This file is indexed.

preinst is in postgresql-common 129.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

# remove a no-longer used conffile
rm_conffile()
{
    PKGNAME="$1"
    CONFFILE="$2"

    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
        if [ "$md5sum" != "$old_md5sum" ]; then
            echo "Obsolete conffile $CONFFILE has been modified by you."
            echo "Saving as $CONFFILE.dpkg-bak ..."
            mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
        else
            echo "Removing obsolete conffile $CONFFILE ..." 
            rm -f "$CONFFILE"
        fi
    fi
}

case "$1" in
    install|upgrade)
        # Upgrade from previous versions
        if dpkg --compare-versions "$2" lt-nl "96"; then
            rm_conffile postgresql-common /etc/postgresql-common/autovacuum.conf
            rm_conffile postgresql-common /etc/cron.d/postgresql-common
        fi

	if dpkg --compare-versions "$2" lt-nl "111~"; then
	    # versions 109 and 110 installed common init script with wrong
	    # priority
	    for l in 2 3 4 5; do
		if [ -L /etc/rc${l}.d/S20postgresql -a ! -L /etc/rc${l}.d/S19postgresql ]; then
		    echo "Fixing init script priority of /etc/rc${l}.d/S20postgresql to S19..." >&2
		    mv /etc/rc${l}.d/S20postgresql /etc/rc${l}.d/S19postgresql
		fi
	    done
	    for l in 0 1 6; do
		if [ -L /etc/rc${l}.d/K20postgresql -a ! -L /etc/rc${l}.d/K21postgresql ]; then
		    echo "Fixing init script priority of /etc/rc${l}.d/K20postgresql to K21..." >&2
		    mv /etc/rc${l}.d/K20postgresql /etc/rc${l}.d/K21postgresql
		fi
	    done
	fi
	# Remove obsolete init script from postgresql-8.3. It provides
	# "postgresql" which is also provided by our common init script, and
	# insserv chokes on this. Note that there is no reason to stop/restart
	# postgresql-8.3, the new init script will just take over.
	if dpkg --compare-versions "$2" lt-nl "112~"; then
	    rm_conffile postgresql-8.3 /etc/init.d/postgresql-8.3
	fi

	dpkg-divert --package postgresql-common --rename --divert /usr/bin/pg_config.libpq-dev --add /usr/bin/pg_config
        ;;

    abort-upgrade)
        ;;

    *)
        echo "$0 called with unknown argument \`$1'" 1>&2
        exit 1
        ;;
esac