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Issue title

`self.repo` used but never assigned in __init__

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Top 5 (default)
Severity Rule Title File:line
HIGH MINED006 [MINED006] Overcatch Baseexception: except BaseException: ... — prevents Ctrl+C and Syste… ci/nur/update.py:52
HIGH SEC103 [SEC103] LDAP injection — non-constant search filter: User input concatenated into an LDA… ci/nur/prefetch.py:110
HIGH SEC128 [SEC128] Async function without await — fire-and-forget Promise (AI mistake): Async call … ci/nur/index.py:78
HIGH MINED001 [MINED001] Bare Except Pass: except: pass or except Exception: pass — silently swallows e… ci/nur/error.py:1
HIGH MINED108 `self.repo` used but never assigned in __init__ ci/nur/prefetch.py:135
HIGH MINED108 `self.repo` used but never assigned in __init__ ci/nur/prefetch.py:134
HIGH MINED108 `self.repo` used but never assigned in __init__ ci/nur/prefetch.py:131
HIGH MINED108 `self.repo` used but never assigned in __init__ ci/nur/prefetch.py:126
HIGH CORE_NO_TESTS No test files found —
MED COMP001 [COMP001] High cognitive complexity: Function `_find_root` has cognitive complexity 15 (S… ci/nur/path.py:12
LOW COMP001 [COMP001] High cognitive complexity: Function `resolve_source` has cognitive complexity 1… ci/nur/index.py:11
LOW COMP001 [COMP001] High cognitive complexity: Function `update_combined` has cognitive complexity … ci/nur/combine.py:120
INFO MINED072 [MINED072] Python Pass Only Class: class Foo: pass — stub waiting to be filled in. ci/nur/error.py:1
INFO MINED050 [MINED050] Stub Only Function: Function declared but body is just pass, return None, rais… ci/nur/error.py:2
Reset to top 5 14 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `nix-community/NUR`

**Score: 88/100 (C+)**  ·  14 findings  ·  scanned 2026-06-06 01:11 UTC  ·  980 LOC

| Severity | Count |
|---|---|
| CRITICAL | 0 |
| HIGH | 9 |
| MEDIUM | 1 |
| LOW | 2 |

📊 [Full filterable report](https://repobility.com/scan/16bdfad9-4722-4992-ac5f-06c43c422493/)  ·  ![scorecard](https://repobility.com/scan/16bdfad9-4722-4992-ac5f-06c43c422493/report.png?v=1780708285-s2)

### Top findings

1. **HIGH** `MINED006` — Overcatch Baseexception
   `ci/nur/update.py:52` · CWE-705 · ✓ Repobility
2. **HIGH** `SEC103` — LDAP injection — non-constant search filter
   `ci/nur/prefetch.py:110` · A03:2021 Injection
3. **HIGH** `SEC128` — Async function without await — fire-and-forget Promise (AI mistake)
   `ci/nur/index.py:78`
4. **HIGH** `MINED001` — Bare Except Pass
   `ci/nur/error.py:1` · CWE-755 · ✓ Repobility
5. **HIGH** `MINED108` — `self.repo` used but never assigned in __init__
   `ci/nur/prefetch.py:135` · ✓ Repobility

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**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.

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