Perform file verification check with Copy-Item - powershell

Question

The following script creates a folder named the specified date on the servers in servers.txt, then copies the folder from which the script is run to that folder.
For example, it creates the folder "3-22-15 (night)" on SERVER1, SERVER2, etc., then copies "Directory Containing the Script" to "3-22-15 (night)".
$CurrentLocation = get-location
$DeploymentDate = "3-22-15 (night)"
Foreach($server in get-content "servers.txt"){
New-Item -ErrorAction SilentlyContinue -ItemType directory -Path \\$server\C$\Deployments\$DeploymentDate
copy-item -Path $CurrentLocation -Destination \\$server\C$\Deployments\$DeploymentDate\ -ErrorAction SilentlyContinue -recurse
}
How do I modify the script to include file verification for each file that is copied to \\$server\C$\Deployments\$DeploymentDate\?
I would like it to output an error message with the file that does not pass the verification check, but to continue copying.
I was going to try something like this:
function SafeCopy ($SourcePath,$DestinationPath,$SourceFileName) {
#MD5 Check Function
function Check-MD5 ($FilePath) {
$md5=New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$hash=[System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($FilePath)))
Return $hash
} # EndOf function Check-MD5
$MD5Source=Check-MD5 $SourcePath
Copy-Item $SourcePath\$SourceFileName $DestinationPath
$MD5Destination=Check-MD5 $DestinationPath
if (Test-Path $DestinationPath) {
if ($MD5Destination -match $MD5Source) {
Write-Host "`nThe file `"$SourcePath`" has been copied in `"$DestinationPath`" successfully.`n" -ForegroundColor DarkGreen
} else {
Write-Host "`nThe file `"$SourcePath`" has been copied in `"$DestinationPath`" but the CRC check failed!`n" -ForegroundColor DarkRed
}
} else {
Write-Host "`nThe file `"$SourcePath`" has not been copied in `"$DestinationPath`"!`n" -ForegroundColor DarkRed
}
} # EndOf function SafeCopy
But I'm not sure how to implement it.

Answer 1

I am not a talented scripter nor do I play one on the radio but I've put this together and it seems to work. As mentioned, the larger the filesize being compared, the slower it goes.
Param
(
[parameter(Mandatory=$true,Position=1,ValueFromPipeLine=$true)][string]$source,
[parameter(Mandatory=$true,Position=2,ValueFromPipeLine=$true)][string]$dest
)
$countsource = #(Get-ChildItem -Path $source -Directory)
$countdest = #(Get-ChildItem -Path $dest -Directory)
IF($countsource = $countdest){
"$source equals $dest"
}
Else{
"$source does not match $dest"
}
Sample usage and output. TODO: Add folder item count compare, warn or break if the folders do not have the same number of items (subfolders and files).
So copy the folder then run Folder-Compare as a function once the copy is finished.
PS C:\Scripts> .\Folder-Compare.ps1 -source C:\Scripts\temp -dest C:\aaa
C:\Scripts\temp does not match C:\aaa