preinst is in libatlas-base-dev 3.10.1-4.
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
# In 3.10.1-1, some symlinks were moved out of the alternatives system
# The following ensures that they are freed by the alternatives system before unpacking
if [ $1 = "upgrade" -a `dpkg --compare-versions "$2" ge 3.8.4-4~exp1` -a `dpkg --compare-versions "$2" lt 3.10.1-1` ]
then
update-alternatives --remove libblas.so /usr/lib/atlas-base/atlas/libblas.so
fi
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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