Merge branch 'fix/ci-upstream-branch' into 'master'

[ci] check out source branch in upstream mrs

See merge request !162

.gitlab-ci/default.yml

@@ -24,20 +24,19 @@ select tests:
   stage: configure
   before_script:
     - |
-      if [ ! -d "$DUMUX_FOLDER" ]; then
-          git clone -b master --depth 1 $DUMUX_REPO $DUMUX_FOLDER
-      fi
-
       if [[ -n "$DUMUX_MR_SOURCE_BRANCH" ]]; then
           echo "Fetching upstream branches related to merge request."
           echo "Source branch: $DUMUX_MR_SOURCE_BRANCH"
           echo "Target branch: $DUMUX_MR_TARGET_BRANCH"
 
+          git clone -b ${DUMUX_MR_SOURCE_BRANCH} --depth 1 $DUMUX_REPO $DUMUX_FOLDER
           pushd $DUMUX_FOLDER
               git fetch --depth=1 origin ${DUMUX_MR_TARGET_BRANCH}:${DUMUX_MR_TARGET_BRANCH}
           popd
 
       else
+          git clone -b master --depth 1 $DUMUX_REPO $DUMUX_FOLDER
+
           pushd $DUMUX_FOLDER
               if [[ -n "$DUMUX_TRIGGER_COMMIT_SHA" ]]; then
                   echo "Fetching upstream commit $DUMUX_TRIGGER_COMMIT_SHA"