On 12 August 2016 at 16:34, Christoph Berg <m...@debian.org> wrote:
> > postgres=# COPY x TO '/root/nopermissions';
> > ERROR: could not open file "/root/nopermissions" for writing: Permission
> > denied
> > HINT: Paths for COPY are on the PostgreSQL server, not the client. You
> may
> > want psql's \copy or a driver COPY ... FROM STDIN wrapper
>
> TO STDOUT.
>
Ahem, whoops. It's the simple things sometimes...
Attached amended.
> Also, I vaguely get what you wanted to say with "a driver ...
> wrapper", but it's pretty nonsensical if one doesn't know about the
> protocol details. I don't have a better suggestion now, but I think it
> needs rephrasing.
I don't like it either, but didn't come up with anything better. The
problem is that every driver calls it something different.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
From e713a8a7c5373a137d417d0001b11e296b841f5a Mon Sep 17 00:00:00 2001
From: Craig Ringer <cr...@2ndquadrant.com>
Date: Fri, 12 Aug 2016 15:42:12 +0800
Subject: [PATCH] Emit a HINT when COPY can't find a file
Users often get confused between COPY and \copy and try to use client-side
paths with COPY. The server of course cannot find the file.
Emit a HINT in the most common cases to help users out.
---
src/backend/commands/copy.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index f45b330..c902e8b 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -1761,7 +1761,9 @@ BeginCopyTo(Relation rel,
if (!is_absolute_path(filename))
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
- errmsg("relative path not allowed for COPY to file")));
+ errmsg("relative path not allowed for COPY to file"),
+ errhint("Paths for COPY are on the PostgreSQL server, not the client. "
+ "You may want psql's \\copy or a driver COPY ... TO STDOUT wrapper")));
oumask = umask(S_IWGRP | S_IWOTH);
cstate->copy_file = AllocateFile(cstate->filename, PG_BINARY_W);
@@ -1770,7 +1772,9 @@ BeginCopyTo(Relation rel,
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open file \"%s\" for writing: %m",
- cstate->filename)));
+ cstate->filename),
+ errhint("Paths for COPY are on the PostgreSQL server, not the client. "
+ "You may want psql's \\copy or a driver COPY ... TO STDOUT wrapper")));
if (fstat(fileno(cstate->copy_file), &st))
ereport(ERROR,
@@ -2796,7 +2800,9 @@ BeginCopyFrom(Relation rel,
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open file \"%s\" for reading: %m",
- cstate->filename)));
+ cstate->filename),
+ errhint("Paths for COPY are on the PostgreSQL server, not the client. "
+ "You may want psql's \\copy or a driver COPY ... FROM STDIN wrapper")));
if (fstat(fileno(cstate->copy_file), &st))
ereport(ERROR,
--
2.5.5
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