[arch-general] Updating multiple Arch OS's at once

[Mark Lee]

Salutations,

I wrote a script to update some USB OS's of mine per instance. The idea's that 
multiple instances can be run. The script is located at :
<https://github.com/bluerider/mkportarch/blob/master/update-usb>
However, I get the following error : 

------------
:: Synchronizing package databases...
error: failed to update core (unable to lock database)
error: failed to update extra (unable to lock database)
error: failed to update community (unable to lock database)
error: failed to synchronize any databases
error: failed to init transaction (unable to lock database)
error: could not lock database: File exists
  if you're sure a package manager is not already
  running, you can remove /var/lib/pacman/db.lck
------------

Those are separate chroot environments so they wouldn't  be sharing 
/var/lib/pacman/db.lck.

Regards,
Mark
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