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Fix bogus tar-file padding logic for standby.signal.

When pg_basebackup -R is used, we inject standby.signal into thetar file for the main tablespace. The proper thing to do is to padeach file injected into the tar file out to a 512-byte boundaryby appending nulls, but here the file is of length 0 and we add511 zero bytes. Since 0 is already a multiple of 512, we shouldnot 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

1 parent18f7e85 commita08bfe7Copy full SHA for a08bfe7

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src/bin/pg_basebackup
- pg_basebackup.c

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`‎src/bin/pg_basebackup/pg_basebackup.c‎`

Lines changed: 6 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1131,7 +1131,12 @@ ReceiveTarFile(PGconn conn, PGresult res, int rownum)`
`1131`	`1131`	`time(NULL));`
`1132`	`1132`
`1133`	`1133`	`WRITE_TAR_DATA(header,sizeof(header));`
`1134`		`-WRITE_TAR_DATA(zerobuf,511);`
	`1134`	`+`
	`1135`	`+/*`
	`1136`	`+ * we don't need to pad out to a multiple of the tar block`
	`1137`	`+ * size here, because the file is zero length, which is a`
	`1138`	`+ * multiple of any block size.`
	`1139`	`+ */`
`1135`	`1140`	`}`
`1136`	`1141`	`}`
`1137`	`1142`

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Commita08bfe7

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`‎src/bin/pg_basebackup/pg_basebackup.c‎`

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