[Bug 2191] New: Feature Proposal: Add an identity to the agent automatically when loading the identity

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2191

            Bug ID: 2191
           Summary: Feature Proposal: Add an identity to the agent
                    automatically when loading the identity
           Product: Portable OpenSSH
           Version: 6.4p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh-agent
          Assignee: unassigned-bugs at mindrot.org
          Reporter: tomo at cx4a.org

Created attachment 2396
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2396&action=edit
IdentityPersist patch

Background:

I want to add an identity to an authentication agent automatically
when I load the identity.  Gnome-keyring has such a feature by using a
modified ssh-agent, but I don't want to run the gnome-keyring's agent
only for this feature.

Specification:

I propose to add two options called IdentityPersist and
IdentityPersistConfirm to accomplish this feature.

IdentityPersist can take a boolean value or a time value like:

    # keep identities forever
    IdentityPersist yes
    # keep identities for 5 minutes
    IdentityPersist 300 

If the value is true or a time, then ssh-agent will try to add an
identity to itself automatically when the identity is being loaded.
If the time value is given, ssh-agent will forget the identity in
seconds the value specified.  The default value is false.

IdentityPersistConfirm can take a boolean value.  If the value is
true, then ssh-agent will confirm to an user that the identity should
be added or not.  The default value is false.

Implementation and test:

I have attached a patch.  It's a tiny change, so you can read the
modification in few minutes.  I have tested on Debian/GNU Linux 7.0.
I have also checked the patch doesn't break a build on Debian/GNu
Linux 7.0 and OpenBSD 5.4.

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