# Git Mirror
Git Mirror will watch a GitLab or GitHub groups and keep it in sync with external git repositories.
## Usage
1. Create group on your gitlab instance or gitlab.com. e.g. `mirror-test`
2. Add a repository you like to sync to. e.g `my-project`
3. Add a description to the project in YAML format containing an `origin` field. e.g. `origin: https://git.example.org/my-project.git`
4. Execute set the `PRIVATE_TOKEN` environment variable a personal access token or your private token and execute `git-mirror`
``` sh
export PRIVATE_TOKEN="<personal-access-token>"
git-mirror -g mirror-test
```
This will sync the group `mirror-test` on gitlab.com. If you want to sync a group on a different GitLab instance, use the `-u` flag.
``` sh
git-mirror -g mirror-test -u http://gitlab.example.org
```
### Multiple concurrent jobs
`git-mirror` allows to execute multiple mirror jobs in parallel using the `-c <n>` flag.
``` sh
git-mirror -g mirror-test -c 8
```
This will execute at most 8 sync jobs in parallel
### Description format
For `git-mirror` to mirror a repository it needs to know where to sync from.
In order to achive this `git-mirror` expects the description field of a mirrored project to
be valid [YAML](http://yaml.org/) with at least an `origin` field.
``` yaml
origin: https://git.example.org/my-project.git
```
A list of currently supported fields
- `origin` Source repository to mirror from
- `skip` Temporarily exclude a project from syncing by adding `skip: true`
- `destination` Reserved for future use
- `refspec` Push only refspec.
Add the refspec list to use it. Any valid refspec is possible.
E.g.
```yaml
refspec: ["master", "2.0", "+refs/tags/*:refs/tags/*"]
```
See also https://git-scm.com/book/en/v2/Git-Internals-The-Refspec
Any other fields are ignored
### Mirror to GitHub
`git-mirror` also supports mirroring to GitHub.
This can be done by specifying GitHub as provider:
``` sh
export PRIVATE_TOKEN="<personal-access-token>"
git-mirror -g mirror-test -p GitHub
```
This has been tested against github.com but it might also work with on premise installations of GitHub.
## Docker
There is also a docker image available. It can be used as follows:
```
docker run -e PRIVATE_TOKEN="x" bachp/git-mirror git-mirror -g mirror -u http://gitlab.example.com
```
## Building & Installing
In order to build this project you need a least rust v1.18.0. The easiest way to get rust is via: [rustup.rs](http://rustup.rs/)
The project can be built using cargo
```
cargo build
```
## They're using Git Mirror
* [gitlab-mirror-orchestrator](https://gitlab.ow2.org/ow2/gitlab-mirror-orchestrator) tool at OW2 Consortium.
## License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details