preinst is in qemu-system-common 1:2.5+dfsg-5ubuntu10.
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 18 19 20 21 22 23 | #!/bin/sh
set -e
case "$1" in
install|upgrade)
# Add the kvm group unless it's already there
if ! getent group kvm >/dev/null; then
addgroup --quiet --system kvm || true
fi
esac
# Automatically added by dh_installudev
if [ "$1" = install ] || [ "$1" = upgrade ]; then
if [ -e "/etc/udev/rules.d/z60_qemu-system-common.rules" ]; then
if [ "`md5sum \"/etc/udev/rules.d/z60_qemu-system-common.rules\" | sed -e \"s/ .*//\"`" = \
"`dpkg-query -W -f='${Conffiles}' qemu-system-common | sed -n -e \"\\\\' /etc/udev/rules.d/z60_qemu-system-common.rules '{s/ obsolete$//;s/.* //p}\"`" ]
then
rm -f "/etc/udev/rules.d/z60_qemu-system-common.rules"
fi
fi
fi
# End automatically added section
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