Replace python command with python3 to compile binaryen on Linux again.

[apoleon]

This is the fix for #1691

[kripken]

Thanks @apoleon!

It looks like there is no python3 in that docker image, which is causing that error.

@trzecieu I think that's your image - is the lack of python3 intentional there? If so maybe we need to install it in our CI here.

[trzecieu]

Hi @kripken, @apoleon it wasn't.
Hosted image is more like a base image that could be extended, but indeed as Emscripten has nice python3 support I will switch to it. Once it's done I will report it here.

[trzecieu]

Hi,
I've fixed my building scripts and added python3 to emscripten-slim images.

➜ docker run --rm -it trzeci/emscripten-slim python3 --version
Unable to find image 'trzeci/emscripten-slim:latest' locally
latest: Pulling from trzeci/emscripten-slim
9fc222b64b0a: Pull complete 
c83a77646c07: Pull complete 
5a0d43034d7b: Pull complete 
7c1ece14290e: Pull complete 
7b4816a5faa6: Pull complete 
7fc9b6a1940b: Pull complete 
53d18c007e95: Pull complete 
9d4e29476964: Pull complete 
c1ca614584e0: Pull complete 
Digest: sha256:98caf2d2e3cf644bc03e98a3ceefcd325c0a9806ceb78eb88711fe7d417dc945
Status: Downloaded newer image for trzeci/emscripten-slim:latest
Python 3.5.3

So that Emscripten Slim 1.38.34+ is shipped with python3 and python2. Still managed to have a total size of 170MB which is still sweet.
Sorry for inconvenience.

[sbc100]

So maybe if I retry the travis job it will pass now?

[trzecieu]

It will fail as I didn't set in place sdk-incoming-64bit tag and I was focused on the tagged releases.
Let me take a look this evening what I can do to recover incoming image (it's pointing at some old version).
Alternatively tag can be switched from incoming to latest which is set to the latest tagged release of emscripten and it's compiled against emscripten-releases repo

[trzecieu]

Should work now:

➜ docker run --rm -it trzeci/emscripten-slim:sdk-incoming-64bit python3 --version
Python 3.5.3
➜ docker run --rm -it trzeci/emscripten:sdk-incoming-64bit python3 --version 
Python 3.5.3

[trzecieu]

Can it be re-triggered and tested?

[sbc100]

Restarted test

[kripken]

Looks good, thanks!