From e9b4340a25dfb7a5f8cec5b05f2fac6362eb7a2c Mon Sep 17 00:00:00 2001
From: jcfp <jcfp@users.noreply.github.com>
Date: Wed, 3 Jun 2020 15:57:52 +0200
Subject: [PATCH] extend filesystem tests (#1481)

* extend filesystem tests

* fix test failure when no explicit umask was set

* have black uglify the code

* require case-sensitive fs for test_capitalization_linux

* run black with -l120 instead

* make windows-compatible, fix some minor issues

* mark xfail rather than comment out part of trim_win_path
---
 sabnzbd/filesystem.py    |   2 +-
 tests/requirements.txt   |   3 +-
 tests/test_filesystem.py | 768 ++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 767 insertions(+), 6 deletions(-)

diff --git a/sabnzbd/filesystem.py b/sabnzbd/filesystem.py
index 2f26ee8..9fbdf6f 100644
--- a/sabnzbd/filesystem.py
+++ b/sabnzbd/filesystem.py
@@ -252,7 +252,7 @@ def is_obfuscated_filename(filename):
     """ Check if this file has an extension, if not, it's
         probably obfuscated and we don't use it
     """
-    return os.path.splitext(filename)[1] == ""
+    return len(get_ext(filename)) < 2
 
 
 def real_path(loc, path):
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 73688da..2e26c65 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -2,6 +2,7 @@
 selenium
 requests
 pytest
+pyfakefs
 
 # Only works on Python 3.6+
-black; python_version >= "3.6"
\ No newline at end of file
+black; python_version >= "3.6"
diff --git a/tests/test_filesystem.py b/tests/test_filesystem.py
index 5205215..f0dd060 100644
--- a/tests/test_filesystem.py
+++ b/tests/test_filesystem.py
@@ -16,14 +16,24 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 """
-tests.test_misc - Testing functions in filesystem.py
+tests.test_filesystem - Testing functions in filesystem.py
 """
+import os
+import stat
+import pyfakefs.fake_filesystem_unittest as ffs
 
 import sabnzbd.filesystem as filesystem
+import sabnzbd.cfg
 
 from tests.testhelper import *
 
 
+# Set the global uid for fake filesystems to a non-root user;
+# by default this depends on the user running pytest.
+global_uid = 1000
+ffs.set_uid(global_uid)
+
+
 class TestFileFolderNameSanitizer:
     def test_empty(self):
         assert filesystem.sanitize_filename(None) is None
@@ -32,17 +42,30 @@ class TestFileFolderNameSanitizer:
     @set_platform("win32")
     def test_colon_handling_windows(self):
         assert filesystem.sanitize_filename("test:aftertest") == "test-aftertest"
+        assert filesystem.sanitize_filename(":") == "-"
+        assert filesystem.sanitize_filename("test:") == "test-"
+        assert filesystem.sanitize_filename("test: ") == "test-"
         # They should act the same
         assert filesystem.sanitize_filename("test:aftertest") == filesystem.sanitize_foldername("test:aftertest")
-        # TODO: Add a lot more tests here!
 
     @set_platform("darwin")
     def test_colon_handling_darwin(self):
         assert filesystem.sanitize_filename("test:aftertest") == "aftertest"
+        assert filesystem.sanitize_filename(":aftertest") == "aftertest"
+        assert filesystem.sanitize_filename("::aftertest") == "aftertest"
+        assert filesystem.sanitize_filename(":after:test") == "test"
+        # Empty after sanitising with darwin colon handling
+        assert filesystem.sanitize_filename(":") == "unknown"
+        assert filesystem.sanitize_filename("test:") == "unknown"
+        assert filesystem.sanitize_filename("test: ") == "unknown"
 
     @set_platform("linux")
+    @set_config({"sanitize_safe": False})
     def test_colon_handling_other(self):
         assert filesystem.sanitize_filename("test:aftertest") == "test:aftertest"
+        assert filesystem.sanitize_filename(":") == ":"
+        assert filesystem.sanitize_filename("test:") == "test:"
+        assert filesystem.sanitize_filename("test: ") == "test:"
 
     @set_platform("win32")
     def test_win_devices_on_win(self):
@@ -53,6 +76,7 @@ class TestFileFolderNameSanitizer:
         assert filesystem.sanitize_filename("a$mft") == "a$mft"
 
     @set_platform("linux")
+    @set_config({"sanitize_safe": False})
     def test_win_devices_not_win(self):
         # Linux and Darwin are the same for this
         assert filesystem.sanitize_filename(None) is None
@@ -61,21 +85,140 @@ class TestFileFolderNameSanitizer:
         assert filesystem.sanitize_filename("$mft") == "$mft"
         assert filesystem.sanitize_filename("a$mft") == "a$mft"
 
+    @set_platform("linux")
+    @set_config({"sanitize_safe": False})
+    def test_file_illegal_chars_linux(self):
+        assert filesystem.sanitize_filename("test/aftertest") == "test+aftertest"
+        assert filesystem.sanitize_filename("/test") == "+test"
+        assert filesystem.sanitize_filename("test/") == "test+"
+        assert filesystem.sanitize_filename(r"/test\/aftertest/") == r"+test\+aftertest+"
+        assert filesystem.sanitize_filename("/") == "+"
+        assert filesystem.sanitize_filename("///") == "+++"
+        assert filesystem.sanitize_filename("../") == "..+"
+        assert filesystem.sanitize_filename("../test") == "..+test"
+
+    @set_platform("linux")
+    @set_config({"sanitize_safe": False})
+    def test_folder_illegal_chars_linux(self):
+        assert filesystem.sanitize_foldername('test"aftertest') == "test'aftertest"
+        assert filesystem.sanitize_foldername("test:") == "test-"
+        assert filesystem.sanitize_foldername("test<>?*|aftertest") == "test<>?*|aftertest"
+
+    def test_char_collections(self):
+        assert len(filesystem.CH_ILLEGAL) == len(filesystem.CH_LEGAL)
+        assert len(filesystem.CH_ILLEGAL_WIN) == len(filesystem.CH_LEGAL_WIN)
+
+    @set_platform("linux")
+    @set_config({"sanitize_safe": False})
+    def test_legal_chars_linux(self):
+        # Illegal on Windows but not on Linux, unless sanitize_safe is active.
+        # Don't bother with '/' which is illegal in filenames on all platforms.
+        char_ill = filesystem.CH_ILLEGAL_WIN.replace("/", "")
+        assert filesystem.sanitize_filename("test" + char_ill + "aftertest") == ("test" + char_ill + "aftertest")
+        for char in char_ill:
+            # Try at start, middle, and end of a filename.
+            assert filesystem.sanitize_filename("test" + char * 2 + "aftertest") == ("test" + char * 2 + "aftertest")
+            assert filesystem.sanitize_filename("test" + char * 2) == ("test" + char * 2).strip()
+            assert filesystem.sanitize_filename(char * 2 + "test") == (char * 2 + "test").strip()
+
+    @set_platform("linux")
+    @set_config({"sanitize_safe": True})
+    def test_sanitize_safe_linux(self):
+        # Set sanitize_safe to on, simulating Windows-style restrictions.
+        assert filesystem.sanitize_filename("test" + filesystem.CH_ILLEGAL_WIN + "aftertest") == (
+            "test" + filesystem.CH_LEGAL_WIN + "aftertest"
+        )
+        for index in range(0, len(filesystem.CH_ILLEGAL_WIN)):
+            char_leg = filesystem.CH_LEGAL_WIN[index]
+            char_ill = filesystem.CH_ILLEGAL_WIN[index]
+            assert filesystem.sanitize_filename("test" + char_ill * 2 + "aftertest") == (
+                "test" + char_leg * 2 + "aftertest"
+            )
+            # Illegal chars that also get caught by strip() never make it far
+            # enough to be replaced by their legal equivalents if they appear
+            # on either end of the filename.
+            if char_ill.strip():
+                assert filesystem.sanitize_filename("test" + char_ill * 2) == ("test" + char_leg * 2)
+                assert filesystem.sanitize_filename(char_ill * 2 + "test") == (char_leg * 2 + "test")
+
+    def test_filename_dot(self):
+        # All dots should survive in filenames
+        assert filesystem.sanitize_filename(".test") == ".test"
+        assert filesystem.sanitize_filename("..test") == "..test"
+        assert filesystem.sanitize_filename("test.") == "test."
+        assert filesystem.sanitize_filename("test..") == "test.."
+        assert filesystem.sanitize_filename("test.aftertest") == "test.aftertest"
+        assert filesystem.sanitize_filename("test..aftertest") == "test..aftertest"
+        assert filesystem.sanitize_filename("test.aftertest.") == "test.aftertest."
+        assert filesystem.sanitize_filename("test.aftertest..") == "test.aftertest.."
+
+    def test_foldername_dot(self):
+        # Dot should be removed from the end of directory names only
+        assert filesystem.sanitize_foldername(".test") == ".test"
+        assert filesystem.sanitize_foldername("..test") == "..test"
+        assert filesystem.sanitize_foldername("test.") == "test"
+        assert filesystem.sanitize_foldername("test..") == "test"
+        assert filesystem.sanitize_foldername("test.aftertest") == "test.aftertest"
+        assert filesystem.sanitize_foldername("test..aftertest") == "test..aftertest"
+        assert filesystem.sanitize_foldername("test.aftertest.") == "test.aftertest"
+        assert filesystem.sanitize_foldername("test.aftertest..") == "test.aftertest"
+        assert filesystem.sanitize_foldername("/test/this.") == "+test+this"
+        assert filesystem.sanitize_foldername("/test./this.") == "+test.+this"
+
+    def test_filename_empty_result(self):
+        # Nothing remains after sanitizing the filename
+        assert filesystem.sanitize_filename("\n") == "unknown"
+        assert filesystem.sanitize_filename("\r\n") == "unknown"
+        assert filesystem.sanitize_filename("\n\r") == "unknown"
+        assert filesystem.sanitize_filename("\t\t\t") == "unknown"
+        assert filesystem.sanitize_filename(" ") == "unknown"
+        assert filesystem.sanitize_filename("  ") == "unknown"
+
+    def test_foldername_empty_result(self):
+        # Nothing remains after sanitizing the foldername
+        assert filesystem.sanitize_foldername("\n") == "unknown"
+        assert filesystem.sanitize_foldername("\r\n") == "unknown"
+        assert filesystem.sanitize_foldername("\n\r") == "unknown"
+        assert filesystem.sanitize_foldername("\t\t\t") == "unknown"
+        assert filesystem.sanitize_foldername(" ") == "unknown"
+        assert filesystem.sanitize_foldername("  ") == "unknown"
+
 
 class TestSameFile:
-    def test_nothing_in_common(self):
+    def test_nothing_in_common_win_paths(self):
         assert 0 == filesystem.same_file("C:\\", "D:\\")
         assert 0 == filesystem.same_file("C:\\", "/home/test")
+
+    def test_nothing_in_common_unix_paths(self):
         assert 0 == filesystem.same_file("/home/", "/data/test")
         assert 0 == filesystem.same_file("/test/home/test", "/home/")
+        assert 0 == filesystem.same_file("/test/../home", "/test")
+        assert 0 == filesystem.same_file("/test/./test", "/test")
+
+    @pytest.mark.skipif(sys.platform.startswith("win"), reason="Not for Windows")
+    @set_platform("linux")
+    def test_posix_fun(self):
+        assert 1 == filesystem.same_file("/test", "/test")
+        # IEEE 1003.1-2017 par. 4.13 for details
+        assert 0 == filesystem.same_file("/test", "//test")
+        assert 1 == filesystem.same_file("/test", "///test")
+        assert 1 == filesystem.same_file("/test", "/test/")
+        assert 1 == filesystem.same_file("/test", "/test//")
+        assert 1 == filesystem.same_file("/test", "/test///")
 
     def test_same(self):
         assert 1 == filesystem.same_file("/home/123", "/home/123")
         assert 1 == filesystem.same_file("D:\\", "D:\\")
+        assert 1 == filesystem.same_file("/test/../test", "/test")
+        assert 1 == filesystem.same_file("test/../test", "test")
+        assert 1 == filesystem.same_file("/test/./test", "/test/test")
+        assert 1 == filesystem.same_file("./test", "test")
 
     def test_subfolder(self):
         assert 2 == filesystem.same_file("\\\\?\\C:\\", "\\\\?\\C:\\Users\\")
         assert 2 == filesystem.same_file("/home/test123", "/home/test123/sub")
+        assert 2 == filesystem.same_file("/test", "/test/./test")
+        assert 2 == filesystem.same_file("/home/../test", "/test/./test")
 
     @set_platform("win32")
     def test_capitalization(self):
@@ -83,4 +226,621 @@ class TestSameFile:
         assert 1 == filesystem.same_file("/HOME/123", "/home/123")
         assert 1 == filesystem.same_file("D:\\", "d:\\")
         assert 2 == filesystem.same_file("\\\\?\\c:\\", "\\\\?\\C:\\Users\\")
-        assert 2 == filesystem.same_file("/HOME/test123", "/home/test123/sub")
+
+    @pytest.mark.skipif(sys.platform.startswith(("win", "darwin")), reason="Requires a case-sensitive filesystem")
+    @set_platform("linux")
+    def test_capitalization_linux(self):
+        assert 2 == filesystem.same_file("/home/test123", "/home/test123/sub")
+        assert 0 == filesystem.same_file("/test", "/Test")
+        assert 0 == filesystem.same_file("tesT", "Test")
+        assert 0 == filesystem.same_file("/test/../Home", "/home")
+
+
+class TestIsObfuscatedFilename:
+    def test_obfuscated(self):
+        # Files are considered obfuscated if they lack an extension
+        assert filesystem.is_obfuscated_filename(".") is True
+        assert filesystem.is_obfuscated_filename("..") is True
+        assert filesystem.is_obfuscated_filename(".test") is True
+        assert filesystem.is_obfuscated_filename("test.") is True
+        assert filesystem.is_obfuscated_filename("test.ext.") is True
+        assert filesystem.is_obfuscated_filename("t.....") is True
+        assert filesystem.is_obfuscated_filename("a_" + ("test" * 666)) is True
+
+    def test_not_obfuscated(self):
+        assert filesystem.is_obfuscated_filename("test.ext") is False
+        assert filesystem.is_obfuscated_filename(".test.ext") is False
+        assert filesystem.is_obfuscated_filename("test..ext") is False
+        assert filesystem.is_obfuscated_filename("test.ext") is False
+        assert filesystem.is_obfuscated_filename("test .ext") is False
+        assert filesystem.is_obfuscated_filename("test. ext") is False
+        assert filesystem.is_obfuscated_filename("test . ext") is False
+        assert filesystem.is_obfuscated_filename("a." + ("test" * 666)) is False
+
+
+class TestClipLongPath:
+    def test_empty(self):
+        assert filesystem.clip_path(None) is None
+        assert filesystem.long_path(None) is None
+
+    @set_platform("win32")
+    def test_clip_path_win(self):
+        assert filesystem.clip_path(r"\\?\UNC\test") == r"\\test"
+        assert filesystem.clip_path(r"\\?\F:\test") == r"F:\test"
+
+    @set_platform("win32")
+    def test_nothing_to_clip_win(self):
+        assert filesystem.clip_path(r"\\test") == r"\\test"
+        assert filesystem.clip_path(r"F:\test") == r"F:\test"
+        assert filesystem.clip_path("/test/dir") == "/test/dir"
+
+    @set_platform("linux")
+    def test_clip_path_non_win(self):
+        # Shouldn't have any effect on platforms other than Windows
+        assert filesystem.clip_path(r"\\?\UNC\test") == r"\\?\UNC\test"
+        assert filesystem.clip_path(r"\\?\F:\test") == r"\\?\F:\test"
+        assert filesystem.clip_path(r"\\test") == r"\\test"
+        assert filesystem.clip_path(r"F:\test") == r"F:\test"
+        assert filesystem.clip_path("/test/dir") == "/test/dir"
+
+    @set_platform("win32")
+    def test_long_path_win(self):
+        assert filesystem.long_path(r"\\test") == r"\\?\UNC\test"
+        assert filesystem.long_path(r"F:\test") == r"\\?\F:\test"
+
+    @set_platform("win32")
+    def test_nothing_to_lenghten_win(self):
+        assert filesystem.long_path(r"\\?\UNC\test") == r"\\?\UNC\test"
+        assert filesystem.long_path(r"\\?\F:\test") == r"\\?\F:\test"
+
+    @set_platform("linux")
+    def test_long_path_non_win(self):
+        # Shouldn't have any effect on platforms other than Windows
+        assert filesystem.long_path(r"\\?\UNC\test") == r"\\?\UNC\test"
+        assert filesystem.long_path(r"\\?\F:\test") == r"\\?\F:\test"
+        assert filesystem.long_path(r"\\test") == r"\\test"
+        assert filesystem.long_path(r"F:\test") == r"F:\test"
+        assert filesystem.long_path("/test/dir") == "/test/dir"
+
+
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Broken on Windows")
+class TestCheckMountLinux(ffs.TestCase):
+    # Our collection of fake directories
+    test_dirs = ["/media/test/dir", "/mnt/TEST/DIR"]
+
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.path_separator = "/"
+        self.fs.is_case_sensitive = True
+        for dir in self.test_dirs:
+            self.fs.create_dir(dir, perm_bits=755)
+            # Sanity check the fake filesystem
+            assert os.path.exists(dir) is True
+
+    @set_platform("linux")
+    def test_bare_mountpoint_linux(self):
+        assert filesystem.check_mount("/media") is True
+        assert filesystem.check_mount("/media/") is True
+        assert filesystem.check_mount("/mnt") is True
+        assert filesystem.check_mount("/mnt/") is True
+
+    @set_platform("linux")
+    def test_existing_dir_linux(self):
+        assert filesystem.check_mount("/media/test") is True
+        assert filesystem.check_mount("/media/test/dir/") is True
+        assert filesystem.check_mount("/media/test/DIR/") is True
+        assert filesystem.check_mount("/mnt/TEST") is True
+        assert filesystem.check_mount("/mnt/TEST/dir/") is True
+        assert filesystem.check_mount("/mnt/TEST/DIR/") is True
+
+    @set_platform("linux")
+    # Cut down a bit on the waiting time
+    @set_config({"wait_ext_drive": 1})
+    def test_dir_nonexistent_linux(self):
+        # Filesystem is case-sensitive on this platform
+        assert filesystem.check_mount("/media/TEST") is False  # Issue #1457
+        assert filesystem.check_mount("/media/TesT/") is False
+        assert filesystem.check_mount("/mnt/TeSt/DIR") is False
+        assert filesystem.check_mount("/mnt/test/DiR/") is False
+
+    @set_platform("linux")
+    def test_dir_outsider_linux(self):
+        # Outside of /media and /mnt
+        assert filesystem.check_mount("/test/that/") is True
+        # Root directory
+        assert filesystem.check_mount("/") is True
+
+
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Broken on Windows")
+class TestCheckMountDarwin(ffs.TestCase):
+    # Our faked macos directory
+    test_dir = "/Volumes/test/dir"
+
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.is_macos = True
+        self.fs.is_case_sensitive = False
+        self.fs.path_separator = "/"
+        self.fs.create_dir(self.test_dir, perm_bits=755)
+        # Verify the fake filesystem does its thing
+        assert os.path.exists(self.test_dir) is True
+
+    @set_platform("darwin")
+    def test_bare_mountpoint_darwin(self):
+        assert filesystem.check_mount("/Volumes") is True
+        assert filesystem.check_mount("/Volumes/") is True
+
+    @set_platform("darwin")
+    def test_existing_dir_darwin(self):
+        assert filesystem.check_mount("/Volumes/test") is True
+        assert filesystem.check_mount("/Volumes/test/dir/") is True
+        # Filesystem is set case-insensitive for this platform
+        assert filesystem.check_mount("/VOLUMES/test") is True
+        assert filesystem.check_mount("/volumes/Test/dir/") is True
+
+    @set_platform("darwin")
+    # Cut down a bit on the waiting time
+    @set_config({"wait_ext_drive": 1})
+    def test_dir_nonexistent_darwin(self):
+        # Within /Volumes
+        assert filesystem.check_mount("/Volumes/nosuchdir") is False  # Issue #1457
+        assert filesystem.check_mount("/Volumes/noSuchDir/") is False
+        assert filesystem.check_mount("/Volumes/nosuchDIR/subdir") is False
+        assert filesystem.check_mount("/Volumes/NOsuchdir/subdir/") is False
+
+    @set_platform("darwin")
+    def test_dir_outsider_darwin(self):
+        # Outside of /Volumes
+        assert filesystem.check_mount("/test/that/") is True
+        # Root directory
+        assert filesystem.check_mount("/") is True
+
+
+class TestCheckMountWin(ffs.TestCase):
+    # Our faked windows directory
+    test_dir = r"F:\test\dir"
+
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.is_windows_fs = True
+        self.fs.is_case_sensitive = False
+        self.fs.path_separator = "\\"
+        self.fs.create_dir(self.test_dir)
+        # Sanity check the fake filesystem
+        assert os.path.exists(self.test_dir) is True
+
+    @set_platform("win32")
+    def test_existing_dir_win(self):
+        assert filesystem.check_mount("F:\\test") is True
+        assert filesystem.check_mount("F:\\test\\dir\\") is True
+        # Filesystem and drive letters are case-insensitive on this platform
+        assert filesystem.check_mount("f:\\Test") is True
+        assert filesystem.check_mount("f:\\test\\DIR\\") is True
+
+    @set_platform("win32")
+    def test_bare_mountpoint_win(self):
+        assert filesystem.check_mount("F:\\") is True
+        assert filesystem.check_mount("Z:\\") is False
+
+    @set_platform("win32")
+    def test_dir_nonexistent_win(self):
+        # The existance of the drive letter is what really matters
+        assert filesystem.check_mount("F:\\NoSuchDir") is True
+        assert filesystem.check_mount("F:\\NoSuchDir\\") is True
+        assert filesystem.check_mount("F:\\NOsuchdir\\subdir") is True
+        assert filesystem.check_mount("F:\\nosuchDIR\\subdir\\") is True
+
+    @set_platform("win32")
+    # Cut down a bit on the waiting time
+    @set_config({"wait_ext_drive": 1})
+    def test_dir_on_nonexistent_drive_win(self):
+        # Non-existent drive-letter
+        assert filesystem.check_mount("H:\\NoSuchDir") is False
+        assert filesystem.check_mount("E:\\NoSuchDir\\") is False
+        assert filesystem.check_mount("L:\\NOsuchdir\\subdir") is False
+        assert filesystem.check_mount("L:\\nosuchDIR\\subdir\\") is False
+
+    @set_platform("win32")
+    def test_dir_outsider_win(self):
+        # Outside the local filesystem
+        assert filesystem.check_mount("//test/that/") is True
+
+
+class TestTrimWinPath:
+    @set_platform("win32")
+    def test_short_path(self):
+        assert filesystem.trim_win_path(r"C:\short\path") == r"C:\short\path"
+
+    @pytest.mark.xfail(sys.platform == "win32", reason="Bug in trim_win_path")
+    @set_platform("win32")
+    def test_long_path_short_segments(self):
+        test_path = "C:\\" + "A" * 20 + "\\" + "B" * 20 + "\\" + "C" * 20  # Strlen 65
+        # Current code causes the path to end up with strlen 70 rather than 69 on Windows
+        assert filesystem.trim_win_path(test_path + "\\" + ("D" * 20)) == test_path + "\\" + "D" * 3
+
+
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Broken on Windows")
+class TestRecursiveListdir(ffs.TestCase):
+    # Basic fake filesystem setup stanza
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.path_separator = "/"
+        self.fs.is_case_sensitive = True
+
+    def test_nonexistent_dir(self):
+        assert filesystem.recursive_listdir("/foo/bar") == []
+
+    def test_no_exceptions(self):
+        test_files = (
+            "/test/dir/file1.ext",
+            "/test/dir/file2",
+            "/test/dir/sub/sub/sub/dir/file3.ext",
+        )
+        for file in test_files:
+            self.fs.create_file(file)
+            assert os.path.exists(file) is True
+        # List our fake directory structure
+        results_subdir = filesystem.recursive_listdir("/test/dir")
+        assert len(results_subdir) == 3
+        for entry in test_files:
+            assert (entry in results_subdir) is True
+
+        # List the same directory again, this time using its parent as the function argument.
+        # Results should be identical, since there's nothing in /test but that one subdirectory
+        results_parent = filesystem.recursive_listdir("/test")
+        # Don't make assumptions about the sorting of the lists of results
+        results_parent.sort()
+        results_subdir.sort()
+        assert results_parent == results_subdir
+
+        # List that subsubsub-directory; no sorting required for a single result
+        assert filesystem.recursive_listdir("/test/dir/sub/sub") == ["/test/dir/sub/sub/sub/dir/file3.ext"]
+
+    def test_exception_appledouble(self):
+        # Anything below a .AppleDouble directory should be omitted
+        test_file = "/foo/bar/.AppleDouble/Oooooo.ps"
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file) is True
+        assert filesystem.recursive_listdir("/foo") == []
+        assert filesystem.recursive_listdir("/foo/bar") == []
+        assert filesystem.recursive_listdir("/foo/bar/.AppleDouble") == []
+
+    def test_exception_dsstore(self):
+        # Anything below a .DS_Store directory should be omitted
+        for file in (
+            "/some/FILE",
+            "/some/.DS_Store/oh.NO",
+            "/some/.DS_Store/subdir/The.End",
+        ):
+            self.fs.create_file(file)
+            assert os.path.exists(file) is True
+        assert filesystem.recursive_listdir("/some") == ["/some/FILE"]
+        assert filesystem.recursive_listdir("/some/.DS_Store/") == []
+        assert filesystem.recursive_listdir("/some/.DS_Store/subdir") == []
+
+    def test_invalid_file_argument(self):
+        # This is obviously not intended use; the function expects a directory
+        # as its argument, not a file. Test anyway.
+        test_file = "/dev/sleepy"
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file) is True
+        assert filesystem.recursive_listdir(test_file) == []
+
+
+class TestRecursiveListdirWin(ffs.TestCase):
+    # Basic fake filesystem setup stanza
+    @set_platform("win32")
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.is_windows_fs = True
+        self.fs.path_separator = "\\"
+        self.fs.is_case_sensitive = False
+
+    def test_nonexistent_dir(self):
+        assert filesystem.recursive_listdir(r"F:\foo\bar") == []
+
+    def test_no_exceptions(self):
+        test_files = (
+            r"f:\test\dir\file1.ext",
+            r"f:\test\dir\file2",
+            r"f:\test\dir\sub\sub\sub\dir\file3.ext",
+        )
+        for file in test_files:
+            self.fs.create_file(file)
+            assert os.path.exists(file) is True
+        # List our fake directory structure
+        results_subdir = filesystem.recursive_listdir(r"f:\test\dir")
+        assert len(results_subdir) == 3
+        for entry in test_files:
+            assert (entry in results_subdir) is True
+
+        # List the same directory again, this time using its parent as the function argument.
+        # Results should be identical, since there's nothing in /test but that one subdirectory
+        results_parent = filesystem.recursive_listdir(r"f:\test")
+        # Don't make assumptions about the sorting of the lists of results
+        results_parent.sort()
+        results_subdir.sort()
+        assert results_parent == results_subdir
+
+        # List that subsubsub-directory; no sorting required for a single result
+        assert (
+            filesystem.recursive_listdir(r"F:\test\dir\SUB\sub")[0].lower() == r"f:\test\dir\sub\sub\sub\dir\file3.ext"
+        )
+
+    def test_exception_appledouble(self):
+        # Anything below a .AppleDouble directory should be omitted
+        test_file = r"f:\foo\bar\.AppleDouble\Oooooo.ps"
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file) is True
+        assert filesystem.recursive_listdir(r"f:\foo") == []
+        assert filesystem.recursive_listdir(r"f:\foo\bar") == []
+        assert filesystem.recursive_listdir(r"F:\foo\bar\.AppleDouble") == []
+
+    def test_exception_dsstore(self):
+        # Anything below a .DS_Store directory should be omitted
+        for file in (
+            r"f:\some\FILE",
+            r"f:\some\.DS_Store\oh.NO",
+            r"f:\some\.DS_Store\subdir\The.End",
+        ):
+            self.fs.create_file(file)
+            assert os.path.exists(file) is True
+        assert filesystem.recursive_listdir(r"f:\some") == [r"f:\some\FILE"]
+        assert filesystem.recursive_listdir(r"f:\some\.DS_Store") == []
+        assert filesystem.recursive_listdir(r"f:\some\.DS_Store\subdir") == []
+
+    def test_invalid_file_argument(self):
+        # This is obviously not intended use; the function expects a directory
+        # as its argument, not a file. Test anyway.
+        test_file = r"f:\dev\sleepy"
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file) is True
+        assert filesystem.recursive_listdir(test_file) == []
+
+
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Broken on Windows")
+class TestGetUniquePathFilename(ffs.TestCase):
+    # Basic fake filesystem setup stanza
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.path_separator = "/"
+        self.fs.is_case_sensitive = True
+
+    # Reduce the waiting time when the function calls check_mount()
+    @set_config({"wait_ext_drive": 1})
+    def test_nonexistent_dir(self):
+        # Absolute path
+        assert filesystem.get_unique_path("/foo/bar", n=0, create_dir=False) == "/foo/bar"
+        # Absolute path in a location that matters to check_mount
+        assert filesystem.get_unique_path("/mnt/foo/bar", n=0, create_dir=False) == "/mnt/foo/bar"
+        # Relative path
+        if self.fs.cwd != "/":
+            os.chdir("/")
+        assert filesystem.get_unique_path("foo/bar", n=0, create_dir=False) == "foo/bar"
+
+    def test_creating_dir(self):
+        # First call also creates the directory for us
+        assert filesystem.get_unique_path("/foo/bar", n=0, create_dir=True) == "/foo/bar"
+        # Verify creation of the path
+        assert os.path.exists("/foo/bar") is True
+        # Directories from previous loops get in the way
+        for dir_n in range(1, 11):  # Go high enough for double digits
+            assert filesystem.get_unique_path("/foo/bar", n=0, create_dir=True) == "/foo/bar." + str(dir_n)
+            assert os.path.exists("/foo/bar." + str(dir_n)) is True
+        # Explicitly set parameter n
+        assert filesystem.get_unique_path("/foo/bar", n=666, create_dir=True) == "/foo/bar.666"
+        assert os.path.exists("/foo/bar.666") is True
+
+    def test_nonexistent_file(self):
+        assert filesystem.get_unique_filename("/dir/file.name") == "/dir/file.name"
+        # Relative path
+        assert filesystem.get_unique_filename("dir/file.name") == "dir/file.name"
+
+    def test_existing_file(self):
+        test_file = "/dir/file.name"
+        max_obstruct = 11  # High enough for double digits
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file)
+        # Create obstructions
+        for n in range(1, max_obstruct):
+            file_n = "/dir/file." + str(n) + ".name"
+            self.fs.create_file(file_n)
+            assert os.path.exists(file_n)
+        assert filesystem.get_unique_filename(test_file) == "/dir/file." + str(max_obstruct) + ".name"
+
+    def test_existing_file_without_extension(self):
+        test_file = "/some/filename"
+        # Create obstructions
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file)
+        assert filesystem.get_unique_filename(test_file) == "/some/filename.1"
+
+
+class TestGetUniquePathFilenameWin(ffs.TestCase):
+    # Basic fake filesystem setup stanza
+    @set_platform("win32")
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.is_windows_fs = True
+        self.fs.path_separator = "\\"
+        self.fs.is_case_sensitive = False
+
+    # Reduce the waiting time when the function calls check_mount()
+    @set_config({"wait_ext_drive": 1})
+    def test_nonexistent_dir(self):
+        # Absolute path
+        assert filesystem.get_unique_path(r"C:\No\Such\Dir", n=0, create_dir=False).lower() == r"c:\no\such\dir"
+        # Relative path
+        assert filesystem.get_unique_path(r"foo\bar", n=0, create_dir=False).lower() == r"foo\bar"
+
+    def test_creating_dir(self):
+        # First call also creates the directory for us
+        assert filesystem.get_unique_path(r"C:\foo\BAR", n=0, create_dir=True).lower() == r"c:\foo\bar"
+        # Verify creation of the path
+        assert os.path.exists(r"c:\foo\bar") is True
+        # Directories from previous loops get in the way
+        for dir_n in range(1, 11):  # Go high enough for double digits
+            assert filesystem.get_unique_path(r"c:\foo\bar", n=0, create_dir=True) == r"c:\foo\bar." + str(dir_n)
+            assert os.path.exists(r"c:\foo\bar." + str(dir_n)) is True
+        # Explicitly set parameter n
+        assert filesystem.get_unique_path(r"c:\Foo\Bar", n=666, create_dir=True).lower() == r"c:\foo\bar.666"
+        assert os.path.exists(r"c:\foo\bar.666") is True
+
+    def test_nonexistent_file(self):
+        assert filesystem.get_unique_filename(r"C:\DIR\file.name").lower() == r"c:\dir\file.name"
+        # Relative path
+        assert filesystem.get_unique_filename(r"DIR\file.name").lower() == r"dir\file.name"
+
+    def test_existing_file(self):
+        test_file = r"C:\dir\file.name"
+        max_obstruct = 11  # High enough for double digits
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file)
+        # Create obstructions
+        for n in range(1, max_obstruct):
+            file_n = r"C:\dir\file." + str(n) + ".name"
+            self.fs.create_file(file_n)
+            assert os.path.exists(file_n)
+        assert filesystem.get_unique_filename(test_file).lower() == r"c:\dir\file." + str(max_obstruct) + ".name"
+
+    def test_existing_file_without_extension(self):
+        test_file = r"c:\some\filename"
+        # Create obstructions
+        self.fs.create_file(test_file)
+        assert os.path.exists(test_file)
+        assert filesystem.get_unique_filename(test_file).lower() == r"c:\some\filename.1"
+
+
+class TestSetPermissionsWin(ffs.TestCase):
+    @set_platform("win32")
+    def test_win32(self):
+        # Should not do or return anything on Windows
+        assert filesystem.set_permissions(r"F:\who\cares", recursive=False) is None
+
+
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Broken on Windows")
+class TestSetPermissions(ffs.TestCase):
+    # Basic fake filesystem setup stanza
+    def setUp(self):
+        self.setUpPyfakefs()
+        self.fs.path_separator = "/"
+        self.fs.is_case_sensitive = True
+        self.fs.umask = int("0755", 8)  # rwxr-xr-x
+
+    def _runner(self, perms_test, perms_after):
+        """
+        Generic test runner for permissions testing. The umask is set per test
+        via the relevant sab config option; the fileystem parameter in setUp().
+        Note that the umask set in the environment before starting the program
+        also affects the results if sabnzbd.cfg.umask isn't set.
+
+        Arguments:
+            str perms_test: permissions for test objects, chmod style "0755".
+            str perms_after: expected permissions after completion of the test.
+        """
+        perms_test = int(perms_test, 8)
+        if sabnzbd.cfg.umask():
+            perms_after = int(perms_after, 8)
+        else:
+            perms_after = int("0777", 8) & (sabnzbd.ORG_UMASK ^ int("0777", 8))
+
+        # Setup and verify fake dir
+        test_dir = "/test"
+        try:
+            self.fs.create_dir(test_dir, perms_test)
+        except PermissionError:
+            ffs.set_uid(0)
+            self.fs.create_dir(test_dir, perms_test)
+        assert os.path.exists(test_dir) is True
+        assert stat.filemode(os.stat(test_dir).st_mode) == "d" + stat.filemode(perms_test)[1:]
+
+        # Setup and verify fake files
+        for file in (
+            "foobar",
+            "file.ext",
+            "sub/dir/.nzb",
+            "another/sub/dir/WithSome.File",
+        ):
+            file = os.path.join(test_dir, file)
+            try:
+                self.fs.create_file(file, perms_test)
+            except PermissionError:
+                try:
+                    ffs.set_uid(0)
+                    self.fs.create_file(file, perms_test)
+                except Exception:
+                    # Skip creating files, if not even using root gets the job done.
+                    break
+            assert os.path.exists(file) is True
+            assert stat.filemode(os.stat(file).st_mode)[1:] == stat.filemode(perms_test)[1:]
+
+        # Set permissions, recursive by default
+        filesystem.set_permissions(test_dir)
+
+        # Check the results
+        for root, dirs, files in os.walk(test_dir):
+            for dir in [os.path.join(root, d) for d in dirs]:
+                # Permissions on directories should now match perms_after
+                assert stat.filemode(os.stat(dir).st_mode) == "d" + stat.filemode(perms_after)[1:]
+            for file in [os.path.join(root, f) for f in files]:
+                # Files also shouldn't have any executable or special bits set
+                assert (
+                    stat.filemode(os.stat(file).st_mode)[1:]
+                    == stat.filemode(
+                        perms_after & ~(stat.S_ISUID | stat.S_ISGID | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
+                    )[1:]
+                )
+
+        # Cleanup
+        ffs.set_uid(0)
+        self.fs.remove_object(test_dir)
+        assert os.path.exists(test_dir) is False
+        ffs.set_uid(global_uid)
+
+    @set_platform("linux")
+    @set_config({"umask": ""})
+    def test_dir0777_empty_umask_setting(self):
+        # World writable directory
+        self._runner("0777", "0700")
+
+    @set_platform("linux")
+    @set_config({"umask": ""})
+    def test_dir0450_empty_umask_setting(self):
+        # Insufficient access
+        self._runner("0450", "0700")
+
+    @set_platform("linux")
+    @set_config({"umask": ""})
+    def test_dir0000_empty_umask_setting(self):
+        # Weird directory permissions
+        self._runner("0000", "0700")
+
+    @set_platform("linux")
+    @set_config({"umask": "0760"})
+    def test_dir0777_umask0760_setting(self):
+        # World-writable directory, umask 760
+        self._runner("0777", "0760")
+
+    @set_platform("linux")
+    @set_config({"umask": "0617"})
+    def test_dir0450_umask0617_setting(self):
+        # Insufficient access, weird umask
+        self._runner("0450", "0717")
+
+    @set_platform("linux")
+    @set_config({"umask": "0000"})
+    def test_dir0405_umask0000_setting(self):
+        # Insufficient access on all fronts, weird umask
+        self._runner("0405", "0700")
+
+    @set_platform("linux")
+    @set_config({"umask": "2455"})
+    def test_dir0444_umask2455_setting(self):
+        # Insufficient access, weird umask with setgid
+        self._runner("0444", "2755")
+
+    @set_platform("linux")
+    @set_config({"umask": "4755"})
+    def test_dir1755_umask4755_setting(self):
+        # Sticky bit on directory, umask with setuid
+        self._runner("1755", "4755")