[Bug-tar] sparse file to /dev/null

[Peter Vrabec]

Hi,

is this a bug or not?

$ echo "hello" | dd of=x bs=1 seek=20G
6+0 records in
6+0 records out

$ tar cf x.tar --sparse --totals x
Total bytes written: 10240 (10KiB, 75B/s)

but

$ tar cf /dev/null --sparse --totals x
tar: x: Cannot seek to 0: Bad file descriptor
Total bytes written: 21474846720 (21GiB, 4.1GiB/s)
tar: Error exit delayed from previous errors

Because this bahavior cause some problem for Amanda.