From: Andrew Dunstan <andrew@dunslane.net>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Fix readlink() for non-PostgreSQL junction points on Windows.
Date: Sat, 18 Jan 2025 14:34:48 +0000
Message-ID: <E1tZ9uS-002Ewp-O2@gemulon.postgresql.org> (raw)
Fix readlink() for non-PostgreSQL junction points on Windows.
Since commit c5cb8f3b taught stat() to follow symlinks, and since initdb
uses pg_mkdir_p(), and that examines parent directories, our humble
readlink() implementation can now be exposed to junction points not of
PostgreSQL origin. Those might be corrupted by our naive path mangling,
which doesn't really understand NT paths in general.
Simply decline to transform paths that don't look like a drive absolute
path. That means that readlink() returns the NT path directly when
checking a parent directory of PGDATA that happen to point to a drive
using "rooted" format. That works for the purposes of our stat()
emulation.
Reported-by: Roman Zharkov <r.zharkov@postgrespro.ru>
Reviewed-by: Roman Zharkov <r.zharkov@postgrespro.ru>
Discussion: https://postgr.es/m/4590c37927d7b8ee84f9855d83229018%40postgrespro.ru
Discussion: https://postgr.es/m/CA%2BhUKG%2BajSQ_8eu2AogTncOnZ5me2D-Cn66iN_-wZnRjLN%2Bicg%40mail.gmail.com
Backpatched commit f71007fb as above by Thomas Munro into releases 13 thru 15
Discussion: https://postgr.es/m/CA+hUKGLbnv+pe3q1fYOVkLD3pMra7GuihfMxUN-1831YH9RYQg@mail.gmail.com
Branch
------
REL_13_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/2c4a532c96a948e26b25e3260d155c1ec245c2ae
Author: Thomas Munro <tmunro@postgresql.org>
Modified Files
--------------
src/port/dirmod.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-committers@postgresql.org
Cc: andrew@dunslane.net, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Fix readlink() for non-PostgreSQL junction points on Windows.
In-Reply-To: <E1tZ9uS-002Ewp-O2@gemulon.postgresql.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox