File: monotone-server.postinst

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#! /bin/sh
# postinst script for monotone-server
#
# This script attempts to perform any db migrations neccessary during an
# upgrade.
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#

# source debconf stuff
. /usr/share/debconf/confmodule

MTN=/usr/bin/mtn

monotone_check_minimum_previous_version ()
{
    if dpkg --compare-versions "$MTN_VERSION" lt "0.17"; then
	# monotone version to old to automatically upgrade
	echo "Cannot automatically upgrade from monotone version $2." >&2
	echo "Please see UPGRADE and README.changesets in /usr/share/doc/monotone for" >&2
	echo "information on manually upgrading your database." >&2
	false
    else
	true
    fi
}

monotone_migrate ()
{
    if dpkg --compare-versions "$MTN_VERSION" lt "0.99-1"; then
	# upgradable version of monotone
	echo "Attempting to migrate monotone database.  This may take a while..." >&2
	echo "A backup named '`basename $MTN_DB~`' will be created in $MTN_HOME." >&2

	cp $MTN_DB $MTN_DB~

	if $MTN --db=$MTN_DB db migrate --rcfile=$MTN_CONFDIR/serverrc \
	    --no-standard-rcfiles --keydir=$MTN_KEYDIR --confdir=$MTN_CONFDIR \
	    >&2; then
	    echo "Database successfully migrated." >&2
	    true
	else
	    echo "*** Error migrating database. ***" >&2
	    echo "Please see UPGRADE and README.changesets in /usr/share/doc/monotone for" >&2
	    echo "information on manually upgrading your database." >&2
	    false
	fi
    else
	true
    fi
}

monotone_rosterify ()
{
    if dpkg --compare-versions "$MTN_VERSION" lt "0.26"; then
	# now we need to rosterify
	echo "Attempting to rosterify monotone database..." >&2

	if $MTN --db=$MTN_DB db rosterify --rcfile=$MTN_CONFDIR/serverrc \
	    --no-standard-rcfiles --keydir=$MTN_KEYDIR --confdir=$MTN_CONFDIR \
	    >&2; then
	    echo "Database successfully rosterified." >&2
	    true
	else
	    echo "*** Error rosterifying database. ***" >&2
	    echo "Please see UPGRADE and README.changesets in /usr/share/doc/monotone for" >&2
	    echo "information on manually upgrading your database." >&2
	    false
	fi
    else
	true
    fi
}

monotone_regenerate_caches ()
{
    if dpkg --compare-versions "$MTN_VERSION" lt "0.31-90.1"; then
	# now we need to regenerate caches
	echo "Attempting to regenerate caches..." >&2

	if $MTN --db=$MTN_DB db regenerate_caches --rcfile=$MTN_CONFDIR/serverrc \
	    --no-standard-rcfiles --keydir=$MTN_KEYDIR --confdir=$MTN_CONFDIR \
	    >&2; then
	    echo "Caches successfully regenerated." >&2
	    true
	else
	    echo "*** Error regenerating roster. ***" >&2
	    echo "Please see UPGRADE and README.changesets in /usr/share/doc/monotone for" >&2
	    echo "information on manually upgrading your database." >&2
	    false
	fi
    else
	true
    fi
}

case "$1" in
    configure)

        # directory turned into symlink; give dpkg a hand
	if [ ! -L /usr/share/doc/monotone-server ] && \
	   [ -e /usr/share/doc/monotone-server ]; then
            rmdir /usr/share/doc/monotone-server
	    ln -sf monotone /usr/share/doc/monotone-server
	fi

       MTN_HOME=/var/lib/monotone
       MTN_DB=$MTN_HOME/default.mtn
       MTN_CONFDIR=/etc/monotone
       MTN_KEYDIR=$MTN_HOME/keys

       ucf --debconf-ok /usr/share/monotone/write-permissions.base $MTN_CONFDIR/write-permissions
       ucf --debconf-ok /usr/share/monotone/read-permissions.base $MTN_CONFDIR/read-permissions
       if [ -f $MTN_CONFDIR/hooks.lua -a ! -f $MTN_CONFDIR/serverrc ]; then
	   ucf --debconf-ok /usr/share/monotone/serverrc.base $MTN_CONFDIR/hooks.lua
	   mv  $MTN_CONFDIR/hooks.lua $MTN_CONFDIR/serverrc
           # mimic dpkg and remove backups too
           for ext in '' '~' '%' .bak .ucf-new .ucf-old .ucf-dist; do
               rm -f $MTN_CONFDIR/hooks.lua$ext || true
           done
	   ucfr --purge monotone-server $MTN_CONFDIR/hooks.lua
       else
	   ucf --debconf-ok /usr/share/monotone/serverrc.base $MTN_CONFDIR/serverrc
       fi

       if [ ! -f $MTN_CONFDIR/hooks.d/get_passphrase_from_file.lua ]; then
	   ln -s /usr/share/monotone/hooks/get_passphrase_from_file.lua $MTN_CONFDIR/hooks.d/
       fi

       ucfr monotone-server $MTN_CONFDIR/write-permissions
       ucfr monotone-server $MTN_CONFDIR/read-permissions
       ucfr monotone-server $MTN_CONFDIR/serverrc

       # if this is our first install give config files correct permissions
       if [ -z "$2" ]; then
           # create monotone user and fix permissions of files
           if [ -z "`id -u monotone 2>/dev/null`" ]; then
	       adduser --system --group --home $MTN_HOME \
	       --no-create-home --disabled-password --quiet        \
	       --gecos "Monotone" monotone
           fi

           chown monotone:monotone $MTN_HOME
           chown monotone:monotone $MTN_CONFDIR
           chown monotone:monotone $MTN_KEYDIR
           chown monotone:monotone /var/log/monotone

           chmod 0750 $MTN_HOME
           chmod 0750 $MTN_CONFDIR
           chmod 0750 $MTN_KEYDIR

           chown monotone:monotone $MTN_CONFDIR/write-permissions
           chown monotone:monotone $MTN_CONFDIR/read-permissions
           chown monotone:monotone $MTN_CONFDIR/serverrc
           chmod 0640 $MTN_CONFDIR/write-permissions
           chmod 0640 $MTN_CONFDIR/read-permissions
           chmod 0640 $MTN_CONFDIR/serverrc
       fi

       db_get monotone-server/manage-db
       if [ "$RET" = "true" ]; then
           db_get monotone-server/key
           MTN_KEY=$RET

           # read our passphrase from a file
           if [ -e "$MTN_CONFDIR/passphrases" ]; then
               db_set monotone-server/passphrase "`grep "$MTN_KEY" $MTN_CONFDIR/passphrases | cut -f2 -d"\\""`"
           fi

           db_get monotone-server/passphrase
           MTN_KEY_PASSWD=$RET

           MTN_VERSION="$2"

           # Since we are configuring, we should check if we are upgrading.  If we are
           # upgrading, we should run the proper db migrate commands if necessary.

           if [ -z "$2" ]; then
              # not upgrading, fresh install

              # if there is no database, create one
              if [ ! -e $MTN_DB ]; then
                  echo "Creating Monotone database..." >&2
                  $MTN --db=$MTN_DB db init \
                     --no-standard-rcfiles --keydir=$MTN_KEYDIR \
                     --confdir=$MTN_CONFDIR

                  chmod 0600 $MTN_DB
                  chown monotone:monotone $MTN_DB

                  echo "Creating Monotone server keypair..." >&2

                  yes "$MTN_KEY_PASSWD" |
                     $MTN --db=$MTN_DB genkey $MTN_KEY --quiet \
                     --no-standard-rcfiles --keydir=$MTN_KEYDIR \
                     --confdir=$MTN_CONFDIR

                  chown monotone:monotone $MTN_HOME/keys/*

                  echo "Monotone database created successfully." >&2
              fi
	   else
	      set +e
	      monotone_check_minimum_previous_version && \
		 monotone_migrate && \
		 monotone_rosterify && \
		 monotone_regenerate_caches
	      set -e
           fi

           echo "$MTN_KEY \"$MTN_KEY_PASSWD\"" > $MTN_CONFDIR/passphrases
           chown monotone:monotone $MTN_CONFDIR/passphrases
           chmod 0400 $MTN_CONFDIR/passphrases
           db_set monotone-server/passphrase ""
       fi

    ;;

    abort-upgrade|abort-remove|abort-deconfigure)

    ;;

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

# stop debconf
db_stop

# Those using dependency based boot sequencing and installing
# monotone before version 0.44-2 would miss the runlevel 2 symlink.
# Recover from this.  Try not to mess with local configuration --
# look for the specific combination of S and K links that we
# know was wrong.

if [ "$1" = "configure" ] && dpkg --compare-versions "$2" le "0.44-2" \
   && [ -L /etc/rc0.d/K[0-9][0-9]monotone ] \
   && [ -L /etc/rc1.d/K[0-9][0-9]monotone ] \
   && [ -L /etc/rc2.d/[SK][0-9][0-9]monotone ] \
   && [ -L /etc/rc3.d/S[0-9][0-9]monotone ] \
   && [ -L /etc/rc4.d/S[0-9][0-9]monotone ] \
   && [ -L /etc/rc5.d/S[0-9][0-9]monotone ] \
   && [ -L /etc/rc6.d/K[0-9][0-9]monotone ]
then
   update-rc.d -f monotone remove
fi

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

#DEBHELPER#

exit 0