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sha256-to-hash.py: Gracefully handles errors, like invalid hashes in examples

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This commit is contained in:
nicoo 2023-09-13 16:42:45 +00:00
parent 9012e71c9b
commit a0b1f164af
1 changed files with 18 additions and 9 deletions
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27
maintainers/scripts/sha256-to-SRI.py
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@ -4,13 +4,12 @@
from contextlib import contextmanager from contextlib import contextmanager
from pathlib import Path from pathlib import Path
import re import logging, re
nix32alphabet = "0123456789abcdfghijklmnpqrsvwxyz" nix32alphabet = "0123456789abcdfghijklmnpqrsvwxyz"
nix32inverted = { c: i for i, c in enumerate(nix32alphabet) } nix32inverted = { c: i for i, c in enumerate(nix32alphabet) }
def nix32decode(s: str) -> bytes: def nix32decode(s: str) -> bytes:
# only support sha256 hashes for now # only support sha256 hashes for now
assert len(s) == 52 assert len(s) == 52
@ -60,9 +59,7 @@ def sha256toSRI(m: re.Match) -> str:
from base64 import b64decode from base64 import b64decode
return toSRI(b64decode(m['base64'])) return toSRI(b64decode(m['base64']))
begin, end = m.span() raise ValueError("Got a match where none of the groups captured")
raise ValueError("Got a match where none of the groups captured:\n"
f"'{m.string[begin:end]}'")
# Ohno I used evil, irregular backrefs instead of making 2 variants ^^' # Ohno I used evil, irregular backrefs instead of making 2 variants ^^'
@ -73,10 +70,22 @@ _def_re = re.compile(
) )
def defToSRI(s: str) -> str: def defToSRI(s: str) -> str:
return _def_re.sub( def f(m: re.Match[str]) -> str:
lambda m: f'hash = "{sha256toSRI(m)}";', try:
s, return f'hash = "{sha256toSRI(m)}";'
)
except ValueError as exn:
begin, end = m.span()
match = m.string[begin:end]
logging.error(
f"Skipping '%s': an exception was raised during rewriting",
match,
exc_info = exn,
)
return match
return _def_re.sub(f, s)
@contextmanager @contextmanager