travis: make conditional test coverage analysis work again

.travis.yml

@@ -73,6 +73,13 @@ matrix:
   - go: master
 
 before_install:
+ # Make sure we have the origin master to compare HEADs and
+ # save the sha for comparison in test-coverage.sh.
+ # It is necessary to do this here since the rigmarole for
+ # Windows loses the link to the real origin master.
+ - git fetch --depth=1 origin master
+ - export ORIGIN_MASTER=$(git ls-remote origin master | cut -f1)
+
  # This garbage is necessary because on windows, Travis 
  # helpfully sets core.autocrlf to true.
  #

.travis/script.d/test-coverage.sh

@@ -5,10 +5,11 @@ if [[ "${TRAVIS_SECURE_ENV_VARS}" != true ]]; then
 	exit 0
 fi
 
-ORIGIN_MASTER="$(git ls-remote origin master | cut -f1)"
 CURRENT="$(git rev-parse HEAD)"
 if [[ ${ORIGIN_MASTER} != ${CURRENT} ]]; then
 	echo "skipping coverage - not merged into master"
+	echo origin/master is ${ORIGIN_MASTER}
+	echo current HEAD is ${CURRENT}
 	exit 0
 fi