preinst is in usrmerge 17.
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 26 27 28 29 30 31 32 33 34 | #!/bin/sh -e
standalone_usr() {
local device_root=$(stat --printf='%d\n' /)
local device_usr=$(stat --printf='%d\n' /usr)
if [ "$device_root" != "$device_usr" ]; then
return 0
fi
return 1
}
booted_with_initramfs() {
# created by update-initramfs
if [ -d /run/initramfs/ ]; then
return 1
fi
return 0
}
has_initramfs() {
standalone_usr || return 0
booted_with_initramfs || return 0
echo "/usr is a standalone filesystem, this requires using an initramfs."
}
case "$1" in
install)
# check the prerequisites on the first install
if [ -z "$2" ]; then
has_initramfs
fi
;;
esac
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