[CentOS] Is my ssh private key already unlocked?

Sun Jan 9 18:55:35 UTC 2022
centos at niob.at <centos at niob.at>

Am 07.01.22 um 23:35 schrieb Robert Nichols:
> When I first ssh to a system, I am asked for the password to unlock 
> the private key file. Thereafter, that key file remains unlocked, and 
> subsequent ssh sessions will not prompt for a password. I can always 
> re-lock the key file by running "ssh-add -D". In a script I have that 
> runs sshfs to mount a remote directory, I want to re-lock that key 
> file _unless_ it was already unlocked, i.e., if I sshfs asks for a 
> password, I want to re-lock the key file immediately after the command 
> is run.
> How can I determine ahead of time whether the key file is already 
> unlocked? In the past (Centos 6) I could examine the output from 
> "ssh-add -l" determine that. Now, "ssh-add -l" just shows the public 
> key whether of not the private key has been unlocked. There is also no 
> apparent way to see whether or not sshfs asked for a password.
> Suggestions?
Look at ssh-add -T <pubkey-file>. This will test if the private key for 
the given public key is available through the agent.