turnip
Project description
turnip
turnip is a flexible and scalable Git server suite written in Python using Twisted.
The various servers provide customisable virtual hosting, with flexible authentication and authorisation, and individual horizontal scaling from the frontend to the storage layer.
None of the Python interfaces here should be considered stable.
Architecture
turnip’s architecture is designed to maximise simplicity, scalability and robustness. Each server provides roughly one service, and an installation need only run the servers that it desires. Most servers eschew local state to ease horizontal scaling, and those that do have local state can replicate and/or shard it.
There are two separate server stacks: pack and API. The pack stack communicates with Git clients via the pack protocol (git://), smart HTTP, or smart SSH. The HTTP and SSH frontends unwrap the tunneled pack protocol, and forward it onto the midends as a normal pack protocol connection. The separate HTTP API stack provides a programmatic remote interface to high-level read and write operations on the repositories
- Frontends:
Pack
Smart HTTP
Smart SSH
HTTP API
- Midends:
Pack virtualisation
API virtualisation
- Backends:
Pack
API
Internal protocol
turnip uses an extension of the Git pack protocol for most communication between its servers. The only change is that turnip requests can specify arbitrary named parameters, not just a hostname.
The relevant part of the Git pack protocol’s git-proto-request is represented in ABNF as follows:
git-proto-request = request-command SP pathname NUL [ host-parameter NUL ] host-parameter = "host=" hostname [ ":" port ]
turnip-proto-request alters it to this:
turnip-proto-request = request-command SP pathname NUL \*( param NUL ) param = param-name "=" param-value param-name = \*( %x01-3C / %x3E-FF ) ; exclude NUL and = param-value = \*%x01-FF ; exclude NUL
The only additional parameters implemented today are ‘turnip-stateless-rpc’ and ‘turnip-advertise-refs’, which are used by the smart HTTP server to proxy to the standard pack protocol.
Development
Setup
Create a trusty container (optional):
sudo lxc-create -t ubuntu -n turnip.trusty -- -r trusty -a amd64 -b $USER
Run the following:
sudo add-apt-repository ppa:launchpad/ppa sudo apt-get update cat system-dependencies.txt | sudo xargs apt-get install -y --no-install-recommends
Running
Pack smart-http/ssh services can be started with:
python turnipserver.py
The HTTP API can be started with:
make run-api
Deployment
Turnip is deployed with the turnip juju charm, available from:
git clone https://git.launchpad.net/~canonical-launchpad-branches/charms/+source/turnip
To deploy with the local provider:
juju switch local juju bootstrap juju deploy –repository=/path/to/loca/charm/repo/root local:trusty/turnip
NEWS for turnip
0.1.1 (2015-06-11)
Add a merge detection API.
0.1 (2015-06-02)
Initial release.
Project details
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.