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2d34ad8430
This allows control of the directory in which the postmaster sockets are created for the temporary postmasters started by pg_upgrade. The default location remains the current working directory, which is typically fine, but if it is deeply nested then its pathname might be too long to be a socket name. In passing, clean up some messiness in pg_upgrade's option handling, particularly the confusing and undocumented way that configuration-only datadirs were handled. And fix check_required_directory's substantially under-baked cleanup of directory pathnames. Daniel Gustafsson, reviewed by Hironobu Suzuki, some code cleanup by me Discussion: https://postgr.es/m/E72DD5C3-2268-48A5-A907-ED4B34BEC223@yesql.se