[systemd-devel] Text input on startup (tty-force) disabling after a few seconds

[Peeters Simon]

2013/6/19 Natanji <natanji at gmail.com>:
> Hi everyone,
> I'm somewhat new to systemd and have a problem. I would like to run a
> custom script with systemd on startup that will ask me for a password
> and mount a Truecrypt volume with it. The script and unit file I wrote
> can be found below.
>
> Now, this setup does work *somewhat* - basically it will ask me for my
> Truecrypt password on startup and do the mounting as it should. But when
> I wait a few seconds during startup, entering the password no longer
> works. I just have a few seconds after the password prompt appearing to
> enter it; if I wait 5-10 seconds nothing will happen anymore.
>
> That seems like weird and unintended behaviour to me. Is this a bug, or
> can you point me in the right direction about what I'm doing wrong if I
> want some sort of keyboard interaction during system startup with
> systemd? I mean, that is a useful and sometimes needed feature, right?
>
>
>
> Unit file:
> -----------
> [Unit]
> Description=Mount Truecrypt-encrypted filesystems
> ConditionFileIsExecutable=/usr/bin/truecrypt
> Requires=truecrypt-unmount.service
> Before=display-manager.service
>
> [Service]
> Type=oneshot
> ExecStart=/etc/mount_truecrypt
> StandardInput=tty-force
> RemainAfterExit=yes
>
> [Install]
> WantedBy=multi-user.target
>
> /etc/mount_truecrypt:
> -----------
> #!/bin/bash
> sudo echo Please enter the password to mount your TrueCrypt volumes...
> stty -echo
> read password
> stty echo
> echo C:
> echo $password | sudo truecrypt -t -k ""
> --fs-options="rw,exec,users,async,uid=root,gid=users,umask=077,noatime"
> --mount-options=system --protect-hidden=no /dev/sda1 /media/C > /dev/null
> echo ...done.

It might be a bug in the tty-force handling, but this is not a usecase
for tty-force, you would be better of using systemd-ask-password

I sugest you drop the StandardInput=tty-force from the service file
and use this as /etc/mount_truecrypt

#!/bin/sh

systemd-ask-password "Please enter the password to mount your
TrueCrypt volumes..." | truecrypt -t -k ""
--fs-options="rw,exec,users,async,uid=root,gid=users,umask=077,noatime"
--mount-options=system --protect-hidden=no /dev/sda1 /media/C >
/dev/null

# that is one line, but gmail will probably break it