Add long_path=False option to abspath_expanduser_unicode.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/allmydata/test/test_util.py

@@ -528,12 +528,14 @@ class FileUtil(ReallyEqualMixin, unittest.TestCase):
 
         saved_cwd = os.path.normpath(os.getcwdu())
         abspath_cwd = fileutil.abspath_expanduser_unicode(u".")
+        abspath_cwd_notlong = fileutil.abspath_expanduser_unicode(u".", long_path=False)
         self.failUnless(isinstance(saved_cwd, unicode), saved_cwd)
         self.failUnless(isinstance(abspath_cwd, unicode), abspath_cwd)
         if sys.platform == "win32":
             self.failUnlessReallyEqual(abspath_cwd, fileutil.to_windows_long_path(saved_cwd))
         else:
             self.failUnlessReallyEqual(abspath_cwd, saved_cwd)
+        self.failUnlessReallyEqual(abspath_cwd_notlong, saved_cwd)
 
         self.failUnlessReallyEqual(fileutil.to_windows_long_path(u"\\\\?\\foo"), u"\\\\?\\foo")
         self.failUnlessReallyEqual(fileutil.to_windows_long_path(u"\\\\.\\foo"), u"\\\\.\\foo")
@@ -562,7 +564,19 @@ class FileUtil(ReallyEqualMixin, unittest.TestCase):
 
             self.failUnlessReallyEqual(baz[4], bar[4])  # same drive
 
+            baz_notlong = fileutil.abspath_expanduser_unicode(u"\\baz", long_path=False)
+            self.failIf(baz_notlong.startswith(u"\\\\?\\"), baz_notlong)
+            self.failUnlessReallyEqual(baz_notlong[1 :], u":\\baz")
+
+            bar_notlong = fileutil.abspath_expanduser_unicode(u"\\bar", base=baz, long_path=False)
+            self.failIf(bar_notlong.startswith(u"\\\\?\\"), bar_notlong)
+            self.failUnlessReallyEqual(bar_notlong[1 :], u":\\bar")
+            # not u":\\baz\\bar", because \bar is absolute on the current drive.
+
+            self.failUnlessReallyEqual(baz_notlong[0], bar_notlong[0])  # same drive
+
         self.failIfIn(u"~", fileutil.abspath_expanduser_unicode(u"~"))
+        self.failIfIn(u"~", fileutil.abspath_expanduser_unicode(u"~", long_path=False))
 
         cwds = ['cwd']
         try:
@@ -578,6 +592,9 @@ class FileUtil(ReallyEqualMixin, unittest.TestCase):
                 for upath in (u'', u'fuu', u'f\xf9\xf9', u'/fuu', u'U:\\', u'~'):
                     uabspath = fileutil.abspath_expanduser_unicode(upath)
                     self.failUnless(isinstance(uabspath, unicode), uabspath)
+
+                    uabspath_notlong = fileutil.abspath_expanduser_unicode(upath, long_path=False)
+                    self.failUnless(isinstance(uabspath_notlong, unicode), uabspath_notlong)
             finally:
                 os.chdir(saved_cwd)
 

src/allmydata/util/encodingutil.py

@@ -96,7 +96,7 @@ def argv_to_unicode(s):
         raise usage.UsageError("Argument %s cannot be decoded as %s." %
                                (quote_output(s), io_encoding))
 
-def argv_to_abspath(s):
+def argv_to_abspath(s, long_path=True):
     """
     Convenience function to decode an argv element to an absolute path, with ~ expanded.
     If this fails, raise a UsageError.
@@ -105,7 +105,7 @@ def argv_to_abspath(s):
     if decoded.startswith(u'-'):
         raise usage.UsageError("Path argument %s cannot start with '-'.\nUse %s if you intended to refer to a file."
                                % (quote_output(s), quote_output(os.path.join('.', s))))
-    return abspath_expanduser_unicode(decoded)
+    return abspath_expanduser_unicode(decoded, long_path=long_path)
 
 def unicode_to_argv(s, mangle=False):
     """

src/allmydata/util/fileutil.py

@@ -276,13 +276,14 @@ try:
 except ImportError:
     pass
 
-def abspath_expanduser_unicode(path, base=None):
+def abspath_expanduser_unicode(path, base=None, long_path=True):
     """
     Return the absolute version of a path. If 'base' is given and 'path' is relative,
     the path will be expanded relative to 'base'.
     'path' must be a Unicode string. 'base', if given, must be a Unicode string
     corresponding to an absolute path as returned by a previous call to
     abspath_expanduser_unicode.
+    On Windows, the result will be a long path unless long_path is given as False.
     """
     if not isinstance(path, unicode):
         raise AssertionError("paths must be Unicode strings")
@@ -313,7 +314,7 @@ def abspath_expanduser_unicode(path, base=None):
     # there is always at least one Unicode path component.
     path = os.path.normpath(path)
 
-    if sys.platform == "win32":
+    if sys.platform == "win32" and long_path:
         path = to_windows_long_path(path)
 
     return path