# Hard‑coded paths
$IsoPath    = "C:\path\to\foo.iso"
$MountPoint = "C:\readonlydir"

# Normalize ISO path for comparison
$isoFull = (Resolve-Path $IsoPath).Path

# Check if ISO is already mounted
$mounted = Get-DiskImage -ImagePath $isoFull -ErrorAction SilentlyContinue

if ($mounted -and $mounted.Attached) {
    Write-Host "ISO is already mounted. Exiting."
    exit 0
}

# Mount the ISO
$diskImage = Mount-DiskImage -ImagePath $isoFull -PassThru

# Wait for the system to assign a volume
$vol = $null
while ($vol -eq $null) {
    Start-Sleep -Milliseconds 200
    $vol = Get-Volume -DiskImage $diskImage -ErrorAction SilentlyContinue
}

Write-Host "ISO mounted as volume: $($vol.DriveLetter):"

# Ensure the mount point directory exists
if (-not (Test-Path $MountPoint)) {
    New-Item -ItemType Directory -Path $MountPoint | Out-Null
}

# Convert drive letter to volume GUID path
$volObj   = Get-Volume -DriveLetter $vol.DriveLetter
$guidPath = "\\?\Volume{$($volObj.Guid)}\"

# Mount the volume into the directory
mountvol $MountPoint $guidPath

Write-Host "Mounted ISO volume at directory: $MountPoint"