preinst

#!/bin/bash -e
#
# This script is executed in the pre-installation phase
#
#   On Debian,
#       $1=install : indicates an new install
#       $1=upgrade : indicates an upgrade
#


# Sets the default values for Okapi variables
OKAPI_USER="okapi"
OKAPI_GROUP="okapi"
DATA_DIR="/var/lib/okapi"

# Source the default env file
OKAPI_ENV_FILE="/etc/default/okapi"
if [ -f "$OKAPI_ENV_FILE" ]; then
    . "$OKAPI_ENV_FILE"
fi

case "$1" in
    install|upgrade)

        # Create okapi group if not existing
        if ! getent group "$OKAPI_GROUP" > /dev/null 2>&1 ; then
            echo -n "Creating $OKAPI_GROUP group..."
            addgroup --quiet --system "$OKAPI_GROUP"
            echo " OK"
        fi

        # Create okapi user if not existing
        if ! id "$OKAPI_USER" > /dev/null 2>&1 ; then
            echo -n "Creating $OKAPI_USER user..."
            adduser --quiet \
                    --system \
                    --home "$DATA_DIR" \
                    --ingroup "$OKAPI_GROUP" \
                    --disabled-password \
                    --shell /bin/false \
                    "$OKAPI_USER"
            echo " OK"
        fi

        # Create DATA_DIR on reinstall because package removal removes DATA_DIR but not OKAPI_USER
        if [ ! -e "$DATA_DIR" ] ; then
            mkdir -m 750 "$DATA_DIR"
            chown "${OKAPI_USER}.${OKAPI_GROUP}" "$DATA_DIR"
        fi
    ;;
    abort-deconfigure|abort-upgrade|abort-remove)
    ;;

    *)
        echo "pre install script called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

exit 0