Re: getting "shell command argument contains a newline or carriage return:" error with pg_dumpall when db name have new line in double quote

On 2025-03-26 We 8:52 AM, Srinath Reddy wrote:
> sorry for the noise ,previous response had my editor's formatting,just
> resending without that formatting.
>
> ./psql postgres
>
> Hi,
>
> On Wed, Mar 26, 2025 at 5:55 PM Andrew Dunstan <andrew(at)dunslane(dot)net>
> wrote:
>
> You can still create a database with these using "CREATE DATABASE"
> though. Shouldn't we should really be preventing that?
>
>
> yes, solution 1 which I mentioned prevents these while we are
> using "CREATE DATABASE".
>
> /*
>   * Create a new database using the WAL_LOG strategy.
> @@ -741,6 +742,13 @@ createdb(ParseState *pstate, const CreatedbStmt
> *stmt)
>   CreateDBStrategy dbstrategy = CREATEDB_WAL_LOG;
>   createdb_failure_params fparms;
>
> + /* Report error if dbname have newline or carriage return in name. */
> + if (is_name_contain_lfcr(dbname))
> + ereport(ERROR,
> + (errcode(ERRCODE_INVALID_PARAMETER_VALUE)),
> + errmsg("database name contains a newline or carriage return character"),
> + errhint("newline or carriage return character is not allowed in
> database name"));
> +
>
> psql (18devel)
> Type "help" for help.
>
> postgres=# create database "test
> postgres"# lines";
> ERROR:  database name contains a newline or carriage return character
> HINT:  newline or carriage return character is not allowed in database
> name
>
>

Yes, sorry, I misread the thread. I think we should proceed with options
1 and 3 i.e. prevent creation of new databases with a CR or LF, and have
pgdumpall exit with a more useful error message.

Your invention of an is_name_contain_lfcr() function is unnecessary - we
can just use the standard library function strpbrk() to look for a CR or LF.

cheers

andrew

--
Andrew Dunstan
EDB:https://www.enterprisedb.com