We have a use case where we would like to pipe (compressed/encrypted) data to xrdcopy without going via a local temp file first. While "xrdcopy" can pipe out to STDOUT, it apparently does not support reading from STDIN - could this be changed? (of course, things such as transfer checksumming or preallocating on the receiver won't work).

Tests done:

• cat /etc/group | xrdcopy -d 2 - root://eospps//eos/pps/users/iven/test-stdin => gives an empty file on the destination, no error.
• cat /etc/group | xrdcopy -d 2 /dev/stdin root://eospps//eos/pps/users/iven/test-dev-stdin xrdcopy: Operation not supported processing /dev/stdin
• cat /etc/group | xrdcp -d 2 - root://eospps//eos/pps/users/iven/test-stdin-xrdcp xrdcp: Using stdin as a source is disallowed.
• cat /etc/group | xrdcp -d 2 /dev/stdin root://eospps//eos/pps/users/iven/test-dev-stdin-xrdcp xrdcp: Operation not supported processing /dev/stdin

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