location.
This is done to avoid write-on-write race conditions, when two package
builds try to write the same distfile back into the server. To avoid
this, the distfiles are first copied over to
distfiles/.pbtmp/${PKGNAME}, and then a .done file is created in that
directory. This script runs on the server periodically to copy the
files to the central location. Since this script copies one distfile
at a time, the race mentioned above doesn't exist. Also, it will only
copy files from directories where the .done file exists to avoid
read-before-write race conditions.
