prerm is in usrmerge 9.
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 | #!/bin/sh -e
can_remove() {
dpkgconf='/etc/dpkg/dpkg.cfg.d/usrmerge'
[ -e "$dpkgconf" ] || return 0
local pkgs="$(awk '/^# [^ ]+$/ { print $2 }' $dpkgconf)"
local installed="$(dpkg-query --showformat='${Package}\n' --show $pkgs 2> /dev/null)"
if [ "$installed" ]; then
cat <<END
Some installed packages have not yet been converted to support usrmove:
$installed
If you remove this package then updating them will fail.
Please delete $dpkgconf to confirm that you understand this.
END
exit 1
fi
}
case "$1" in
remove)
# check if the package can be safely removed
can_remove
;;
esac
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