Add always-unzip and no-deps options to install command

[ghost]

Originally reported by: jaraco (Bitbucket: jaraco, GitHub: jaraco)

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In pip 1749, it appears that setuptools could better support the use cases of pip by providing two new options, --always-unzip and --no-deps, to the install command.

What are the implications of adding such options? Would they simply fall through to easy_install? Could the same behavior be invoked using existing behavior, such as through setopt, e.g.:

python setup.py setopt -c easy_install -o always-unzip -s 1 install

While ugly, I believe that behavior would work today.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/206

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Note, I haven't even tested the idea described above. It may well be incorrect or impossible, but I did want to present that possibility.

[ghost]

Original comment by dstufft (Bitbucket: dstufft, GitHub: dstufft):

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I've never even seen setopt before, so I'm not sure what it does :)

Essentially what pip needs in order to sanely support the --egg option, is the ability to get all of the semantics of --single-version-externally-managed except installed as an egg. I think that the imports parts are installing unzipped and installing without deps, but there may be more to it.

[asmodehn]

I also have a usecase where I would like to be able to do
setup.py install --single-version-externally-managed --root --no-deps.

I am currently using --single-version-externally-managed and --root as well but it is not clear to me if these bring in dependencies or not (I would like them not to). The documentation doesn't say anything about it.

I think I have seen them bringing in dependencies (Cant be sure, I have been switching a lot between different versions of setuptools) but it seems they don't (#570) ?

[benoit-pierre]

Pip non longer support --egg.