https://github.com/nix-community/home-manager/pull/7117#issuecomment-3018582819
noted that #7117 broke compatibility with forwarding ssh-agents using
`ssh -A`/`ForwardAgent`. In order to continue supporting the fix for
the issue raised in #5997 and address the compatibility problem
mentioned by @euank, this commit introduces the solution described in
https://github.com/nix-community/home-manager/pull/7117#issuecomment-3025001779.
The code now checks the following:
1. is this shell part of an SSH connection and is `SSH_AUTH_SOCK` set?
if so, assume the socket variable was set by sshd to point at a
forwarded socket; bail out to skip setting `SSH_AUTH_SOCK".
1. is the current process a child of `gpg-agent --daemon`? if so, then
bail out to skip setting `SSH_AUTH_SOCK`.
1. if we got this far, then set `SSH_AUTH_SOCK`.
I've tested this fix locally and can confirm that both #5997 as well as
the regression are fixed.
Signed-off-by: squat <lserven@gmail.com>
1fa73bb2cc