preinst is in gerris 20131206+dfsg-7.
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 | #!/bin/sh -e
# From version 20090512-dfsg.1-1, there are both arch-dependent and
# arch-independent files in upstream's /usr/lib/gerris (with module libstokes
# added), so can no longer take /usr/lib/gerris as a symlink to
# /usr/share/gerris/lib.
if [ "$1" = "upgrade" ]; then
if dpkg --compare-versions "$2" lt-nl 20090512-dfsg.1-1; then
if [ -L /usr/lib/gerris ]; then
echo "Removing deprecated symlink /usr/lib/gerris"
rm /usr/lib/gerris
fi
fi
fi
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