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# SSH Agent Functions
# Mark Embling (http://www.markembling.info/)
#
# How to use:
# - Place this file into %USERPROFILE%\Documents\WindowsPowershell (or location of choice)
# - Import into your profile.ps1:
# e.g. ". (Resolve-Path ~/Documents/WindowsPowershell/ssh-agent-utils.ps1)" [without quotes]
# - Enjoy
#
# Note: ensure you have ssh and ssh-agent available on your path, from Git's Unix tools or Cygwin.
# Retrieve the current SSH agent PId (or zero). Can be used to determine if there
# is an agent already starting.
function Get-SshAgent() {
$agentPid = [Environment]::GetEnvironmentVariable("SSH_AGENT_PID", "User")
if ([int]$agentPid -eq 0) {
$agentPid = [Environment]::GetEnvironmentVariable("SSH_AGENT_PID", "Process")
}
if ([int]$agentPid -eq 0) {
0
} else {
# Make sure the process is actually running
$process = Get-Process -Id $agentPid -ErrorAction SilentlyContinue
if(($process -eq $null) -or ($process.ProcessName -ne "ssh-agent")) {
# It is not running (this is an error). Remove env vars and return 0 for no agent.
[Environment]::SetEnvironmentVariable("SSH_AGENT_PID", $null, "Process")
[Environment]::SetEnvironmentVariable("SSH_AGENT_PID", $null, "User")
[Environment]::SetEnvironmentVariable("SSH_AUTH_SOCK", $null, "Process")
[Environment]::SetEnvironmentVariable("SSH_AUTH_SOCK", $null, "User")
0
} else {
# It is running. Return the PID.
$agentPid
}
}
}
# Start the SSH agent.
function Start-SshAgent() {
# Start the agent and gather its feedback info
[string]$output = ssh-agent
$lines = $output.Split(";")
$agentPid = 0
foreach ($line in $lines) {
if (([string]$line).Trim() -match "(.+)=(.*)") {
# Set environment variables for user and current process.
[Environment]::SetEnvironmentVariable($matches[1], $matches[2], "Process")
[Environment]::SetEnvironmentVariable($matches[1], $matches[2], "User")
if ($matches[1] -eq "SSH_AGENT_PID") {
$agentPid = $matches[2]
}
}
}
# Show the agent's PID as expected.
Write-Host "SSH agent PID:", $agentPid
}
# Stop a running SSH agent
function Stop-SshAgent() {
[int]$agentPid = Get-SshAgent
if ([int]$agentPid -gt 0) {
# Stop agent process
$proc = Get-Process -Id $agentPid
if ($proc -ne $null) {
Stop-Process $agentPid
}
# Remove all enviroment variables
[Environment]::SetEnvironmentVariable("SSH_AGENT_PID", $null, "Process")
[Environment]::SetEnvironmentVariable("SSH_AGENT_PID", $null, "User")
[Environment]::SetEnvironmentVariable("SSH_AUTH_SOCK", $null, "Process")
[Environment]::SetEnvironmentVariable("SSH_AUTH_SOCK", $null, "User")
}
}
# Add a key to the SSH agent
function Add-SshKey() {
if ($args.Count -eq 0) {
# Add the default key (~/id_rsa)
ssh-add
} else {
foreach ($value in $args) {
ssh-add $value
}
}
}
# Start the agent if not already running; provide feedback
$agent = Get-SshAgent
if ($agent -eq 0) {
Write-Host "Starting SSH agent..."
Start-SshAgent # Start agent
Add-SshKey # Add my default key
} else {
Write-Host "SSH agent is running (PID $agent)"
}
@murdoch

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murdoch commented Aug 26, 2014

@krobe

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krobe commented Sep 22, 2014

@murdoch This is the code posh-git uses.

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