When performing a PITR copy of a data cluster, the pg_xlog directory
is generally omitted. As such, when starting the copy up for
replay/recovery, the WAL directories need to be recreated. This patch
checks to see whether XLOGDIR and XLOGDIR/archive_status exist on
XLOGStartup and if not, recreates them.
--
Jonah H. Harris, Senior DBA
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