Travis: Fix requirements install

[geky]

pip requires --user flag when installing executables outside of sudo context

see #5055
cc @0xc0170, @theotherjimmy

[0xc0170]

Is there any doc reference for this? Is also the fix referenced above needed or this supersedes it?

[geky]

So what I can find on the python side: https://www.python.org/dev/peps/pep-0370/

Basically, pip install tries to install in the python library path. This is usually in an admin-only location that requires sudo (default on ubuntu), but could be somewhere that every user has write access to if you like living life on the edge.

They added pip install --user for user-local installs which should never require sudo, but they couldn't change the default behavior for backwards compatibility.

Options are use sudo pip install or pip install --user. Unfortunately virtualenvs cause problems for sudo pip install, though I'm not aware of all the details. I ran into an issue earlier that travis wasn't putting sudo pip install in the python path, it's fixed now, but pip install --user seems more reliable.

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Is also the fix referenced above needed or this supersedes it?

Good point, will remove

[Nodraak]

Should not we have a requirements-travis.txt or requirements-test.txt file for theses? If not, why don't we install all packages in one pip install command?

[geky]

I don't think this list is big enough to need another level of indirection IMO.

I can run these all in one command though.

[geky]

Ok, for some reason combining all of the requirements into one pip install command caused travis to fail. I couldn't figure out why.

[Nodraak]

If I am right, the error is from six import wraps - ImportError: cannot import name wraps.
Here I found that Mock requires six version 1.7 or newer.
I think you should add pip install --upgrade six to upgrade the already installed six to the newest version.

Anyway, I'm being picky, if it's good enough for mbed's maintainers, let's merge as it is :)

[geky]

Huh, then why would pip work in this configuration?

[Nodraak]

hum yeah, you are right ... no idea ¯(°_o)/¯

[geky]

@0xc0170, this is probably ready, won't need morph test either

[theotherjimmy]

2X travis builds. This must be extra safe!