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From: whiteman808 <whiteman808@paraboletancza.org>
Subject: [gentoo-user] Shared distfiles directory between different virtual machines
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Hi,

Let's say I have a shared by NFS /var/cache/distfiles directory between 
miscellaneous Gentoo VMs whose purpose is to build binaries for 
different machines.

How can I prevent portage from overwriting the same source files in the 
distfiles directory and possible checksum mismatches caused by that 
behavior if I tell emerge to update @world simultaneously on these 
different binary package servers?

Thank you,
whiteman808