Check current safe-chain version in installation script

install-scripts/install-safe-chain.ps1

@@ -30,6 +30,46 @@ function Write-Error-Custom {
     exit 1
 }
 
+# Get currently installed version of safe-chain
+function Get-InstalledVersion {
+    # Check if safe-chain command exists
+    if (-not (Get-Command safe-chain -ErrorAction SilentlyContinue)) {
+        return $null
+    }
+
+    try {
+        # Execute safe-chain -v and capture output
+        $output = & safe-chain -v 2>&1
+
+        # Extract version from "Current safe-chain version: X.Y.Z" output
+        if ($output -match "Current safe-chain version:\s*(.+)") {
+            return $matches[1].Trim()
+        }
+
+        return $null
+    }
+    catch {
+        return $null
+    }
+}
+
+# Check if the requested version is already installed
+function Test-VersionInstalled {
+    param([string]$RequestedVersion)
+
+    $installedVersion = Get-InstalledVersion
+
+    if ([string]::IsNullOrWhiteSpace($installedVersion)) {
+        return $false
+    }
+
+    # Strip leading 'v' from versions if present for comparison
+    $requestedClean = $RequestedVersion -replace '^v', ''
+    $installedClean = $installedVersion -replace '^v', ''
+
+    return $requestedClean -eq $installedClean
+}
+
 # Fetch latest release version tag from GitHub
 function Get-LatestVersion {
     try {
@@ -114,6 +154,12 @@ function Install-SafeChain {
         $Version = Get-LatestVersion
     }
 
+    # Check if the requested version is already installed
+    if (Test-VersionInstalled -RequestedVersion $Version) {
+        Write-Info "safe-chain $Version is already installed"
+        exit 0
+    }
+
     # Build installation message
     $installMsg = "Installing safe-chain $Version"
     if ($ci) {