diff --git a/Jenkinsfile b/Jenkinsfile
index e8bf12d..a846962 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -31,11 +31,7 @@ def wrap = { fn->
                 variable: 'GOOGLE_APPLICATION_CREDENTIALS_OVERRIDE')]) {
                 withCredentials([string(credentialsId: 'newrelic.license.key',
                     variable: 'NEWRELIC_LICENSE_KEY_OVERRIDE')]) {
-                    sh ("""
-                        cp env.sh.sample env.sh
-                        rm -rf build
-                        mkdir build
-                    """)
+                    sh ("bin/clean-workspace.sh")
                     fn()
                 }
             }
diff --git a/bin/clean-workspace.sh b/bin/clean-workspace.sh
new file mode 100755
index 0000000..a227196
--- /dev/null
+++ b/bin/clean-workspace.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# clean workspace
+#
+# Set bash unofficial strict mode http://redsymbol.net/articles/unofficial-bash-strict-mode/
+set -euo pipefail
+
+# Set DEBUG to true for enhanced debugging: run prefixed with "DEBUG=true"
+${DEBUG:-false} && set -vx
+# Credit to https://stackoverflow.com/a/17805088
+# and http://wiki.bash-hackers.org/scripting/debuggingtips
+export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
+
+# Credit to http://stackoverflow.com/a/246128/424301
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+BASE_DIR="$DIR/.."
+BUILD_DIR="$BASE_DIR/build"
+export BASE_DIR
+
+# shellcheck disable=SC1090
+. "$DIR/common.sh"
+
+cp "$BASE_DIR/env.sh.sample" "$BASE_DIR/env.sh"
+clean_root_owned_docker_files
+rm -rf "$BUILD_DIR"
+mkdir "$BUILD_DIR"
diff --git a/bin/codedeploy/AfterInstall.sh b/bin/codedeploy/AfterInstall.sh
index 93d1db5..2fcbca4 100755
--- a/bin/codedeploy/AfterInstall.sh
+++ b/bin/codedeploy/AfterInstall.sh
@@ -16,7 +16,7 @@ export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
 
 # Credit to http://stackoverflow.com/a/246128/424301
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-BASE_DIR="$DIR/.."
+BASE_DIR="$DIR/../.."
 ANSIBLE_DIR="$BASE_DIR/ansible"
 
 # Invoke Ansible for final set up
diff --git a/bin/codedeploy/ApplicationStart.sh b/bin/codedeploy/ApplicationStart.sh
index 5d08139..c2698ca 100755
--- a/bin/codedeploy/ApplicationStart.sh
+++ b/bin/codedeploy/ApplicationStart.sh
@@ -16,7 +16,7 @@ export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
 
 # Credit to http://stackoverflow.com/a/246128/424301
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-BASE_DIR="$DIR/.."
+BASE_DIR="$DIR/../.."
 ANSIBLE_DIR="$BASE_DIR/ansible"
 
 # Invoke Ansible for final set up