Horton

pg_tablespace_location() failure with allow_in_place_tablespaces

Michael Paquier <michael@paquier.xyz>

View thread View on postgr.es
From: Michael Paquier <michael@paquier.xyz>
To: Postgres hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-03-04T06:44:22Z
Lists: pgsql-hackers

Attachments

Hi all,

While playing with tablespaces and recovery in a TAP test, I have
noticed that retrieving the location of a tablespace created with
allow_in_place_tablespaces enabled fails in pg_tablespace_location(),
because readlink() sees a directory in this case.

The use may be limited to any automated testing and
allow_in_place_tablespaces is a developer GUC, still it seems to me
that there is an argument to allow the case rather than tweak any
tests to hardcode a path with the tablespace OID.  And any other code
paths are able to handle such tablespaces, be they in recovery or in
tablespace create/drop.

A junction point is a directory on WIN32 as far as I recall, but
pgreadlink() is here to ensure that we get the correct path on
a source found as pgwin32_is_junction(), so we can rely on that.  This
stuff has led me to the attached.

Thoughts?
--
Michael

Commits

  1. Remove unnecessary Windows-specific basebackup code.

  2. Fix get_dirent_type() for Windows junction points.

  3. doc: Remove mention to in-place tablespaces for pg_tablespace_location()

  4. Fix pg_tablespace_location() with in-place tablespaces

  5. Fix pg_basebackup with in-place tablespaces.