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107 lines
4.6 KiB
Markdown
107 lines
4.6 KiB
Markdown
---
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title: Sparo profiles
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---
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Git's sparse checkout feature normally relies on a collection of glob patterns that are stored in the `.git/info/sparse-checkout` config file. Normal glob syntax proved to be too inefficient, so Git instead uses ["cone mode"](https://git-scm.com/docs/git-sparse-checkout#_internalsnon_cone_problems) that ignores file-matching patterns and only matches directories.
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The syntax looks something like this:
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**.git/info/sparse-checkout example**
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```
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/*
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!/*/
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/apps/
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!/apps/*/
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/apps/my-app/
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!/apps/my-app/*/
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/apps/my-app/_/
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```
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To simplify management, the `git sparse-checkout` command line provides convenient ways to add/remove patterns from this file. However, in a large monorepo with hundreds of projects, managing these globs can be confusing and error-prone.
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Sparo's approach is to generate the `.git/info/sparse-checkout` configuration from config files called profiles. This provides many benefits:
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- Profiles are specified using [project selectors](https://rushjs.io/pages/developer/selecting_subsets/#--to), for example: _"Give me **app1**, **app2**, and all the projects needed to build them."_ This is more concise and maintainable than specifying globs.
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- Profiles are stored in a config file and committed to Git. This makes it easy to share them with your teammates.
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- Profiles are automatically updated when switching between branches, which ensures deterministic results. For example, when checking out a very old branch, you want the old profile definition, not today's version of it.
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- You combine multiple profiles at the same time (`sparo checkout --profile team1 --profile team2`), which produces the union of their subsets. This is useful for example when modifying a library project that is consumed by projects belonging to several other teams. You could instead use a selector `--from the-library` of course, but it's likely those other teams have included other relevant projects in their profiles.
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- Sparo avoids common mistakes by imposing additional restrictions beyond `git sparse-checkout`.
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## Best practices for profiles
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You an add JSON comments to your profile config files. In a large shared codebase, we recommend adding a standardized header to the top of your files indicating their ownership and purpose. Something like this:
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**common/sparo-profiles/example-profile.json**
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```js
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/**
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* OWNER: Customer service team
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* PURPOSE: Use this profile when working on the customer service apps.
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*/
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{
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"$schema": "https://tiktok.github.io/sparo/schemas/sparo-profile.schema.json",
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/**
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* A list of Rush project selectors indicating the project folders to be
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* included for sparse checkout. The selectors will be combined to make
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* the union superset of projects. See the Rush selector docs for details:
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* https://rushjs.io/pages/developer/selecting_subsets/
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*/
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"selections": [
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{
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"selector": "--to",
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"argument": "tag:cs-dashboard"
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},
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{
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"selector": "--to",
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"argument": "tag:cs-tools"
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}
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]
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}
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```
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## Combining profiles
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The simple way to combine profiles is to specify `--profile` multiple times. For example:
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```shell
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# Check out the union of profiles team-a.json, team-b.json, team-c.json
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# NOTE: This will replace whatever profile selection was already checked out.
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sparo checkout --profile team-a --profile team-b --profile team-c
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```
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You can also use `--add-profile` to incrementally combine them. For example:
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```shell
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# These three commands are equivalent to the above command.
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sparo checkout --profile team-a
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sparo checkout --add-profile team-b
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sparo checkout --add-profile team-c
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```
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How to checkout NO profile? In other words, returning to the [skeleton](../reference/skeleton_folders.md) state of a clean `sparo clone`? It can't be `sparo checkout`, because if `--profile` is entirely omitted then the existing profile selection is preserved.
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```shell
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# NOT IMPLEMENTED YET - check out just the skeleton folders
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# without applying any profiles
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sparo checkout --no-profile
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```
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## Querying profiles
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Engineers can find available profiles in the current branch by invoking the [sparo list-profiles](../commands/sparo_list-profiles) command. The `--project` parameter enables you to query relevant profiles for a given project. For example:
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```shell
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# Suppose you need to make a fix for the "example-app" project.
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# Which sparse checkout profiles include the "example-app" project?
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sparo list-profiles --project example-app
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# Great, let's add the "example-profile" result to our current checkout
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# (combining it with the existing profile).
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sparo checkout --add-profile example-profile
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```
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