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rules_codeowners

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Bazel rules for generating CODEOWNERS from a workspace.

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# rules_codeowners

Use Bazel to create GitHub CODEOWNERS.

CODEOWNERS on GitHub is flawed in the way that there can only be one CODEOWNERS file.

`rules_codeowners` allows you to define the CODEOWNERS at all levels in the repo, and then generating the final CODEOWNERs file.

## Usage

_See also: [README_DOCS.md](https://github.com/zegl/rules_codeowners/blob/master/README_DOCS.md)_

rules_codeowners is available on the [Bazel Central Registry](https://registry.bazel.build/modules/rules_codeowners):

**Add this to your `MODULE.bazel`:**

```bzl
bazel_dep(name = "rules_codeowners", version = "0.2.1")
```

**... or if you're not using modules, add this to `WORKSPACE`:**

```bzl
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

RULES_CODEOWNERS_VERSION = "de6749190dcc5209427799b1e9777f79ab623702"
RULES_CODEOWNERS_SHA = "9277d41fefe2eded54ab1d3eeaebbef9ad28713291373a635079868980c6ead0"

http_archive(
    name = "rules_codeowners",
    strip_prefix = "rules_codeowners-%s" % RULES_CODEOWNERS_VERSION,
    sha256 = RULES_CODEOWNERS_SHA,
    url = "https://github.com/zegl/rules_codeowners/archive/%s.zip" % RULES_CODEOWNERS_VERSION,
)
```

**In BUILD files:**

```bzl
load("@rules_codeowners//tools:codeowners.bzl", "codeowners", "generate_codeowners")

# Define one or many codeowners, should be added at multiple levels in the repo
codeowners(
    name = "team_rule",

# Set either team or teams to assign the GitHub team ownership
    team = "@org/foo",
    # teams = ["@org/team1", "@org/team2"],

visibility = ["//visibility:public"],

# Optional rules below
    pattern = "*.js", # Adds pattern to the end of the path if this rule label is
                      # //foo/bar:codeowner, this would create an entry for /foo/bar/*.js

patterns = ["*.js", "*.ts"] # Same as pattern, but generates multiple rows, one for each pattern.
                                # Only one of pattern and patterns can be set at the same time.
)

# The generate_codeowners rule ties together multiple codeowners (and generate_codeowners) rules, and
# generates the final CODEOWNERS file.
#
# A generate_codeowners can use another generate_codeowners in the `owners` list,
# to effectively delegate access to modify the CODOWNERS in a part of the code-tree.
generate_codeowners(
    name = "generate_codeowners",
    owners = [
        ":team_rule",
    ],
)
```

The `generate_codeowners` rule (`//:generate_codeowners`), can be built with Bazel to create
the complete CODEOWNERS file, the generated file will be located at `bazel-bin/generate_codeowners.out` by default.

```bash
bazel build //:generate_codeowners
```

## Making sure that the CODEOWNERS is up to date

It's not possible for Bazel to output files to the workspace, but it _is_ possible to compare the current CODEOWNERS
with the generated version, to remind you that it's out of date with a `sh_test`.

```bzl
sh_test(
    name = "validate_codeowoners_up_to_date",
    srcs = ["@rules_codeowners//tools:diff.sh"],
    args = [
        "$(location :generate_codeowners.out)",
        "$(location CODEOWNERS)",
    ],
    data = [
        "CODEOWNERS",
        ":generate_codeowners.out",
    ],
)
```

## Automation tip: Automatically populate the `generate_codeowners`

To automatically set all `codeowners` as owners in a `generate_codeowners`, the following script that utilizes `bazel query` and [`buildozer`](https://github.com/bazelbuild/buildtools/tree/master/buildozer) can be used.

```bash
#!/usr/bin/env bash

# target to the generate_codeowners, eg "//.github:gen_codeowners"
readonly target=$1

readonly BAZEL=$(which bazel)
readonly BUILDOZER=$(which buildozer)

readonly new_owners=$(
    # Query for all codeowners() rules (anchor at the front to avoid match on generate_codeowners rule)
    $BAZEL query --output=label 'kind("^codeowners rule", //...)' |
    # Print the length of each label at the front of the line
    awk '{ print length, $0 }' |
    # Sort shortest-first, so that the root //:OWNERS ends up first in CODEOWNERS
    sort -n -s |
    # 43 label -> "label"
    awk '{ print "\x22" $2 "\x22" }' |
    # comma-separated
    tr '\n' ','
)

readonly command="set owners [${new_owners}]|${target}"

echo "$command" | $BUILDOZER -f -
```

## Automation tip: Verify that all codeowners are transiently depended on a `generate_codeowners`

To verify that all `codeowners` are targeted by a `generate_codeowners`, a script like the one below can be used.

```bash
#!/usr/bin/env bash

# target to the generate_codeowners, eg "//.github:gen_codeowners"
readonly target=$1

readonly TEEFILE=$(mktemp)
readonly BAZEL=$(which bazel)

$BAZEL query "kind(codeowners, //...) except deps(${target})" 2>&1 | tee "$TEEFILE" | grep "Empty results"
EXIT=$?

if [ "$EXIT" -eq 1 ]; then
    cat "$TEEFILE"
    echo "--> All codeowners rules must be depended on by ${target}"
    echo "--> Add the codeowners as a dependency, or delete the target"
    exit 1
fi

exit 0
```

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