lohr/README.org

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#+title: lohr
=lohr= is a Git mirroring tool.
I created it to solve a simple problem I had: I host my own git server at
[[https://git.alarsyo.net]], but want to mirror my public projects to GitHub /
GitLab, for backup and visibility purposes.
GitLab has a mirroring setting, but it doesn't allow for multiple mirrors, as
far as I know. I also wanted my instance to be the single source of truth.
** How it works
Gitea is setup to send webhooks to my =lohr= server on every push update. When
=lohr= receives a push, it clones the concerned repository, or updates it if
already cloned. Then it pushes the update to *all remotes listed* in the [[file:.lohr][.lohr]]
file at the repo root.
*** Destructive
This is a very destructive process: anything removed from the single source of
truth is effectively removed from any mirror as well.
** Setup
*** Quickstart
Setting up =lohr= should be quite simple:
1. Create a =Rocket.toml= file and [[https://rocket.rs/v0.4/guide/configuration/][add your configuration]].
2. Run =lohr=:
#+begin_src sh
$ cargo run # or `cargo run --release` for production usage
#+end_src
3. Configure your favorite git server to send a webhook to =lohr='s address on
every push event.
I used [[https://docs.gitea.io/en-us/webhooks/][Gitea's webhooks format]], but I *think* they're similar to GitHub and
GitLab's webhooks, so these should work too! (If they don't, *please* file an
issue!)
4. Add a =.lohr= file containing the remotes you want to mirror this repo to:
#+begin_example
git@github.com:you/your_repo
#+end_example
and push it. That's it! =lohr= is mirroring your repo now.
*** Configuration
**** Home directory
=lohr= needs a place to clone repos and store its data. By default, it's the
current directory, but you can set the =LOHR_HOME= environment variable to
customize it.
**** Extra remote configuration
=lohr= looks for a =lohr-config.yaml= file in its =LOHR_HOME= directory. This
file takes the following format:
#+begin_src yaml
default_remotes:
- "git@github:user"
- "git@gitlab:user"
additional_remotes:
- "git@git.sr.ht:~user"
#+end_src
- ~default_remotes~ is a list of remotes to use if no ~.lohr~ file is found in a
repository.
- ~additional_remotes~ is a list of remotes to add in any case, whether the
original set of remotes is set via ~default_remotes~ or via a =.lohr= file.
Both settings take as input a list of "stems", i.e. incomplete remote addresses,
to which the repo's name will be appended (so for example, if my
~default_remotes~ contains ~git@github.com:alarsyo~, and a push event webhook
is received for repository =git@gitlab.com:some/long/path/repo_name=, then the
mirror destination will be =git@github.com:alarsyo/repo_name=.
** Contributing
I accept patches anywhere! Feel free to [[https://github.com/alarsyo/lohr/pulls][open a GitHub Pull Request]], [[https://gitlab.com/alarsyo/lohr/-/merge_requests][a GitLab
Merge Request]], or [[https://lists.sr.ht/~alarsyo/lohr-dev][send me a patch by email]]!
** Why lohr?
I was looking for a cool name, and thought about the Magic Mirror in Snow White.
Some *[[https://en.wikipedia.org/wiki/Magic_Mirror_(Snow_White)][furious wikipedia searching]]* later, I found that the Magic Mirror was
probably inspired by [[http://spessartmuseum.de/seiten/schneewittchen_engl.html][the Talking Mirror in Lohr am Main]]. That's it, that's the
story.
** License
=lohr= is distributed under the terms of both the MIT license and the Apache
License (Version 2.0).
See [[file:LICENSE-APACHE][LICENSE-APACHE]] and [[file:LICENSE-MIT][LICENSE-MIT]] for details.