On 30 Jul, 2012, at 17:53, Ron Hunsinger wrote: > > On Jul 30, 2012, at 4:47 AM, Robert Martin <robmar...@frontiernet.net> wrote: > >> Just keep track of the device UUID for each path and last event ID that >> you're tracking. EventID's are tied to each device, so you have to know that >> the device has not changed behind your back. For example, this can happen if >> the user has switched to a cloned backup drive containing the folders you >> are tracking. If the UUID's don't match, you can alert the user and rebuild >> whatever it is you're doing. > > What you need to track is the UUID of the FSEventStore, together with the > last event ID. > > That is, there are three relevant IDs: > The volume itself has a UUID > Each volume has its own FSEventStore, with its own UUID > There is an event ID, that is meaningful only with respect to its > particular FSEventStore > > The FSEventStore gets invalidated and discarded at the slightest hint of > trouble; most commonly any time the volume is not unmounted properly. A > system crash, of course, fails to unmount any volume correctly, so it > invalidates the FSEventStores of all volumes mounted at the time. A full OS > install seems to also invalidate the FSEventStore. > > The volume's UUID persists across all those things, but not across an erase. > You can use it to be sure you're referring to the proper volume. > > You can get the volume's UUID from diskutil info. You can read the > FSEventStoreUUID from /.fseventsd/fseventsd-uuid
FSEventsCopyUUIDForDevice is the correct way to read the event store UUID. - m > > -Ron Hunsinger > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/mikey-san%40bungie.org > > This email sent to mikey-...@bungie.org _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
