function Get-FileMD5 {
    ...
}

function Copy-files() {
    param (
         [Parameter (Mandatory = $true)]
            [string] $SRC_DIR,
         [Parameter (Mandatory = $true)]
            [string] $DST_DIR
        )
		
    [string] $result = "success"        
    
    $SourceFiles = GCI -Recurse $SRC_DIR | ? { $_.PSIsContainer -eq $false} 
    $SourceFiles | % { 

        $src = $_.FullName 
	    try
	    {		
		   ...		    
		    if ($cpy -eq $true) { 
			    
			    if (!(test-path $dest)) {
				    New-Item -ItemType "File" -Path $dest -Force   
			    }	

			    Copy-Item -Path $src -Destination $dest -errorAction stop  !!!555!!!
		    }				    
	    }
	    catch
	    {
            $result = "failed"            
		    Write-Host "Unable to copy " $src
		    break  
	    }	
    }
    return $result
}

# копируем из репазитария в дев
[string] $copy_dev_result = "success"
. "$PSScriptRoot\copy_files.ps1"
$copy_dev_result = Copy-files $repo_dir $dev_dir