| def _impl(repository_ctx): |
| # Link cxx repository into @third-party. |
| lockfile = repository_ctx.path(repository_ctx.attr.lockfile) |
| workspace = lockfile.dirname.dirname |
| repository_ctx.symlink(workspace, "workspace") |
| |
| # Copy third-party/Cargo.lock since those are the crate versions that the |
| # BUILD file is written against. |
| vendor_lockfile = repository_ctx.path("workspace/third-party/Cargo.lock") |
| root_lockfile = repository_ctx.path("workspace/Cargo.lock") |
| _copy_file(repository_ctx, src = vendor_lockfile, dst = root_lockfile) |
| |
| # Execute cargo vendor. |
| cmd = ["cargo", "vendor", "--versioned-dirs", "third-party/vendor"] |
| result = repository_ctx.execute( |
| cmd, |
| quiet = True, |
| working_directory = "workspace", |
| ) |
| _log_cargo_vendor(repository_ctx, result) |
| if result.return_code != 0: |
| fail("failed to execute `{}`".format(" ".join(cmd))) |
| |
| # Copy lockfile back to third-party/Cargo.lock to reflect any modification |
| # performed by Cargo. |
| _copy_file(repository_ctx, src = root_lockfile, dst = vendor_lockfile) |
| |
| # Produce a token for third_party_glob to depend on so that the necessary |
| # sequencing is visible to Bazel. |
| repository_ctx.file("BUILD", executable = False) |
| repository_ctx.file("vendor.bzl", "vendored = True", executable = False) |
| |
| def _copy_file(repository_ctx, *, src, dst): |
| content = repository_ctx.read(src) |
| if not dst.exists or content != repository_ctx.read(dst): |
| repository_ctx.file(dst, content = content, executable = False) |
| |
| def _log_cargo_vendor(repository_ctx, result): |
| relevant = "" |
| for line in result.stderr.splitlines(True): |
| if line.strip() and not line.startswith("To use vendored sources,"): |
| relevant += line |
| if relevant: |
| # Render it as command output. |
| # If we just use print(), Bazel will cache and repeat the output even |
| # when not rerunning the command. |
| print = ["echo", relevant] |
| repository_ctx.execute(print, quiet = False) |
| |
| vendor = repository_rule( |
| attrs = {"lockfile": attr.label()}, |
| local = True, |
| implementation = _impl, |
| ) |