CIBW_ENVIRONMENT broken in 1.5.3

[YannickJadoul]

Somehow, my line of export CIBW_ENVIRONMENT='... CCACHE_BASEDIR=python -c "import tempfile; import os; print(os.path.realpath(tempfile.gettempdir()))" ...' (see https://github.com/YannickJadoul/Parselmouth/blob/1f3dd9abc63afdf4a1d26db40d210bb4187118a8/.travis.yml#L143; yes, I know I ought to clean this up) breaks:

    + /bin/true
    + mkdir -p /project
    + /opt/python/cp38-cp38/bin/python -c 'import sys, json, os; json.dump(os.environ.copy(), sys.stdout)'
    + uname -i
x86_64
    + python -c import 'tempfile;' import 'os;' 'print(os.path.realpath(tempfile.gettempdir()))'
  File "<string>", line 1
    import

See https://travis-ci.org/github/YannickJadoul/Parselmouth/jobs/709679114#L392

I'll start investigating, but is this perhaps related to #403, @joerick?

[YannickJadoul]

OK, got it.

Simplified example:

from cibuildwheel import environment
print(environment.parse_environment('X=`python -c "import antigravity"`').as_dictionary({}))

What's going wrong is that node.word is not the same as node.word is not the same as context.input[part.pos[0]:part.pos[1]] (the latter includes the quotes, the first one doesn't), so cibuildwheel loses the quotes, ends up with python -c import antigravity, which gets split by shlex.split into 4 parts, rather than 3.

Let's see if I can make a PR.