Removed Python 2 and Python 3.5- support

Deprecation of Python versions below 3.6 gives opportunity to unify the
build and install requirements for OpenZFS packages. The minimal
supported Python version is 3.6 as this is the most recent Python
package CentOS/RHEL 7 users can get.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #12925

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

@@ -15,19 +15,14 @@
 # Copyright (c) 2012, 2018 by Delphix. All rights reserved.
 # Copyright (c) 2019 Datto Inc.
 #
-# This script must remain compatible with Python 2.6+ and Python 3.4+.
+# This script must remain compatible with Python 3.6+.
 #
 
-# some python 2.7 system don't have a configparser shim
-try:
-    import configparser
-except ImportError:
-    import ConfigParser as configparser
-
 import os
 import sys
 import ctypes
 import re
+import configparser
 
 from datetime import datetime
 from optparse import OptionParser
@@ -38,7 +33,7 @@ from subprocess import PIPE
 from subprocess import Popen
 from subprocess import check_output
 from threading import Timer
-from time import time
+from time import time, CLOCK_MONOTONIC_RAW
 from os.path import exists
 
 BASEDIR = '/var/tmp/test_results'
@@ -52,9 +47,6 @@ LOG_OUT = 'LOG_OUT'
 LOG_ERR = 'LOG_ERR'
 LOG_FILE_OBJ = None
 
-# some python 2.7 system don't have a concept of monotonic time
-CLOCK_MONOTONIC_RAW = 4  # see <linux/time.h>
-
 
 class timespec(ctypes.Structure):
     _fields_ = [

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

@@ -15,7 +15,7 @@
 # Copyright (c) 2017 by Delphix. All rights reserved.
 # Copyright (c) 2018 by Lawrence Livermore National Security, LLC.
 #
-# This script must remain compatible with Python 2.6+ and Python 3.4+.
+# This script must remain compatible with Python 3.6+.
 #
 
 import os
@@ -62,13 +62,13 @@ known_reason = 'Known issue'
 exec_reason = 'Test user execute permissions required for utilities'
 
 #
-# Some tests require a minimum python version of 3.5 and will be skipped when
+# 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 python-cffi is required
+# additional python modules be installed, for example python3-cffi is required
 # by the pyzfs tests.
 #
-python_reason = 'Python v3.5 or newer required'
-python_deps_reason = 'Python modules missing: python-cffi'
+python_reason = 'Python v3.6 or newer required'
+python_deps_reason = 'Python modules missing: python3-cffi'
 
 #
 # Some tests require the O_TMPFILE flag which was first introduced in the

tests/zfs-tests/include/commands.cfg

@@ -70,8 +70,6 @@ export SYSTEM_FILES_COMMON='arp
     printf
     ps
     pwd
-    python
-    python2
     python3
     quotaon
     readlink

tests/zfs-tests/tests/functional/cli_root/zfs_program/zfs_program_json.ksh

@@ -92,27 +92,13 @@ typeset -a pos_cmds_out=(
     }
 }")
 
-#
-# N.B. json.tool is needed to guarantee consistent ordering of fields,
-# sed is needed to trim trailing space in CentOS 6's json.tool output
-#
-# As of Python 3.5 the behavior of json.tool changed to keep the order
-# the same as the input and the --sort-keys option was added.  Detect when
-# --sort-keys is supported and apply the option to ensure the expected order.
-#
-if python -m json.tool --sort-keys <<< "{}"; then
-	JSON_TOOL_CMD="python -m json.tool --sort-keys"
-else
-	JSON_TOOL_CMD="python -m json.tool"
-fi
-
 typeset -i cnt=0
 typeset cmd
 for cmd in ${pos_cmds[@]}; do
 	log_must zfs program $TESTPOOL $TESTZCP $TESTDS $cmd 2>&1
 	log_must zfs program -j $TESTPOOL $TESTZCP $TESTDS $cmd 2>&1
 	OUTPUT=$(zfs program -j $TESTPOOL $TESTZCP $TESTDS $cmd 2>&1 |
-	    $JSON_TOOL_CMD | sed 's/[[:space:]]*$//')
+	    python3 -m json.tool --sort-keys)
 	if [ "$OUTPUT" != "${pos_cmds_out[$cnt]}" ]; then
 		log_note "Got     :$OUTPUT"
 		log_note "Expected:${pos_cmds_out[$cnt]}"

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

@@ -30,7 +30,7 @@ verify_runnable "global"
 # Verify that the required dependencies for testing are installed.
 @PYTHON@ -c "import cffi" 2>/dev/null
 if [ $? -eq 1 ]; then
-	log_unsupported "python-cffi not found by Python"
+	log_unsupported "python3-cffi not found by Python"
 fi
 
 # We don't just try to "import libzfs_core" because we want to skip these tests

tests/zfs-tests/tests/functional/rsend/send_encrypted_files.ksh

@@ -87,7 +87,7 @@ log_must xattrtest -f 10 -x 3 -s 32768 -r -k -p /$TESTPOOL/$TESTFS2/xattrsadir
 # OpenZFS issue #7432
 log_must zfs set compression=on xattr=sa $TESTPOOL/$TESTFS2
 log_must touch /$TESTPOOL/$TESTFS2/attrs
-log_must eval "python -c 'print \"a\" * 4096' | \
+log_must eval "python3 -c 'print \"a\" * 4096' | \
 	set_xattr_stdin bigval /$TESTPOOL/$TESTFS2/attrs"
 log_must zfs set compression=off xattr=on $TESTPOOL/$TESTFS2
 

tests/zfs-tests/tests/functional/rsend/send_realloc_dnode_size.ksh

@@ -88,7 +88,7 @@ log_must zfs snapshot $POOL/fs@c
 # 4. Create an empty file and add xattrs to it to exercise reclaiming a
 #    dnode that requires more than 1 slot for its bonus buffer (Zol #7433)
 log_must zfs set compression=on xattr=sa $POOL/fs
-log_must eval "python -c 'print \"a\" * 512' |
+log_must eval "python3 -c 'print \"a\" * 512' |
     set_xattr_stdin bigval /$POOL/fs/attrs"
 log_must zfs snapshot $POOL/fs@d