Add possibility to install dependencies to target directory. pip -t flag analogue

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Feature Request

Add possibility to install dependencies to target directory. pip -t flag analogue.

The proposed command example is

poetry install -t ./vendor

[stevekrasinsky]

Another vote for the AWS Lambda use case.

[RobbieClarken]

could you please add a use case, where you think this feature would be useful?

I’m interested in this feature to be able to download and build python packages as part of deploying to AWS Lambda. In order to deploy to Lambda you need to zip up your source code and dependencies and upload them to an S3 bucket. My build currently involves doing:

poetry export -f requirements.txt --without-hashes > requirements.txt
pip install -r requirements.txt -t ./bundle/

The --without-hashes is needed or I get an error when I pip install:

ERROR: In --require-hashes mode, all requirements must have their versions pinned with ==. These do not:
    setuptools>=39.2.0 from https://files.pythonhosted.org/packages/a0/df/635cdb901ee4a8a42ec68e480c49f85f4c59e8816effbf57d9e6ee8b3588/setuptools-46.1.3-py3-none-any.whl#sha256=4fe404eec2738c20ab5841fa2d791902d2a645f32318a7850ef26f8d7215a8ee (from cairocffi==1.1.0->-r requirements.txt (line 1))

It would be nice to be able to run something like:

poetry install -t ./bundle/

This would have the advantage of verifying hashes, simplifying the build and removing the direct dependency on pip.