Reuse in PowerShell a running PuTTY agent (pageant)

I made this work, using the same Cygwin tools (i.e., both ssh-pageant and Cygwin OpenSSH client) in a PS session.

So I would do (assuming ssh-pageant is already running from Msys2):

> cd <dir where ssh-pageant is>> .\ssh-pageant -r -a "$env:USERPROFILE\tmp\.ssh-pageant-$env:USERNAME"SSH_AUTH_SOCK='C:\Users\USER1\tmp\.ssh-pageant-USER1'; export SSH_AUTH_SOCK;> $env:SSH_AUTH_SOCK='C:\Users\USER1\tmp\.ssh-pageant-USER1'> .\ssh myserverLogged in to myserver

I have added this to my profile.ps1 (again, it will work when ssh-pageant is already running when I start the PS session)

$env:MSYS2_DIR=<mydir># Assuming a proxy ssh agent is already running$env:SSH_AUTH_SOCK="$env:MSYS2_DIR\tmp\.ssh-pageant-$env:USERNAME"# We have to make sure we use Msys2 OpenSSH ssh client, not Windows OpenSSH ssh client function ssh_msys2 {    & $env:MSYS2_DIR\usr\bin\ssh.exe $args}

If an ssh-pageant is not yet active, this should work (not tested yet; the PID number may be different):

> cd <dir where ssh-pageant is>> .\ssh-pageant -r -a "$env:USERPROFILE\tmp\.ssh-pageant-$env:USERNAME"SSH_AUTH_SOCK='C:\Users\USER1\tmp\.ssh-pageant-USER1'; export SSH_AUTH_SOCK;SSH_PAGEANT_PID=714; export SSH_PAGEANT_PID;echo ssh-pageant pid 714;> $env:SSH_AUTH_SOCK='C:\Users\USER1\tmp\.ssh-pageant-USER1'> $env:SSH_PAGEANT_PID=714> .\ssh myserverLogged in to myserver

Still have to test a couple of points, and automate the operation.
In particular, executing ssh-pageant, detecting the PID # if it is returned, and setting environment variable SSH_PAGEANT_PID from PS if that is the case.This is a little bit more cumbersome than in Msys2, since ssh-pageant spits something directly executable by bash.