rules_github

Bazel repository rules for fetching content from GitHub releases — the common substrate underneath fastverk's rules_mdbook, rules_bun, rules_postgres, and anything else that pulls a sha-pinned prebuilt binary or source tarball from a GitHub release.

Two repository rules:

• github_binary_repository — fetch a per-platform binary release asset (releases/download/<tag>/<asset> URL shape; mdbook, bun, ripgrep, jq, …).
• github_source_repository — fetch a source tarball from a tag (archive/refs/tags/<tag>.tar.gz URL shape; libpg_query and anything else that doesn't ship prebuilt assets but you want to build from source under Bazel).

See docs/repositories.md for the full attribute reference.

Install

Add the registry to your .bazelrc:

common --registry=https://registry.fastverk.com/
common --registry=https://bcr.bazel.build/

In your MODULE.bazel:

bazel_dep(name = "rules_github", version = "0.1.0")

Quick start

Per-platform binary (mdbook-style)

load("@rules_github//github:repositories.bzl", "github_binary_repository")

def _bun_ext_impl(_ctx):
    github_binary_repository(
        name = "bun",
        repo = "oven-sh/bun",
        version = "1.3.14",
        tag_format = "bun-v{version}",
        asset_template = "bun-{platform}.zip",
        strip_prefix_template = "bun-{platform}",
        platform_aliases = {
            "darwin_aarch64": "darwin-aarch64",
            "darwin_x86_64":  "darwin-x64",
            "linux_aarch64":  "linux-aarch64",
            "linux_x86_64":   "linux-x64",
        },
        platform_shas = {
            "darwin_aarch64": "d8b96221828ad6f97ac7ac0ab7e95872341af763001e8803e8267652c2652620",
            "linux_x86_64":   "951ee2aee855f08595aeec6225226a298d3fea83a3dcd6465c09cbccdf7e848f",
            # …
        },
        build_file_content = """
package(default_visibility = ["//visibility:public"])
exports_files(["bun"])
""",
    )

bun_ext = module_extension(implementation = _bun_ext_impl)

Canonical platform identifiers are darwin_aarch64, darwin_x86_64, linux_x86_64, linux_aarch64, windows_x86_64. platform_aliases maps these to whatever the upstream release naming uses (aarch64-apple-darwin for Rust-target convention, darwin-aarch64 for Bun, …).

Source tarball (libpg_query-style)

load("@rules_github//github:repositories.bzl", "github_source_repository")

github_source_repository(
    name = "libpg_query",
    repo = "pganalyze/libpg_query",
    version = "17-6.2.2",
    tag_format = "{version}",         # libpg_query tags don't have a `v` prefix
    sha256 = "e68962c18dbf5890821511be6c5c42261170bf8bfd51a82ea9176069f3d0df8b",
    build_file_content = """
load("@rules_cc//cc:defs.bzl", "cc_library")
# … cc_library wiring …
""",
)

strip_prefix_template defaults to <repo-basename>-<version>, matching GitHub's auto-generated source tarball layout. Override only if upstream's tag-to-tarball-prefix mapping is non-standard.

What's deliberately NOT here

• Toolchain rules. Each downstream rules_* (rules_mdbook, rules_bun, …) defines its own ToolchainInfo provider with project-specific fields. Wrapping the binary as a toolchain stays in the consumer's BUILD overlay.
• Generic-HTTP fetching. Non-GitHub URLs (e.g., ftp.postgresql.org/pub/source/postgresql-17.6.tar.bz2 for the full PG source) need a different URL template. A sibling http_archive_repository could be added later; today, use Bazel's built-in http_archive directly.

Compatibility

• Bazel: 7.4+, bzlmod required.
• Platforms: detection covers darwin × {aarch64, x86_64}, linux × {x86_64, aarch64}, windows × x86_64. Other platforms surface as an explicit fail() — extend github/private/platforms.bzl if needed.

Contributing

Reference docs are stardoc-generated. After editing rule docstrings:

bazel run //docs:update

CI gates this via bazel test //docs/... + buildifier lint.

License

MIT.