Project dependencies are not installed when usedevelop=False

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/197
• Originally reported by: @DXist
• Originally created at: 2014-10-14T14:04:54.987

I run tox without -r option. At he moment I have to manually install project dependencies when they are changed.

Steps I do to reproduce this:

1. run tox to initialize test environment
2. activate test environment
3. remove a package my project depends on
4. run tox again and see failed test due to unsatisfied dependency

When I set usedevelop=True the problem disappears.

[pytoxbot]

Original comment by @DXist

For now I just toggle usedevelop value in my config whenever I add new dependencies. This forces installation of them.

[pytoxbot]

Original comment by @DXist

I'd like to have ini option.

[pytoxbot]

Original comment by @hpk42

maybe, would you rather have an ini or command line opt?

[pytoxbot]

Original comment by @DXist

In my case adding '-r' option makes the build 5-6 times longer - that's why I prefer not to set it. When environment is already prepared pip dependency checks are quite fast and introduce much smaller time overhead than full env recreation.

I think it would be nice to make "--no-deps" option presence configurable.

[pytoxbot]

Original comment by @hpk42

speed for the common case. after all, typing "-r" to force recreation is a bit annoying but not super bad IMHO :)

[pytoxbot]

Original comment by @DXist

Could you explain the reason for this?

[pytoxbot]

Original comment by @hpk42

it does use it but with "--no-deps".

[pytoxbot]

Original comment by @DXist

Thank you for the links! Why does not tox run install_command for sdist'ed tarball? This way it could update dependencies when updates are available.

[pytoxbot]

Original comment by @hpk42

yes, it's a known issue (although i can't find an issue number currently) that tox does not know what setup.py contains in terms of dependencies. We could maybe look into the sdist/package's requirements and see if that changed, however, not sure. There are some issues like issue #13 and issue #149 which are similar.

[pytoxbot]

Original comment by @DXist

I activate .tox/* test environment and manipulate it just to show a possible way to reproduce the issue. My actual problem is that tox doesn't update install_requires dependencies after I changed them in new project version. As I said usedevelop=True fixes it but I'd like to install my project from source distribution and not to use this mode.

[pytoxbot]

Original comment by @hpk42

tox presumes it controls the virtual environments and that you don't do manual changes in between. How comes you work on the .tox/* virtualenvs yourself?