preinst is in gallery2 2.3-1ubuntu6.
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 | #! /bin/sh
set -e
EG=/etc/gallery2/apache.conf
EGB=/etc/gallery2_backup/apache.conf
if [ "$1" = upgrade ]; then
if [ -d $EG ]; then
mv $EG $EGB
fi
fi
exit 0
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