Fixed Popple's symlink bug which threatened source directory

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@578 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

branches/r0-12/rdiff-backup/CHANGELOG

@@ -11,6 +11,12 @@ was a timezone bug.  (Thanks to Stephen Isard)
 Fixed timezone bug.  Hopefully this is the last one.  (Thanks to
 Randall Nortman for bug report.)
 
+************** Serious bug fix ******************
+If a directory in the source directory was replaced by certain
+symlinks, then if later backups failed they could cause files in the
+directory that the symlink pointed to to be deleted!  Much thanks to
+Alistair Popple for pointing this bug out and providing a test case.
+
 
 New in v0.12.7 (2004/05/31)
 ---------------------------

branches/r0-12/rdiff-backup/rdiff_backup/restore.py

@@ -510,7 +510,7 @@ as data loss may result.\n""" % (self.mirror_rp.get_indexpath(),), 2)
 				inc_list = []
 			else: inc_rp, inc_list = inc_pair
 			if not mirror_rp:
-				mirror_rp = self.mirror_rp.new_index(inc_rp.index)
+				mirror_rp = self.mirror_rp.new_index_empty(inc_rp.index)
 			yield self.__class__(mirror_rp, inc_rp, inc_list)
 
 	def yield_mirrorrps(self, mirrorrp):

branches/r0-12/rdiff-backup/rdiff_backup/rpath.py

@@ -790,6 +790,10 @@ class RPath(RORPath):
 		"""Return similar RPath but with new index"""
 		return self.__class__(self.conn, self.base, index)
 
+	def new_index_empty(self, index):
+		"""Return similar RPath with given index, but initialize to empty"""
+		return self.__class__(self.conn, self.base, index, {'type': None})
+
 	def open(self, mode, compress = None):
 		"""Return open file.  Supports modes "w" and "r".
 

branches/r0-12/rdiff-backup/testing/finaltest.py

@@ -596,5 +596,53 @@ class FinalMisc(PathSetter):
 		for inc in self.get_all_increments(rbdir):
 			assert inc.getinctime() >= 20000
 
+
+class FinalBugs(PathSetter):
+	"""Test for specific bugs that have been reported"""
+	def test_symlink_popple(self):
+		"""Test for Popple's symlink bug
+
+		Earlier, certain symlinks could cause data loss in _source_
+		directory when regressing.  See mailing lists around 4/2/05
+		for more info.
+
+		"""
+		self.delete_tmpdirs()
+		self.set_connections(None, None, None, None)
+
+		# Make directories
+		rp1 = rpath.RPath(Globals.local_connection, 'testfiles/sym_in1')
+		if rp1.lstat(): rp1.delete()
+		rp1.mkdir()
+		rp1_d = rp1.append('subdir')
+		rp1_d.mkdir()
+		rp1_d_f = rp1_d.append('file')
+		rp1_d_f.touch()
+		
+		rp2 = rpath.RPath(Globals.local_connection, 'testfiles/sym_in2')
+		if rp2.lstat(): rp2.delete()
+		rp2.mkdir()
+		rp2_s = rp2.append('subdir')
+		rp2_s.symlink("%s/%s" % (os.getcwd(), rp1_d.path))
+
+		# Backup
+		self.exec_rb(10000, rp1.path, 'testfiles/output')
+		self.exec_rb(20000, rp2.path, 'testfiles/output')
+
+		# Make failed backup
+		rbdir = rpath.RPath(Globals.local_connection,
+							'testfiles/output/rdiff-backup-data')
+		curmir = rbdir.append('current_mirror.%s.data' %
+							  (Time.timetostring(30000),))
+		curmir.touch()
+
+		# Regress
+		self.exec_rb_extra_args(30000, '--check-destination-dir',
+								'testfiles/output')
+
+		# Check to see if file still there
+		rp1_d_f.setdata()
+		assert rp1_d_f.isreg(), 'File %s corrupted' % (rp1_d_f.path,)
+
 		
 if __name__ == "__main__": unittest.main()