Re: proposal: psql: show current user in prompt - Mailing list pgsql-hackers

From Pavel Stehule
Subject Re: proposal: psql: show current user in prompt
Date
Msg-id CAFj8pRAzUd+JKDP7isokYZapbvSuXmsh8FaE1qF+Hh8DguRDPg@mail.gmail.com
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In response to Re: proposal: psql: show current user in prompt  (Corey Huinker <corey.huinker@gmail.com>)
Responses Re: proposal: psql: show current user in prompt
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pá 3. 2. 2023 v 20:42 odesílatel Corey Huinker <corey.huinker@gmail.com> napsal:


On Fri, Feb 3, 2023 at 9:56 AM Pavel Stehule <pavel.stehule@gmail.com> wrote:
Hi

one visitor of p2d2 (Prague PostgreSQL Developer Day) asked if it is possible to show the current role in psql's prompt. I think it is not possible, but fortunately (with some limits) almost all necessary work is done, and the patch is short.

In the assigned patch I implemented a new prompt placeholder %N, that shows the current role name.

(2023-02-03 15:52:28) postgres=# \set PROMPT1 '%n as %N at '%/%=%#
pavel as pavel at postgres=#set role to admin;
SET
pavel as admin at postgres=>set role to default;
SET
pavel as pavel at postgres=#

Comments, notes are welcome.

Regards

Pavel

This patch is cluttered with the BACKEND_PID patch and some guc_tables.c stuff that I don't think is related.

I was little bit lazy, I am sorry. I did it in one my experimental branch. Both patches are PoC, and there are not documentation yet. I will separate it.


We'd have to document the %N.

I think there is some value here for people who have to connect as several different users (tech support), and need a reminder-at-a-glance whether they are operating in the desired role. It may be helpful in audit documentation as well.

 yes, I agree so it can be useful - it is not my idea - and it is maybe partially deduced from some other databases.

Both patches are very simple - and they use almost already prepared infrastructure.

Regards

Pavel

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