meson/meson-restore-python3.4.patch

--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -32,7 +32,7 @@ from .. import compilers
 from ..compilers import CompilerArgs, CCompiler
 from ..linkers import ArLinker
 from ..mesonlib import File, MesonException, OrderedSet
-from ..mesonlib import get_compiler_for_source, has_path_sep
+from ..mesonlib import get_compiler_for_source, has_path_sep, commonpath
 from .backends import CleanTrees
 from ..build import InvalidArguments
 
@@ -1011,8 +1011,8 @@ int dummy;
                 # Check if the vala file is in a subdir of --basedir
                 abs_srcbasedir = os.path.join(self.environment.get_source_dir(), target.get_subdir())
                 abs_vala_file = os.path.join(self.environment.get_build_dir(), vala_file)
-                if PurePath(os.path.commonpath((abs_srcbasedir, abs_vala_file))) == PurePath(abs_srcbasedir):
-                    vala_c_subdir = PurePath(abs_vala_file).parent.relative_to(abs_srcbasedir)
+                if PurePath(commonpath((abs_srcbasedir, abs_vala_file))) == PurePath(abs_srcbasedir):
+                    vala_c_subdir = str(PurePath(abs_vala_file).parent.relative_to(abs_srcbasedir))
                     vala_c_file = os.path.join(str(vala_c_subdir), vala_c_file)
             else:
                 path_to_target = os.path.join(self.build_to_src, target.get_subdir())
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -18,7 +18,7 @@ import sys
 from pathlib import PurePath
 from collections import OrderedDict
 from .mesonlib import MesonException
-from .mesonlib import default_libdir, default_libexecdir, default_prefix
+from .mesonlib import default_libdir, default_libexecdir, default_prefix, commonpath
 from .wrap import WrapMode
 import ast
 import argparse
@@ -302,7 +302,7 @@ class CoreData:
             # commonpath will always return a path in the native format, so we
             # must use pathlib.PurePath to do the same conversion before
             # comparing.
-            if os.path.commonpath([value, prefix]) != str(PurePath(prefix)):
+            if commonpath([value, prefix]) != str(PurePath(prefix)):
                 m = 'The value of the {!r} option is {!r} which must be a ' \
                     'subdir of the prefix {!r}.\nNote that if you pass a ' \
                     'relative path, it is assumed to be a subdir of prefix.'
--- a/mesonbuild/interpreterbase.py
+++ b/mesonbuild/interpreterbase.py
@@ -574,7 +574,9 @@ The result of this is undefined and will
 
         if cur.operation == 'add':
             if isinstance(l, dict) and isinstance(r, dict):
-                return {**l, **r}
+                ret = l.copy()
+                ret.update(r)
+                return ret
             try:
                 return l + r
             except Exception as e:
@@ -661,7 +662,8 @@ The result of this is undefined and will
         elif isinstance(old_variable, dict):
             if not isinstance(addition, dict):
                 raise InvalidArguments('The += operator requires a dict on the right hand side if the variable on the left is a dict')
-            new_value = {**old_variable, **addition}
+            new_value = old_variable.copy()
+            new_value.update(addition)
         # Add other data types here.
         else:
             raise InvalidArguments('The += operator currently only works with arrays, dicts, strings or ints ')
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -19,7 +19,8 @@ import sys
 import stat
 import time
 import platform, subprocess, operator, os, shutil, re
-import collections
+import collections
+import collections.abc
 from mesonbuild import mlog
 
 have_fcntl = False
@@ -1062,6 +1062,30 @@ def substring_is_in_list(substr, strlist
             return True
     return False
 
+def commonpath(paths):
+    '''
+    For use on Python 3.4 where os.path.commonpath is not available.
+    '''
+    if sys.version_info >= (3, 5):
+        return os.path.commonpath(paths)
+
+    import pathlib
+    if not paths:
+        raise ValueError('commonpath() arg is an empty sequence')
+    common = pathlib.PurePath(paths[0])
+    for path in paths[1:]:
+        new = []
+        path = pathlib.PurePath(path)
+        for c, p in zip(common.parts, path.parts):
+            if c != p:
+                break
+            new.append(c)
+        if not new:
+            raise ValueError("Can't mix absolute and relative paths") from None
+        new = os.path.join(*new)
+        common = pathlib.PurePath(new)
+    return str(common)
+
 class OrderedSet(collections.abc.MutableSet):
     """A set that preserves the order in which items are added, by first
     insertion.
--- a/mesonbuild/mesonmain.py
+++ b/mesonbuild/mesonmain.py
@@ -269,8 +269,8 @@ def set_meson_command(mainfile):
         mlog.log('meson_command is {!r}'.format(mesonlib.meson_command))
 
 def run(original_args, mainfile):
-    if sys.version_info < (3, 5):
-        print('Meson works correctly only with python 3.5+.')
+    if sys.version_info < (3, 4):
+        print('Meson works correctly only with python 3.4+.')
         print('You have python %s.' % sys.version)
         print('Please update your environment')
         return 1
--- a/mesonbuild/minstall.py
+++ b/mesonbuild/minstall.py
@@ -353,8 +353,8 @@ class Installer:
             if shutil.which('pkexec') is not None and 'PKEXEC_UID' not in os.environ:
                 print('Installation failed due to insufficient permissions.')
                 print('Attempting to use polkit to gain elevated privileges...')
-                os.execlp('pkexec', 'pkexec', sys.executable, main_file, *sys.argv[1:],
-                          '-C', os.getcwd())
+                os.execvp('pkexec', ['pkexec', sys.executable, main_file] + sys.argv[1:] +
+                          ['-C', os.getcwd()])
             else:
                 raise
 
--- a/mesonbuild/modules/python.py
+++ b/mesonbuild/modules/python.py
@@ -512,7 +512,7 @@ class PythonModule(ExtensionModule):
             # Sanity check, we expect to have something that at least quacks in tune
             try:
                 info = json.loads(run_command(python, INTROSPECT_COMMAND))
-            except json.JSONDecodeError:
+            except ValueError:
                 info = None
 
             if isinstance(info, dict) and 'version' in info and self._check_version(name_or_path, info['version']):
--- a/mesonbuild/mtest.py
+++ b/mesonbuild/mtest.py
@@ -115,7 +115,12 @@ def returncode_to_status(retcode):
     if retcode < 0:
         signum = -retcode
         try:
-            signame = signal.Signals(signum).name
+            if sys.version_info >= (3, 5):
+                signame = signal.Signals(signum).name
+            else:
+                try: signame = [next(n for n, i in signal.__dict__.items()
+                                     if i == signum)]
+                except StopIteration: raise ValueError
         except ValueError:
             signame = 'SIGinvalid'
         return '(killed by signal %d %s)' % (signum, signame)
@@ -125,7 +130,12 @@ def returncode_to_status(retcode):
 
     signum = retcode - 128
     try:
-        signame = signal.Signals(signum).name
+        if sys.version_info >= (3, 5):
+            signame = signal.Signals(signum).name
+        else:
+            try: signame = [next(n for n, i in signal.__dict__.items()
+                                 if i == signum)]
+            except StopIteration: raise ValueError
     except ValueError:
         signame = 'SIGinvalid'
     return '(exit status %d or signal %d %s)' % (retcode, signum, signame)
--- a/mesonbuild/scripts/dist.py
+++ b/mesonbuild/scripts/dist.py
@@ -87,8 +87,8 @@ def run_dist_scripts(dist_root, dist_scr
                              silent=True)
         if not ep.found():
             sys.exit('Script %s could not be found in dist directory.' % d)
-        pc = subprocess.run(ep.command, env=env)
-        if pc.returncode != 0:
+        pc = subprocess.call(ep.command, env=env)
+        if pc != 0:
             sys.exit('Dist script errored out.')
 
 def create_dist_git(dist_name, src_root, bld_root, dist_sub, dist_scripts):
--- a/mesonbuild/scripts/gtkdochelper.py
+++ b/mesonbuild/scripts/gtkdochelper.py
@@ -17,7 +17,7 @@ import subprocess
 import shlex
 import shutil
 import argparse
-from ..mesonlib import MesonException, Popen_safe, is_windows
+from ..mesonlib import MesonException, Popen_safe, is_windows, commonpath
 from . import destdir_join
 
 parser = argparse.ArgumentParser()
@@ -107,7 +107,7 @@ def build_gtkdoc(source_root, build_root
         # FIXME: Use mesonlib.File objects so we don't need to do this
         if not os.path.isabs(f):
             f = os.path.join(doc_src, f)
-        elif os.path.commonpath([f, build_root]) == build_root:
+        elif commonpath([f, build_root]) == build_root:
             continue
         shutil.copyfile(f, os.path.join(abs_out, os.path.basename(f)))
 
--- a/run_meson_command_tests.py
+++ b/run_meson_command_tests.py
@@ -18,6 +18,7 @@ import os
 import tempfile
 import unittest
 import subprocess
+import sys
 import zipapp
 from pathlib import Path
 
@@ -73,13 +74,27 @@ class CommandTests(unittest.TestCase):
         # If this call hangs CI will just abort. It is very hard to distinguish
         # between CI issue and test bug in that case. Set timeout and fail loud
         # instead.
-        p = subprocess.run(command, stdout=subprocess.PIPE,
-                           stderr=subprocess.STDOUT, env=os.environ.copy(),
-                           universal_newlines=True, cwd=workdir, timeout=60 * 5)
-        print(p.stdout)
-        if p.returncode != 0:
-            raise subprocess.CalledProcessError(p.returncode, command)
-        return p.stdout
+        if sys.version_info >= (3, 5):
+            p = subprocess.run(command, stdout=subprocess.PIPE,
+                               stderr=subprocess.STDOUT, env=os.environ.copy(),
+                               universal_newlines=True,
+                               cwd=workdir, timeout=60 * 5)
+            print(p.stdout)
+            if p.returncode != 0:
+                raise subprocess.CalledProcessError(p.returncode, command)
+            return p.stdout
+        else:
+            try:
+                po = subprocess.check_output(command, stderr=subprocess.STDOUT,
+                                             env=os.environ.copy(),
+                                             universal_newlines=True,
+                                             cwd=workdir, timeout=60 * 5)
+            except subprocess.CalledProcessError as e:
+                print(e.output)
+                raise subprocess.CalledProcessError(e.returncode, e.cmd)
+            else:
+                print(po)
+                return po
 
     def assertMesonCommandIs(self, line, cmd):
         self.assertTrue(line.startswith('meson_command '), msg=line)
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -21,6 +21,7 @@ import tempfile
 import textwrap
 import os
 import shutil
+import sys
 import unittest
 import platform
 from itertools import chain
@@ -892,6 +893,24 @@ class DataTests(unittest.TestCase):
             defined = set([a.strip() for a in res.group().split('\\')][1:])
             self.assertEqual(defined, set(chain(interp.funcs.keys(), interp.builtin.keys())))
 
+    def test_commonpath(self):
+        from os.path import sep
+        commonpath = mesonbuild.mesonlib.commonpath
+        self.assertRaises(ValueError, commonpath, [])
+        self.assertEqual(commonpath(['/usr', '/usr']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr', '/usr/']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr', '/usr/bin']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr/', '/usr/bin']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr/./', '/usr/bin']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr/bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
+        self.assertEqual(commonpath(['/usr//bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
+        self.assertEqual(commonpath(['/usr/./bin', '/usr/bin']), sep + 'usr' + sep + 'bin')
+        self.assertEqual(commonpath(['/usr/local', '/usr/lib']), sep + 'usr')
+        self.assertEqual(commonpath(['/usr', '/bin']), sep)
+        prefix = '/some/path/to/prefix'
+        libdir = '/some/path/to/prefix/libdir'
+        self.assertEqual(commonpath([prefix, libdir]), str(PurePath(prefix)))
+
 
 class BasePlatformTests(unittest.TestCase):
     def setUp(self):
@@ -972,9 +991,16 @@ class BasePlatformTests(unittest.TestCas
         # If this call hangs CI will just abort. It is very hard to distinguish
         # between CI issue and test bug in that case. Set timeout and fail loud
         # instead.
-        p = subprocess.run(command, stdout=subprocess.PIPE,
-                           stderr=subprocess.STDOUT, env=os.environ.copy(),
-                           universal_newlines=True, cwd=workdir, timeout=60 * 5)
+        if sys.version_info >= (3, 5):
+            p = subprocess.run(command, stdout=subprocess.PIPE,
+                               stderr=subprocess.STDOUT, env=os.environ.copy(),
+                               universal_newlines=True, cwd=workdir,
+                               timeout=60 * 5)
+        else:
+            p = subprocess.Popen(command, stdout=subprocess.PIPE,
+                                 stderr=subprocess.STDOUT, env=os.environ.copy(),
+                                 universal_newlines=True, cwd=workdir)
+            p.stdout = p.communicate(timeout=60 * 5)[0]
         print(p.stdout)
         if p.returncode != 0:
             if 'MESON_SKIP_TEST' in p.stdout:
@@ -2698,17 +2724,23 @@ recommended as it is not supported on so
                 of = open(mfile, 'w')
                 of.write("project('foobar', 'c')\n")
                 of.close()
-                pc = subprocess.run(self.setup_command,
-                                    cwd=srcdir,
-                                    stdout=subprocess.PIPE,
-                                    stderr=subprocess.DEVNULL)
+                if sys.version_info >= (3, 5):
+                    pc = subprocess.run(self.setup_command,
+                                        cwd=srcdir,
+                                        stdout=subprocess.PIPE,
+                                        stderr=subprocess.DEVNULL)
+                else:
+                    pc = subprocess.Popen(self.setup_command,
+                                          cwd=srcdir,
+                                          stdout=subprocess.PIPE,
+                                          stderr=subprocess.DEVNULL)
+                    pc.stdout = pc.communicate()[0]
                 self.assertIn(b'Must specify at least one directory name', pc.stdout)
                 with tempfile.TemporaryDirectory(dir=srcdir) as builddir:
-                    subprocess.run(self.setup_command,
-                                   check=True,
-                                   cwd=builddir,
-                                   stdout=subprocess.DEVNULL,
-                                   stderr=subprocess.DEVNULL)
+                    subprocess.check_call(self.setup_command,
+                                          cwd=builddir,
+                                          stdout=subprocess.DEVNULL,
+                                          stderr=subprocess.DEVNULL)
 
     def get_opts_as_dict(self):
         result = {}
--- a/setup.py
+++ b/setup.py
@@ -18,9 +18,9 @@ import sys
 
 from mesonbuild.coredata import version
 
-if sys.version_info < (3, 5, 0):
+if sys.version_info < (3, 4, 0):
     print('Tried to install with an unsupported version of Python. '
-          'Meson requires Python 3.5.0 or greater')
+          'Meson requires Python 3.4.0 or greater')
     sys.exit(1)
 
 from setuptools import setup
--- "a/test cases/common/188 find override/subdir/converter.py"
+++ "b/test cases/common/188 find override/subdir/converter.py"
@@ -10,6 +10,7 @@ ftempl = '''int %s() {
 }
 '''
 
-d = pathlib.Path(ifilename).read_text().split('\n')[0].strip()
-
-pathlib.Path(ofilename).write_text(ftempl % d)
+with pathlib.Path(ifilename).open('r') as f:
+    d = f.readline().strip()
+with pathlib.Path(ofilename).open('w') as f:
+    f.write(ftempl % d)
--- "a/test cases/common/188 find override/subdir/gencodegen.py.in"
+++ "b/test cases/common/188 find override/subdir/gencodegen.py.in"
@@ -10,6 +10,7 @@ ftempl = '''int %s() {
 }
 '''
 
-d = pathlib.Path(ifilename).read_text().split('\n')[0].strip()
-
-pathlib.Path(ofilename).write_text(ftempl % d)
+with pathlib.Path(ifilename).open('r') as f:
+    d = f.readline().strip()
+with pathlib.Path(ofilename).open('w') as f:
+    f.write(ftempl % d)
--- "a/test cases/unit/35 dist script/replacer.py"
+++ "b/test cases/unit/35 dist script/replacer.py"
@@ -7,6 +7,8 @@ source_root = pathlib.Path(os.environ['M
 
 modfile = source_root / 'prog.c'
 
-contents = modfile.read_text()
+with modfile.open('r') as f:
+    contents = f.read()
 contents = contents.replace('"incorrect"', '"correct"')
-modfile.write_text(contents)
+with modfile.open('w') as f:
+    f.write(contents)
--- "a/test cases/windows/13 test argument extra paths/test/test_run_exe.py"
+++ "b/test cases/windows/13 test argument extra paths/test/test_run_exe.py"
@@ -7,6 +7,6 @@ if __name__ == '__main__':
     parser.add_argument('prog')
     args = parser.parse_args()
 
-    res = subprocess.run(args.prog)
+    ret = subprocess.call(args.prog)
 
-    sys.exit(res.returncode - 42)
+    sys.exit(ret - 42)