Re: improving user.c error messages

On 26.01.23 01:22, Nathan Bossart wrote:
> Here is an early draft of some modest improvements to the user.c error
> messages.  I basically just tried to standardize the style of and add
> context to the existing error messages.  I used errhint() for this extra
> context, but errdetail() would work, too.  This isn't perfect.  You might
> still have to go through a couple rounds of errors before your role has all
> the privileges it needs for a command, but this seems to improve matters a
> little.
> 
> I think there is still a lot of room for improvement, but I wanted to at
> least get the discussion started before I went too far.

This is good.  If I may assign some more work ;-), we have a bunch of 
error messages like

errmsg("must be superuser or a role with privileges of the 
pg_write_server_files role to create backup stored on server")

errmsg("must be superuser or have privileges of the 
pg_execute_server_program role to COPY to or from an external program")

errmsg("must be superuser or have privileges of pg_read_all_settings to 
examine \"%s\"", ...)

which could also be split up into a pair of

errmsg("permission denied to xxx")
errdetail("You must be superuser or ...")