File server to SharePoint Online: folder to document library structure diff tool? - sharepoint

Question

Do you know if there is any kind of tool (it would be cool if it is for free) that compares the file structure of a folder in a File Server to a SharePoint Online Document Library and tells you the difference?
The point is we are getting hands on a partially migrated File Server to SharePoint Online and the migration status of some folders is unknown to us. We already have a 3rd party migration tool to finish the migration but we need to know what is still pending to be uploaded. Any idea?
Thanks in advance.

Answer 1

We use sharegate for our migration. In your situation I might just run migrations on small sections with it set to "skip existing". That doesn't directly answer your question though.
In your case I would map both the File server and the SharePoint online instance as drives on a computer (using WebDAV) and hack together an app in your favorite language to compare the two directory structures.
Here is a java program that does that:
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
public class Launcher {
static PrintWriter fileOut;
public static void main(String[] args) throws IOException {
File fileStore = new File("N:\\"); //filestore dir top level
File sp = new File("M:\\");//sp directory top level (mapped)
File out = new File("C:\\Temp\\results.txt");
fileOut = new PrintWriter(out);
recurse(fileStore, sp);
fileOut.close();
}
private static void recurse(File dir1, File dir2)
{
File [] dirFiles;
if(dir2 == null)
dirFiles = new File[0];
else
dirFiles=dir2.listFiles();
File match;
for(File f1 : dir1.listFiles())
{
System.out.println(f1.getAbsolutePath());
match=null;
for(File f2:dirFiles)
if(f1.getName().equalsIgnoreCase(f2.getName()))
match=f2;
if(f1.isDirectory() && f1.canRead())
try{
recurse(f1,match);
}
catch(Exception e){}
else if (match == null)
fileOut.write(f1.getAbsolutePath()+"\r\n");
}
}
}
It writes to the given text file each file that is not in the 2nd directory structure.
You could run this code in an IDE like eclipse.