[MacPorts] #54286: Keychain integration no longer works after upgrading to macOS Sierra

[MacPorts]

#54286: Keychain integration no longer works after upgrading to macOS Sierra
--------------------------+--------------------
  Reporter:  Feuermurmel  |      Owner:
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:  wontfix      |   Keywords:
      Port:  openssh      |
--------------------------+--------------------

Comment (by Feuermurmel):

 Ahumm. This was not obvious for me. I have to use macOS' `/usr/bin/ssh-
 add` to manage the identities stored in the ssh-agent, even though I'm
 using MacPorts' `/opt/local/bin/ssh` to then use those identities. So
 something like this:

 {{{#!sh
 $ # Add the passwords to the user's keychain and the keys to the agent.
 $ /usr/bin/ssh-add -K
 Enter passphrase for /Users/michi/.ssh/id_rsa:
 Identity added: [...]/.ssh/id_rsa ([...])
 Identity added: [...]/.ssh/id_ed25519 ([...])
 $ # After a reboot, add the keys to the agent again.
 $ /usr/bin/ssh-add -A
 Identity added: [...]/.ssh/id_rsa ([...])
 Identity added: [...]/.ssh/id_ed25519 ([...])
 $ # Connect using MacPorts' `ssh`.
 $ ssh [...]
 }}}

 I just hope the versions of OpenSSH provided by macOS and MacPorts never
 have incompatible in a way that breaks this interaction.

--
Ticket URL: <https://trac.macports.org/ticket/54286#comment:2>
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