SeleniumHQ/selenium · error · RuntimeError

Expected exactly one webref_cddl_extension use_repo block, f

Error message

Expected exactly one webref_cddl_extension use_repo block, found {count}

What it means

Raised by update_module() in scripts/update_cddl.py when the regex substitution for the use_repo(webref_cddl_extension, ...) block in MODULE.bazel does not match exactly once. The regex searches for 'use_repo(\n webref_cddl_extension,\n.*?\n)'. If count != 1, the MODULE.bazel file either lacks this block entirely or has been modified to have zero or multiple matches.

Source

Thrown at scripts/update_cddl.py:197

        f'_BIDI_SPEC_HTML_SHA256 = "{bidi_sha256}"',
        "_BIDI_SPEC_HTML_SHA256 assignment",
    )

    BZL_FILE.write_text(content)


def update_module(repo_names):
    content = MODULE_FILE.read_text()
    repo_list = "\n".join(f'    "{name}",' for name in sorted(repo_names))
    new_block = f"use_repo(\n    webref_cddl_extension,\n{repo_list}\n)"
    content, count = re.subn(
        r"use_repo\(\n    webref_cddl_extension,\n.*?\n\)",
        new_block,
        content,
        flags=re.S,
    )
    if count != 1:
        raise RuntimeError(f"Expected exactly one webref_cddl_extension use_repo block, found {count}")
    MODULE_FILE.write_text(content)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--commit", help="pin this exact webref commit instead of the branch tip")
    parser.add_argument(
        "--branch",
        default="main",
        help="webref branch to resolve when --commit is omitted (default: main)",
    )
    args = parser.parse_args()

    commit = args.commit or resolve_commit(args.branch)
    print(f"Pinning {REPO}@{commit}")

    before = existing_repo_names(BZL_FILE.read_text())

View on GitHub (pinned to aa36b38e69)

Solutions

1. Inspect MODULE.bazel to verify the use_repo(webref_cddl_extension, ...) block exists with the expected formatting.
2. Restore MODULE.bazel from git (git checkout MODULE.bazel) if it was manually corrupted.
3. If the block was intentionally reformatted, update the regex pattern in update_module() to match the new format.
4. Ensure there is exactly one such block.

Example fix

null

import re

content = open('MODULE.bazel').read()
matches = re.findall(r'use_repo\(\n    webref_cddl_extension,\n.*?\n\)', content, flags=re.S)
if len(matches) != 1:
    print(f'WARNING: found {len(matches)} use_repo(webref_cddl_extension) blocks, expected 1')

null

null

When it happens

Trigger: Running update_cddl.py when MODULE.bazel has been edited to remove, reformat, or duplicate the use_repo(webref_cddl_extension, ...) block. The regex is strict about the formatting (must start with 'use_repo(\n webref_cddl_extension,'), so any whitespace or formatting change breaks the match.

Common situations: Manual reformatting of MODULE.bazel (e.g., by a Bazel formatter or editor); the use_repo block was renamed or removed during a Bazel module migration; merge conflicts altered the block formatting; someone changed the indentation or added comments inside the block that break the regex.

Related errors

• Expected exactly one {where} in {BZL_FILE.name}, found {n}
• Failed to list {CDDL_PATH} at {commit}: HTTP {r.status}
• Failed to download {url}: HTTP {r.status}
• Failed to resolve {repo}@{branch}: HTTP {r.status}
• Download unavailable (HTTP {r.status}): {url}

AI-assisted analysis of SeleniumHQ/selenium@aa36b38e69 (2026-08-14). Data as JSON: /api/errors/3793689e2bdb1666. Report an issue: GitHub.