+CONFIG_BACKUP=false
+
+CONFIG_VARS=`python - <<EOF
+from configparser import ConfigParser
+c = ConfigParser()
+c.read('library/setup.cfg')
+p = dict(c['pimoroni'])
+# Convert multi-line config entries into bash arrays
+for k in p.keys():
+    fmt = '"{}"'
+    if '\n' in p[k]:
+        p[k] = "'\n\t'".join(p[k].split('\n')[1:])
+        fmt = "('{}')"
+    p[k] = fmt.format(p[k])
+print("""
+LIBRARY_NAME="{name}"
+LIBRARY_VERSION="{version}"
+""".format(**c['metadata']))
+print("""
+PY3_DEPS={py3deps}
+PY2_DEPS={py2deps}
+SETUP_CMDS={commands}
+CONFIG_TXT={configtxt}
+""".format(**p))
+EOF`
+
+if [ $? -ne 0 ]; then
+       printf "Error parsing configuration...\n"
+       exit 1
+fi
+
+function do_config_backup {
+       if [ ! $CONFIG_BACKUP == true ]; then
+               CONFIG_BACKUP=true
+               FILENAME="config.preinstall-$LIBRARY_NAME-$DATESTAMP.txt"
+               printf "Backing up $CONFIG to $FILENAME\n"
+               cp $CONFIG $FILENAME
+       fi
+}
+
+function apt_pkg_install {
+       PACKAGES=()
+       PACKAGES_IN=("$@")
+       for ((i = 0; i < ${#PACKAGES_IN[@]}; i++)); do
+               PACKAGE="${PACKAGES_IN[$i]}"
+               printf "Checking for $PACKAGE\n"
+               dpkg -L $PACKAGE > /dev/null 2>&1
+               if [ "$?" == "1" ]; then
+                       PACKAGES+=("$PACKAGE")
+               fi
+       done
+       PACKAGES="${PACKAGES[@]}"
+       if ! [ "$PACKAGES" == "" ]; then
+               echo "Installing missing packages: $PACKAGES"
+               sudo apt update
+               sudo apt install -y $PACKAGES
+       fi
+}
+
+eval $CONFIG_VARS