Following an upgrade to Mercurial 1.6, hgwebdir.cgi got merged into hgweb.cgi. We overlooked that bit and the apache integration broke. As of now, it is functional again.
We promptly switched to hgweb.cgi but against what the documentation advertised, it was not a complete drop in replacement and would fail to execute no matter what. We fixed it by hosting it through mod_wsgi for apache.
Mercurial Repository Services are now fully functional again.
