Architecture 13 - Galaxy Dependencies Management

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# Architecture 13 - Galaxy Dependencies Management

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		<a href="/training-material/hall-of-fame/jmchilton/" class="contributor-badge contributor-jmchilton"><img src="/training-material/assets/images/orcid.png" alt="orcid logo" width="36" height="36"/><img src="https://avatars.githubusercontent.com/jmchilton?s=36" alt="John Chilton avatar" width="36" class="avatar" />
    John Chilton</a>
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### <i class="far fa-question-circle" aria-hidden="true"></i><span class="visually-hidden">question</span> Questions

- How does Galaxy manage dependencies?

- What is the virtualenv used for?

- Where do JavaScript dependencies come from?

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### <i class="fas fa-bullseye" aria-hidden="true"></i><span class="visually-hidden">objectives</span> Objectives

- Understand Python dependency management

- Understand JavaScript dependency management

- Learn about the wheels server

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# Architecture 13 - Galaxy Dependencies Management

*The architecture of Galaxy's dependencies.*

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### Dependencies - Python

`script/common_startup.sh` sets up a `virtualenv` with required dependencies in `$GALAXY_ROOT/.venv` (or `$GALAXY_VIRTUAL_ENV` if set).

- Check for existing virtual environment, if it doesn't exist check for `virtualenv`.
- If `virtualenv` exists, use it. Otherwise download it as a script and setup a virtual environment using it.
- `. "$GALAXY_VIRTUAL_ENV/bin/activate"`
- Upgrade to latest `pip` to allow use of binary wheels.
- `pip install -r requirements.txt --index-url https://wheels.galaxyproject.org/simple`
- Install dozens of dependencies.

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### Dependencies - JavaScript

- Dependencies are defined in `client/package.json`.
- These are fetched from npm and compiled into bundles as part of `make client` and related `Makefile` targets.

.footnote[Previous: [Galaxy Client Architecture](/training-material/topics/dev/tutorials/architecture-client/slides.html) | Next: [Galaxy Startup Process](/training-material/topics/dev/tutorials/architecture-startup/slides.html)]

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### <i class="fas fa-key" aria-hidden="true"></i><span class="visually-hidden">keypoints</span> Key points

- Python: virtualenv with pip and wheels from galaxyproject.org

- JavaScript: npm/yarn with package.json

- No compilation required by default

- Binary wheels for fast installation

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## Thank You!

This material is the result of a collaborative work. Thanks to the [Galaxy Training Network](https://training.galaxyproject.org) and all the contributors!

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Tutorial Content is licensed under <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.<br/>