FAILURE MAP
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Installed distribution record validation: Wrong file sizes pass validation · case 01

Wrong file sizes pass validation.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes False for manifest[k][1] != installed[k][1], so wrong file sizes pass validation.

THE FAILURE

The implementation substitutes False for manifest[k][1] != installed[k][1], so wrong file sizes pass validation.

Unsuccessful approach: The attempted repair substitutes manifest[k][1] == installed[k][1]. Fixture 4 still yields {'missing': [], 'extra': [], 'digest': ['a'], 'size': ['a'], 'executable': []} instead of {'missing': [], 'extra': [], 'digest': ['a'], 'size': [], 'executable': []}.

Case contract

Report missing files, unexpected files, digest mismatches, size mismatches, and forbidden executables independently. Metadata is a digest-size-executable tuple.

Why this case matters

An offline model of installed distribution record validation, suitable for testing build and release tooling without external services.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(manifest, installed, executable_allowed):
    common = set(manifest) & set(installed)
    return {'missing': sorted(set(manifest)-set(installed)), 'extra': sorted(set(installed)-set(manifest)), 'digest': sorted(k for k in common if manifest[k][0] != installed[k][0]), 'size': sorted(k for k in common if False), 'executable': sorted(k for k in installed if installed[k][2] and k not in executable_allowed)}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve({}, {}, []), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': []})
check('fixture 2', solve({'a': ('x', 1, False)}, {}, []), {'missing': ['a'], 'extra': [], 'digest': [], 'size': [], 'executable': []})
check('fixture 3', solve({}, {'a': ('x', 1, False)}, []), {'missing': [], 'extra': ['a'], 'digest': [], 'size': [], 'executable': []})
check('fixture 4', solve({'a': ('x', 1, False)}, {'a': ('y', 1, False)}, []), {'missing': [], 'extra': [], 'digest': ['a'], 'size': [], 'executable': []})
check('fixture 5', solve({'a': ('x', 1, False)}, {'a': ('x', 2, False)}, []), {'missing': [], 'extra': [], 'digest': [], 'size': ['a'], 'executable': []})
check('fixture 6', solve({'a': ('x', 1, False)}, {'a': ('x', 1, True)}, []), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': ['a']})
check('fixture 7', solve({'a': ('x', 1, False)}, {'a': ('x', 1, True)}, ['a']), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': []})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}Passed
fixture 2{'digest': [], 'executable': [], 'extra': [], 'missing': ['a'], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': ['a'], 'size': []}Passed
fixture 3{'digest': [], 'executable': [], 'extra': ['a'], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': ['a'], 'missing': [], 'size': []}Passed
fixture 4{'digest': ['a'], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': ['a'], 'executable': [], 'extra': [], 'missing': [], 'size': []}Passed
fixture 5{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': ['a']}Failed
fixture 6{'digest': [], 'executable': ['a'], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': ['a'], 'extra': [], 'missing': [], 'size': []}Passed
fixture 7{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}Passed

SHA-256 / c7d9038e3b0baf208782d63b2045206a823b27e0d5b5a393aa4342621d1fc3f3

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(manifest, installed, executable_allowed):
    common = set(manifest) & set(installed)
    return {'missing': sorted(set(manifest)-set(installed)), 'extra': sorted(set(installed)-set(manifest)), 'digest': sorted(k for k in common if manifest[k][0] != installed[k][0]), 'size': sorted(k for k in common if manifest[k][1] == installed[k][1]), 'executable': sorted(k for k in installed if installed[k][2] and k not in executable_allowed)}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve({}, {}, []), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': []})
check('fixture 2', solve({'a': ('x', 1, False)}, {}, []), {'missing': ['a'], 'extra': [], 'digest': [], 'size': [], 'executable': []})
check('fixture 3', solve({}, {'a': ('x', 1, False)}, []), {'missing': [], 'extra': ['a'], 'digest': [], 'size': [], 'executable': []})
check('fixture 4', solve({'a': ('x', 1, False)}, {'a': ('y', 1, False)}, []), {'missing': [], 'extra': [], 'digest': ['a'], 'size': [], 'executable': []})
check('fixture 5', solve({'a': ('x', 1, False)}, {'a': ('x', 2, False)}, []), {'missing': [], 'extra': [], 'digest': [], 'size': ['a'], 'executable': []})
check('fixture 6', solve({'a': ('x', 1, False)}, {'a': ('x', 1, True)}, []), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': ['a']})
check('fixture 7', solve({'a': ('x', 1, False)}, {'a': ('x', 1, True)}, ['a']), {'missing': [], 'extra': [], 'digest': [], 'size': [], 'executable': []})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}Passed
fixture 2{'digest': [], 'executable': [], 'extra': [], 'missing': ['a'], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': ['a'], 'size': []}Passed
fixture 3{'digest': [], 'executable': [], 'extra': ['a'], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': ['a'], 'missing': [], 'size': []}Passed
fixture 4{'digest': ['a'], 'executable': [], 'extra': [], 'missing': [], 'size': ['a']}{'digest': ['a'], 'executable': [], 'extra': [], 'missing': [], 'size': []}Failed
fixture 5{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': ['a']}Failed
fixture 6{'digest': [], 'executable': ['a'], 'extra': [], 'missing': [], 'size': ['a']}{'digest': [], 'executable': ['a'], 'extra': [], 'missing': [], 'size': []}Failed
fixture 7{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': ['a']}{'digest': [], 'executable': [], 'extra': [], 'missing': [], 'size': []}Failed

SHA-256 / e9a52031cc3cce86af103957976401538c06a94ec4348eeb13980fe38baa8e89

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:38:34.158435+00:00.

Case digest / dd4781cadbe2969fd24c304cd8946450bfccb4c19415ccd556e765f585896377