#Common Workflows

#Installation, Update, Uninstallation

In the Nep specification, there are three common workflows:

• Installation workflow (setup.toml)
• Update workflow (update.toml)
• Uninstallation workflow (remove.toml)

When installing a package, ept will invoke the installation workflow of this package;

When uninstalling, ept will invoke the uninstallation workflow of this package and the corresponding reverse workflow of the installation workflow;

The situation during update is slightly more complex:

• If the first author of the two packages before and after the update is the same:
  • If the old package provides an uninstallation workflow, then execute the uninstallation workflow of the old package
  • If the new package provides an update workflow, then execute the update workflow of the new package
  • If the new package does not provide an update workflow and the uninstallation workflow of the old package has been executed, then execute the installation workflow of the new package
• If the first author of the two packages before and after the update is different:
  • First, execute the uninstallation workflow and the corresponding reverse workflow of the installation workflow of the old package, then execute the installation workflow of the new package

#Expandable

In expandable packages, ept will invoke the expandable workflow (expand.toml) before installation or update.