Add CircleCI support (#91)

* Initial guess at supporting CircleCI

joerick/cibuildwheel#90

* Add note about setup_remote_docker on Circle

* Add diagnostic print of entire docker command

* Add more diagnostic prints

* Retrigger for Circle build

* Preliminary .circleci/config.yml

* Add workflows to Circle

* drop osx on circle

* call python3 directly on circle

* drop repeat pip install

* use a virtualenv on circle

* use a virtualenv on circle... again

* use a virtualenv on circle... again... again

* setup_remote_docker on circle

* try to manually copy into docker on circle

* correct Host

* correct docker calls

* refactor docker calls

* take 2 on the docker cp destination

* more docker cp debugging

* more docker cp debugging... again

* docker cp explicitly to /project

* wait until docker container is up

* wait until docker container is up... again

* and copy results back

* and copy results back... again

* create /output in container

* create /output in container... again

* copy contents of container's /output

* Retrigger ci

* fix merge typo

* fix monotonic

* always install monotonic

* always install monotonic... again

* correct to use project_dir

* wait a bit longer and a bit smarter

* wait a bit longer and a bit smarter... again

* add back circle osx

* add back circle osx... again

* py2/3 for circle

* py2/3 for circle... again

* use python2.7 image on circle linux

* (mostly) remove unused ci host identification code

* skip inspecting docker for the container, just retry copy on failure

* cleanup docker container and images

* fully remove ci host detection

* docs and tidy

* add circle badge

cibuildwheel/__main__.py

@@ -53,6 +53,8 @@ def main():
     if args.platform != 'auto':
         platform = args.platform
     else:
+        platform = None
+
         if os.environ.get('TRAVIS_OS_NAME') == 'linux':
             platform = 'linux'
         elif os.environ.get('TRAVIS_OS_NAME') == 'osx':
@@ -61,9 +63,15 @@ def main():
             platform = 'windows'
         elif 'BITRISE_BUILD_NUMBER' in os.environ:
             platform = 'macos'
-        else:
+        elif os.environ.get('CIRCLECI'):
+            if sys.platform.startswith('linux'):
+                platform = 'linux'
+            elif sys.platform.startswith('darwin'):
+                platform = 'macos'
+
+        if platform is None:
             print('cibuildwheel: Unable to detect platform. cibuildwheel should run on your CI server, '
-                  'Travis CI and Appveyor are supported. You can run on your development '
+                  'Travis CI, Appveyor, and CircleCI are supported. You can run on your development '
                   'machine using the --platform argument. Check --help output for more '
                   'information.',
                   file=sys.stderr)