preinst is in file-rc 0.8.18.
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 50 51 52 53 54 55 56 57 58 | #! /bin/sh
# preinst script for file-rc
#
# see: dh_installdeb(1)
set -e
# summary of how this script can be called:
# * <new-preinst> `install'
# * <new-preinst> `install' <old-version>
# * <new-preinst> `upgrade' <old-version>
# * <old-preinst> `abort-upgrade' <new-version>
#
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
# see #812337 + #285835, #805487
divert() {
dpkg-divert --package file-rc --add --rename \
--divert /usr/sbin/update-rc.d.init-system-helpers /usr/sbin/update-rc.d
dpkg-divert --package file-rc --add --rename \
--divert /usr/sbin/invoke-rc.d.init-system-helpers /usr/sbin/invoke-rc.d
dpkg-divert --package file-rc --add --rename \
--divert /usr/share/man/man8/update-rc.d.8.gz.init-system-helpers /usr/share/man/man8/update-rc.d.8.gz
dpkg-divert --package file-rc --add --rename \
--divert /usr/share/man/man8/invoke-rc.d.8.gz.init-system-helpers /usr/share/man/man8/invoke-rc.d.8.gz
}
case "$1" in
install)
divert
;;
upgrade)
if dpkg --compare-versions "$2" lt 0.8.17 ; then
divert
fi
;;
abort-upgrade)
;;
*)
echo "preinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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