This file is indexed.

preinst is in samba 2:3.6.3-2ubuntu2.

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 (from http://wiki.debian.org/DpkgConffileHandling)
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 \"\\\\'^ $CONFFILE[[:space:]]'{s/ obsolete$//;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
}

# remove the obsolete init script (replaced by an upstart job)
if dpkg --compare-versions "$2" lt-nl 2:3.4.5~dfsg-2ubuntu2
then
	rm_conffile samba /etc/init.d/samba
	update-rc.d samba remove
fi