Feedback-ID: ia2694551:Fastmail
Date: Fri, 15 Jul 2022 14:03:11 +0200
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Cc: dilipbalaut@gmail.com, robertmhaas@gmail.com, michael@paquier.xyz,
	rjuju123@gmail.com, pgsql-hackers@postgresql.org
Subject: Re: standby recovery fails (tablespace related) (tentative patch and
 discussion)
Message-ID: <20220715120311.3z6g2nqqdtiurlbp@alvherre.pgsql>
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On 2022-Jul-15, Alvaro Herrera wrote:

> However, looking closer I noticed that on Windows we use our own
> readdir() implementation, which AFAICT includes everything to handle
> reparse points as symlinks correctly in get_dirent_type.  Which means
> that do_pg_start_backup is wasting its time with the "#ifdef WIN32" bits
> to handle junction points separately.  We could just do this
> 
> diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
> index b809a2152c..4966213fde 100644
> --- a/src/backend/access/transam/xlog.c
> +++ b/src/backend/access/transam/xlog.c
> @@ -8302,13 +8302,8 @@ do_pg_backup_start(const char *backupidstr, bool fast, TimeLineID *starttli_p,
>  			 * we sometimes use allow_in_place_tablespaces to create
>  			 * directories directly under pg_tblspc, which would fail below.
>  			 */
> -#ifdef WIN32
> -			if (!pgwin32_is_junction(fullpath))
> -				continue;
> -#else
>  			if (get_dirent_type(fullpath, de, false, ERROR) != PGFILETYPE_LNK)
>  				continue;
> -#endif
>  
>  #if defined(HAVE_READLINK) || defined(WIN32)
>  			rllen = readlink(fullpath, linkpath, sizeof(linkpath));
> 
> And everything should continue to work.

Hmm, but it does not:
https://cirrus-ci.com/build/4824963784900608

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/