Merge pull request #24057 from DanNixon/buildserver_x11_xvfb

Use Xvfb on Linux build servers

buildconfig/Jenkins/buildscript

@@ -15,11 +15,17 @@ SCRIPT_DIR=$(dirname "$0")
 # System discovery
 ###############################################################################
 USE_CORE_DUMPS=true
+X11_RUNNER="eval"
+X11_RUNNER_ARGS=""
 if [[ ${NODE_LABELS} == *rhel7* ]] || [[ ${NODE_LABELS} == *centos7* ]] || [[ ${NODE_LABELS} == *scilin7* ]]; then
   ON_RHEL7=true
+  X11_RUNNER="xvfb-run"
+  X11_RUNNER_ARGS=--server-args="-screen 0 640x480x24"
 fi
 if [[ ${NODE_LABELS} == *ubuntu* ]]; then
   ON_UBUNTU=true
+  X11_RUNNER="xvfb-run"
+  X11_RUNNER_ARGS=--server-args="-screen 0 640x480x24"
 fi
 if [[ ${NODE_LABELS} == *osx* ]]; then
   ON_MACOS=true
@@ -347,7 +353,7 @@ userprops_file=$userconfig_dir/Mantid.user.properties
 echo MultiThreaded.MaxCores=2 > $userprops_file
 
 if [[ ${DO_UNITTESTS} == true ]]; then
-  $CTEST_EXE -j${BUILD_THREADS:?} --schedule-random --output-on-failure
+  ${X11_RUNNER} "${X11_RUNNER_ARGS}" $CTEST_EXE -j${BUILD_THREADS:?} --schedule-random --output-on-failure
 fi
 
 ###############################################################################
@@ -362,8 +368,8 @@ if [[ ${DO_DOCTESTS_USER} == true ]]; then
     rm -fr $BUILD_DIR/docs/doctrees/*
   fi
   # Build HTML to verify that no referencing errors have crept in.
-  ${CMAKE_EXE} --build . --target docs-html
-  ${CMAKE_EXE} --build . --target docs-test
+  ${X11_RUNNER} "${X11_RUNNER_ARGS}" ${CMAKE_EXE} --build . --target docs-html
+  ${X11_RUNNER} "${X11_RUNNER_ARGS}" ${CMAKE_EXE} --build . --target docs-test
 fi
 
 ###############################################################################

dev-docs/source/JenkinsConfiguration.rst

@@ -101,14 +101,9 @@ Service" has completed you should
 Linux
 -----
 
-Install an ssh server.
+Install an ssh server, ``ccache``, ``curl`` and ``xvfb``.
 
-Install ``ccache``. After installing run ``ccache --max-size=20G`` from the ``builder`` account.
-
-Install a vnc server and from the ``builder`` account run ``vncpasswd`` to set a password on the VNC server. It
-can be any password.
-
-Ensure ``curl`` is installed
+From the ``builder`` account run ``ccache --max-size=20G``.
 
 Any machines acting as performance test servers will require ``mysqldb`` to be installed.