[Bug 1323] ssh-add: add an option to disable passphrase querying (batch mode)

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1323

Vincent Lefevre <vincent-openssh at vinc17.net> changed:

           What    |Removed                     |Added
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                 CC|                            |vincent-openssh at vinc17.net

--- Comment #2 from Vincent Lefevre <vincent-openssh at vinc17.net> ---
(In reply to Damien Miller from comment #1)
> ssh-add < /dev/null ?

The "< /dev/null" has no effect when $DISPLAY is NOT set:

$ env -u DISPLAY ssh-add < /dev/null
Enter passphrase for /home/vinc17/.ssh/id_rsa:

while it avoids that when DISPLAY is set:

$ ssh-add < /dev/null
ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory

BTW, I don't know why I get such an error instead of a silent failure
(note that $SSH_ASKPASS is not set). "ssh_askpass" is not documented in
the ssh-add man page.

My machine is under Debian/unstable, with OpenSSH_6.6.1p1.

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