4. Repository Structure

Date: 2023-09-07

Status

Pending

Context

This repository will be a fusion between three existing code bases; Ophyd v2, ophyd-epics-devices and ophyd-tango-devices.

Ophyd Async has been derived from a folder originally kept in the Ophyd repository. Initially the structure of this folder was very simple, however it has since become quite bloated. In the transition to moving the v2/ folder into this repository (ophyd-async), we have decided to structure the library in a more cohesive way, especially as this repository is now going to contain implementation of Ophyd Async devices for EPICS and Tango control systems.

Decision

This repository will be created using the python3-pip-skeleton for the Bluesky organisation.

Then, git-filter-repo to select commits relevant to the following paths in the master branch of the Ophyd repository:

• .git_blame_ignore_revs

• .gitignore

• .mailmap

• .pre-commit-config.yaml

• .codecov.yml

• LICENSE

• other_licenses/

• docs/ (all folders except user_v1)

• . (glob pattern in root directory)

• ophyd/v2

• scripts/

These commits will be merged into the Ophyd Async repository. The same process should apply to ophyd-epics-devices and ophyd-tango-devices, except keeping all git history in these cases.

During this process, the folder structure should incrementally be changed to

ophyd-async
├── docs (skeleton)
├── LICENCE.txt
├── src
│   └── ophyd_async
│       ├── core
│       │   ├── __init__.py
│       │   ├── _device
│       │   │   ├── __init__.py
│       │   │   ├── _backend
│       │   │   │   ├── __init__.py
│       │   │   │   ├── signal_backend.py
│       │   │   │   └── sim.py
│       │   │   ├── _signal
│       │   │   │   ├── __init__.py
│       │   │   │   └── signal.py
│       │   │   ├── device_collector.py
│       │   │   ├── device_vector.py
│       │   │   └── ...
│       │   ├── async_status.py
│       │   └── utils.py
│       ├── epics
│       │   ├── _backend
│       │   │   ├── __init__.py
│       │   │   ├── _p4p.py
│       │   │   └── _aioca.py
│       │   ├── areadetector
│       │   │   ├── __init__.py
│       │   │   ├── ad_driver.py
│       │   │   └── ...
│       │   ├── signal
│       │   │   └── ...
│       │   ├── motion
│       │   │   ├── __init__.py
│       │   │   └── motor.py
│       │   └── demo
│       │       └── ...
│       └── panda
│           └── ...
├── tests
│   ├── core
│   │   └── ...
│   └── epics
└── ...

The __init__.py files of each submodule (core, epics, panda and eventually tango) will be modified such that end users experience little disruption to how they use Ophyd Async. For such users, from ophyd.v2.core import ... can be replaced with from ophyd_async.core import ....

Consequences

The git history of all three repositories being merged will be preserved, and their code bases neatly subdivided.

Merge conflicts dealt with for ophyd-epics-devices and ophyd-tango-devices will be clearly stated in the commit messages regarding their resolutions.