preinst is in lilypond 2.18.2-4.1.
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49  | #!/bin/sh
#
# preinst script for the Debian GNU/Linux lilypond package
#   by Anthony Fok <foka@debian.org>
#   This is free software; see the GNU General Public Licence
#   version 2 or later for copying conditions.  There is NO warranty.
#   Last modified:  Mon,  5 Apr 1999 20:30:12 -0600
set -e
package=lilypond
font_supplier=public
font_typeface=lilypond
std_TEXMFMAIN=/usr/share/texmf
std_VARTEXFONTS=/var/spool/texmf
TEXMFMAIN=`kpsewhich -expand-var '$TEXMFMAIN'`
: ${TEXMFMAIN:=$std_TEXMFMAIN}
VARTEXFONTS=`kpsewhich -expand-var '$VARTEXFONTS'`
: ${VARTEXFONTS=$std_VARTEXFONTS}
LILYTEXINPUTS=$TEXMFMAIN/tex/$package
LILYMFINPUTS=$TEXMFMAIN/fonts/source/$font_supplier/$font_typeface
case "$1" in
    install|upgrade)
	# Clear out the old TFM and PK files in case the fonts were
	# left-over from previous installations
	rm -rf $VARTEXFONTS/tfm/$font_supplier/$font_typeface
	rm -rf $VARTEXFONTS/pk/*/$font_supplier/$font_typeface
	# Fix a silly bug in Debian's lilypond 1.0.17-1.  :-)
	if [ "$2" = "1.0.17-1" ]; then
	    rm -rf $VARTEXFONTS/tfm/$font_supplier/mf
	    rm -rf $VARTEXFONTS/pk/*/$font_supplier/mf
	fi
    ;;
    abort-upgrade)
    ;;
    *)
	echo "$0 called with unknown argument \`$1'" >&2
	exit 0
    ;;
esac
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