mirror_zfs/config/always-python.m4
Ryan Moeller 1a132f0638 Make Python detection optional and more portable
Previously, --without-python would cause ./configure to fail. Now it is
able to proceed, and the Python scripts will not be built.

Use portable parameter expansion matching instead of nonstandard
substring matching to detect the Python version.  This test is
duplicated in several places, so define a function for it.

Don't assume the full path to binaries, since different platforms do
install things in different places.  Use AC_CHECK_PROGS instead.

When building without Python, also build without pyzfs.

Sponsored by: iXsystems, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Ryan Moeller <ryan@freqlabs.com>
Closes #8809 
Closes #8731
2019-06-04 18:05:46 -07:00

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dnl #
dnl # ZFS_AC_PYTHON_VERSION(version, [action-if-true], [action-if-false])
dnl #
dnl # Verify Python version
dnl #
AC_DEFUN([ZFS_AC_PYTHON_VERSION], [
ver_check=`$PYTHON -c "import sys; print (sys.version.split()[[0]] $1)"`
AS_IF([test "$ver_check" = "True"], [
m4_ifvaln([$2], [$2])
], [
m4_ifvaln([$3], [$3])
])
])
dnl #
dnl # ZFS_AC_PYTHON_VERSION_IS_2
dnl # ZFS_AC_PYTHON_VERSION_IS_3
dnl #
dnl # Tests if the $PYTHON_VERSION matches 2.x or 3.x.
dnl #
AC_DEFUN([ZFS_AC_PYTHON_VERSION_IS_2],
[test "${PYTHON_VERSION%%\.*}" = "2"])
AC_DEFUN([ZFS_AC_PYTHON_VERSION_IS_3],
[test "${PYTHON_VERSION%%\.*}" = "3"])
dnl #
dnl # ZFS_AC_PYTHON_MODULE(module_name, [action-if-true], [action-if-false])
dnl #
dnl # Checks for Python module. Freely inspired by AX_PYTHON_MODULE
dnl # https://www.gnu.org/software/autoconf-archive/ax_python_module.html
dnl # Required by ZFS_AC_CONFIG_ALWAYS_PYZFS.
dnl #
AC_DEFUN([ZFS_AC_PYTHON_MODULE], [
PYTHON_NAME=`basename $PYTHON`
AC_MSG_CHECKING([for $PYTHON_NAME module: $1])
AS_IF([$PYTHON -c "import $1" 2>/dev/null], [
AC_MSG_RESULT(yes)
m4_ifvaln([$2], [$2])
], [
AC_MSG_RESULT(no)
m4_ifvaln([$3], [$3])
])
])
dnl #
dnl # The majority of the python scripts are written to be compatible
dnl # with Python 2.6 and Python 3.4. Therefore, they may be installed
dnl # and used with either interpreter. This option is intended to
dnl # to provide a method to specify the default system version, and
dnl # set the PYTHON environment variable accordingly.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_PYTHON], [
AC_ARG_WITH([python],
AC_HELP_STRING([--with-python[=VERSION]],
[default system python version @<:@default=check@:>@]),
[with_python=$withval],
[with_python=check])
AS_CASE([$with_python],
[check], [AC_CHECK_PROGS([PYTHON], [python3 python2], [:])],
[2*], [PYTHON="python${with_python}"],
[*python2*], [PYTHON="${with_python}"],
[3*], [PYTHON="python${with_python}"],
[*python3*], [PYTHON="${with_python}"],
[no], [PYTHON=":"],
[AC_MSG_ERROR([Unknown --with-python value '$with_python'])]
)
AS_IF([test $PYTHON != :], [
AS_IF([$PYTHON --version >/dev/null 2>&1],
[AM_PATH_PYTHON([2.6], [], [:])],
[AC_MSG_ERROR([Cannot find $PYTHON in your system path])]
)
])
AM_CONDITIONAL([USING_PYTHON], [test "$PYTHON" != :])
AM_CONDITIONAL([USING_PYTHON_2], [ZFS_AC_PYTHON_VERSION_IS_2])
AM_CONDITIONAL([USING_PYTHON_3], [ZFS_AC_PYTHON_VERSION_IS_3])
dnl #
dnl # Minimum supported Python versions for utilities:
dnl # Python 2.6.x, or Python 3.4.x
dnl #
AS_IF([ZFS_AC_PYTHON_VERSION_IS_2], [
ZFS_AC_PYTHON_VERSION([>= '2.6'], [ true ],
[AC_MSG_ERROR("Python >= 2.6.x is not available")])
])
AS_IF([ZFS_AC_PYTHON_VERSION_IS_3], [
ZFS_AC_PYTHON_VERSION([>= '3.4'], [ true ],
[AC_MSG_ERROR("Python >= 3.4.x is not available")])
])
dnl #
dnl # Request that packages be built for a specific Python version.
dnl #
AS_IF([test $with_python != check], [
PYTHON_PKG_VERSION=`echo ${PYTHON} | tr -d 'a-zA-Z.'`
DEFINE_PYTHON_PKG_VERSION='--define "__use_python_pkg_version '${PYTHON_PKG_VERSION}'"'
DEFINE_PYTHON_VERSION='--define "__use_python '${PYTHON}'"'
], [
DEFINE_PYTHON_VERSION=''
DEFINE_PYTHON_PKG_VERSION=''
])
AC_SUBST(DEFINE_PYTHON_VERSION)
AC_SUBST(DEFINE_PYTHON_PKG_VERSION)
])