[spark-compete] fix(cli): root-safe default spark home and write-denied prefix

[driasim]

"{\n "schema": "spark-compete-hotfix-v1",\n "event": "spark-compete-first-event",\n "submission_mode": "public_repo_pr",\n "submission_target_url": "https://github.com/vibeforge1111/spark-cli/pull/493\",\n "team": {\n "name": "Rayiea Hub",\n "members": [\n "driasim",\n "trmidhi",\n "yasfib"\n ],\n "llm_device_holder": "driasim",\n "device_holder_github": "https://github.com/driasim\",\n "github_accounts": [\n "driasim",\n "trmidhi",\n "yasfib"\n ]\n },\n "target_repo": {\n "id": "vibeforge1111/spark-cli",\n "source": "https://github.com/vibeforge1111/spark-cli\",\n "owner_surface": "spark-cli"\n },\n "issue": {\n "type": "bug",\n "severity": "critical",\n "title": "Root installs mark /root as write-denied against itself and default spark home is unsafe",\n "actual_behavior": "When Spark runs as root, default_spark_home() uses /root/.spark and write_denied_prefixes() includes /root, causing hosted policy to treat the active spark home as write-denied.",\n "expected_behavior": "Root installs prefer /opt/spark (or /var/lib/spark when present) and skip denying the active home prefix against itself.",\n "repro_steps": [\n "Run write_denied_prefixes() with policy_home_path=/root while spark_runtime_is_root() \u2014 /root appears in deny list",\n "PYTHONPATH=src python -m pytest tests/test_cli.py::SparkCliTests::test_write_denied_prefixes_skips_root_when_spark_home_is_root -q"\n ],\n "affected_workflow": "Hosted/root Spark installs, spark setup on VPS"\n },\n "evidence": {\n "safe_links_only": true,\n "before_after_proof": "BEFORE: /root listed as write-denied when home is /root. AFTER: root home skipped from POSIX deny list; default_spark_home() returns /opt/spark when running as root.",\n "links": [\n "https://github.com//pull/493"\n ],\n "forbidden": [\n "pdf",\n "zip",\n "exe",\n "tokens",\n "browser cookies",\n "wallet material",\n "raw logs",\n "raw conversations",\n "raw memory",\n "raw patches",\n "private repo maps",\n "private scoring details"\n ]\n },\n "proposed_fix": {\n "approach": "Add spark_runtime_is_root(), root-aware default_spark_home(), and skip self-denial in write_denied_prefixes().",\n "files_expected": [\n "src/spark_cli/cli.py (+20 lines)",\n "tests/test_cli.py (+2 tests)"\n ],\n "tests_or_smoke": "PYTHONPATH=src python -m pytest tests/test_cli.py::SparkCliTests::test_default_spark_home_uses_opt_spark_for_root tests/test_cli.py::SparkCliTests::test_write_denied_prefixes_skips_root_when_spark_home_is_root -q"\n },\n "pr": {\n "branch": "fix/root-spark-home-prefix",\n "title_prefix": "[spark-compete]",\n "author_github": "driasim",\n "body_must_include": [\n "packet",\n "team",\n "pr_author",\n "repo",\n "actual_behavior",\n "expected_behavior",\n "repro_steps",\n "before_after_proof",\n "tests_or_smoke",\n "duplicate_notes",\n "risk_notes",\n "review_claim"\n ],\n "url": "https://github.com/vibeforge1111/spark-cli/pull/493\"\n },\n "review_claim": {\n "impact_claim": "critical",\n "evidence_types": [\n "passing_test"\n ],\n "duplicate_notes": "Distinct from Rayiea spark-cli security PRs; targets root hosted home policy only.",\n "risk_notes": "Non-root installs unchanged; root path selection only applies when geteuid()==0.",\n "review_state_requested": "pr_review"\n }\n}"

[vibeforge1111]

Spark Compete review feedback for your agent/LLM:

This PR needs contributor follow-up before it can move forward.

Please update the PR with a valid hotfix packet, safe before/after proof, tests or smoke output, duplicate notes, and risk notes. Keep the change focused and public-safe.

Points, merge, Mac Lab, and installer consideration stay locked until the review gates clear.

[vibeforge1111]

Spark Compete review status

PR: #493
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