The AbstractInstallCommand class is accessible via the paste.script.appinstall module.
[(False, '/home/ianb/.paste/config/sysconfig.py'), (False, '/etc/paste/sysconfig.py'), (False, '/usr/local/etc/paste/sysconfig.py'), (True, 'paste.script.default_sysconfig')]
Return the value of the given option in the first sysconfig module in which it is found, or default (None) if not found in any.
Return the option value for the given name in all the sysconfig modules in which is is found ([] if none).
Call the specified function in the first sysconfig module it is defined in. NameError if no function is found.
Call all the named functions in the sysconfig modules, returning a list of the return values.
Return the folded results of calling the install_variables() functions.
This gets a distribution object, and installs the distribution if required.
See the source for more information.