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If the PAGER environment variable is set but contains an empty string, psql would pass it to "sh" which would silently exit, causing whatever query output we were printing to vanish entirely. This is quite mystifying; it took a long time for us to figure out that this was the cause of Joseph Brenner's trouble report. Rather than allowing that to happen, we should treat this as another way to specify "no pager". (We could alternatively treat it as selecting the default pager, but it seems more likely that the former is what the user meant to achieve by setting PAGER this way.) Nonempty, but all-white-space, PAGER values have the same behavior, and it's pretty easy to test for that, so let's handle that case the same way. Most other cases of faulty PAGER values will result in the shell printing some kind of complaint to stderr, which should be enough to diagnose the problem, so we don't need to work harder than this. (Note that there's been an intentional decision not to be very chatty about apparent failure returns from the pager process, since that may happen if, eg, the user quits the pager with control-C or some such. I'd just as soon not start splitting hairs about which exit codes might merit making our own report.) libpq's old PQprint() function was already on board with ignoring empty PAGER values, but for consistency, make it ignore all-white-space values as well. It's been like this a long time, so back-patch to all supported branches. Discussion: https://postgr.es/m/CAFfgvXWLOE2novHzYjmQK8-J6TmHz42G8f3X0SORM44+stUGmw@mail.gmail.com |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.