The idea is that:
- entropy.* imports will work as before (so any 3rd party clients will
work as always) - installed in "entropy" package,
- new "_entropy" package to hold a namespace for private modules (like
ones that required adding special directories to sys.path).
(Underscored name for a top level Python module is not very common...
anyway, it was inspired by "_emerge.")
Layout:
site-packages/
entropy (backwards compatible)
const.py
...
kswitch (also toplevel to keep compatibility)
...
_entropy
eit
magneto
matter
rigo
RigoDaemon
solo
(Note that site-packages does not need to be actually Python's
site-packages directory but anything as it is controlled by an argument
to make. It is however intended to be the sitedir.)
Another idea for a layout would be one that mimics sources checkout, but
the layout there is somewhat scattered. (And some ugliness would be
needed to make them modules before implicit namespaces from Python 3.3.
Anyway, imports would be long and ugly.)
Now, the layout of installed Entropy is lean; installation to virtualenv
is also possible (though there would be a need to call scripts like
"python equo.py" as shebangs are not converted).
Follow up changes are needed to make it work.
After this commit alone it would not work when installed (unless module
paths are set in a special way). Next changes will introduce
installation to site-packages so no custom PYTHONPATH will be necessary.
This way a proper separation between Python installs can be achieved.
With no PYTHON_SITEDIR, installation paths are exactly the same as
before this change.
In practise, passing nonstandard path will break Entropy but so it is
also with the currently available LIBDIR. This is a concern of a future
improvement (at least the PYTHON_SITEDIR path, not necessarily LIBDIR as
PYTHON_SITEDIR *will* be different if it's installed in Python specific
directories).
For convenience (seemingly, and it really is convenient) equo and other
tools can be run from the checkout, and Entropy modules are loaded from
the checkout. Now there is a strict separation when system paths and
when paths from the checkout are used.
It makes it a bit more robust, secure and preditable at the cost of
a little more complexity.
A pleasant side effect of this change is that it is not required to
change directory to the tool (to use non-system one), as paths in the
checkout are relative to scripts.
Imports in lib/tests were not adjusted.
This tweak makes possible to directly skip depgraph generation if
the root node (the dependency to check, last node of the toposorted
queue) is already up-to-date (wrt to stable: yes, for example).
This is what Portage does internally (using backupenv) and may break
in future releases without notice. So, keep the settings["ACCEPT_KEYWORDS"]
setup as a guard, to ensure the safety property.
If a particle contains the depstring "www-apps/bugzilla", do not
just match the best available, which would include only the latest
slotted version but rather go through all the slotted versions
available and apply filters from there. The net result is that
we will never leave slotted packages behind.
