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aufs kernel module creates whiteout files on upper layer delete (and other situations) and those files already are 'translated' regarding ownership in host terms (e.g. they are already "0:0" owned), so when these layers are copied around with pkg/archive we don't want to try and translate these files regarding ownership. Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)
This code provides helper functions for dealing with archive files.