preinst is in apt-cacher-ng 3.1-1build1.
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 | #!/bin/sh -e
LASTVERSION=0.7.19-2~
NAME=apt-cacher-ng
CFG=/etc/$NAME
case "$1" in
install|upgrade)
if dpkg --compare-versions "$2" le "$LASTVERSION"; then
for cfn in backends_debvol backends_ubuntu backends_debian ; do
mkdir -p $CFG/oldconffiles
mv -f $CFG/$cfn $CFG/oldconffiles 2>/dev/null ||:
done
fi
esac
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