This repo contains code for three functions to be loaded into PostgreSQL as a shared library:
1. `maptile_for_point`, which is used only by the `/changes` API call. This API call is little-used and IMHO should be deprecated and removed. However, even now it's hardly on the hot path for most development activities.
2. `tile_for_point`, which is used only in migrations. At this point, it seems unlikely that anyone will be doing a migration on existing data which would call this function (most developers will be running migrations on an empty database, to set it up).
3. `xid_to_int4`, which is only used for replication using Osmosis and isn't used in the Rails code at all. Hopefully this will be replaced Real Soon Now, but until then it's a quite advanced feature that most developers won't need.
Therefore, this patch proposes to replace the above three shared library functions with SQL implementations of the first two. These are _much_ slower - by a factor of about 30x, however this makes no difference when they're run on a completely empty database. In return, we're able to drop a dependency on the PostgreSQL server development package, and clean a few lines out of the installation instructions.
It's still possible to make and install the shared library functions, and I've included instructions about how to do that - although it shouldn't be necessary for the vast majority of `openstreetmap-website` developers.
This uses the sputnik13/trusty64 image rather then the official
ubuntu/trusty64 image in order to get libvirt provider support as
wall as virtualbox provider support.
The script that preprocess keys and tags metadata from the wiki
was filtering redirect pages when looking for wiki pages with the
template `KeyDescription`.
Some wiki pages like `Key:admin_level` currently redirects to others
like `Tag:boundary=administrative`, but even so, they still contain
a `KeyDescription` template so their metadata can be read by other
programs.
The parameter `eifilterredir` was changed and tested. For more
details, see this parameter in the feature `list=embeddedin` from
https://www.mediawiki.org/w/api.php.
Also fix the provisioning script so that it runs correctly when
the VM is upped, regardless of whether it's a clean install or
an 'up' of a previously halted VM.
