Powershell - Compress files based on the contents of another zip file

Question

I have a zip file that has to be extracted to a destination folder. Before I extract I want to backup ONLY the root files and the sub directories that will be replaces by extracting the zip file.

Can I write up a script that will be find out the sub directories within the .zip and backup those from the destination folder (if they are available)?

And I will be using this script in Azure DevOps.

Answer 1

You can use PowerShell to discover the zip file content, check if it exists in the destination folder, if yes - do a backup. for example:

$ZipFilePath = "C:\Users\sabramczyk\Documents\Scrum.zip"
$DestinationFolder = "c:\test"

Add-Type -assembly "System.IO.Compression.FileSystem"
    
if (![System.IO.File]::Exists($ZipFilePath)) {
    throw "Zip file ""$ZipFilePath"" not found."
}

$ZipContent = ([System.IO.Compression.ZipFile]::OpenRead($ZipFilePath)).Entries.FullName
foreach($zipContent in $ZipContent)
{
    if(Test-Path $DestinationFolder+"/"+$zipContent)
    {
        # Do backup
    }
}