[OSAC-3833] PRD: CaaS Bare Metal Worker Node Provisioning

.github/scripts/check_ep_naming.py

@@ -0,0 +1,176 @@
+#!/usr/bin/env python3
+"""Validate enhancements/ directory and file naming for paths new to a PR.
+
+Directories and files that already existed at the PR base branch are
+grandfathered — this only enforces the naming convention on new work.
+
+Enforcement requires a PR base SHA (set via PRE_COMMIT_PR_BASE_SHA, always
+present in the CI pre-commit job). Local runs without it are advisory-only
+(a note is printed, nothing is flagged) so the git hook never blocks a
+commit that CI would pass.
+
+PRE_COMMIT_PR_BASE_SHA is a snapshot of `main` taken from the
+`pull_request` webhook payload at the PR's last open/synchronize event —
+it does not advance just because `main` gains new commits, and re-running
+an old CI job replays that same stale payload rather than refreshing it.
+For a long-lived PR that hasn't been pushed to since some *other*,
+unrelated PR merged a still-non-compliant directory into `main`, that
+stale SHA predates the unrelated directory, so it looks "new" here and
+gets (incorrectly) enforced against — even though the current PR never
+touches it and it's already correctly grandfathered on `main` itself.
+
+To avoid that false positive, grandfathering also checks the *live* tip
+of the base branch (PRE_COMMIT_LIVE_BASE_REF, e.g. `origin/main`, fetched
+fresh at the start of every CI run) in addition to the stale base SHA: a
+path is grandfathered if it exists at *either* reference. This keeps
+enforcement scoped to paths that are genuinely new — including for
+contributors actively renaming their own non-compliant directory to fix
+it, who should never be blocked by an unrelated pre-existing violation
+elsewhere in the repo.
+"""
+
+import os
+import re
+import subprocess
+import sys
+
+NAME_RE = re.compile(r"^OSAC-[1-9][0-9]*-[a-z0-9]+(?:-[a-z0-9]+)*$")
+CHECKED_FILENAMES = frozenset({"prd.md", "design.md"})
+
+BASE_SHA_ENV_VAR = "PRE_COMMIT_PR_BASE_SHA"
+LIVE_BASE_REF_ENV_VAR = "PRE_COMMIT_LIVE_BASE_REF"
+
+
+def path_exists_at_ref(ref: str, path: str) -> bool:
+    result = subprocess.run(
+        ["git", "cat-file", "-e", f"{ref}:{path}"],
+        capture_output=True,
+        check=False,
+    )
+    return result.returncode == 0
+
+
+def ref_exists(ref: str) -> bool:
+    result = subprocess.run(
+        ["git", "cat-file", "-e", ref], capture_output=True, check=False
+    )
+    return result.returncode == 0
+
+
+def top_level_enhancement_dir(path: str) -> str | None:
+    prefix = "enhancements/"
+    if not path.startswith(prefix):
+        return None
+    rest = path[len(prefix):]
+    if "/" not in rest:
+        return None
+    return rest.split("/", 1)[0]
+
+
+def resolve_live_base_ref(live_base_ref: str | None) -> str | None:
+    # The live ref is best-effort: it's only set in CI (and only useful once
+    # actions/checkout has actually fetched it). If it's absent or doesn't
+    # resolve, grandfathering silently falls back to the base-SHA-only
+    # behavior below rather than erroring — this is a supplementary check,
+    # not a required one.
+    if live_base_ref is not None and ref_exists(live_base_ref):
+        return live_base_ref
+    return None
+
+
+def is_grandfathered(
+    path: str, base_sha: str | None, live_base_ref: str | None
+) -> bool:
+    if base_sha is not None and path_exists_at_ref(base_sha, path):
+        return True
+    if live_base_ref is not None and path_exists_at_ref(live_base_ref, path):
+        return True
+    return False
+
+
+def validate_paths(
+    paths: list[str],
+    base_sha: str | None,
+    live_base_ref: str | None = None,
+) -> list[str]:
+    # No base SHA at all means this is a local, non-CI run (CI always sets
+    # PRE_COMMIT_PR_BASE_SHA). Enforcing here would block commits that CI
+    # would pass — e.g. anyone with the git hook installed editing a file in
+    # an existing legacy directory — and push contributors toward
+    # `--no-verify`, which skips every other hook too. So local runs are
+    # advisory-only; CI remains the sole enforcement gate.
+    if base_sha is None:
+        print(
+            "note: no PR base SHA available — normal for local, non-CI "
+            "runs (pre-commit has no way to know your PR's base branch "
+            "outside CI). Skipping enhancements/ naming/casing checks "
+            "here; the CI pre-commit job (which sets "
+            "PRE_COMMIT_PR_BASE_SHA) is the authoritative gate and will "
+            "still catch violations before merge.",
+            file=sys.stderr,
+        )
+        return []
+
+    # A base SHA *was* provided (i.e. we're in CI) but doesn't resolve —
+    # unlike the "no base SHA" case above, this indicates a CI
+    # misconfiguration (e.g. a shallow checkout) and should stay fail-closed
+    # rather than silently disabling enforcement. That fail-closed guarantee
+    # covers the live ref too: a checkout broken enough that the base SHA
+    # doesn't resolve can't be trusted to have fetched the live ref
+    # correctly either, so grandfathering is disabled entirely here, not
+    # just narrowed to one reference.
+    if not ref_exists(base_sha):
+        print(
+            f"warning: PR base SHA '{base_sha}' is not available in this "
+            "checkout (the checkout step needs fetch-depth: 0) — "
+            "grandfathering disabled, every enhancements/ path will be "
+            "validated as new",
+            file=sys.stderr,
+        )
+        base_sha = None
+        live_base_ref = None
+    else:
+        live_base_ref = resolve_live_base_ref(live_base_ref)
+
+    violations = []
+    for path in paths:
+        dir_name = top_level_enhancement_dir(path)
+        if dir_name is None:
+            continue
+
+        dir_path = f"enhancements/{dir_name}"
+        dir_is_grandfathered = is_grandfathered(dir_path, base_sha, live_base_ref)
+
+        if not dir_is_grandfathered and not NAME_RE.match(dir_name):
+            violations.append(
+                f"{path}: directory '{dir_name}' doesn't match the "
+                "required format OSAC-<jira-key>-<slug> (e.g. "
+                "OSAC-1110-storage-tier-api) — see CONTRIBUTING.md for "
+                "the full naming convention"
+            )
+
+        basename = path.rsplit("/", 1)[-1]
+        if basename.lower() not in CHECKED_FILENAMES or basename.lower() == basename:
+            continue
+
+        file_is_grandfathered = is_grandfathered(path, base_sha, live_base_ref)
+        if not file_is_grandfathered:
+            violations.append(
+                f"{path}: filename '{basename}' must be lowercase "
+                f"('{basename.lower()}')"
+            )
+
+    return violations
+
+
+def main(argv: list[str]) -> int:
+    base_sha = os.environ.get(BASE_SHA_ENV_VAR) or None
+    live_base_ref = os.environ.get(LIVE_BASE_REF_ENV_VAR) or None
+    violations = validate_paths(argv, base_sha, live_base_ref)
+    for violation in violations:
+        print(violation, file=sys.stderr)
+    return 1 if violations else 0
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))