Action scripts

The criu can call your hooks on various stages of dumping/restoring. These hooks are added with the --action-script shell-code-to-execute option. When called, the CRTOOLS_SCRIPT_ACTION environment is set to a value determining which type of action is performed. It can be one of

network-lock

request to lock an LXC container network

network-unlock

requested to unlock an LXC container network

post-dump

called when CRIU finished dumping tasks before unfreezing them

setup-namespaces

called when the root task is alive and new set of namespaces is created to set them up

RPC

In case or RPC, action scripts are implemented as notifications -- once CRIU service wants to execute a script it send an RPC message to caller and waits for it to respond with criu_req message having notify_success = true.