On 12/29/2017 9:56 AM, Tom Lane wrote:

In https://postgr.es/m/1514541656508-0.p...@n3.nabble.com
it's reported that "SELECT pg_ls_dir('c:')" works to allow
display of the root directory on drive C.  If true, this
would be a violation of the principle that the core file
access functions only let you get at PG-related directories.
However, I looked at the code, and it sure looks like
path_is_relative_and_below_cwd() contains code to reject use
of Windows drive letters.  Am I missing something?  Anyone
want to check if they can reproduce this on a Windows build?

                        regards, tom lane

Could not reproduce with a fresh install.

C:\Program Files\PostgreSQL\10\bin>psql.exe
Password:
psql (10.1)
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
Type "help" for help.

postgres=# select version();
                          version
------------------------------------------------------------
 PostgreSQL 10.1, compiled by Visual C++ build 1800, 64-bit
(1 row)


postgres=# SELECT pg_ls_dir('c:');
ERROR:  path must be in or below the current directory


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