Added readonly test for file system case sensitivity

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@643 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/rdiff_backup/fs_abilities.py

@@ -28,11 +28,12 @@ FSAbilities object describing it.
 """
 
 import errno, os
-import Globals, log, TempFile, selection
+import Globals, log, TempFile, selection, robust
 
 class FSAbilities:
 	"""Store capabilities of given file system"""
 	chars_to_quote = None # Hold characters not allowable in file names
+	case_sensitive = None # True if "foobar" and "FoObAr" are different files
 	ownership = None # True if chown works on this filesystem
 	acls = None # True if access control lists supported
 	eas = None # True if extended attributes supported
@@ -94,6 +95,7 @@ class FSAbilities:
 							  ('High-bit permissions', self.high_perms)])
 		add_boolean_list([('Access control lists', self.acls),
 						  ('Extended attributes', self.eas),
+						  ('Case sensitivity', self.case_sensitive),
 						  ('Mac OS X style resource forks',
 						   self.resource_forks),
 						  ('Mac OS X Finder information', self.carbonfile)])
@@ -117,6 +119,7 @@ class FSAbilities:
 		self.set_acls(rp)
 		self.set_resource_fork_readonly(rp)
 		self.set_carbonfile()
+		self.set_case_sensitive_readonly(rp)
 		return self
 
 	def init_readwrite(self, rbdir, use_ctq_file = 1,
@@ -233,10 +236,11 @@ rdiff-backup-data/chars_to_quote.
 				lower_a.delete()
 				upper_a.setdata()
 				assert not upper_a.lstat()
-				return 0
+				self.case_sensitive = 0
 			else:
 				upper_a.delete()
-				return 1
+				self.case_sensitive = 1
+			return self.case_sensitive
 
 		def supports_unusual_chars():
 			"""Test handling of several chars sometimes not supported"""
@@ -285,7 +289,50 @@ rdiff-backup-data/chars_to_quote.
 			log.Log("ACLs not supported by filesystem at %s" % (rp.path,), 4)
 			self.acls = 0
 		else: self.acls = 1
-		
+
+	def set_case_sensitive_readonly(self, rp):
+		"""Determine if directory at rp is case sensitive without writing"""
+		def find_letter(subdir):
+			"""Find a (subdir_rp, dirlist) with a letter in it, or None
+
+			Recurse down the directory, looking for any file that has
+			a letter in it.  Return the pair (rp, [list of filenames])
+			where the list is of the directory containing rp.
+
+			"""
+			l = robust.listrp(subdir)
+			for filename in l:
+				if filename != filename.swapcase():
+					return (subdir, l, filename)
+			for filename in l:
+				dir_rp = subdir.append(filename)
+				if dir_rp.isdir():
+					subsearch = find_letter(dir_rp)
+					if subsearch: return subsearch
+			return None
+
+		def test_triple(dir_rp, dirlist, filename):
+			"""Return 1 if filename shows system case sensitive"""
+			letter_rp = dir_rp.append(filename)
+			assert letter_rp.lstat(), letter_rp
+			swapped = filename.swapcase()
+			if swapped in dirlist: return 1
+
+			swapped_rp = dir_rp.append(swapped)
+			if swapped_rp.lstat(): return 0
+			return 1
+
+		triple = find_letter(rp)
+		if not triple:
+			log.Log("Warning: could not determine case sensitivity of "
+					"source directory at\n  " + rp.path + "\n"
+					"because we can't find any files with letters in them.\n"
+					"It will be treated as case sensitive.", 2)
+			self.case_sensitive = 1
+			return
+
+		self.case_sensitive = test_triple(*triple)
+
 	def set_eas(self, rp, write):
 		"""Set extended attributes from rp. Tests writing if write is true."""
 		assert Globals.local_connection is rp.conn

trunk/rdiff-backup/testing/fs_abilitiestest.py

@@ -15,6 +15,7 @@ class FSAbilitiesTest(unittest.TestCase):
 	dir_to_test = "testfiles"
 	eas = acls = 1
 	chars_to_quote = ""
+	case_sensitive = 1
 	ownership = (os.getuid() == 0)
 	hardlinks = fsync_dirs = 1
 	dir_inc_perms = 1
@@ -32,6 +33,9 @@ class FSAbilitiesTest(unittest.TestCase):
 	#resource_forks = 0
 	#carbonfile = 0
 	
+	# A case insensitive directory (a cdrom mount on my system!)
+	case_insensitive_path = "/media/cdrecorder"
+
 	def testReadOnly(self):
 		"""Test basic querying read only"""
 		base_dir = rpath.RPath(Globals.local_connection, self.dir_to_test)
@@ -42,6 +46,7 @@ class FSAbilitiesTest(unittest.TestCase):
 		assert fsa.acls == self.acls, fsa.acls
 		assert fsa.resource_forks == self.resource_forks, fsa.resource_forks
 		assert fsa.carbonfile == self.carbonfile, fsa.carbonfile
+		assert fsa.case_sensitive == self.case_sensitive, fsa.case_sensitive
 
 	def testReadWrite(self):
 		"""Test basic querying read/write"""
@@ -75,5 +80,12 @@ class FSAbilitiesTest(unittest.TestCase):
 
 		new_dir.delete()
 
+	def test_case_sensitive(self):
+		"""Test a read-only case-INsensitive directory"""
+		rp = rpath.RPath(Globals.local_connection, self.case_insensitive_path)
+		fsa = fs_abilities.FSAbilities('read-only')
+		fsa.set_case_sensitive_readonly(rp)
+		assert fsa.case_sensitive == 0, fsa.case_sensitive
+
 if __name__ == "__main__": unittest.main()