For each object maintain parent-child relationship graph, i.e. list of
parent objects ('parents' property) and list of children objects ('children'
property).
Objects without parent(s) are objects specified in init manifest.
Objects without children are object of types that do not reuse other types.
This makes it easier for new and experienced users to run cdist with higher
verbosity levels, both to know that things are working as expected and to debug
issues.
Documentation has been modified accordingly and default behaviour is not
changed.
CDIST_ORDER_DEPENDENCY now defines type order dependency context.
cdist (emulator) maintains global state variables, as files,
order_dep_state and typeorder_dep, and per object state variable,
as file, typeorder_dep.
If order_dep_state exists then this defines that order dependency is
turned on.
If order_dep_state does not exist then order dependency is turned off.
If order dependency is on then objects created after it is turned on are
recorded into:
* global typeorder_dep, in case of init manifest
* object's typeorder_dep, in case of type's manifest.
If order dependency is on then requirement is injected, where object
created before current, is read from:
* global typeorder_dep, in case of init manifest
* object's typeorder_dep, in case of type's manifest.
Every time order dependency is turned off, typeorder_dep files are
removed, which means that type order list is cleared, context is
cleaned.
In the end cdist cleans after itself, i.e. mentioned files are removed.
When running type manifest is finished typeorder_dep file is removed.
When running config finishes global typeorder_dep and order_dep_state
files are removed.
Global type order recording is untouched.
Furthermore, for completeness, type order is now recorded for each object
too.
Remote::transfer contains a call to mkdir(destination) if the source is
a directory. since the destination must also be a directory we can omit
extra mkdir calls in Explorer.
this saves about 10% on my manifests in sequential mode, and about 6% in
parallel mode.
