OS X / hdiutil - acquire mount point on command line

When I was trying to automate the installation of XiphQT, I was struggling to find the mount point after Finder opened the dmg. I found that I could tail -n1 the output of the hdiutil attach my.dmg and use that output:

# move to the location of our dmg file
cd ~/Downloads 

# We need to change the separator for the for loop, 
# (in case mountpoint has whitespace)
IFS=\n 

# mount the dmg, and output the final line of output which looks like:
# /dev/disk2s1         Apple_HFS                       /Volumes/XiphQT 0.1.9
for m in $(hdiutil attach xiph-qt-0.1.9.dmg | tail -n1 ) ; do 

  # set our mount point for future use 
  # (change our FIELD SEPARATOR to tab, in case of whitespace in mountpoint)
  mp=$(echo $m | awk 'BEGIN {FS="\t"}; {print $3}') 

  # set our destination folder
  dest='Library/Components' 

  # create our destination folder
  cd ; mkdir "${dest}" 

  # copy our component into the destination folder
  cp -R ${mp}/XiphQT.component "${dest}" 

  # detach our mountpoint
  hdiutil detach ${mp}; 
done