A way to configure sys.executable flags at PEX runtime about pex HOT 8 CLOSED

:; head -123 test.pex
#!/bin/sh
# N.B.: This script should stick to syntax defined for POSIX `sh` and avoid non-builtins.
# See: https://pubs.opengroup.org/onlinepubs/9699919799/idx/shell.html
set -eu

VENV=""
VENV_PYTHON_ARGS="-sE"

# N.B.: This ensures tilde-expansion of the DEFAULT_PEX_ROOT value.
DEFAULT_PEX_ROOT="$(echo ~/.pex)"

DEFAULT_PYTHON="/usr/bin/env"
DEFAULT_PYTHON_ARGS="python -u"

PEX_ROOT="${PEX_ROOT:-${DEFAULT_PEX_ROOT}}"
INSTALLED_PEX="${PEX_ROOT}/unzipped_pexes/466b0553ddeea983208b65ba0b5f9870e10b1127"

if [ -n "${VENV}" -a -x "${INSTALLED_PEX}" ]; then
    # We're a --venv execution mode PEX installed under the PEX_ROOT and the venv
    # interpreter to use is embedded in the shebang of our venv pex script; so just
    # execute that script directly.
    export PEX="$0"
    if [ -n "${VENV_PYTHON_ARGS}" ]; then
        exec "${INSTALLED_PEX}/bin/python" "${VENV_PYTHON_ARGS}" "${INSTALLED_PEX}" \
            "$@"
    else
        exec "${INSTALLED_PEX}/bin/python" "${INSTALLED_PEX}" "$@"
    fi
fi

find_python() {
    for python in \
"python3.12" \
"python3.11" \
"python3.10" \
"python3.9" \
"python3.8" \
"python3.7" \
"python3.6" \
"python3.5" \
"python2.7" \
"pypy3.12" \
"pypy3.11" \
"pypy3.10" \
"pypy3.9" \
"pypy3.8" \
"pypy3.7" \
"pypy3.6" \
"pypy3.5" \
"pypy2.7" \
"python3" \
"python2" \
"pypy3" \
"pypy2" \
"python" \
"pypy" \
    ; do
        if command -v "${python}" 2>/dev/null; then
            return
        fi
    done
}

if [ -x "${DEFAULT_PYTHON}" ]; then
    python_exe="${DEFAULT_PYTHON} ${DEFAULT_PYTHON_ARGS}"
else
    python_exe="$(find_python)"
fi
if [ -n "${python_exe}" ]; then
    if [ -n "${PEX_VERBOSE:-}" ]; then
        echo >&2 "$0 used /bin/sh boot to select python: ${python_exe} for re-exec..."
    fi
    if [ -z "${VENV}" -a -e "${INSTALLED_PEX}" ]; then
        # We're a --zipapp execution mode PEX installed under the PEX_ROOT with a
        # __main__.py in our top-level directory; so execute Python against that
        # directory.
        export __PEX_EXE__="$0"
        exec ${python_exe} "${INSTALLED_PEX}" "$@"
    else
        # The slow path: this PEX zipapp is not installed yet. Run the PEX zipapp so it
        # can install itself, rebuilding its fast path layout under the PEX_ROOT.
        if [ -n "${PEX_VERBOSE:-}" ]; then
            echo >&2 "Running zipapp pex to lay itself out under PEX_ROOT."
        fi
        exec ${python_exe} "$0" "$@"
    fi
fi

echo >&2 "Failed to find any of these python binaries on the PATH:"
for python in \
"python3.12" \
"python3.11" \
"python3.10" \
"python3.9" \
"python3.8" \
"python3.7" \
"python3.6" \
"python3.5" \
"python2.7" \
"pypy3.12" \
"pypy3.11" \
"pypy3.10" \
"pypy3.9" \
"pypy3.8" \
"pypy3.7" \
"pypy3.6" \
"pypy3.5" \
"pypy2.7" \
"python3" \
"python2" \
"pypy3" \
"pypy2" \
"python" \
"pypy" \
; do
    echo >&2 "${python}"
done
echo >&2 "Either adjust your $PATH which is currently:"
echo >&2 "${PATH}"
echo >&2 -n "Or else install an appropriate Python that provides one of the binaries in "
echo >&2 "this list."
exit 1
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