First-Generation Managed Packaging Developer Guide

First-Generation Managed Packages
Why Switch to Second-Generation Managed Packaging?
Move to 2GP: Migrate Your Managed Packages with Ease
Register a Namespace for a First-Generation Managed Package
Create a First-Generation Managed Package Using a UI
Create a First-Generation Managed Package using Salesforce DX
Components Available in First-Generation Managed Packages
Behavior of Specific Metadata in First-Generation Managed Packages
Package and Test Your First-Generation Managed Package
Install a Managed Package
Install First-Generation Managed Packages Using Metadata API
Component Availability After Deployment
Install Notifications for Unauthorized Managed Packages
Resolve Apex Test Failures
Run Apex on Package Install/Upgrade
How Does a Post Install Script Work?
Example of a Post Install Script
Specifying a Post Install Script
Run Apex on Package Uninstall
Uninstall a First-Generation Managed Package
Update Your First-Generation Managed Package
Publish Upgrades to First-Generation Managed Packages
Manage Licenses for Managed Packages
Manage Features in First-Generation Managed Packages
AgentExchange App Analytics for First-Generation Managed Packages
Developing and Distributing Unmanaged Packages
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Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Specifying a Post Install Script

After you’ve created and tested the post install script, you can specify it in the Post Install Script lookup field on the Package Detail page. In subsequent patch releases, you can change the contents of the script but not the Apex class.

The class selection is also available via the Metadata API as Package.postInstallClass. This is represented in package.xml as a <postInstallClass>foo</postInstallClass> element.