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Contribution guide

Most changes do not require special tools other than the standard build instructions, however, if you modify any of the protobuf files, you'll need to install the protobuf compiler:

$ dnf install protobuf-devel

Then run go generate ./... to regenerate the built files.

repoSpanner has an optional inbuilt profiler that can be enabled at compile time. If you wish to use it, compile repoSpanner with the prof tag, like this:

$ ./ -tags prof

When repoSpanner starts, it will print a log message telling you how you can access the profiling data, for example:


You can use pprof to interpret the data:

go tool pprof


The project comes with a decent functional test suite. Explore the repospanner/functional_tests to see the variety of tests that you can run.

To run the full test suite, run from the main directory:

$ go test ./...

The devel folder

The devel folder contains some scripts that you can use to aid in development of repoSpanner. The script uses podman to build a container that can be used to run the test suite. is used to run the tests in the container that results from running


Contributions are most welcome. To send a patch, send a pull request to the project on github. Please make sure to add a Signed-Off-By line in your git commit to indicate you agree to the Developer Certificate of Origin (DCO) as quoted below. To do this, simple add the "-s" flag to your git commit, like: git commit -s.

Developer Certificate of Origin

Developer Certificate of Origin Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors. 1 Letterman Drive Suite D4700 San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or

(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or

(c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.

(d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.

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