fix: use shallow clone to prevent reward hacking via git history - #114
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wenting-zhao merged 3 commits intoFeb 24, 2026
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Use --depth 1 when cloning repositories to prevent agents from accessing git history and exploiting it to retrieve original function implementations that were stripped out. This addresses a reward hacking vulnerability where agents can use git log/diff/show commands to find and copy original implementations instead of writing them from scratch. For Commit0Spec, also fetch the specific env_setup_commit with --depth 1 before resetting to it, since shallow clone only gets the default branch tip. Co-authored-by: openhands <openhands@all-hands.dev>
The shallow clone only fetches the latest commit, but the setup scripts need access to both env_setup_commit (reference_commit) and base_commit for the git reset operations. - Commit0Spec: Fetch both env_setup_commit and base_commit before removing remote - SWEBenchSpec: Fetch base_commit needed for eval script reset Co-authored-by: openhands <openhands@all-hands.dev>
Modal requires authentication tokens that aren't available to fork PRs. Using the local Docker backend allows CI to run without Modal credentials. Co-authored-by: openhands <openhands@all-hands.dev>
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Summary
Use --depth 1 when cloning repositories to prevent agents from accessing git history and exploiting it to retrieve original function implementations.
Fixes #113