Plymouth password handling.

[LAHAYE Olivier]

After more tests, the following works fine on Fedora-28, but not on CentOS-7.
SSHPASS="$(plymouth ask-for-password --prompt 'Please, enter password:')"

I'll try to identify where is the problem and maybe file a bug against plymouth.
1st strace indicates that I hit:
ply-boot-server.c:ply_boot_connection_send_answer():285:ply_trace ("could not finish writing answer: %m");
While plymouthd server was able to get the password.
It seems unable to give it back to the plymouth command.

Cheers,

--
   Olivier LAHAYE
   CEA DRT/LIST/DIR
________________________________
De : plymouth [plymouth-bounces at lists.freedesktop.org] de la part de LAHAYE Olivier
Envoyé : mardi 3 juillet 2018 18:22
À : plymouth at lists.freedesktop.org
Objet : [PROVENANCE INTERNET] Plymouth password handling.


Hi,

I've written a complex them to handle systemimager imaging process.
Everythings works perfectly and I can even image a system and finish boot without rebooting.

I'm now in the process og having deployemnt onver an ssh tunnel.
My dracut module is able to handle local ssh keys, retreive a public key using curl or rsync, but a more simple way would be to ask for ssh password.

I'm testing on CentOS-7 latest update.

My theme (script) works fin asking for a password, but I'm totally unable to retreive it or use it.

I've tried 3 aproaches.
1/ without using the --command => unable to retreive the password from standard input.
SSHPASS="$(plymouth ask-for-password --prompt 'Please, enter password:')" sshpass -e ssh oscar-server 'hostname' > /tmp/result
=> Doesn't work. $SSHPASS is empty.

plymouth ask-for-password --prompt 'Please, enter password:' > /tmp/password
=> creates an empty password.

2/ using the --command => I must type the password twice???!!!
plymouth ask-for-password --prompt "Please, enter password:" --command "ssh my-server 'hostname'" --number-of-tries=3 > /tmp/result
=> 1st time I tiype password: the password dialog close when I hit enter. Then I type blindly and it works :-/
In text mode, I see the plymouth password prompt, I type the password, hit enter and then I get the ssh password propt, I reenter password and it works.

3/ using systemd-ask-password => doesn't display password dialog under plymouth and not available on centos-6...
SSHPASS="$(systemd-ask-password 'SSH password')" sshpass -e ssh oscar-server 'hostname' > /tmp/result
 => Works in text mode. In GUI mode, no password dialog appears.
=> Not available on centos-6 (that I have to support as it's still maintained).

Any advise or help would be greatly apreciated.

github theme source:
https://github.com/finley/SystemImager/tree/initrd-from-imageserver-and-dont-package-initrd/lib/dracut/modules.d/51systemimager/plymouth_theme

Inside this directory, my plymouth_test.sh script.

--
   Olivier LAHAYE
   CEA DRT/LIST/DIR
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