On 14.6.1, system library path is now in group.com.apple.photolibraryd.private.plist

[RhetTbull]

In earlier versions of macOS, the system library path can be read from:

Containers/com.apple.photolibraryd/Data/Library/Preferences/com.apple.photolibraryd.plist

On 14.6.1 it is now in:

Containers/com.apple.photolibraryd/Data/Library/Preferences/group.com.apple.photolibraryd.private.plist

There's also a private API:

PrivateFrameworks/PhotoLibraryServicesCore.framework/PLLibraryBookmarkManager.h
2:@interface PLLibraryBookmarkManager : NSObject {

I wonder if this can be used to retrieve all the libraries that photolibraryd knows about?

Also, in the PLLibraryBookmarkManagerBookmarksByPath key of the usual plist file, there are bookmarks to all known Photos libraries. This might be a more robust means of getting a list of all libraries.