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New 'extended_start_script_hooks' directive that allows the
developer to define six different hook shell scripts to be invoked
at pre/post start/stop/install upgrade phases.
Besides these custom defined scripts, other types of builtin
scripts are also available, these offer pre-packaged functionality
that can be used directly, they are:
pid - writes the beam pid to a configurable file location
(/var/run/<rel_name>.pid by default).
wait_for_vm_start - waits for the vm to start (ie. when it responds to pings)
wait_for_process - waits for a configurable name
to appear in the erlang process registry
The hook scripts are invoked with the 'source' command, therefore
they have access to all the variables in the start script.
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