Merge pull request #1 from tomato42/travis-fixes-2

Fix travis builds

.travis.yml

@@ -43,12 +43,21 @@ matrix:
       env: PYCRYPTO=true GMPY=true
 
 before_install:
+  - |
+       echo -e "TRAVIS_PULL_REQUEST=$TRAVIS_PULL_REQUEST\n" \
+               "TRAVIS_REPO_SLUG=$TRAVIS_REPO_SLUG\n" \
+               "TRAVIS_PULL_REQUEST=$TRAVIS_PULL_REQUEST\n" \
+               "TRAVIS_COMMIT=$TRAVIS_COMMIT\n" \
+               "TRAVIS_PYTHON_VERSION=$TRAVIS_PYTHON_VERSION"
   - |
        # workaround https://github.com/travis-ci/travis-ci/issues/2666
        if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
-         PR_FIRST=$(curl -s https://github.com/${TRAVIS_REPO_SLUG}/pull/${TRAVIS_PULL_REQUEST}.patch | head -1 | grep -o -E '\b[0-9a-f]{40}\b' | tr -d '\n')
+         URL="https://github.com/${TRAVIS_REPO_SLUG}/pull/${TRAVIS_PULL_REQUEST}.patch"
+         # `--location` makes curl follow redirects
+         PR_FIRST=$(curl --silent --show-error --location $URL | head -1 | grep -o -E '\b[0-9a-f]{40}\b' | tr -d '\n')
          TRAVIS_COMMIT_RANGE=$PR_FIRST^..$TRAVIS_COMMIT
        fi
+  - echo "TRAVIS_COMMIT_RANGE=$TRAVIS_COMMIT_RANGE"
   - git fetch origin master:refs/remotes/origin/master
 
 install: