preinst is in dhcpcd 1:3.2.3-11.
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 24 25 | #!/bin/sh -e
# The name of the lease-change script changed.
# Move it here, but leave a link from the old name.
if [ -f /etc/dhcpc/dhcpcd.exe ] && [ ! -f /etc/dhcpcd.sh ]; then
mv /etc/dhcpc/dhcpcd.exe /etc/dhcpcd.sh
ln -s /etc/dhcpcd.sh /etc/dhcpc/dhcpcd.exe
fi
if [ -f /etc/dhcpc/config ] && [ ! -f /etc/default/dhcpcd ]; then
mv /etc/dhcpc/config /etc/default/dhcpcd
ln -s /etc/default/dhcpcd /etc/dhcpc/config
fi
# If upgrading from a version prior to 3.2.1, we create the
# file /etc/dhcpc/inhibit-duid so that hosts don't suddenly change
# their client-id and move IP addresses. New installations can use DUID
# from the start with no problems.
if [ $1 = upgrade ]; then
if [ -n $2 ] && dpkg --compare-versions $2 lt 3.2.1-1; then
echo "Remove this file to make dhcpcd use DUID-based client-ids" >/etc/dhcpc/inhibit-duid
fi
fi
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