概要

pyenvのパスの理解の仕方とインストールの手順が気になったので調べてみた。
前回はこちら

内容

ややはやりぎだが、早めに辿り着く。

`/usr/local/opt/pyenv/libexec/pyenv-install`

は、ない。

`/usr/local/opt/pyenv/bin/pyenv-install`

少しずつ見ていく。

set -e
[ -n "$PYENV_DEBUG" ] && set -x

決まり文句。

# Add `share/python-build/` directory from each pyenv plugin to the list of
# paths where build definitions are looked up.
shopt -s nullglob
for plugin_path in "$PYENV_ROOT"/plugins/*/share/python-build; do
  PYTHON_BUILD_DEFINITIONS="${PYTHON_BUILD_DEFINITIONS}:${plugin_path}"
done
export PYTHON_BUILD_DEFINITIONS
shopt -u nullglob

nullglobは空でもループできるようにするためのもの。
ここでは、~/.pyenv/pluginsは存在しないので、あまり気にしない。

# Provide pyenv completions
if [ "$1" = "--complete" ]; then
  echo --list
  echo --force
  echo --skip-existing
  echo --keep
  echo --patch
  echo --verbose
  echo --version
  echo --debug
  exec python-build --definitions
fi

コンプリートオプションがセットされた時の動作。インストール可能なものをリストアップできる。
なおwhich python-build: /usr/local/bin/python-build。

# Load shared library functions
eval "$(python-build --lib)"

よくわかっていない。

usage() {
  pyenv-help install 2>/dev/null
  [ -z "$1" ] || exit "$1"
}

ヘルプを表示するためのものだろう。

definitions() {
  local query="$1"
  python-build --definitions | $(type -P ggrep grep | head -1) -F "$query" || true
}

python-build definitionsは指定可能なバージョンを表示するもの。

indent() {
  sed 's/^/  /'
}

インデント。sedを使うのかなるほど。

unset FORCE
unset SKIP_EXISTING
unset KEEP
unset VERBOSE
unset HAS_PATCH
unset DEBUG

[ -n "$PYENV_DEBUG" ] && VERBOSE="-v"

どこかで使われていたのかもしれない。

parse_options "$@"
for option in "${OPTIONS[@]}"; do
  case "$option" in
  "h" | "help" )
    usage 0
    ;;
  "l" | "list" )
    echo "Available versions:"
    definitions | indent
    exit
    ;;
  "f" | "force" )
    FORCE=true
    ;;
  "s" | "skip-existing" )
    SKIP_EXISTING=true
    ;;
  "k" | "keep" )
    [ -n "${PYENV_BUILD_ROOT}" ] || PYENV_BUILD_ROOT="${PYENV_ROOT}/sources"
    ;;
  "v" | "verbose" )
    VERBOSE="-v"
    ;;
  "p" | "patch" )
    HAS_PATCH="-p"
    ;;
  "g" | "debug" )
    DEBUG="-g"
    ;;
  "version" )
    exec python-build --version
    ;;
  * )
    usage 1 >&2
    ;;
  esac
done

オプションの理解。

[ "${#ARGUMENTS[@]}" -le 1 ] || usage 1 >&2

unset VERSION_NAME

# The first argument contains the definition to install. If the
# argument is missing, try to install whatever local app-specific
# version is specified by pyenv. Show usage instructions if a local
# version is not specified.
DEFINITION="${ARGUMENTS[0]}"
[ -n "$DEFINITION" ] || DEFINITION="$(pyenv-local 2>/dev/null || true)"
[ -n "$DEFINITION" ] || usage 1 >&2

VERSIONの指定がされているか、指定されていなければ指定しようと試みている。

# Define `before_install` and `after_install` functions that allow
# plugin hooks to register a string of code for execution before or
# after the installation process.
declare -a before_hooks after_hooks

before_install() {
  local hook="$1"
  before_hooks["${#before_hooks[@]}"]="$hook"
}

after_install() {
  local hook="$1"
  after_hooks["${#after_hooks[@]}"]="$hook"
}

OLDIFS="$IFS"
IFS=$'\n' scripts=(`pyenv-hooks install`)
IFS="$OLDIFS"
for script in "${scripts[@]}"; do source "$script"; done

# Set VERSION_NAME from $DEFINITION, if it is not already set. Then
# compute the installation prefix.
[ -n "$VERSION_NAME" ] || VERSION_NAME="${DEFINITION##*/}"
[ -n "$DEBUG" ] && VERSION_NAME="${VERSION_NAME}-debug"
PREFIX="${PYENV_ROOT}/versions/${VERSION_NAME}"

[ -d "${PREFIX}" ] && PREFIX_EXISTS=1

ここで、PREFIX="${PYENV_ROOT}/versions/${VERSION_NAME}"

# If the installation prefix exists, prompt for confirmation unless
# the --force option was specified.
if [ -d "${PREFIX}/bin" ]; then
  if [ -z "$FORCE" ] && [ -z "$SKIP_EXISTING" ]; then
    echo "pyenv: $PREFIX already exists" >&2
    read -p "continue with installation? (y/N) "

    case "$REPLY" in
    y | Y | yes | YES ) ;;
    * ) exit 1 ;;
    esac
  elif [ -n "$SKIP_EXISTING" ]; then
    # Since we know the python version is already installed, and are opting to
    # not force installation of existing versions, we just `exit 0` here to
    # leave things happy
    exit 0
  fi
fi

# If PYENV_BUILD_ROOT is set, always pass keep options to python-build.
if [ -n "${PYENV_BUILD_ROOT}" ]; then
  export PYTHON_BUILD_BUILD_PATH="${PYENV_BUILD_ROOT}/${VERSION_NAME}"
  KEEP="-k"
fi

ここで、export PYTHON_BUILD_BUILD_PATH="${PYENV_BUILD_ROOT}/${VERSION_NAME}"

# Set PYTHON_BUILD_CACHE_PATH to $PYENV_ROOT/cache, if the directory
# exists and the variable is not already set.
if [ -z "${PYTHON_BUILD_CACHE_PATH}" ] && [ -d "${PYENV_ROOT}/cache" ]; then
  export PYTHON_BUILD_CACHE_PATH="${PYENV_ROOT}/cache"
fi

ここで、export PYTHON_BUILD_CACHE_PATH="${PYENV_ROOT}/cache"

if [ -z "${PYENV_BOOTSTRAP_VERSION}" ]; then
  case "${VERSION_NAME}" in
  [23]"."* )
    # Default PYENV_VERSION to the friendly Python version. (The
    # CPython installer requires an existing Python installation to run. An
    # unsatisfied local .python-version file can cause the installer to
    # fail.)
    for version_info in "${VERSION_NAME%-dev}" "${VERSION_NAME%.*}" "${VERSION_NAME%%.*}"; do
      # Anaconda's `curl` doesn't work on platform where `/etc/pki/tls/certs/ca-bundle.crt` isn't available (e.g. Debian)
      for version in $(pyenv-whence "python${version_info}" 2>/dev/null || true); do
        if [[ "${version}" != "anaconda"* ]] && [[ "${version}" != "miniconda"* ]]; then
          PYENV_BOOTSTRAP_VERSION="${version}"
          break 2
        fi
      done
    done
    ;;
  "pypy"*"-dev" | "pypy"*"-src" )
    # PyPy/PyPy3 requires existing Python 2.7 to build
    if [ -n "${PYENV_RPYTHON_VERSION}" ]; then
      PYENV_BOOTSTRAP_VERSION="${PYENV_RPYTHON_VERSION}"
    else
      for version in $(pyenv-versions --bare | sort -r); do
        if [[ "${version}" == "2.7"* ]]; then
          PYENV_BOOTSTRAP_VERSION="$version"
          break
        fi
      done
    fi
    if [ -n "$PYENV_BOOTSTRAP_VERSION" ]; then
      for dep in curses genc pycparser; do
        if ! PYENV_VERSION="$PYENV_BOOTSTRAP_VERSION" pyenv-exec python -c "import ${dep}" 1>/dev/null 2>&1; then
          echo "pyenv-install: $VERSION_NAME: PyPy requires \`${dep}' in $PYENV_BOOTSTRAP_VERSION to build from source." >&2
          exit 1
        fi
      done
    else
      echo "pyenv-install: $VERSION_NAME: PyPy requires Python 2.7 to build from source." >&2
      exit 1
    fi
    ;;
  esac
fi

if [ -n "${PYENV_BOOTSTRAP_VERSION}" ]; then
  export PYENV_VERSION="${PYENV_BOOTSTRAP_VERSION}"
fi

# Execute `before_install` hooks.
for hook in "${before_hooks[@]}"; do eval "$hook"; done

# Plan cleanup on unsuccessful installation.
cleanup() {
  [ -z "${PREFIX_EXISTS}" ] && rm -rf "$PREFIX"
}

trap cleanup SIGINT

# Invoke `python-build` and record the exit status in $STATUS.
STATUS=0
python-build $KEEP $VERBOSE $HAS_PATCH $DEBUG "$DEFINITION" "$PREFIX" || STATUS="$?"

ここで、インストールが行われる。なので、python-buildを見る。

# Display a more helpful message if the definition wasn't found.
if [ "$STATUS" == "2" ]; then
  { candidates="$(definitions "$DEFINITION")"
    here="$(dirname "${0%/*}")/../.."
    if [ -n "$candidates" ]; then
      echo
      echo "The following versions contain \`$DEFINITION' in the name:"
      echo "$candidates" | indent
    fi
    echo
    echo "See all available versions with \`pyenv install --list'."
    echo
    echo -n "If the version you need is missing, try upgrading pyenv"
    if [ "$here" != "${here#$(brew --prefix 2>/dev/null)}" ]; then
      printf ":\n\n"
      echo "  brew update && brew upgrade pyenv"
    elif [ -d "${here}/.git" ]; then
      printf ":\n\n"
      echo "  cd ${here} && git pull && cd -"
    else
      printf ".\n"
    fi
  } >&2
fi

# Execute `after_install` hooks.
for hook in "${after_hooks[@]}"; do eval "$hook"; done

# Run `pyenv-rehash` after a successful installation.
if [ "$STATUS" == "0" ]; then
  pyenv-rehash
else
  cleanup
fi

exit "$STATUS"

`/usr/local/opt/pyenv/bin/python-build`

少しずつ見て行こうかと思ったが、2000行あるので、やめておく。
python-build $KEEP $VERBOSE $HAS_PATCH $DEBUG "$DEFINITION" "$PREFIX" || STATUS="$?"に関連するところだけ見る。
なお、これは私の環境では、python-build -v 3.7.0 /Users/yo314159265/.pyenv/versions/3.7.0になる。

`PYTHON_BUILD_DEFINITIONS`

pyenv-build

PYTHON_BUILD_INSTALL_PREFIX="$(abs_dirname "$0")/.."

IFS=: PYTHON_BUILD_DEFINITIONS=($PYTHON_BUILD_DEFINITIONS ${PYTHON_BUILD_ROOT:-$PYTHON_BUILD_INSTALL_PREFIX}/share/python-build)
IFS="$OLDIFS"

PYTHON_BUILD_ROOTを指定。

pyenv-build

parse_options "$@"

for option in "${OPTIONS[@]}"; do
  case "$option" in
  "h" | "help" )
    version
    echo
    usage 0
    ;;
  "definitions" )
    list_definitions
    exit 0
    ;;
  "k" | "keep" )
    KEEP_BUILD_PATH=true
    ;;
  "v" | "verbose" )
    VERBOSE=true
    ;;
  "p" | "patch" )
    HAS_PATCH=true
    ;;
  "g" | "debug" )
    DEBUG=true
    # Disable optimization (#808)
    PYTHON_CFLAGS="-O0 ${PYTHON_CFLAGS}"
    ;;
  "4" | "ipv4")
    IPV4=true
    ;;
  "6" | "ipv6")
    IPV6=true
    ;;
  "version" )
    version
    exit 0
    ;;
  esac
done

parse_optionsで（python-build $KEEP $VERBOSE $HAS_PATCH $DEBUG "$DEFINITION" "$PREFIX" || STATUS="$?"）を処理して、OPTIONSとARGUMENTSを作成。DEBUGまでは前者で、DEFINITION以降は後者で処理される。
オプションの確認。

pyenv-build

[ "${#ARGUMENTS[@]}" -eq 2 ] || usage 1 >&2

DEFINITION_PATH="${ARGUMENTS[0]}"
if [ -z "$DEFINITION_PATH" ]; then
  usage 1 >&2
elif [ ! -f "$DEFINITION_PATH" ]; then
  for DEFINITION_DIR in "${PYTHON_BUILD_DEFINITIONS[@]}"; do
    if [ -f "${DEFINITION_DIR}/${DEFINITION_PATH}" ]; then
      DEFINITION_PATH="${DEFINITION_DIR}/${DEFINITION_PATH}"
      break
    fi
  done

  if [ ! -f "$DEFINITION_PATH" ]; then
    echo "python-build: definition not found: ${DEFINITION_PATH}" >&2
    exit 2
  fi
fi

ARGUMENTSの最初は、DEFINITION_PATH。
DEFINITIONは3.7.0であったが、ここで、
DEFINITION_PATHは、DEFINITION_PATH=/usr/local/Cellar/pyenv/2.3.1/plugins/python-build/bin/../share/python-build/3.7.0となる。

pyenv-build

PREFIX_PATH="${ARGUMENTS[1]}"
if [ -z "$PREFIX_PATH" ]; then
  usage 1 >&2
elif [ "${PREFIX_PATH#/}" = "$PREFIX_PATH" ]; then
  PREFIX_PATH="${PWD}/${PREFIX_PATH}"
fi

ARGUMENTSの2番目は、PREFIX_PATH。

pyenv-build

if [ -z "$MAKE" ]; then
  if [ "FreeBSD" = "$(uname -s)" ]; then
    if [ "$(echo $1 | sed 's/-.*$//')" = "jruby" ]; then
      export MAKE="gmake"
    else
      if [ "$(uname -r | sed 's/[^[:digit:]].*//')" -lt 10 ]; then
        export MAKE="gmake"
      else
        export MAKE="make"
      fi
    fi
  else
    export MAKE="make"
  fi
fi

makeコマンドの指定。

pyenv-build

if [ -z "$PYTHON_BUILD_MIRROR_URL" ]; then
  PYTHON_BUILD_MIRROR_URL="https://pyenv.github.io/pythons"
  PYTHON_BUILD_DEFAULT_MIRROR=1
else
  PYTHON_BUILD_MIRROR_URL="${PYTHON_BUILD_MIRROR_URL%/}"
  PYTHON_BUILD_DEFAULT_MIRROR=
fi

ミラーサイトの指定。

pyenv-build

ARIA2_OPTS="${PYTHON_BUILD_ARIA2_OPTS} ${IPV4+--disable-ipv6=true} ${IPV6+--disable-ipv6=false}"
CURL_OPTS="${PYTHON_BUILD_CURL_OPTS} ${IPV4+--ipv4} ${IPV6+--ipv6}"
WGET_OPTS="${PYTHON_BUILD_WGET_OPTS} ${IPV4+--inet4-only} ${IPV6+--inet6-only}"

curl,wget等のオプションの指定。

pyenv-build

# Add an option to build a debug version of Python (#11)
if [ -n "$DEBUG" ]; then
  package_option python configure --with-pydebug
fi

# python-build: Specify `--libdir` on configure to fix build on openSUSE (#36)
package_option python configure --libdir="${PREFIX_PATH}/lib"

pyenv-build(package_option)

package_option() {
  local package_name="$1"
  local command_name="$2"
  local variable="$(capitalize "${package_name}_${command_name}")_OPTS_ARRAY"
  local array="$variable[@]"
  shift 2
  local value=( "${!array}" "$@" )
  eval "$variable=( \"\${value[@]}\" )"
}

configureオプションを指定。

pyenv-build

# python-build: Set `RPATH` if `--enable-shared` was given (#65, #66, #82)
if [[ "$CONFIGURE_OPTS $PYTHON_CONFIGURE_OPTS" == *"--enable-shared"* ]]; then
  # The ld on Darwin embeds the full paths to each dylib by default
  if [[ "$LDFLAGS" != *"-rpath="* ]] && ! is_mac; then
    export LDFLAGS="-Wl,-rpath=${PREFIX_PATH}/lib ${LDFLAGS}"
  fi
fi

# python-build: Set `RPATH` if --shared` was given for PyPy (#244)
if [[ "$PYPY_OPTS" == *"--shared"* ]]; then
  export LDFLAGS="-Wl,-rpath=${PREFIX_PATH}/lib ${LDFLAGS}"
fi

LDFLAGSの指定。

pyenv-build

SEED="$(date "+%Y%m%d%H%M%S").$$"
LOG_PATH="${TMP}/python-build.${SEED}.log"
PYTHON_BIN="${PREFIX_PATH}/bin/python$(python_bin_suffix "${DEFINITION_PATH##*/}")"
CWD="$(pwd)"

if [ -z "$PYTHON_BUILD_BUILD_PATH" ]; then
  BUILD_PATH="${TMP}/python-build.${SEED}"
else
  BUILD_PATH="$PYTHON_BUILD_BUILD_PATH"
fi

BUILD_PATHの指定。

pyenv-build

export LDFLAGS="-L${PREFIX_PATH}/lib ${LDFLAGS}"
export CPPFLAGS="-I${PREFIX_PATH}/include ${CPPFLAGS}"

LDFLAGSおよびCPPFLAGSの指定。

trap build_failed ERR
mkdir -p "$BUILD_PATH"
source "$DEFINITION_PATH"
[ -z "${KEEP_BUILD_PATH}" ] && rm -fr "$BUILD_PATH"
trap - ERR

source "$DEFINITION_PATH"ここが本体

`/usr/local/Cellar/pyenv/2.3.1/plugins/python-build/bin/../share/python-build/3.7.0`

今回は、3.7.0を例に見る。

#require_gcc
prefer_openssl11
export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL=1
install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
if has_tar_xz_support; then
  install_package "Python-3.7.0" "https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz#0382996d1ee6aafe59763426cf0139ffebe36984474d0ec4126dd1c40a8b3549" standard verify_py37 copy_python_gdb ensurepip
else
  install_package "Python-3.7.0" "https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz#85bb9feb6863e04fb1700b018d9d42d1caac178559ffa453d7e6a436e259fd0d" standard verify_py37 copy_python_gdb ensurepip
fi

気になるのはinstall_packageである。

再び`/usr/local/opt/pyenv/bin/python-build`

install_package() {
  install_package_using "tarball" 1 "$@"
}
...
install_package_using() {
  local package_type="$1"
  local package_type_nargs="$2"
  local package_name="$3"
  shift 3

  local fetch_args=( "$package_name" "${@:1:$package_type_nargs}" )
  local make_args=( "$package_name" )
  local arg last_arg

  for arg in "${@:$(( $package_type_nargs + 1 ))}"; do
    if [ "$last_arg" = "--if" ]; then
      "$arg" || return 0
    elif [ "$arg" != "--if" ]; then
      make_args["${#make_args[@]}"]="$arg"
    fi
    last_arg="$arg"
  done

  pushd "$BUILD_PATH" >&4
  "fetch_${package_type}" "${fetch_args[@]}"
  make_package "${make_args[@]}"
  popd >&4

  { echo "Installed ${package_name} to ${PREFIX_PATH}"
    echo
  } >&2
}
...
make_package() {
  local package_name="$1"
  shift

  pushd "$package_name" >&4
  setup_builtin_patches "$package_name"
  before_install_package "$package_name"
  build_package "$package_name" $*
  after_install_package "$package_name"
  cleanup_builtin_patches "$package_name"
  fix_directory_permissions
  popd >&4
}

build_packageは、build_package_standard Python-3.7.0を結局は呼ぶことになる。

# Backward Compatibility for standard functionbuild_package_standard() {
  build_package_standard_build "$@"
  build_package_standard_install "$@"
}
...
build_package_standard_build() {
  local package_name="$1"

  if [ "${MAKEOPTS+defined}" ]; then
    MAKE_OPTS="$MAKEOPTS"
  elif [ -z "${MAKE_OPTS+defined}" ]; then
    MAKE_OPTS="-j $(num_cpu_cores)"
  fi

  # Support YAML_CONFIGURE_OPTS, PYTHON_CONFIGURE_OPTS, etc.
  local package_var_name="$(capitalize "${package_name%%-*}")"
  local PACKAGE_CONFIGURE="${package_var_name}_CONFIGURE"
  local PACKAGE_PREFIX_PATH="${package_var_name}_PREFIX_PATH"
  local PACKAGE_CONFIGURE_OPTS="${package_var_name}_CONFIGURE_OPTS"
  local PACKAGE_CONFIGURE_OPTS_ARRAY="${package_var_name}_CONFIGURE_OPTS_ARRAY[@]"
  local PACKAGE_MAKE_OPTS="${package_var_name}_MAKE_OPTS"
  local PACKAGE_MAKE_OPTS_ARRAY="${package_var_name}_MAKE_OPTS_ARRAY[@]"
  local PACKAGE_CFLAGS="${package_var_name}_CFLAGS"

  if [ "$package_var_name" = "PYTHON" ]; then
    use_homebrew || true
    use_tcltk || true
    use_homebrew_readline || use_freebsd_pkg || true
    if is_mac -ge 1014; then
      use_xcode_sdk_zlib || use_homebrew_zlib || true
    else
      use_homebrew_zlib || true
    fi
  fi

  ( if [ "${CFLAGS+defined}" ] || [ "${!PACKAGE_CFLAGS+defined}" ]; then
      export CFLAGS="$CFLAGS ${!PACKAGE_CFLAGS}"
    fi
    if [ -z "$CC" ] && is_mac -ge 1010; then
      export CC=clang
    fi
    ${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" \
      $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}" || return 1
  ) >&4 2>&1

  { "$MAKE" $MAKE_OPTS ${!PACKAGE_MAKE_OPTS} "${!PACKAGE_MAKE_OPTS_ARRAY}"
  } >&4 2>&1
}

build_package_standard_install() {
  local package_name="$1"
  local package_var_name="$(capitalize "${package_name%%-*}")"

  local PACKAGE_MAKE_INSTALL_OPTS="${package_var_name}_MAKE_INSTALL_OPTS"
  local PACKAGE_MAKE_INSTALL_OPTS_ARRAY="${package_var_name}_MAKE_INSTALL_OPTS_ARRAY[@]"
  local PACKAGE_MAKE_INSTALL_TARGET="${package_var_name}_MAKE_INSTALL_TARGET"

  { "$MAKE" "${!PACKAGE_MAKE_INSTALL_TARGET:-install}" $MAKE_INSTALL_OPTS ${!PACKAGE_MAKE_INSTALL_OPTS} "${!PACKAGE_MAKE_INSTALL_OPTS_ARRAY}"
  } >&4 2>&1
}

なお、configureは、上記の

${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" \
      $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}"

で行われる。（飽きた）
./configure --prefix=/Users/yo314159265/.pyenv/versions/3.7.0 --libdir=/Users/yo314159265/.pyenv/versions/3.7.0/lib --with-openssl=/usr/local/opt/openssl@1.1 '--with-tcltk-libs=-L/usr/local/opt/tcl-tk/lib -ltcl8.6 -ltk8.6' --with-tcltk-includes=-I/usr/local/opt/tcl-tk/include
ちゃんと、目的の場所--prefix=に出力されることがわかる。
また、makeは、上記の

{ "$MAKE" $MAKE_OPTS ${!PACKAGE_MAKE_OPTS} "${!PACKAGE_MAKE_OPTS_ARRAY}"
  }

で行われる。
make -j 8

感想

pyenv --debug install 3.7.0で結果を追う知恵がついたので、僕は進歩できたと思う。