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This previously resulted in an error and a nonzero exit status, but after discussion this should rather be a noop with a zero exit status. This is a back-patch of commit 6b34e5563849edc12896bf5754e8fe7b88012697, plus two changes from commit e50cda78404d6400b1326a996a4fabb144871151 that teach pg_rewind to allow the initial control file states to be DB_SHUTDOWNED_IN_RECOVERY as well as DB_SHUTDOWNED. That's necessary to get the additional regression test case to pass, and the old behavior seems like rather a foot-gun anyway. Peter Eisentraut and Tom Lane