cpython_4/environment/Dockerfile

# LoLBench eval image: CPython PR-29581 (PEP 654: Exception Groups and except*)
#   Requirement: https://peps.python.org/pep-0654/
#   base_commit: 850aefc2c651110a784cd5478af9774b1f6287a3 (parent of
#                merge commit d60457a6673cf0263213c2f2be02c633ec2e2038
#                — see spec.json base_commit_note for why this overrides
#                the CSV value)
#
# Agent-facing contract (the agent does NOT run anything inside this image;
# the evaluator runs the container after the agent submits a solution.patch):
#
#   docker run --rm \
#       --network=none \
#       -v $(pwd)/solution.patch:/in/solution.patch:ro \
#       -v $(pwd)/out:/out \
#       lolbench/cpython-pr-29581:1
#
# Unlike the PEP-768 instance, this PR (PEP 654's except* statements
# + ExceptionGroup machinery) does NOT need --cap-add=SYS_PTRACE: the
# new exception path runs entirely in-process. The container stays
# --network=none with the default seccomp profile.
#
# Because the agent's code never executes here, the container runs every
# step as root — no agent UID, no chown of /usr/local, no runuser dance.
#
# Layered build per docs/executable_environment_plan.md §4:
#   layer 1: ubuntu:22.04
#   layer 2: lolbench/cpython-base:1    (toolchain + stdlib build deps)
#   layer 3: THIS image                  (cpython @ base_commit + built python + private bundle)

ARG BASE_IMAGE=lolbench/cpython-base:1
FROM ${BASE_IMAGE}

ARG BASE_COMMIT=850aefc2c651110a784cd5478af9774b1f6287a3

# ---- Per-instance dirs ------------------------------------------------
# /opt/lolbench/private/ holds the eval-side artifacts (eval_tests.patch,
# selectors, golden solution.patch, run_tests.sh).  We keep the path
# name `private` to document intent; perms are default since the
# container is only ever run by the trusted evaluator.
RUN mkdir -p /opt/lolbench/private /in /out /workspace

# ---- Source tree at base_commit ---------------------------------------
# After fetching at the exact base_commit, we reset git history so
# `git log` inside the container does not reveal the SHA (kept for
# tidiness; the evaluator already knows the base, the agent never
# sees the container).
WORKDIR /workspace
RUN git init cpython && \
    cd cpython && \
    git remote add origin https://github.com/python/cpython.git && \
    git fetch --no-tags origin ${BASE_COMMIT} && \
    git checkout ${BASE_COMMIT} && \
    git config user.email lolbench@local && \
    git config user.name lolbench && \
    if ! git diff --quiet || ! git diff --cached --quiet || [ -n "$(git ls-files --others --exclude-standard)" ]; then \
      git add -A && git -c commit.gpgsign=false commit -q -m "LoLBench environment overlay"; \
    fi && \
    git tag -f base && git tag -f lolbench-base && \
    git for-each-ref --format='%(refname)' refs/heads refs/remotes refs/tags | \
      while read ref; do \
        case "$ref" in refs/tags/base|refs/tags/lolbench-base) ;; *) git update-ref -d "$ref" ;; esac; \
      done && \
    ( git remote remove origin 2>/dev/null || true ) && \
    rm -f .git/FETCH_HEAD && \
    git reflog expire --expire=now --all && \
    git repack -Ad && \
    git prune --expire=now && \
    git config --global --add safe.directory /workspace/cpython

# ---- Pre-build CPython at base_commit ---------------------------------
# A single full build at base_commit warms the build tree so that
# applying solution.patch at eval time only triggers an incremental
# rebuild (Make handles the dependency graph).  We deliberately do NOT
# pre-apply the patch — the eval/validate dispatcher decides which
# patch to apply per run.
#
# Build flags rationale:
#   --prefix=/usr/local : keep system layout; we use ./python, not the
#                         installed binary, so the install step is omitted
#   --with-pydebug      : OFF (default).  Enabling pydebug doubles test
#                         duration and changes ABI in ways unrelated to
#                         PEP 654.  We build the release configuration.
#   --enable-shared     : OFF (default).  The static interpreter is what
#                         regrtest expects.
#   PEP 654 build       : no extra configure flags.  solution.patch
#                         extends Grammar/python.gram with except*
#                         productions, regenerates Parser/parser.c
#                         (+2770/-1826 lines), adds ast.TryStar +
#                         ExceptHandler ASDL nodes, the new opcode
#                         CHECK_EG_MATCH (and related), and the runtime
#                         BaseExceptionGroup/ExceptionGroup classes
#                         in Objects/exceptions.c. ExceptionGroup as a
#                         builtin type was added in a separate earlier
#                         PR (3.11 alpha); THIS PR adds the except*
#                         syntactic form on top of it. At pre-state
#                         neither the except* parser productions nor
#                         the new opcodes exist → base build is plain
#                         CPython 3.11.0a3-era from 850aefc2.
# `set -o pipefail` so `make ... | tee log` propagates make's non-zero
# exit; otherwise a broken CPython build could ship as a green image
# (the pipeline's exit status would be tee's exit status, which is 0).
SHELL ["/bin/bash", "-o", "pipefail", "-c"]
RUN cd /workspace/cpython && \
    ./configure --prefix=/usr/local --enable-optimizations=no && \
    jobs=$(awk '$1!="max"{printf("%d", ($1+$2-1)/$2)}' /sys/fs/cgroup/cpu.max 2>/dev/null); \
    : "${jobs:=$(nproc)}"; \
    [ "$jobs" -lt 1 ] && jobs=1; \
    make -j"$jobs" 2>&1 | tee /tmp/cpython-build.log | tail -400

# ---- Eval bundle ------------------------------------------------------
# All eval-side files live in the instance directory root.  The
# Dockerfile bakes them into /opt/lolbench/private/ inside the
# container; the path name is just a stable tooling convention since
# the container runs as root throughout (the agent/evaluator boundary
# is the eval API, not Unix permissions).

# Harbor runtime adapter: keep the image public/agent-safe.
RUN mkdir -p /opt/lolbench /logs/artifacts /logs/agent /logs/verifier /in /out && \
    if ! id -u agent >/dev/null 2>&1; then useradd -m -s /bin/bash agent; fi
COPY metadata.json /opt/lolbench/metadata.json
COPY lolbench-submit /usr/local/bin/lolbench-submit
RUN chmod +x /usr/local/bin/lolbench-submit && \
    git config --global --add safe.directory /workspace/cpython && \
    if [ -d /workspace/cpython/.git ]; then \
      cd /workspace/cpython && git ls-files --others --exclude-standard | sort > /opt/lolbench/base_untracked.txt; \
    else \
      : > /opt/lolbench/base_untracked.txt; \
    fi && \
    chown -R agent:agent /workspace/cpython /logs
# Local-reference hardening: retain only the approved base history.
RUN cd /workspace/cpython && \
    git for-each-ref --format='%(refname)' refs/heads refs/remotes refs/tags | \
      while read ref; do \
        case "$ref" in refs/tags/base|refs/tags/lolbench-base) ;; *) git update-ref -d "$ref" ;; esac; \
      done && \
    ( git remote remove origin 2>/dev/null || true ) && \
    rm -f .git/FETCH_HEAD && \
    git reflog expire --expire=now --all && \
    git repack -Ad && \
    git prune --expire=now && \
    unreachable=$(git fsck --unreachable --no-reflogs) && \
    test -z "$unreachable" && \
    chown -R agent:agent .git
# Remove installed Python source copies/backports and package caches.
RUN for root in /usr/local/lib /usr/lib; do \
      [ ! -d "$root" ] || find "$root" -type d \
        \( -path '*/site-packages/pip' -o -path '*/dist-packages/pip' -o \
           -name ensurepip -o -name tomllib -o -name zoneinfo -o \
           -path '*/site-packages/tomli*' -o -path '*/dist-packages/tomli*' -o \
           -path '*/site-packages/typing_extensions*' -o -path '*/dist-packages/typing_extensions*' -o \
           -path '*/site-packages/exceptiongroup*' -o -path '*/dist-packages/exceptiongroup*' \) \
        -prune -exec rm -rf '{}' +; \
      [ ! -d "$root" ] || find "$root" -type f \
        \( -name 'tomli*.py' -o -name 'typing_extensions*.py' -o -name 'exceptiongroup*.py' \) -delete; \
    done && \
    rm -rf /usr/share/python-wheels /usr/share/python3-wheels \
           /root/.cache/pip /root/.cache/uv /home/agent/.cache/pip /home/agent/.cache/uv && \
    rm -f /usr/local/bin/pip /usr/local/bin/pip3 /usr/local/bin/pip3.* \
          /usr/bin/pip /usr/bin/pip3 /usr/bin/pip3.* && \
    for p in /usr/local/lib/python*/site-packages /usr/lib/python*/dist-packages; do \
      [ ! -d "$p" ] || { chown -R root:root "$p"; chmod -R go-w "$p"; chmod 0711 "$p"; }; \
    done
USER agent
WORKDIR /workspace/cpython
ENV LOLBENCH_INSTANCE_ID=cpython_4
ENV LOLBENCH_SOURCE_SLUG=CPython_PEP-654_Exception-Groups-and-except_PR-29581