artifact_hash.py
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| 1 | """Parse ``ARTIFACT_SHA256`` from verify script stdout (§K9.5).""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | import re |
| 6 | |
| 7 | _SHA_LINE = re.compile(r"^ARTIFACT_SHA256=([0-9a-fA-F]+)$") |
| 8 | |
| 9 | |
| 10 | def parse_artifact_sha256(stdout: bytes) -> str | None: |
| 11 | """Decode stdout, strip trailing newlines, parse last line for artifact hash.""" |
| 12 | try: |
| 13 | text = stdout.decode("utf-8") |
| 14 | except UnicodeDecodeError: |
| 15 | return None |
| 16 | stripped = text.rstrip("\n\r") |
| 17 | if not stripped: |
| 18 | return None |
| 19 | if "\n" in stripped: |
| 20 | line = stripped.rsplit("\n", 1)[-1] |
| 21 | else: |
| 22 | line = stripped |
| 23 | match = _SHA_LINE.match(line) |
| 24 | if not match: |
| 25 | return None |
| 26 | return match.group(1).lower() |