[MacPorts] #61888: openssh-8.4p1 dropped support for launchd in ssh-agent

[MacPorts]

#61888: openssh-8.4p1 dropped support for launchd in ssh-agent
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  Reporter:  wcn3     |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  openssh  |
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Comment (by fhgwright):

 What I posted above wasn't intended as a workaround for the current
 problem, but rather as a mention of an ''additional'' long-standing
 problem that's not limited to the latest version.  It also isn't a
 "modification" of the system launch agent, but rather a recipe for
 deriving a new launch agent from the system version (note the different
 file names).  I'm not sure if that runs afoul of SIP or not, but it's moot
 as long as the agent isn't able to run correctly from `launchd` at all.

 There's never an issue with "two competing agents"; you can have as many
 agents running as you like (on different sockets).  But the ssh client
 will only talk to the one whose socket is specified in `SSH_AUTH_SOCK`.
 In fact, you can always launch another agent via the traditional method of
 `eval $(ssh-agent)`, but the resulting agent is effectively local to the
 Terminal window that launched it.  The advantage of running it as a
 LaunchAgent is that you get one instance shared among all Terminal
 windows.

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Ticket URL: <https://trac.macports.org/ticket/61888#comment:5>
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