Can't generate manifest file with steps as proposed

[DavidBruant]

STR:

git clone git@github.com:w3c/web-platform-tests.git
cd web-platform-tests
git submodule init
git submodule update --recursive
python tools/scripts/manifest.py MANIFEST.json

The manifest file isn't generated and the following is printed:

INFO:Web platform tests:Working directory not clean, adding local changes

git status reveals modified: tools/pywebsocket (untracked content) which contains a bunch of untracked src/mod_pywebsocket/*.pyc files.

Reverting changes allows to generate the manifest, but then python serve.py doesn't work. That's solve by doing git submodule update --recursive again.

Maybe the issue can be solved with adding the guilty files to .gitignore somewhere.

[jgraham]

This got rewritten.