heat-agents/heat-config-apply-config/README.rst

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A hook which invokes os-apply-config.
The intent is for this element (hook script) to be used in place of the one in
tripleo-image-elements which relies on an external signal handling
shell script at the end of the os-refresh-config run (99-refresh-completed).
This version will run os-apply-config and return a signal immediately. Because
it uses the heat-hook mechanisms it also supports a broader set of signal
handling capabilities... which 99-refresh-completed doesn't fully support.
It is worth noting that this hook runs os-apply-config against all the
accumulated metadata, not just data supplied to an individual hook.
To use this hook set group: to 'apply-config' instead of 'os-apply-config'
in your Heat software configuration resources.