CODEWITHSUNDEEP
powershell
Thomas Tuzi
Thomas Tuzi

Reputation: 11

Powershell Prompt user for drive letter

I have a script that maps files in order to run VHDs. But the drive letter can change when you run it from one machine to another. How can I prompt the user which drive letter has the folder? or determine which drive letter has \Program Files\Microsoft Learning\20414\Drives\?

Actual Script Below:

Set-VHD -Path "D:\Program Files\Microsoft Learning\20414\Drives\20414B-LON-DC1\Virtual Hard Disks\20414B-LON-DC1.vhd” -ParentPath "D:\Program Files\Microsoft Learning\Base\Drives\MT12-WS12-LON-DC1-TMP.vhd”

Upvotes: 1

Views: 2198

Answers (3)

Remus Rusanu
Remus Rusanu

Reputation: 294177

This is what I use to get the drive of a mounted VHD:

Write-Output "Mount-VHD $targetVhdx..."
$mountVhd = Mount-VHD -Path $targetVhdx -Passthru

Write-Output "Select mounted DriveLetter..."
$mountDrive = $mountVhd | Get-Disk | Get-Partition | Get-Volume | Where-Object {$_.FileSystemLabel -ne 'System Reserved'} | Select DriveLetter

Upvotes: 0

Ansgar Wiechers
Ansgar Wiechers

Reputation: 200193

I'd use a slightly different approach from what vonPryz suggested, because Get-PSDrive will enumerate more than just disk/network drives. Using WMI should provide slightly better performance:

$subfolder = "Program Files\Microsoft Learning\20414\Drives"

$drivesPath = gwmi Win32_LogicalDisk -Filter 'DriveType=3 OR DriveType=4' | % {
  Join-Path $_.DeviceID $subfolder
} | ? { Test-Path -LiteralPath $_ }

Upvotes: 1

vonPryz
vonPryz

Reputation: 24071

Use Read-Host to prompt for user input. Like so,

$vhdLocation = read-host "Enter path for VHD file"

Instead of prompting user, you could list all the drives and check if the directory exists with Get-PSDrive, Test-Path and Join-Path. Like so,

get-psdrive | ? {
$_.root -match "[c-z]:\\" -and (test-path $(join-path $_.root "Program Files\Microsoft Learning\20414\Drives\"))
}

$_.root -match "[c-z]:\\" will match drive letters C: to Z:.

$(join-path $_.root "Program Files\Microsoft Learning\20414\Drives\") will create a valid syntax for path. That is, it will manage delimiters automatically.

test-path will return true if the path does exist.

Upvotes: 3

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