131 lines
4.7 KiB
Markdown
131 lines
4.7 KiB
Markdown
# How to use CircleCI multi-file config
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This README and the Makefile should be in your `.circleci` directory,
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in the root of your repository.
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All path references in this README assume we are in this `.circleci` directory.
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The `Makefile` in this directory generates `./config.yml` in CircleCI 2.0 syntax,
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from the tree rooted at `./config/`, which contains files in CircleCI 2.0 or 2.1 syntax.
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## Quickstart
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The basic workflow is:
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- Edit source files in `./config/`
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- When you are done, run `make ci-config` to update `./config.yml`
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- Commit this entire `.circleci` directory, including that generated file together.
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- Run `make ci-verify` to ensure the current `./config.yml` is up to date with the source.
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When merging this `.circleci` directory:
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- Do not merge the generated `./config.yml` file, instead:
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- Merge the source files under `./config/`, and then
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- Run `make ci-config` to re-generate the merged `./config.yml`
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And that's it, for more detail, read on!
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## How does it work, roughly?
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CircleCI supports [generating a single config file from many],
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using the `$ circleci config pack` command.
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It also supports [expanding 2.1 syntax to 2.0 syntax]
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using the `$ circleci config process` command.
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We use these two commands, stitched together using the `Makefile`
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to implement the workflow.
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[generating a single config file from many]: https://circleci.com/docs/2.0/local-cli/#packing-a-config
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[expanding 2.1 syntax to 2.0 syntax]: https://circleci.com/docs/2.0/local-cli/#processing-a-config
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## Prerequisites
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You will need the [CircleCI CLI tool] installed and working,
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at least version `0.1.5607`.
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You can [download this tool directly from GitHub Releases].
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```
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$ circleci version
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0.1.5607+f705856
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```
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[CircleCI CLI tool]: https://circleci.com/docs/2.0/local-cli/
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[download this tool directly from GitHub Releases]: https://github.com/CircleCI-Public/circleci-cli/releases
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## Updating the config source
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Before making changes, be sure to understand the layout
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of the `./config/` file tree, as well as circleci 2.1 syntax.
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See the [Syntax and layout] section below.
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To update the config, you should edit, add or remove files
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in the `./config/` directory,
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and then run `make ci-config`.
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If that's successful,
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you should then commit every `*.yml` file in the tree rooted in this directory.
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That is: you should commit both the source under `./config/`
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and the generated file `./config.yml` at the same time, in the same commit.
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The included git pre-commit hook will help with this.
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Do not edit the `./config.yml` file directly, as you will lose your changes
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next time `make ci-config` is run.
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[Syntax and layout]: #syntax-and-layout
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### Verifying `./config.yml`
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To check whether or not the current `./config.yml` is up to date with the source
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and valid, run `$ make ci-verify`.
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Note that `$ make ci-verify` should be run in CI,
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in case not everyone has the git pre-commit hook set up correctly.
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#### Example shell session
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```sh
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$ make ci-config
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config.yml updated
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$ git add -A . # The -A makes sure to include deletions/renames etc.
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$ git commit -m "ci: blah blah blah"
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Changes detected in .circleci/, running 'make -C .circleci ci-verify'
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--> Generated config.yml is up to date!
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--> Config file at config.yml is valid.
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```
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### Syntax and layout
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It is important to understand the layout of the config directory.
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Read the documentation on [packing a config] for a full understanding
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of how multiple YAML files are merged by the circleci CLI tool.
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[packing a config]: https://circleci.com/docs/2.0/local-cli/#packing-a-config
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Here is an example file tree (with comments added afterwards):
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```sh
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$ tree .
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.
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├── Makefile
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├── README.md # This file.
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├── config # The source code for config.yml is rooted here.
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│ ├── @config.yml # Files beginning with @ are treated specially by `circleci config pack`
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│ ├── commands # Subdirectories of config become top-level keys.
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│ │ └── go_test.yml # Filenames (minus .yml) become top-level keys under
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│ │ └── go_build.yml # their parent (in this case "commands").
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│ │ # The contents of go_test.yml therefore are placed at: .commands.go_test:
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│ └── jobs # jobs also becomes a top-level key under config...
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│ ├── build.yml # ...and likewise filenames become keys under their parent.
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│ └── test.yml
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└── config.yml # The generated file in 2.0 syntax.
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```
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About those `@` files... Preceding a filename with `@`
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indicates to `$ circleci config pack` that the contents of this YAML file
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should be at the top-level, rather than underneath a key named after their filename.
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This naming convention is unfortunate as it breaks autocompletion in bash,
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but there we go.
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