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Re: How to suppress mounting externally attached disks temporarily
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Re: How to suppress mounting externally attached disks temporarily


  • Subject: Re: How to suppress mounting externally attached disks temporarily
  • From: Karl Kuehn <email@hidden>
  • Date: Mon, 4 May 2009 14:19:06 -0700

On May 4, 2009, at 10:50 AM, Thomas Tempelmann wrote:

For a data rescue tool I'm writing (iBored) I like to add the feature
to suppress mounting (and modifying, including auto-repair) of
just-attached disks.

I want the disk be read by the system, and have no problem with its
partitions being added to /dev/

But I don't want to allow any writing to it, if my app demands it.

So, either suppressing automount entirely, or forcing read-only
mounts, is what I need.

The UUID and name of the volumes on the disk are not known, so adding
exceptions to the fstab file is not an option, I think.

The old Mac OS made this easy: Simply get into a modal event polling
loop and swallow the "disk insert" event. With OS X, this isn't
possible any more. So, what's the trick to do this now?

I just had to do something of the same thing, but was looking for only disks on a list. The solution I came up with is as follows (and is working well):


1) Hook in with DAApprovalSessionRef

2) When a mount request comes in, put it on a list of things I want to approve, deny it, and set a callback to re-mount a second later with the options I want

3) When the second mount request comes through, allow it in

	A second variant that I thought of:

1) Hook in with DAApprovalSessionRef

2) Deny any mount request that comes in, set a callback to mount it with the options that you want, but this time call it with "kDADiskOptionPrivate", that should punch around your block.

i found this all a little awkward (since mostly I just wanted to control the mount point, the one item that does not make it into a DAApprovalSession), but it does work.

--
		Karl Kuehn
			email@hidden



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References: 
 >How to suppress mounting externally attached disks temporarily (From: Thomas Tempelmann <email@hidden>)

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