Configured TFS Plugin to use update only

• Build Step 1: Execute Shell (Print out TFS_CHANGESET)
• Build Step 2: Execute Maven Build (Maven 3.1.1)
• Build Step 3: Execute Shell (rolling_label.sh ${WORKSPACE} ${BUILD_NUMBER} ${TFS_CHANGESET})

The execution build step Nr. 3 fails from time to time by the cause that the TFS_CHANGESET variable has not been set which can't be cause within the build step 1 it will be correctly printed out to the jenkins console.

The following is the output in case of a failure:

[portal-HEAD] $ /usr/bin/bash -xe /temp/hudson1539801749356572417.sh
+ /build/label.sh /opt/build/xxxxx-HEAD 4855

The following is the output in case of success:

[Current build status] check if current [SUCCESS] is worse or equals then [SUCCESS] and better or equals then [SUCCESS]
Run condition [Current build status] enabling perform for step [Execute shell]
[xxxxx-HEAD] $ /usr/bin/bash -xe /temp/hudson7426258207171993715.sh
 + /build/label.sh /opt/build/xxxxx-HEAD 4856 173224
 Updated label xxxxxx_HEAD@$/CCB
 [WARNINGS] Parsing warnings in console log with parser Maven

which shows that only the TFS_CHANGESET is not being set.