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PermanentDetour is a small HTTP server which is was written by Carleton University Library to redirect users of our Sierra catalogue to our new Primo instance. It is hoped that this service will help with the transition to the new LMS/Discovery system by minimizing the number of broken links. The move to the Ex Libris hosted LMS is part of the wider Collaborate Futures project by our consortia OCUL.

PermanentDetour is written in Go, and is deployed as a single binary. A sample systemd unit file can be found in this wiki. It is HTTP only, and designed to be be deployed behind Nginx, Apache, or Haproxy for HTTPS termination.

On startup, the server reads IDMappings CSV files provided by Ex Libris during migration. It uses the data in those files to create redirects from permalinks to the catalogue to Primo. It also has limited support for creating redirects for other types of links, like those to the login page and searches.