Fix packer error: couldn't find Parallels Tools for ... flavor after upgrading Parallels

fix_packer_parallel

# After upgrading Parallels Desktop, often, this command (used by the packer parallels driver):
#   mdfind kMDItemCFBundleIdentifier == com.parallels.desktop.console
# will return not only one path, but a list of the old one(s) and the one:
#  /opt/homebrew-cask/Caskroom/parallels-desktop/11.0.2-31348/Parallels Desktop.app
#  /opt/homebrew-cask/Caskroom/parallels-desktop/11.1.0-32202/Parallels Desktop.app
#
# Maybe one day the packer team will fix their code and use only the highest version in that list,
# Until then we have to fix the list by ourselves:

mdfind kMDItemCFBundleIdentifier == com.parallels.desktop.console

# if you get a list of more than one entry, remove the older versions:
sudo rm -rf xxx
# Where xxx is an old version

# then you might have to fix the soft links in /usr/local/bin, if so:
for f in $(\ls -1 prl*); do
  rm -f $f
  ln -s "$(mdfind kMDItemCFBundleIdentifier == com.parallels.desktop.console)/Contents/MacOS/parallels_wrapper" $f
done

# When all done, mdfind should return only one line and packer will be happy.