Python3: replace `distutils` with `sysconfig`

- `distutils` module is long time deprecated and already deleted
  from the CPython mainline.

- To remain compatible with Debian/Ubuntu Python3 packaging style,
  try
  `distutils.sysconfig.get_python_path(0,0)`
  first with fallback on
  `sysconfig.get_path('purelib')`

- pyzfs_unittest suite is run unconditionally as a part of ZTS.

- Add pyzfs_unittest suite to sanity tests.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #12833 
Closes #13280 
Closes #14177

config/ax_python_devel.m4

@@ -165,31 +165,16 @@ variable to configure. See ``configure --help'' for reference.
 		fi
 	fi
 
-	#
-	# Check if you have distutils, else fail
-	#
-	AC_MSG_CHECKING([for the distutils Python package])
-	if ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`; then
-		AC_MSG_RESULT([yes])
-	else
-		AC_MSG_RESULT([no])
-		m4_ifvaln([$2],[$2],[
-			AC_MSG_ERROR([cannot import Python module "distutils".
-Please check your Python installation. The error was:
-$ac_distutils_result])
-			PYTHON_VERSION=""
-		])
-	fi
-
 	#
 	# Check for Python include path
 	#
+	#
 	AC_MSG_CHECKING([for Python include path])
 	if test -z "$PYTHON_CPPFLAGS"; then
-		python_path=`$PYTHON -c "import distutils.sysconfig; \
+		python_path=`$PYTHON -c "import sysconfig; \
-			print (distutils.sysconfig.get_python_inc ());"`
+			print (sysconfig.get_path('include'));"`
-		plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
+		plat_python_path=`$PYTHON -c "import sysconfig; \
-			print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
+			print (sysconfig.get_path('platinclude'));"`
 		if test -n "${python_path}"; then
 			if test "${plat_python_path}" != "${python_path}"; then
 				python_path="-I$python_path -I$plat_python_path"
@@ -213,7 +198,7 @@ $ac_distutils_result])
 
 # join all versioning strings, on some systems
 # major/minor numbers could be in different list elements
-from distutils.sysconfig import *
+from sysconfig import *
 e = get_config_var('VERSION')
 if e is not None:
 	print(e)
@@ -236,8 +221,8 @@ EOD`
 		ac_python_libdir=`cat<<EOD | $PYTHON -
 
 # There should be only one
-import distutils.sysconfig
+import sysconfig
-e = distutils.sysconfig.get_config_var('LIBDIR')
+e = sysconfig.get_config_var('LIBDIR')
 if e is not None:
 	print (e)
 EOD`
@@ -245,8 +230,8 @@ EOD`
 		# Now, for the library:
 		ac_python_library=`cat<<EOD | $PYTHON -
 
-import distutils.sysconfig
+import sysconfig
-c = distutils.sysconfig.get_config_vars()
+c = sysconfig.get_config_vars()
 if 'LDVERSION' in c:
 	print ('python'+c[['LDVERSION']])
 else:
@@ -265,9 +250,9 @@ EOD`
 		else
 			# old way: use libpython from python_configdir
 			ac_python_libdir=`$PYTHON -c \
-			  "from distutils.sysconfig import get_python_lib as f; \
+			  "import sysconfig; \
 			  import os; \
-			  print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
+			  print (os.path.join(sysconfig.get_path('platstdlib'), 'config'));"`
 			PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
 		fi
 
@@ -289,7 +274,9 @@ EOD`
 	AC_MSG_CHECKING([for Python site-packages path])
 	if test -z "$PYTHON_SITE_PKG"; then
 		PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
-			print (distutils.sysconfig.get_python_lib(0,0));"`
+			print (distutils.sysconfig.get_python_lib(0,0));" 2>/dev/null || \
+			$PYTHON -c "import sysconfig; \
+			print (sysconfig.get_path('purelib'));"`
 	fi
 	AC_MSG_RESULT([$PYTHON_SITE_PKG])
 	AC_SUBST([PYTHON_SITE_PKG])
@@ -299,8 +286,8 @@ EOD`
 	#
 	AC_MSG_CHECKING(python extra libraries)
 	if test -z "$PYTHON_EXTRA_LIBS"; then
-	   PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
+	   PYTHON_EXTRA_LIBS=`$PYTHON -c "import sysconfig; \
-                conf = distutils.sysconfig.get_config_var; \
+                conf = sysconfig.get_config_var; \
                 print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
 	fi
 	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
@@ -311,8 +298,8 @@ EOD`
 	#
 	AC_MSG_CHECKING(python extra linking flags)
 	if test -z "$PYTHON_EXTRA_LDFLAGS"; then
-		PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
+		PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import sysconfig; \
-			conf = distutils.sysconfig.get_config_var; \
+			conf = sysconfig.get_config_var; \
 			print (conf('LINKFORSHARED'))"`
 	fi
 	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])

rpm/generic/zfs.spec.in

@@ -78,7 +78,7 @@
 %define __python                  %{__use_python}
 %define __python_pkg_version      %{__use_python_pkg_version}
 %endif
-%define __python_sitelib          %(%{__python} -Esc "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
+%define __python_sitelib          %(%{__python} -Esc "from distutils.sysconfig import get_python_lib; print(get_python_lib())" 2>/dev/null || %{__python} -Esc "import sysconfig; print(sysconfig.get_path('purelib'))")
 
 Name:           @PACKAGE@
 Version:        @VERSION@

tests/runfiles/sanity.run

@@ -624,3 +624,7 @@ tags = ['functional', 'zvol', 'zvol_swap']
 [tests/functional/zpool_influxdb]
 tests = ['zpool_influxdb']
 tags = ['functional', 'zpool_influxdb']
+
+[tests/functional/pyzfs]
+tests = ['pyzfs_unittest']
+tags = ['functional', 'pyzfs']

tests/test-runner/bin/zts-report.py.in

@@ -61,14 +61,6 @@ known_reason = 'Known issue'
 #
 exec_reason = 'Test user execute permissions required for utilities'
 
-#
-# Some tests require a minimum python version of 3.6 and will be skipped when
-# the default system version is too old.  There may also be tests which require
-# additional python modules be installed, for example python3-cffi is required
-# by the pyzfs tests.
-#
-python_deps_reason = 'Python modules missing: python3-cffi'
-
 #
 # Some tests require that the kernel supports renameat2 syscall.
 #
@@ -232,7 +224,6 @@ maybe = {
     'io/mmap': ['SKIP', fio_reason],
     'largest_pool/largest_pool_001_pos': ['FAIL', known_reason],
     'mmp/mmp_on_uberblocks': ['FAIL', known_reason],
-    'pyzfs/pyzfs_unittest': ['SKIP', python_deps_reason],
     'pool_checkpoint/checkpoint_discard_busy': ['FAIL', 11946],
     'projectquota/setup': ['SKIP', exec_reason],
     'removal/removal_condense_export': ['FAIL', known_reason],

tests/zfs-tests/tests/functional/pyzfs/pyzfs_unittest.ksh.in

@@ -18,6 +18,8 @@
 
 if [ -n "$ASAN_OPTIONS" ]; then
 	export LD_PRELOAD=$(ldd "$(command -v zfs)" | awk '/libasan\.so/ {print $3}')
+	# ASan reports leaks in CPython 3.10
+	ASAN_OPTIONS="$ASAN_OPTIONS:detect_leaks=false"
 fi
 
 #
@@ -30,20 +32,6 @@ fi
 #
 
 verify_runnable "global"
-
-# Verify that the required dependencies for testing are installed.
-@PYTHON@ -c "import cffi" 2>/dev/null ||
-	log_unsupported "python3-cffi not found by Python"
-
-# We don't just try to "import libzfs_core" because we want to skip these tests
-# only if pyzfs was not installed due to missing, build-time, dependencies; if
-# we cannot load "libzfs_core" due to other reasons, for instance an API/ABI
-# mismatch, we want to report it.
-@PYTHON@ -c '
-import pkgutil, sys
-sys.exit(pkgutil.find_loader("libzfs_core") is None)' ||
-	log_unsupported "libzfs_core not found by Python"
-
 log_assert "Verify the nvlist and libzfs_core Python unittest run successfully"
 
 # log_must buffers stderr, which interacts badly with