Update Travis script

TravisCI is cloning things in a weird way (possibly Jenkins too)
so let's adjust the CI script as well as the bash script itself
in order to compare against the remote master and not the
(possibly missing) local one.

Author: platisd

.travis.yml

@@ -14,9 +14,11 @@ cache:
 install:
   - pip3 install textblob
   - python3 -m textblob.download_corpora
+  - git config remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
+  - git fetch --all
 
 script:
   # Run the unit tests (you probably don't need to run this in your CI)
   - pytest bad_commit_message_blocker_tests.py
-  # Run the script passing the current commit message as argument
-  - python3 bad_commit_message_blocker.py --message "$TRAVIS_COMMIT_MESSAGE"
+  # Verify that all commit messages in current branch abide by the best practices
+  - bash multiple_commits.sh

multiple_commits.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eu
 
-commits_since_master=$(git rev-list HEAD ^master)
+commits_since_master=$(git rev-list HEAD ^origin/master)
 
 while read -r commit_hash; do
     commit_message="$(git log --format=%B -n 1 $commit_hash)"