#!/bin/bash

# EXAMPLES
usage() {
  echo "usage: " \
  "NAME=app " \
  "CONFIGREPLACEASK=setting.conf params.conf " \
  "[MOREGROUPS=dialout " \
  "USERNAMEGROUP=appuser " \
  "LOGFILE=/var/log/app.log " \
  "DATADIR=/var/lib/data]"
  "sh pre-post-build.sh"
  exit 1
}

echo "DEB Builder pre-post-file: https://git.blubbfish.net/vs_utils/CI-Scripts/src/branch/master/deb/pre-post-build.sh"

if [ -z "${NAME}" ]; then
  usage  
fi

if [ -z "${CONFIGREPLACEASK}" ]; then
  usage  
fi

if [ -z "${USERNAMEGROUP}" ]; then
  USERNAMEGROUP="${NAME}bot"
fi

###################################### POSTINST #################################
echo "#!/bin/bash"                                                                                                                                      > postinst
echo ""                                                                                                                                                >> postinst
echo "if [ \"\$1\" = \"configure\" ]; then"                                                                                                            >> postinst

# Create User and Group(s) if not exist
echo "  if [ -z \"\`id -u ${USERNAMEGROUP}  2> /dev/null\`\" ]; then"                                                                                  >> postinst
echo "    adduser --system --group --home /nonexistent --gecos \"${NAME} User\" --no-create-home --disabled-password --quiet ${USERNAMEGROUP} || true" >> postinst
if [ -n "${MOREGROUPS}" ]; then
  echo "    usermod -G ${USERNAMEGROUP},adm,${MOREGROUPS} ${USERNAMEGROUP}"                                                                            >> postinst
else
  echo "    usermod -G ${USERNAMEGROUP},adm ${USERNAMEGROUP}"                                                                                          >> postinst
fi
echo "  fi"                                                                                                                                            >> postinst

# Config replacement via ucf
echo ""                                                                                                                                                >> postinst
for conffile in ${CONFIGREPLACEASK} ; do
  echo "  ucf --three-way /usr/share/${NAME}/etc/${conffile} /etc/${NAME}/${conffile}"                                                                 >> postinst
done
echo ""                                                                                                                                                >> postinst

# Create Logfile
if [ -n "${LOGFILE}" ]; then
  echo "  ucf --three-way /usr/share/${NAME}/logrotate.d/${NAME}.conf /etc/logrotate.d/${NAME}.conf"                                                   >> postinst
  echo "  mkdir -p $(dirname ${LOGFILE})"                                                                                                              >> postinst
  echo "  touch ${LOGFILE}"                                                                                                                            >> postinst
  echo "  chown ${USERNAMEGROUP}:${USERNAMEGROUP} ${LOGFILE}"                                                                                          >> postinst
  echo "  chmod 644 ${LOGFILE}"                                                                                                                        >> postinst
  echo ""                                                                                                                                              >> postinst
fi

# Set userright to binary folder
echo "  chown -R ${USERNAMEGROUP}:${USERNAMEGROUP} /usr/local/bin/${NAME}"                                                                             >> postinst
echo ""                                                                                                                                                >> postinst

# Set usserrights to config folder
echo "  if [ -d "/etc/${NAME}/" ]; then"                                                                                                               >> postinst
echo "    chown -R ${USERNAMEGROUP}:${USERNAMEGROUP} /etc/${NAME}/"                                                                                    >> postinst
echo "  fi"                                                                                                                                            >> postinst
echo ""                                                                                                                                                >> postinst

# Create datadir
if [ -n "${DATADIR}" ]; then
  echo "  mkdir -p ${DATADIR}"                                                                                                                         >> postinst
  echo "  chown -R ${USERNAMEGROUP}:${USERNAMEGROUP} ${DATADIR}"                                                                                       >> postinst
  echo ""                                                                                                                                              >> postinst
fi

echo "fi"                                                                                                                                              >> postinst
echo ""                                                                                                                                                >> postinst

# Enable service
echo "systemctl enable ${NAME}"                                                                                                                        >> postinst
echo "systemctl daemon-reload"                                                                                                                         >> postinst
echo ""                                                                                                                                                >> postinst

# Start Service if it was running
echo "if [ -f /tmp/${NAME}_service_runner ]; then"                                                                                                     >> postinst
echo "    service ${NAME} start"                                                                                                                       >> postinst
echo "    rm /tmp/${NAME}_service_runner"                                                                                                              >> postinst
echo "fi"                                                                                                                                              >> postinst

################### PRERM ###################
echo "#!/bin/bash"                                                                                                                                      > prerm
echo ""                                                                                                                                                >> prerm
echo "if [[ \$(systemctl is-active ${NAME} || true) == \"active\" ]]"                                                                                  >> prerm
echo "then"                                                                                                                                            >> prerm
echo "    touch /tmp/${NAME}_service_runner"                                                                                                           >> prerm
echo "    service ${NAME} stop"                                                                                                                        >> prerm
echo "fi"                                                                                                                                              >> prerm