[Trigger]
Type = Package
Operation = Install
Operation = Upgrade
Target = *

[Action]
Description = Ensuring /dev/stdin exists...
When = PreTransaction
Exec = /usr/bin/sh -c "[ -e /dev/stdin ]  || ln -sf /proc/self/fd/0 /dev/stdin; [ -e /dev/stdout ] || ln -sf /proc/self/fd/1 /dev/stdout; [ -e /dev/stderr ] || ln -sf /proc/self/fd/2 /dev/stderr"