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Script Hooks

Trident allows for users to run custom scripts at three different points during installation and update.

Pre-Servicing Scripts​

Pre-servicing scripts are run before Trident begins any operations. They are run inside the servicing OS. Pre-servicing scripts are useful for:

  • Saving the state of the servicing OS.
  • Validating the state of the system before Trident starts servicing, i.e. checking for the presence of certain services.

Post-Provision Scripts​

Post-provision scripts are run inside the servicing OS. This script is run with root filesystem of the target OS mounted at $TARGET_ROOT and other partitions specified for the target OS mounted relative to that. Post-provision scripts are useful for:

  • Migrating configuration to the target OS.

Post-Configure Scripts​

Post-configure scripts are run inside the target OS. Post-configure scripts are useful for:

  • Setting attributes or permissions for users.
  • Installing packages required for expected workloads.