Allow easy overriding of build plugins

snapcraft
1

Currently, changing the behavior of a snapcraft plugin is a complex task. For cases where I only want to override the source of my part, I have to basically implement the download logic myself. Ideally I would have access to the complete yaml config as a python dict where I would only replace the source of my part and call super().pull().

This approach will actually allow us to practically make the yaml config dynamic with very little hassle.

2

Below code is an illustration of what I have in mind.

import platform

from snapcraft.plugins import dump


class DumpCustom(dump.DumpPlugin):
    def pull(self):
        if platform.machine() == 'x86_64':
            self.source = 'http://something.com/some_file.zip'
        super().pull()