preinst is in fai-nfsroot 5.3.6ubuntu1.
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 | #!/bin/sh -e
if [ ! -f /.THIS_IS_THE_FAI_NFSROOT ]; then
echo "ERROR: The package fai-nfsroot can only be installed inside the nfsroot."
exit 1
fi
dpkg-divert --package fai-nfsroot --add --rename /etc/init.d/rcS
exit 0
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