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0278d3f79a
When pg_basebackup -R is used, we inject standby.signal into the tar file for the main tablespace. The proper thing to do is to pad each file injected into the tar file out to a 512-byte boundary by appending nulls, but here the file is of length 0 and we add 511 zero bytes. Since 0 is already a multiple of 512, we should not add any zero bytes. Do that instead. Patch by me, reviewed by Tom Lane. Discussion: http://postgr.es/m/CA+TgmobWbfReO9-XFk8urR1K4wTNwqoHx_v56t7=T8KaiEoKNw@mail.gmail.com