Merge pull request #2937 from kinow/set-location-of-coverage-file

Set location of coverage file in Travis

.travis.yml

@@ -47,7 +47,8 @@ env:
   - CYLC_TEST_RUN_PLATFORM=false
   # Custom diff command to ignore Xlib errors (xvfb has not RANDR extension).
   - CYLC_TEST_DIFF_CMD="diff -I Xlib -u"
-  - COVERAGE_PROCESS_START="${TRAVIS_BUILD_DIR}/.coveragerc"
+  # This coverage RC file is created under the script task
+  - COVERAGE_PROCESS_START="/tmp/.coveragerc"
   matrix:
   - CHUNK="1/4"
   - CHUNK="2/4"
@@ -58,6 +59,14 @@ env:
 install: .travis/install.sh functional-tests docs
 script:
 - export PYTHONPATH="${TRAVIS_BUILD_DIR}/.travis"
+# When we run cylc commands, there are processes being forked, that get a
+# new working directory. As .coveragerc contains relatives paths, it fails
+# to produce the correct coverage, unless we use absolute paths. The `sed`
+# call below tries to define the data_file, and sources locations for Travis.
+- sed -e "s|data_file=.coverage|data_file=${TRAVIS_BUILD_DIR}/.coverage|g; s|./bin|${TRAVIS_BUILD_DIR}/bin|g; s|./lib|${TRAVIS_BUILD_DIR}/lib|g" .coveragerc > /tmp/.coveragerc
+# And some tests fail if we touch files in the git working directory, due
+# to Cylc's version appearing with the "dirty" suffix. To avoid this, we
+# are using a new coveragerc created under the temporary directory.
 - coverage run .travis/cover.py
 - unset PYTHONPATH
 after_script: .travis/after_script.sh