Retry powershell loop

Question

I want to add 3 retries to the following code that copies a directory from a USB to a machine and after the copy it checks if two directories are equal. If after 3 retries they are not equal, I want to restore the previous config folder.

I am having trouble with how to implement the retries

[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")

if (Test-Path "D:\Upgrade\CONFIG") { $src_dir = "D:\Upgrade\CONFIG" }
elseif (Test-Path "F:\Upgrade\CONFIG") { $src_dir = "F:\Upgrade\CONFIG" }
elseif (Test-Path "G:\Upgrade\CONFIG") { $src_dir = "G:\Upgrade\CONFIG" }
else { $src_dir = "E:\Upgrade\CONFIG" }

$dest_dir = "C:\TEST\CONFIG"
$date_str = Get-Date -UFormat %d%b%Y
$time_str = Get-Date -UFormat %H%M%S
$archive_dir = "$dest_dir" + "." + "$date_str" + "." + "$time_str"

if (Test-Path $src_dir) { Ren "$dest_dir" "$archive_dir" -verbose; Copy-Item "$src_dir" "$dest_dir" -recurse -verbose }
else { [System.Windows.Forms.MessageBox]::Show("$src_dir found, could not complete !!!") }

$currentConfig = Get-ChildItem -Recurse $dest_dir | Where-Object { -not $_.PsIsContainer }


# NEED HELP WITH ADDING RETRIES HERE


$currentConfig | ForEach-Object {

 # Check if the file, from $dest_dir, exists with the same path under $src_dir
    If ( Test-Path ( $_.FullName.Replace($dest_dir, $src_dir) ) ) {

        # Compare the contents of the two files...
        If ( Compare-Object (Get-Content $_.FullName) (Get-Content $_.FullName.Replace($dest_dir, $src_dir) ) ) {

            # List the paths of the files containing diffs
            $_.FullName
            $_.FullName.Replace($dest_dir, $src_dir)

        }
    }   
}

Jason Snell · Accepted Answer · 2017-08-02 14:22:29Z

1

To try something more than once you will need to use a loop. Either a While loop or a Do While Loop. Basically, you would create a variable with a number value, and count down from that number. If at the end all three tries have been hit then the script can reset the config.

    $maxTries = 3
    While($maxTries -gt 0){
       # do work here
       # if process fails subtract 1 from maxTries
       # if process succeeds break out of looop
    }

answered Aug 2, 2017 at 14:22

Jason Snell

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2 Comments

user1984300 Over a year ago

so in my example, I would decrement the counter when the directories are not equal, and break if they are equal. Is that it or do i need another if statement?

Jason Snell Over a year ago

You would basically run the loop, do the work you want to be done, and if it's not done correctly reduce the number by 1. If the work is completed to your satisfaction you can use break to break out of the loop early.

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