xrdcopy: support reading from STDIN

[jmuf]

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

[ljanyst]

This works fine. Use newer version.

]==> cat /etc/group | xrdcp - root://localhost//tmp/test
[1.149kB/0B][100%][==================================================][0B/s]
]==> md5sum /tmp/test /etc/group
5abb44f8dedb48aed937e44f62dda810  /tmp/test
5abb44f8dedb48aed937e44f62dda810  /etc/group