preinst is in qgis 2.18.17+dfsg-1.
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
if [ "$1" = "install" -o "$1" = "upgrade" ]; then
# Remove obsolete diversions
for i in /usr/bin/qgis /usr/bin/qbrowser; do
pkg=$(dpkg-divert --listpackage $i)
if [ -n "$pkg" -a "$pkg" = qgis-plugin-grass -o "$pkg" = qgis-provider-grass ]; then
dpkg-divert --package $pkg --remove $i
fi
done
fi
exit 0
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