Merge pull request matplotlib#4435 from matthew-brett/travis-wheels

TST: use travis wheels for dependencies

Author: tacaswell

.travis.yml

@@ -47,8 +47,21 @@ matrix:
   allow_failures:
     - python : "nightly"
 
+before_install:
+  - source tools/travis_tools.sh
+  # Install into our own pristine virtualenv
+  - virtualenv --python=python venv
+  - source venv/bin/activate
+
 install:
-  - pip install $PRE nose python-dateutil $NUMPY pep8 pyparsing pillow sphinx!=1.3.0
+  # Install only from travis wheelhouse
+  - if [ -z "$PRE" ]; then
+        wheelhouse_pip_install python-dateutil $NUMPY pyparsing pillow sphinx!=1.3.0;
+    else
+        pip install $PRE python-dateutil $NUMPY pyparsing pillow sphinx!=1.3.0;
+    fi
+  # Always install from pypi
+  - pip install $PRE nose pep8
 
   # We manually install humor sans using the package from Ubuntu 14.10. Unfortunatly humor sans is not
   # availible in the Ubuntu version used by Travis but we can manually install the deb from a later

tools/travis_tools.sh

@@ -0,0 +1,25 @@
+# Tools for working with travis-ci
+export WHEELHOUSE="http://travis-wheels.scikit-image.org/"
+
+retry () {
+    # https://gist.github.com/fungusakafungus/1026804
+    local retry_max=5
+    local count=$retry_max
+    while [ $count -gt 0 ]; do
+        "$@" && break
+        count=$(($count - 1))
+        sleep 1
+    done
+
+    [ $count -eq 0 ] && {
+        echo "Retry failed [$retry_max]: $@" >&2
+        return 1
+    }
+    return 0
+}
+
+
+wheelhouse_pip_install() {
+    # Install pip requirements via travis wheelhouse
+    retry pip install --timeout=60 --no-index --find-links $WHEELHOUSE $@
+}