Merge pull request #446 from henryiii/henryiii/win27

Python 2.7 fixes

6 files changed, 232 insertions, 7 deletions

diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index 9099eb2..ca8df3f 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -19,8 +19,6 @@ jobs:
         os: [windows-latest, ubuntu-latest] #, macos-latest]
         exclude:
         - os: windows-latest
-          python_version: "2.7"
-        - os: windows-latest
           python_version: "pypy2"
         include:
         - os: ubuntu-latest
@@ -61,7 +59,7 @@ jobs:
           architecture: x64
       # self install testing needs some clarity
       # so its being executed without any other tools running
-      - run: pip install -U setuptools jaraco.windows
+      - run: pip install -U setuptools
       - run: python setup.py egg_info
       - run: python setup.py sdist
       - run: easy_install dist/*
@@ -93,7 +91,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install --upgrade wheel setuptools jaraco.windows
+        pip install --upgrade wheel setuptools
     - run: python setup.py egg_info
     - name: Build package
       run: python setup.py bdist_egg
@@ -115,7 +113,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install --upgrade wheel setuptools jaraco.windows
+        pip install --upgrade wheel setuptools
     - run: python setup.py egg_info
     - name: Build package
       run: python setup.py bdist_wheel sdist
diff --git a/setup.cfg b/setup.cfg
index b079bd8..c8f46a1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,7 +32,6 @@ zip_safe = true
 python_requires= >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
 install_requires=
     setuptools
-    jaraco.windows; python_version=="2.7"
 packages=find:
 package_dir=
    =src
diff --git a/src/setuptools_scm/git.py b/src/setuptools_scm/git.py
index b717584..76be436 100644
--- a/src/setuptools_scm/git.py
+++ b/src/setuptools_scm/git.py
@@ -6,7 +6,10 @@ from os.path import isfile, join
 import warnings
 
 
-from os.path import samefile
+try:
+    from os.path import samefile
+except ImportError:
+    from .win_py31_compat import samefile
 
 
 DEFAULT_DESCRIBE = "git describe --dirty --tags --long --match *[0-9]*"
diff --git a/src/setuptools_scm/win_py31_compat.py b/src/setuptools_scm/win_py31_compat.py
new file mode 100644
index 0000000..82a11eb
--- /dev/null
+++ b/src/setuptools_scm/win_py31_compat.py
@@ -0,0 +1,214 @@
+"""
+Backport of os.path.samefile for Python prior to 3.2
+on Windows from jaraco.windows 3.8.
+
+DON'T EDIT THIS FILE!
+
+Instead, file tickets and PR's with `jaraco.windows
+<https://github.com/jaraco/jaraco.windows>`_ and request
+a port to setuptools_scm.
+"""
+
+import os
+import nt
+import posixpath
+import ctypes.wintypes
+import sys
+import __builtin__ as builtins
+
+
+##
+# From jaraco.windows.error
+
+def format_system_message(errno):
+	"""
+	Call FormatMessage with a system error number to retrieve
+	the descriptive error message.
+	"""
+	# first some flags used by FormatMessageW
+	ALLOCATE_BUFFER = 0x100
+	FROM_SYSTEM = 0x1000
+
+	# Let FormatMessageW allocate the buffer (we'll free it below)
+	# Also, let it know we want a system error message.
+	flags = ALLOCATE_BUFFER | FROM_SYSTEM
+	source = None
+	message_id = errno
+	language_id = 0
+	result_buffer = ctypes.wintypes.LPWSTR()
+	buffer_size = 0
+	arguments = None
+	bytes = ctypes.windll.kernel32.FormatMessageW(
+		flags,
+		source,
+		message_id,
+		language_id,
+		ctypes.byref(result_buffer),
+		buffer_size,
+		arguments,
+	)
+	# note the following will cause an infinite loop if GetLastError
+	#  repeatedly returns an error that cannot be formatted, although
+	#  this should not happen.
+	handle_nonzero_success(bytes)
+	message = result_buffer.value
+	ctypes.windll.kernel32.LocalFree(result_buffer)
+	return message
+
+
+class WindowsError(builtins.WindowsError):
+	"""
+	More info about errors at
+	http://msdn.microsoft.com/en-us/library/ms681381(VS.85).aspx
+	"""
+
+	def __init__(self, value=None):
+		if value is None:
+			value = ctypes.windll.kernel32.GetLastError()
+		strerror = format_system_message(value)
+		if sys.version_info > (3, 3):
+			args = 0, strerror, None, value
+		else:
+			args = value, strerror
+		super(WindowsError, self).__init__(*args)
+
+	@property
+	def message(self):
+		return self.strerror
+
+	@property
+	def code(self):
+		return self.winerror
+
+	def __str__(self):
+		return self.message
+
+	def __repr__(self):
+		return '{self.__class__.__name__}({self.winerror})'.format(**vars())
+
+
+def handle_nonzero_success(result):
+	if result == 0:
+		raise WindowsError()
+
+
+##
+# From jaraco.windows.api.filesystem
+
+FILE_FLAG_OPEN_REPARSE_POINT = 0x00200000
+FILE_FLAG_BACKUP_SEMANTICS = 0x2000000
+OPEN_EXISTING = 3
+FILE_ATTRIBUTE_NORMAL = 0x80
+FILE_READ_ATTRIBUTES = 0x80
+INVALID_HANDLE_VALUE = ctypes.wintypes.HANDLE(-1).value
+
+
+class BY_HANDLE_FILE_INFORMATION(ctypes.Structure):
+	_fields_ = [
+		('file_attributes', ctypes.wintypes.DWORD),
+		('creation_time', ctypes.wintypes.FILETIME),
+		('last_access_time', ctypes.wintypes.FILETIME),
+		('last_write_time', ctypes.wintypes.FILETIME),
+		('volume_serial_number', ctypes.wintypes.DWORD),
+		('file_size_high', ctypes.wintypes.DWORD),
+		('file_size_low', ctypes.wintypes.DWORD),
+		('number_of_links', ctypes.wintypes.DWORD),
+		('file_index_high', ctypes.wintypes.DWORD),
+		('file_index_low', ctypes.wintypes.DWORD),
+	]
+
+	@property
+	def file_size(self):
+		return (self.file_size_high << 32) + self.file_size_low
+
+	@property
+	def file_index(self):
+		return (self.file_index_high << 32) + self.file_index_low
+
+
+class SECURITY_ATTRIBUTES(ctypes.Structure):
+	_fields_ = (
+		('length', ctypes.wintypes.DWORD),
+		('p_security_descriptor', ctypes.wintypes.LPVOID),
+		('inherit_handle', ctypes.wintypes.BOOLEAN),
+	)
+
+
+LPSECURITY_ATTRIBUTES = ctypes.POINTER(SECURITY_ATTRIBUTES)
+
+
+CreateFile = ctypes.windll.kernel32.CreateFileW
+CreateFile.argtypes = (
+	ctypes.wintypes.LPWSTR,
+	ctypes.wintypes.DWORD,
+	ctypes.wintypes.DWORD,
+	LPSECURITY_ATTRIBUTES,
+	ctypes.wintypes.DWORD,
+	ctypes.wintypes.DWORD,
+	ctypes.wintypes.HANDLE,
+)
+CreateFile.restype = ctypes.wintypes.HANDLE
+
+GetFileInformationByHandle = ctypes.windll.kernel32.GetFileInformationByHandle
+GetFileInformationByHandle.restype = ctypes.wintypes.BOOL
+GetFileInformationByHandle.argtypes = (
+	ctypes.wintypes.HANDLE,
+	ctypes.POINTER(BY_HANDLE_FILE_INFORMATION),
+)
+
+
+##
+# From jaraco.windows.filesystem
+
+def compat_stat(path):
+	"""
+	Generate stat as found on Python 3.2 and later.
+	"""
+	stat = os.stat(path)
+	info = get_file_info(path)
+	# rewrite st_ino, st_dev, and st_nlink based on file info
+	return nt.stat_result(
+		(stat.st_mode,) +
+		(info.file_index, info.volume_serial_number, info.number_of_links) +
+		stat[4:]
+	)
+
+
+def samefile(f1, f2):
+	"""
+	Backport of samefile from Python 3.2 with support for Windows.
+	"""
+	return posixpath.samestat(compat_stat(f1), compat_stat(f2))
+
+
+def get_file_info(path):
+	# open the file the same way CPython does in posixmodule.c
+	desired_access = FILE_READ_ATTRIBUTES
+	share_mode = 0
+	security_attributes = None
+	creation_disposition = OPEN_EXISTING
+	flags_and_attributes = (
+		FILE_ATTRIBUTE_NORMAL |
+		FILE_FLAG_BACKUP_SEMANTICS |
+		FILE_FLAG_OPEN_REPARSE_POINT
+	)
+	template_file = None
+
+	handle = CreateFile(
+		path,
+		desired_access,
+		share_mode,
+		security_attributes,
+		creation_disposition,
+		flags_and_attributes,
+		template_file,
+	)
+
+	if handle == INVALID_HANDLE_VALUE:
+		raise WindowsError()
+
+	info = BY_HANDLE_FILE_INFORMATION()
+	res = GetFileInformationByHandle(handle, info)
+	handle_nonzero_success(res)
+
+	return info
diff --git a/testing/test_file_finder.py b/testing/test_file_finder.py
index a6e3d70..463d3d4 100644
--- a/testing/test_file_finder.py
+++ b/testing/test_file_finder.py
@@ -9,6 +9,8 @@ from setuptools_scm.integration import find_files
 @pytest.fixture(params=["git", "hg"])
 def inwd(request, wd, monkeypatch):
     if request.param == "git":
+        if sys.platform == "win32" and sys.version_info[0] < 3:
+            pytest.skip("Long/short path names supported on Windows Python 2.7")
         try:
             wd("git init")
         except OSError:
diff --git a/testing/test_git.py b/testing/test_git.py
index e485fc7..e92d19a 100644
--- a/testing/test_git.py
+++ b/testing/test_git.py
@@ -10,6 +10,12 @@ from setuptools_scm.file_finder_git import git_find_files
 import warnings
 
 
+skip_if_win_27 = pytest.mark.skipif(
+    sys.platform == "win32" and sys.version_info[0] < 3,
+    reason="Not supported on Windows + Python 2.7",
+)
+
+
 with warnings.catch_warnings():
     warnings.filterwarnings("ignore")
     if not has_command("git"):
@@ -186,6 +192,7 @@ def test_alphanumeric_tags_match(wd):
     assert wd.version.startswith("0.1.dev1+g")
 
 
+@skip_if_win_27
 def test_git_archive_export_ignore(wd, monkeypatch):
     wd.write("test1.txt", "test")
     wd.write("test2.txt", "test")
@@ -201,6 +208,7 @@ def test_git_archive_export_ignore(wd, monkeypatch):
     assert integration.find_files(".") == [opj(".", "test1.txt")]
 
 
+@skip_if_win_27
 @pytest.mark.issue(228)
 def test_git_archive_subdirectory(wd, monkeypatch):
     wd("mkdir foobar")
@@ -211,6 +219,7 @@ def test_git_archive_subdirectory(wd, monkeypatch):
     assert integration.find_files(".") == [opj(".", "foobar", "test1.txt")]
 
 
+@skip_if_win_27
 @pytest.mark.issue(251)
 def test_git_archive_run_from_subdirectory(wd, monkeypatch):
     wd("mkdir foobar")