I've only seen this questionnaire posted inside GitHub issues, so if you want me to create a separate issue instead of keeping it inside discussions, let me know!

New package manager questionnaire

Did you read our documentation on adding a package manager?

• I've read the adding a package manager documentation.

Basics

What's the name of the package manager?

Unity3D

What language(s) does this package manager support?

Not really applicable.
Unity supports C#, but this manager only handles which version of the Unity Editor and runtime is associated with a project (similarly to updating Node.js via the nvm provider).

How popular is this package manager?

According to SteamDB

• Over 40.000 games published on Steam are built using Unity (https://steamdb.info/tech/)
• Individual games reach up to 700.000 concurrent players (https://steamdb.info/tech/Engine/Unity/)
• 3.6 billion downloads of software made with Unity per month, according to data.ai and SteamDB combined
• Around 1.3k package version files according to GitHub search

Does this language have other (competing?) package managers?

• Yes (give names).
• No.

What are the big selling points for this package manager?

• Enabling continuous runtime updates for game development

Detecting package files

What kind of package files, and names, does this package manager use?

[^/]ProjectSettings/ProjectVersion.txt

Which fileMatch pattern(s) should Renovate use?

[^/]ProjectSettings/ProjectVersion.txt

Do many users need to extend the fileMatch pattern for custom file names?

• Yes, provide details.
• No.

Is the fileMatch pattern going to get many "false hits" for files that have nothing to do with package management?

Unlikely, given the need for a ProjectSettings directory containing ProjectVersion.txt, both are case-sensitive.

Parsing and Extraction

Can package files have "local" links to each other that need to be resolved?

No.

Package file parsing method

The package files should be:

• Parsed together (in serial).
• Parsed independently.

Which format/syntax does the package file use?

• JSON
• TOML
• YAML
• Custom (explain below)
  • A simple text file (offical Unity repository as reference):

    m_EditorVersion: <version>
    m_EditorVersionWithRevision: <version> (<hash>)
    

How should we parse the package files?

• Off the shelf parser.
• Using regex.
• Custom-parsed line by line.
• Other.

Does the package file have different "types" of dependencies?

• Yes, production and development dependencies.
• No, all dependencies are treated the same.

List all the sources/syntaxes of dependencies that can be extracted

Only the one listed inside Which format/syntax does the package file use?.

Describe which types of dependencies above are supported and which will be implemented in future

Only the one listed inside Which format/syntax does the package file use?.

Versioning

What versioning scheme does the package file(s) use?

A Unity version consists of

• semver
• followed by a letter: denotes a stream ([a]lpha, [b]eta, [f]inal release, etc.)
• followed by a number: a growing index
• optionally followed by a hash, wrapped in parentheses: calculated by Unity internally

Example:

• 2023.2.9f1 (0c9c2e1f4bef)
• 2023.3.0b6

Reference: Official Unity documentation (see headline Unity version numbers)

Does this versioning scheme support range constraints, like ^1.0.0 or 1.x?

• Supports range constraints (for example: ^1.0.0 or 1.x), provide details.
• No.

Lookup

Is a new datasource required?

• Yes, provide details.
• No.

Will users want (or need to) set a custom host or custom registry for Renovate's lookup?

• Yes, provide details.
  • Users might want to opt into specific release streams (alpha, beta, patch, LTS)
• No.

Where can Renovate find the custom host/registry?

• No custom host or registry is needed.
  • There's a fixed list of streams, provided by Unity.
    It is not possible to download Unity binaries from a custom host or registry.
• In the package file(s), provide details.
• In some other file inside the repository, provide details.
• User needs to configure Renovate where to find the information, provide details.

Are there any constraints in the package files that Renovate should use in the lookup procedure?

• Yes, there are constraints on the parent language (for example: supports only Python v3.x), provide details.
• Yes, there are constraints on the parent platform (for example: only supports Linux, Windows, etc.), provide details.
• Yes, some other kind of constraint, provide details.
• No constraints.

Will users need the ability to configure language or other constraints using Renovate config?

• Yes, provide details.
• No.

Artifacts

Does the package manager use a lock file or checksum file?

• Yes, uses lock file.
• Yes, uses checksum file.
• Yes, uses lock file and checksum file.
• No lock file or checksum.
  • Uses a hash in the version string, but not in a separate file; the contents and meaning of the hash are also opaque to end-users.

Is the locksum or checksum mandatory?

• Yes, locksum is mandatory.
• Yes, checksum is mandatory.
  • While there have yet to be two releases using the same version number but a different hash, the hash is required by the Unity Hub.
    The Unity Hub manages projects and installed versions of the Unity Editor on a developers system, similar to nvm for Node.js runtimes.
• Yes, lock file and checksum are mandatory.
• No mandatory locksum or checksum.
• Package manager does not use locksums or checksums.

If lockfiles or checksums are used: what tool and exact commands should Renovate use to update one (or more) package versions in a dependency file?

The hash is pre-determined by Unity and can be fetched at the same time as available versions.

Package manager cache

Does the package manager use a cache?

• Yes, provide details.
• No.

If the package manager uses a cache, how can Renovate control the cache?

• Package manager does not use a cache.
• Controlled via command line interface, provide details.
• Controlled via environment variables, provide details.

Should Renovate keep a cache?

• Yes, ignore/disable the cache.
• No.

Generating a lockfile from scratch

Renovate can perform "lock file maintenance" by getting the package manager to generate a lockfile from scratch.
Can the package manager generate a lockfile from scratch?

• Yes, explain which command Renovate should use to generate the lockfile.
• No, the package manager does not generate a lockfile from scratch.
• No, the package manager does not use lockfiles.

Other

What else should we know about this package manager?

This manager, is aimed at updating the Unity Editor itself, not the packages inside a game project.

Packages inside Unity projects might already be updatable by Renovate, using the npm provider (see #19300), but I've personally not yet used it.