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In order to have control over the order that updates are applied a numbering system was created for the update files. These values were not actually used. The updates were sorted by DN length and in most cases this was adequate for proper function. The exception was with roles where in some cases a role was added as a member of a permission before the role itself was added so the memberOf value was never created. Now updates are computed and applied in blocks of 10. https://fedorahosted.org/freeipa/ticket/3377
The update files are sorted before being processed because there are cases where order matters (such as getting schema added first, creating parent entries, etc). Updates are applied in blocks of ten so that any entries that are dependant on another can be added successfully without having to rely on the length of the DN to get the sorting correct. The file names should use the format #-<description>.update where # conforms to this: 10 - 19: Schema 20 - 29: 389-ds configuration, new indices 30 - 39: Structual elements of the DIT 40 - 49: Pre-loaded data 50 - 59: Cleanup existing data 60 - 69: AD Trust 70 - 79: Reserved 80 - 89: Reserved These numbers aren't absolute, there may be reasons to put an update into one place or another, but by adhereing to the scheme it will be easier to find existing updates and know where to put new ones.