On more than one occasion recently I have needed to convert quite large legacy WP Site Network sites using blogs.dir to the current structure using sitename/files, and I am looking for a standard and reliable way to do this.
I have googled, but not really found anything solid, hence me asking here.
I have scripted changes to move directories and wp search-replace paths on a per-network-site basis, and it works mostly with some tidying up required.
On small scale sites, this is trivial as it is not a heavy lift to manually change things, but for networks with hundreds or even thousands of sites, it is a different story.
Any suggestions appreciated!