DADiskMountWithArguments fails with "not permitted" error when a path is specified

This is on 10.12.5.

I'm seeing the same behavior. It doesn't occur in 10.12.4, but does in 10.12.5.

This functionality is fairly important to certain kinds of programs - in particular, bulk disk duplication programs.

In FlashCraft I use this functionality to mount volumes within the user's temporary folder, in order to prevent operating system services (such as Spotlight) from accessing the volume while it is being written.

@joconnor, have you filed a bug report?

It appears that the mount command line tool (which is used by DADiskMountWithArguments) no longer has the permissions needed to mount volumes with a custom path.

while the following fails:

$ mount -t udf -o nobrowse /dev/disk2 /tmp

mount_udf: mount_udf: open /dev/disk2 failed, Permission denied: Permission denied

the following succeeds:

$ sudo mount -t udf -o nobrowse /dev/disk2 /tmp

I suspect that DADiskMountWithArguments will have to be called from a privileged helper tool in order to regain this functionality.