diff --git a/cms/cms-patatrack-ci.yml b/cms/cms-patatrack-ci.yml
index ab394abe9287933378a2e3967e616557b2c41b26..b8cdc8e986b271c3d3d658171e7ebce09802cc00 100644
--- a/cms/cms-patatrack-ci.yml
+++ b/cms/cms-patatrack-ci.yml
@@ -128,7 +128,7 @@ job_snapshot_cvmfs:
     artifacts:
         paths:
             - ${CI_PROJECT_DIR}/traces
-            - ${CI_PROJECT_DIR}/cvmfs_export_dir_content
+            - ${CI_PROJECT_DIR}/cvmfs_export_dir_content.txt
             - ${CI_PROJECT_DIR}/cvmfs_export_py2-scipy_content
             - ${CI_PROJECT_DIR}/cms/patatrack/cvmfs
         expire_in: 1 week
diff --git a/cms/patatrack/ci-scripts/snapshot_cvmfs.sh b/cms/patatrack/ci-scripts/snapshot_cvmfs.sh
index 4cf653363c44ddf57f4284270f001e2b6a97cb42..21cc3830e19b91d8b469e293be7c8139e19acd88 100644
--- a/cms/patatrack/ci-scripts/snapshot_cvmfs.sh
+++ b/cms/patatrack/ci-scripts/snapshot_cvmfs.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # script used in gitlab CI
-# for job job_snapshot_cvmfs
+# for job snapshot_cvmfs
 # in file cms/cms-patatrack-ci.yml
 
 function _before_script() {
@@ -18,21 +18,30 @@ function _script() {
     docker pull gitlab-registry.cern.ch/hep-benchmarks/hep-workloads-gpu/cms/cms-patatrack-nvidia-2:qa
     docker run --name patatrack_container --gpus '"device=0"' -v ${CIENV_CVMFSVOLUME}:/cvmfs gitlab-registry.cern.ch/hep-benchmarks/hep-workloads-gpu/cms/cms-patatrack-nvidia-2:qa -e 100 -t 8 -c 1
     # run shrinkwrapper
-    docker exec cvmfs_${CI_JOB_ID} /root/shrinkwrap.sh -t /tmp/traces/ -e ${CVMFS_EXPORT_DIR}
+    docker exec cvmfs_${CI_JOB_ID} /root/shrinkwrap.sh -t /tmp/traces -e ${CVMFS_EXPORT_DIR}
+    # get the generated traces from the container
+    docker cp cvmfs_${CI_JOB_ID}:/tmp/traces ${CI_PROJECT_DIR}/traces
+    # TODO: check if fixed in CI via traces/cms.cern.ch_spec_custom.txt
     # FIXME this is a dirty patch needed to make scipy running. cvmfs shrinkwrapper alone does not copy all files of that dir. To be investigated why
     ls -lR ${CVMFS_EXPORT_DIR}/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/py2-scipy/1.2.3-bcolbf/lib/python2.7 >${CI_PROJECT_DIR}/cvmfs_export_py2-scipy_content
     rm -fr ${CVMFS_EXPORT_DIR}/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/py2-scipy/1.2.3-bcolbf/lib/python2.7/site-packages
     docker cp patatrack_container:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/py2-scipy/1.2.3-bcolbf/lib/python2.7/site-packages ${CVMFS_EXPORT_DIR}/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/py2-scipy/1.2.3-bcolbf/lib/python2.7
-    # remove duplicated data
+    # TODO: include sha5checksum of exported CVMFS?
+    # tar -cf /tmp/cvmfs_checksum.tar ${CVMFS_EXPORT_DIR}/cvmfs && md5sum /tmp/cvmfs_checksum.tar | cut -f1 -d" " > /tmp/cvmfs_checksum.txt && rm /tmp/cvmfs_checksum.tar
+    # mv /tmp/cvmfs_checksum.txt ${CVMFS_EXPORT_DIR}/cms/patatrack/cvmfs
+    # remove duplicated data & empty dirs
+    # find ${CVMFS_EXPORT_DIR} -type d -empty -delete
     rm -rf ${CVMFS_EXPORT_DIR}/cvmfs/.data
-    ls -R ${CVMFS_EXPORT_DIR} >${CI_PROJECT_DIR}/cvmfs_export_dir_content
+    ls -R ${CVMFS_EXPORT_DIR} >${CI_PROJECT_DIR}/cvmfs_export_dir_content.txt
 }
 
 function _after_script() {
+    #sigkill and remove containers, images remain.
     docker rm -f cvmfs_${CI_JOB_ID}
     docker rm -f patatrack_container
 }
 
+# TODO: clean up $CIENV_CVMFSVOLUME, clean up docker image cache
 export CIENV_CVMFSVOLUME=/scratch/cvmfs_hep/CI-JOB-${CI_JOB_ID}
 export CVMFS_EXPORT_DIR=${CI_PROJECT_DIR}/cms/patatrack
 export CIENV_CVMFSREPO=cms.cern.ch
diff --git a/cms/patatrack/cms-patatrack/bmk-driver.sh b/cms/patatrack/cms-patatrack/bmk-driver.sh
index e711aeb142892d04b9b1ca8fbe0b435da3285610..6c1215b07530ff6d6c6535e5e6ec04ecd7f14301 100644
--- a/cms/patatrack/cms-patatrack/bmk-driver.sh
+++ b/cms/patatrack/cms-patatrack/bmk-driver.sh
@@ -324,7 +324,6 @@ function doOneWrapper(){
     #   local status=${PIPESTATUS[0]} # NB do not use $? if you pipe to tee!
     #   chown -R root:root $workDir 2>&1 | tee -a $log
     # else
-      myecho "[doOneWrapper ($1)] not inside docker - run doOne as $(whoami)\n" 2>&1 | tee -a $log
       doOne $1 2>&1 | tee -a $log
       local status=${PIPESTATUS[0]} # NB do not use $? if you pipe to tee!
     # fi
diff --git a/cms/patatrack/cms-patatrack/cms-patatrack-bmk.sh b/cms/patatrack/cms-patatrack/cms-patatrack-bmk.sh
index eed2c5c4b55b633c34d7d09d5bbae2977b246279..71d2706da0ea44d5e62f2d6fe9dfbc141afae940 100755
--- a/cms/patatrack/cms-patatrack/cms-patatrack-bmk.sh
+++ b/cms/patatrack/cms-patatrack/cms-patatrack-bmk.sh
@@ -52,21 +52,21 @@ function validateInputArguments(){
 
   export CMSSW_RELEASE=CMSSW_11_1_0_pre8_Patatrack
   export VO_CMS_SW_DIR=/cvmfs/cms.cern.ch
-  export LC_ALL=en_US.UTF-8
 
+  # TODO: These functions are *bad* in anything non-privileged! we can only r/w in mounted DIRs!
+  cd ${resultsDir}
   source $VO_CMS_SW_DIR/cmsset_default.sh
   [[ ! -e ${CMSSW_RELEASE} ]] && scram project CMSSW ${CMSSW_RELEASE}
   cd ${CMSSW_RELEASE}/src; 
+  # sets all paths to point to CMVFS; ignores system binaries
   eval `scramv1 runtime -sh`;
   cd -
 
   env | grep LD_LIBRARY_PATH
   env | grep SRT_LD_LIBRARY_PATH_SCRAMRT
 
-  # FIXME: so far, after having snapshotted cvmfs the LD_LIBRARY_PATH
-  # FIXME: does not contain all path needed as when cvmfs is bind mounted
-  # FIXME: therefore I'm forcing it to be as the correct one
-  export LD_LIBRARY_PATH=/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/llvm/9.0.1-pfdnen/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib:/usr/local/nvidia/lib:/usr/local/nvidia/lib64
+  # TODO: This error comes from making CVMFS 555 - paths are set via <pkg>/<version>/etc/init.d/*
+  export LD_LIBRARY_PATH=/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/llvm/9.0.1-pfdnen/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib:/usr/local/nvidia/lib:/usr/local/nvidia/lib64:/.singularity.d/libs
   
   export SRT_LD_LIBRARY_PATH_SCRAMRT=/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/bmk/cms-patatrack/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/biglib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/lib/slc7_amd64_gcc820:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/cms/cmssw/CMSSW_11_1_0_pre8_Patatrack/external/slc7_amd64_gcc820/lib:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/llvm/9.0.1-pfdnen/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib64:/cvmfs/cms.cern.ch/slc7_amd64_gcc820/external/gcc/8.2.0-bcolbf/lib
 
@@ -91,9 +91,12 @@ fi
 
 export LC_ALL=en_US.UTF-8
 
-# Source the common benchmark driver
+# Execute common benchmark driver
 if [ -f $(dirname $0)/bmk-driver.sh ]; then
   . $(dirname $0)/bmk-driver.sh
-else
+elif [ -f $(dirname $0)/../../../common/bmk-driver.sh ]; then
   . $(dirname $0)/../../../common/bmk-driver.sh
+else
+  echo "Something went wrong with the default work dir. Could not find bmk-driver.sh";
+  exit 1;
 fi
diff --git a/cms/patatrack/traces/cms.cern.ch_spec_custom.txt b/cms/patatrack/traces/cms.cern.ch_spec_custom.txt
index e1badbcfe7e2791c18c36773c0a3321a621e3366..d7a8f40bfc064a167fcfd2c52bb70eab89178e83 100644
--- a/cms/patatrack/traces/cms.cern.ch_spec_custom.txt
+++ b/cms/patatrack/traces/cms.cern.ch_spec_custom.txt
@@ -1,3 +1,3 @@
-/slc7_amd64_gcc820/external/py2-future/*
-/slc7_amd64_gcc820/external/py2-numpy/*
-/slc7_amd64_gcc820/external/py2-scipy/*
\ No newline at end of file
+/slc7_amd64_gcc820/external/py2-future/0.18.2-bcolbf/*
+/slc7_amd64_gcc820/external/py2-numpy/1.16.6-bcolbf/*
+/slc7_amd64_gcc820/external/py2-scipy/1.2.3-bcolbf/*