installing the packages does not break any of the related Plesk
    functionality.
  3. Make sure there are no errors reported in panel.log

Use long tasks to install packages

The process of installation takes considerable time. Plesk provides the
mechanism of long tasks exactly for the situations like
this.

Uninstalling extensions or packages through extension

  1. Ideally, the system should be reverted back to the state prior to the
    extension installation.
  2. All packages, dependencies and repositories installed by the
    extension must be removed at uninstall.
  3. System packages installed before the extension packages must not be
    removed.
  4. Plesk repositories must remain available and present on the
    repositories list.
  5. Plesk must work.
  6. Make sure there are no errors reported in panel.log
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