monotone-server 1.0-3 / postrm

#! /bin/sh
# vim: set ft=sh sw=4 et:
# postrm script for #PACKAGE#
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postrm> `remove'
#        * <postrm> `purge'
#        * <old-postrm> `upgrade' <new-version>
#        * <new-postrm> `failed-upgrade' <old-version>
#        * <new-postrm> `abort-install'
#        * <new-postrm> `abort-install' <old-version>
#        * <new-postrm> `abort-upgrade' <old-version>
#        * <disappearer's-postrm> `disappear' <r>overwrit>r> <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

MTN_HOME="/var/lib/monotone"
MTN_CONF_DIR="/etc/monotone"
MTN_HOOKS_DIR="${MTN_CONF_DIR}/hooks.d"
MTN_KEY_DIR="${MTN_HOME}/keys"
MTN_LOG_DIR="/var/log/monotone"
MTN_RUN_DIR="/var/run/monotone"
MAINLOG="${MTN_LOG_DIR}/mtn.log"
ERRORLOG="${MTN_LOG_DIR}/error.log"

locate_key()
{
  # This function attempts to locate the auto-generated keypair for the monotone-server.
  # It may list multiple filenames, or none at all.
  # Filenames are printed to standard out.
  db_get monotone-server/key

  if [ -d ${MTN_KEY_DIR} ]; then
    find ${MTN_KEY_DIR} -type f -regextype posix-egrep -regex "${MTN_KEY_DIR}/${RET}(\.[0-9a-f]{40})?"
  fi
}

delete_key()
{
  local KEY
  local KEY_COUNT

  KEY=`locate_key`
  KEY_COUNT=`echo ${KEY} | wc -w`

  if [ ${KEY_COUNT} -gt 1 ]; then
    echo "Unable to determine auto-generated monotone-server keypair." >&2
    echo "Please delete it manually from ${MTN_KEY_DIR}." >&2
  elif [ ${KEY_COUNT} -eq 1 ]; then
    rm -f "${KEY}"
  fi
}

case "$1" in
    purge)
       # note: when executing in this mode, this script cannot assume
       # the existence of _any_ of the package dependencies.  it must
       # work using only Essential packages.  hence, in several cases
       # below we do cleanups only if the relevant program exists.

       # remove config files from ucf database and filesystem
       for conf in write-permissions read-permissions serverrc; do

          # mimic dpkg and remove backups too
          for ext in '' '~' '%' .bak .ucf-new .ucf-old .ucf-dist; do
             rm -f /etc/monotone/$conf$ext || true
          done 

          # clear entries in ucf database
          # note: we cannot assume ucf is still installed at this point
          # (if it isn't, we don't need to worry about its database)
          if which ucf > /dev/null; then
             ucf --purge /etc/monotone/$conf
          fi
          if which ucfr > /dev/null; then
             ucfr --purge monotone-server /etc/monotone/$conf
          fi
       done

       # if debconf still exists and we were asked to auto-manage the
       # database, delete the auto-generated key and database. don't
       # delete anything else in /var/lib/monotone - there might be
       # hand-created databases and keys that the admin wants to keep.
       # in any case remove /var/lib/monotone(/keys) if empty.

       if [ -e /usr/share/debconf/confmodule ]; then
	   . /usr/share/debconf/confmodule

	   db_get monotone-server/manage-db
	   if [ "$RET" = true ]; then
	       delete_key
               rm -f ${MTN_HOME}/default.mtn
               rm -f ${MTN_HOME}/default.mtn~
               rm -f ${MTN_HOME}/default.mtn-journal

               if [ -f /etc/monotone/passphrases ]; then
                 db_get monotone-server/key
	         grep -v "$RET" /etc/monotone/passphrases \
	                      > /etc/monotone/passphrases.dpkg-new || true
	         if [ -s /etc/monotone/passphrases.dpkg-new ]; then
	  	     mv -f /etc/monotone/passphrases.dpkg-new \
		           /etc/monotone/passphrases
	         else
		     rm -f /etc/monotone/passphrases.dpkg-new \
		           /etc/monotone/passphrases
	         fi
	       fi
	   fi
	   # do not stop debconf, the debhelper additions will need it.
       fi

       if [ -d ${MTN_KEY_DIR} ]; then
         rmdir --ignore-fail-on-non-empty ${MTN_KEY_DIR}
       fi

       if [ -d ${MTN_HOME} ]; then
         rmdir --ignore-fail-on-non-empty ${MTN_HOME}
       fi

       if [ -d ${MTN_RUN_DIR} ]; then
         rmdir --ignore-fail-on-non-empty ${MTN_RUN_DIR}
       fi

       # We only delete get_passphrase_from_file.lua if it is a symlink
       # (as that is what the postinst script creates).
       GET_PASSPHRASE_HOOK="${MTN_HOOKS_DIR}/get_passphrase_from_file.lua"
       if [ -L ${GET_PASSPHRASE_HOOK} ]; then
         rm ${GET_PASSPHRASE_HOOK}
       fi

       if [ -d ${MTN_HOOKS_DIR} ]; then
         rmdir --ignore-fail-on-non-empty ${MTN_HOOKS_DIR}
       fi

       if [ -d ${MTN_CONF_DIR} ]; then
         rmdir --ignore-fail-on-non-empty ${MTN_CONF_DIR}
       fi

       # delete log files if they exist
       if [ -d ${MTN_LOG_DIR} ]; then
         rm -f ${MAINLOG}
         rm -f ${ERRORLOG}
         rmdir --ignore-fail-on-non-empty ${MTN_LOG_DIR}
       fi

       # Create a list of paths that still exist and may contain files owned by the monotone
       # user or group.
       MTN_USED_PATHS=""
       for MTN_USED_PATH in "${MTN_HOME}" "${MTN_CONF_DIR}" "${MTN_LOG_DIR}" "${MTN_RUN_DIR}"; do
         if [ -d "${MTN_USED_PATH}" ]; then
           MTN_USED_PATHS="${MTN_USED_PATHS:+${MTN_USED_PATHS}, }${MTN_USED_PATH}"
         fi
       done

       # if deluser/delgroup exist, remove the server user and group.
       # do not do this if /var/lib/monotone or /var/run/monotone still
       # exists (so that it will still have a named user owning it).
       if which deluser > /dev/null && [ -z "${MTN_USED_PATHS}" ]; then
	   if [ -n "`id -u monotone 2>/dev/null`" ]; then
               deluser --quiet monotone 2>/dev/null >/dev/null
	   fi

	   if [ -n "`id -g monotone 2>/dev/null`" ]; then
               delgroup --quiet monotone 2>/dev/null >/dev/null
	   fi
       else
	   if [ -n "${MTN_USED_PATHS}" ]; then
	       reason="the following paths still exist: ${MTN_USED_PATHS}"
	   else
	       reason="deluser is not available"
	   fi
	   echo "warning: not deleting monotone user or group because $reason." >&2
       fi

    ;;
    remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
    ;;

    *)
        echo "postrm called with unknown argument \`$1'" >&2
        exit 1

esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d monotone remove >/dev/null
fi
# End automatically added section
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section


exit 0