python

#!/bin/sh
# The bootstrap seed uses ordinary host tools; user arguments belong to Python.
set -eu
root=$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd -P)
# shellcheck source=scripts/bootstrap-uv.sh
. "$root/scripts/bootstrap-uv.sh"
uv=$(bootstrap_uv "$root" python)
cache=${FRONTIER_TOOL_CACHE:-${XDG_CACHE_HOME:-"$HOME/.cache"}/frontier-preview-tools}
offline=false
[ "${FRONTIER_BOOTSTRAP_OFFLINE-0}" != 1 ] || offline=true
python_identity=$(bootstrap_checksum "$root/config/python-downloads.json")
# Keep selection and dependency-source overrides inside bootstrap subprocesses.
# Preserve proxy/certificate settings and uv's ordinary download cache locations.
managed_uv() (
    bootstrap_uv_sanitize
    export UV_PROJECT_ENVIRONMENT="$root/.tooling/venv"
    export UV_PYTHON_DOWNLOADS_JSON_URL="$root/config/python-downloads.json"
    # Metadata identity prevents another same-patch Python build from satisfying
    # the managed interpreter request.
    export UV_PYTHON_INSTALL_DIR="$cache/python/$python_identity"
    export UV_PYTHON_INSTALL_BIN=0 UV_NO_PROGRESS=1 UV_OFFLINE="$offline"
    "$uv" "$@"
)
python_version=$(cat "$root/.python-version")
managed_uv --no-config python install --no-bin --quiet "$python_version"
python_location=$(managed_uv --no-config python find --managed-python --no-project --system "$python_version")
export FRONTIER_UV="$uv"
export FRONTIER_PYTHON_BASE="${python_location%/bin/*}"
managed_uv --no-config sync --locked --managed-python --python "$python_location" \
    --project "$root" --no-build --quiet

# These two variables can redirect CPython's executable or standard library.
# Other Python flags, PYTHONPATH (including sitecustomize), and caller settings
# retain their normal meaning in the final interpreter and its children.
unset PYTHONHOME __PYVENV_LAUNCHER__
"$root/.tooling/venv/bin/python" -I -B -c '
from pathlib import Path
import sys
expected, base = sys.argv[1:]
if ".".join(map(str, sys.version_info[:3])) != expected:
    raise SystemExit(f"python: expected managed Python {expected}; rerun ./python")
if Path(sys.base_prefix).resolve() != Path(base).resolve():
    raise SystemExit("python: virtual environment uses a different Python build; remove .tooling/venv and rerun ./python")
' "$python_version" "$FRONTIER_PYTHON_BASE"
export PATH="$root/.tooling/venv/bin:$PATH"
exec "$root/.tooling/venv/bin/python" "$@"