postinst is in virt-viewer 6.0-2.
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 | #!/bin/sh -e
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] ; then
if [ -x /usr/bin/spice-xpi-client-remote-viewer ]; then
update-alternatives --install /usr/bin/spice-xpi-client \
spice-xpi-client /usr/bin/spice-xpi-client-remote-viewer 70
fi
fi
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