Re: Is cloning the same as copying in APFS?
Re: Is cloning the same as copying in APFS?
- Subject: Re: Is cloning the same as copying in APFS?
- From: Rick Mann <email@hidden>
- Date: Tue, 27 Jun 2017 22:18:14 -0700
Yes, that seems the right way to do it. Thanks!
--
Rick Mann
email@hidden
> On Jun 27, 2017, at 16:07, Charles Srstka <email@hidden> wrote:
>
>>> On Jun 27, 2017, at 4:45 PM, Rick Mann <email@hidden> wrote:
>>>
>>>
>>>> On Jun 27, 2017, at 14:30 , Charles Srstka <email@hidden>
>>>> wrote:
>>>>
>>>> On Jun 27, 2017, at 4:17 PM, Rick Mann <email@hidden> wrote:
>>>>
>>>> Thanks for that, Charles!
>>>>
>>>> I wasn't sure because of the existence of the clonefile() call in
>>>> <sys/clonefile.h>, implying that operation was different from copyfile(),
>>>> but looking more closely at the sample code, I see that you can call
>>>> copyfile() with COPYFILE_CLONE, which seems like it will clone if possible
>>>> and copy if not.
>>>>
>>>> But there didn't seem to be equivalent calls in NSFileManager, hence my
>>>> question.
>>>
>>> Apple clearly wants the clone feature to get used. :-) The ability to do a
>>> copy the old way is still there if you drop down to C, but since I can’t
>>> think of too many reasons to want to do that, it makes sense to leave it
>>> out of the high-level API.
>>
>> Agreed. Thanks for the code, and for showing the other techniques. In my
>> case, I still have to support HFS+, and I want to do that with hard links. I
>> wish there was an API to clone-or-hardlink, but I can do that.
>
> That should be easy enough to do. One thing I’d recommend would be checking
> the volumeSupportsFileCloningKey key on URLResourceValues, rather than
> checking the file system type itself. That way, if APFS gets supplanted by
> some even better file system in the future, you’ll already support it.
>
> Charles
>
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