diff --git a/git_helpers.sh b/git_helpers.sh
deleted file mode 100755
index 1343269..0000000
--- a/git_helpers.sh
+++ /dev/null
@@ -1,241 +0,0 @@
-#!/bin/bash
-# set -x 
-
-source ./log_helpers.sh
-
-GIT_SSL_NO_VERIFY=true
-
-#
-exec_git_command () {
-    local func="${FUNCNAME[0]}"
-    
-    log_debug "$func:${LINENO} exec-ing $1"
-
-    exec {fd}< <($1)
-    local ps_pid=$!             # remember pid of process substitution
-
-    local git_result=""
-    while read t <&$fd; do
-        if ! [ -z "$t" ]; then
-            git_result="${git_result}$t"
-        fi
-    done
-        
-    exec {fd}>&-                # close fd (i.e. process substitution)
-    wait $ps_pid                # wait for the subshell to finish
-
-    git_result=$(printf "$git_result" | tr '\n' ' ')
-    printf "%s\n" $git_result
-}
-
-# 
-latest_commit () {
-    local func="${FUNCNAME[0]}"
-    # git reflog -> 46c5896 HEAD@{0}: commit: Made update_helpers.sh executable
-    local c=$(git reflog | grep "HEAD@{0}" | cut -d" " -f1)
-    if ! [ -z "$c" ]; then
-        if grep -qE "^[[:xdigit:]]{6,}$" <<< $c; then
-            log_debug "$func: commit -> $c"
-            printf "%s\n" $c
-        else
-            log_crit "$func: wrong format for commit c=$c"
-            printf ""
-        fi
-    else 
-        log_crit "$func: 'git reflog' result empty"
-        printf ""
-    fi
-}
-
-# fallback if something went wrong: revert to last valid commit
-revert_to_commit_before_pull () {
-    local func="${FUNCNAME[0]}"
-    if ! [ -z "$commit_before_pull" ]; then
-        if grep -qE "^[[:xdigit:]]{6,}$" <<< $commit_before_pull; then
-            `git reset --hard "$commit_before_pull"`
-            if [ $? -eq 0 ]; then
-                log_info "$func: git reset --hard $commit_before_pull"
-                return 0
-            fi
-            log_crit "$func: 'git reset --hard $commit_before_pull' failed!"
-        fi
-        log_crit "$func: wrong format for commit_before_pull"
-    fi
-    log_crit "$func: empty commit_before_pull"
-    return 1
-}
-# revert_to_commit_before_pull
-
-# clone the customer repository in ./UpdateController/workspace.
-# this is done only once.
-clone_customer_repository () {
-    local func="${FUNCNAME[0]}"
-    current_dir=${PWD##*/}
-    current_dir="./${current_dir:-/}"
-    if [ "$current_dir" = "./UpdateController" ]; then
-        if ! [[ -d ./workspace ]]; then
-            { mkdir -p ./workspace; }
-        fi
-        # check if the directory is empty. If so, clone the
-        # customer repository
-        if ! find ./workspace -mindepth 1 -maxdepth 1 | read; then
-            log_debug "$func: cloning ${1} ..."
-            ( cd ./workspace && git clone "$1" ; )
-            if [ $? -eq 0 ]; then
-                log_debug "$func: cloning ${1} done"
-                return 0
-            fi
-        fi
-    fi
-    return 1
-}
-# clone_customer_repository ->
-# https://git.mimbach49.de/GerhardHoffmann/customer_281.git
-
-cd_customer_repository () {
-    # has to be called in ./UpdateController
-    local func="${FUNCNAME[0]}"
-    current_dir=${PWD##*/}
-    current_dir="./${current_dir:-/}"
-    if [ "$current_dir" = "./UpdateController" ]; then
-        repository_dir="./workspace/${customer_id}"
-        if ! [[ -d "$repository_dir" ]]; then
-            log_crit "$func:${LINENO}: $repository_dir does not exist!"
-            return 1
-        fi
-        
-        if ! cd $repository_dir; then
-            log_crit "$func:${LINENO}: cannot change to $repository_dir!"
-            return 1
-        fi
-
-        log_debug "$func:${LINENO}: cd to $repository_dir!"
-        return 0
-    fi
-    return 1
-}
-
-cd_home () {
-    if cd - &>/dev/null ; then
-        return 0
-    fi
-    return 1
-}
-
-pull_customer_repository () {
-    # has to be called in ./UpdateController
-    local func="${FUNCNAME[0]}"
-
-    if ! cd_customer_repository ; then
-        return 1
-    fi
-
-    local commit_before_pull=$(latest_commit)
-    if [ -z $commit_before_pull ]; then
-        cd_home ; return 1
-    fi
-
-    log_debug "$func:${LINENO}: commit_before_pull=$commit_before_pull"
-
-    exec {fd}< <(git pull)
-    local ps_pid=$!             # remember pid of process substitution
-
-    local git_result=""
-    while read t <&$fd; do
-        if ! [ -z "$t" ]; then
-            git_result="${git_result}$t"
-        fi
-    done
-        
-    exec {fd}>&-                # close fd (i.e. process substitution)
-    wait $ps_pid                # wait for the subshell to finish
-
-    if [ -z "$git_result" ]; then
-        log_warn "$func:${LINENO}: git result empty" ; cd_home;
-        return 1
-    fi
-
-    log_debug "$func:${LINENO} git-pull-result=${git_result}"
-
-    if [ "$git_result" = "Already up to date." ]; then
-        log_warn "$func:${LINENO}: $PWD already up to date."
-        cd_home ; return 1
-    fi
-
-    local commit_after_pull=$(latest_commit)
-    if [ -z $commit_after_pull ]; then
-        cd_home ; return 1
-    fi
-        
-    log_debug "$func:${LINENO}: commit_after_pull=$commit_after_pull"
-
-    # Note: # 'git pull' is a 'git fetch' followed by a 'git merge'.
-    # Here's the fetch portion:
-    #
-    # remote: Counting objects: 11, done.
-    # remote: Compressing objects: 100% (5/5), done.
-    # remote: Total 7 (delta 2), reused 0 (delta 0)
-    #
-    # At this point, you've told the remote what you want.
-    # It finds all the objects it needs to give you,
-    # compresses them for faster transfer over the network,
-    # and then reports what it's sending you.
-    # 
-    # Unpacking objects: 100% (7/7), done.
-    # 
-    # You receive the pack (set of compressed objects) and unpack it.
-    #
-    # From ssh://my.remote.host.com/~/git/myproject
-    # * branch            master     -> FETCH_HEAD
-
-    # You've fetched the branch 'master' from the given remote;
-    # the ref FETCH_HEAD now points to it.
-    # Now we move on to the merge - precisely, git will merge
-    # FETCH_HEAD (the remote's master branch) into your current branch
-    # (presumably master).
-    #
-    #######################################################################
-    # here starts "message"
-    # 
-    # Updating 9d447d2..f74fb21
-    # Fast forward
-    #
-    # It turns out that you haven't diverged from the remote's master branch,
-    # so the merge is a fast-forward (a trivial merge where it simply moves
-    # you forward in the history).
-    #
-    # Git notes the original position of your master branch (9d447d2)
-    # and the new position (f74fb21) it's been fast-forwarded to.
-    # If you had diverged from the remote's master branch,
-    # you'd see the output of a recursive merge here - Merge made
-    # by recursive, possibly along with some Auto-merged <file>
-    # and (oh no!) merge conflicts!
-    #
-    # szeged/1/1/etc/psa_config/device.conf | 13 +++++++------
-    # szeged/update.conf                    |  2 +-
-    # 2 files changed, 8 insertions(+), 7 deletions(-)
-    #  
-    # Finally, it shows you the diffstat between the original and post-merge
-    # position of your master branch;
-    # this is basically what you'd get from
-    #
-    # git diff --stat master@{1} master.
-    # 
-
-    update_commit="${commit_before_pull}..${commit_after_pull}"
-    if ! grep -qE ".*Updating\s+${update_commit}.*?" <<< $git_result; then
-        log_crit "$func:${LINENO}: no $update_commit in [ $git_result ]"
-        cd_home ; return 1
-    fi
-
-    return 0
-}
-# pull_customer_repository customer_281
-
-changed_files () {
-    local func="${FUNCNAME[0]}"
-    if  cd_customer_repository ; then
-        printf "%s\n" $(exec_git_command 'git diff --stat master@{1} master')
-        cd_home
-    fi
-}