I know the UUID of a volume - as found in Disk Utility.
How can I get additional information on the volume? Most importantly, I want to know its mount point.
Looking at /etc/fstab doesn't do the trick. This does not list the root volume. I would at least need to figure out the UUID of the root volume to verify my known UUID against it.
You can use diskutil to look up the disk by its UUID, and the -plist option to get the output in a machine-parseable format:
% diskutil info /Volumes/RAM\ Disk | grep -F UUID
Volume UUID: EA20BE94-5F3C-3C02-901D-A213B5AB6831
% diskutil info -plist EA20BE94-5F3C-3C02-901D-A213B5AB6831
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<!--snip-->
<key>MountPoint</key>
<string>/Volumes/RAM Disk</string>
<!--snip-->
</dict>
</plist>
You can use NSTask and NSPipe to run diskutil from within your program and capture the output.
Addendum: Not all volumes have UUIDs. My camera has a built-in read-only MS-DOS-formatted volume that has no UUID according to Disk Utility and diskutil. So, make sure your program can handle empty output from the above diskutil info … | grep
pipeline.