/lib/systemd/system/systemd-ask-password-plymouth.path is in plymouth 0.9.2-3ubuntu13.
This file is owned by root:root, with mode 0o644.
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 | [Unit]
Description=Forward Password Requests to Plymouth Directory Watch
Documentation=http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents
DefaultDependencies=no
Conflicts=shutdown.target
After=plymouth-start.service
Before=basic.target shutdown.target
ConditionKernelCommandLine=!plymouth.enable=0
ConditionKernelCommandLine=!nosplash
ConditionKernelCommandLine=splash
ConditionPathExists=/run/plymouth/pid
[Path]
DirectoryNotEmpty=/run/systemd/ask-password
MakeDirectory=yes
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