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Osm2pgsql contribution guidelines

Workflow

We operate the "Fork & Pull" model explained at

https://help.github.com/articles/using-pull-requests

You should fork the project into your own repo, create a topic branch there and then make one or more pull requests back to the openstreetmap repository. Your pull requests will then be reviewed and discussed.

History

To understand the osm2pgsql code, it helps to know some history on it. Osm2pgsql was written in C in 2007 as a port of an older Python utility. In 2014 it was ported to C++ by MapQuest and the last C version was released as 0.86.0. In it's time, it has had varying contribution activity, including times with no maintainer or active developers.

Parts of the codebase still clearly show their C origin and could use rewriting in modern C++, making use of data structures in the standard library.

Versioning

Osm2pgsql uses a X.Y.Z version number, where Y tells you if you are on a stable or development series. Like the Linux Kernel, even numbers are stable and development versions are odd.

Bugs and known issues are fixed on the main branch only. Exceptions may be made for easy bug fixes, or if a patch backporting a fix is provided.

Code style

The current codebase is a mix of styles, but new code should be written in the K&R 1TBS style with 4 spaces indentation. Tabs should never be used in the C++ code.

e.g.

int main(int argc, char *argv[])
{
    ...
    while (x == y) {
        something();
        somethingelse();

        if (some_error) {
            do_correct();
        } else {
            continue_as_usual();
        }
    }

    finalthing();
    ...
}

Names should use underscores, not camel case, with class/struct names ending in _t.

Documentation

User documentation is stored in docs/. Pages on the OpenStreetMap wiki are known to be unreliable and outdated.

There is some documentation in Doxygen-formatted comments. The documentation can be generated with doxygen docs/Doxyfile. It is not yet hooked into the build scripts as most functions are not yet documented.

Platforms targeted

Ideally osm2pgsql should compile on Linux, OS X, FreeBSD and Windows. It is actively tested on Debian, Ubuntu and FreeBSD by the maintainers.

Testing

The code also comes with a suite of tests which can be run by executing make check.

Most of these tests depend on being able to set up a database and run osm2pgsql against it. You need to ensure that PostgreSQL is running and that your user is a superuser of that system. To do that, run:

sudo -u postgres createuser -s $USER
sudo mkdir -p /tmp/psql-tablespace
sudo chown postgres.postgres /tmp/psql-tablespace
psql -c "CREATE TABLESPACE tablespacetest LOCATION '/tmp/psql-tablespace'" postgres

Once this is all set up, all the tests should run (no SKIPs), and pass (no FAILs). If you encounter a failure, you can find more information by looking in the test-suite.log. If you find something which seems to be a bug, please check to see if it is a known issue at https://github.com/openstreetmap/osm2pgsql/issues and, if it's not already known, report it there.

If running the tests in a virtual machine, allocate sufficient disk space for a 20GB flat nodes file.

Performance Testing

If performance testing with a full planet import is required, indicate what needs testing in a pull request.

Maintainers

The current maintainers of osm2pgsql are Sarah Hoffmann and Paul Norman. Sarah has more experience with the gazetteer backend and Paul with the pgsql and multi backends.