Support python3 for tpm2-tools v4

[nullr0ute]

Python is used in a couple of places, primarily in the tests, but also in some of the configure checks for the build. With python2 going EOL at the end of this year and a lot of Linux distros actively moving to python3 as their default (or not shipping a /usr/bin/python binary) the tpm2-tools should detect and work with python3

[williamcroberts]

Sorry this won't happen for 4.0, but we can look into it for 4.0.x or a 4.1.x release. But this is something we need to do, as you mention python2 is going away.

[diabonas]

The scripts themselves are compatible with Python 3 already, I think this would be only a matter of changing all invocations of python to python3, since that should work on all recent major distributions. Probably this can wait until after Python 2 is EOL, since I believe most distributions still have /usr/bin/python, and we don't care whether it is a symlink to python2 or python3.

[williamcroberts]

@diabonas I was just testing this and found the same thing. We already have python3 support. We should probably do one of the follwing:

• ci test for python2 and python3
• change python to python3 <-- I support this

Any arguments to keep python 2.x support around since its EOL?

[williamcroberts]

@diabonas I was just testing this and found the same thing. We already have python3 support. We should probably do one of the follwing:

• ci test for python2 and python3
• change python to python3 <-- I support this

Any arguments to keep python 2.x support around since its EOL?

I guess ubuntu18.04 has it be default so we could keep testing it if we switch to multiple distros to test against we'll pick up python3 in fedora 30.

[williamcroberts]

This is all being tested now and works with python3 and python2. The CI scripts are building on multiple distros each using a different flavor of python, see:

• d08a4b2
• 55f9be3
• 44ec17b