simplify control flow in RestoreHelper methods

Make the control flow more obvious. The code in question was
introduced with commit ea6d3c3e… but did not make sense back then
either because cur_index which is the constant $1$ was compared
to the literal constant $0$:

+        cur_index = 1
+        while cur_index < len(self._data):
+            data = self._data[cur_index]
…
+                if cur_index == 0:

This bogus test was since removed but the convoluted ``while``
loop survived. Instead, access index 1 only once using an integer
literal.

diff --git a/deltatar/deltatar.py b/deltatar/deltatar.py
index 5c3d9b5..508048e 100644 (file)
--- a/deltatar/deltatar.py
+++ b/deltatar/deltatar.py
@@ -1481,7 +1481,7 @@ class RestoreHelper(object):
         # if path is found in the first index as to be snapshotted, deal with it
         # and finish
         if path.startswith('snapshot://'):
-            self.restore_file(itpath, data, path, l_no, self._deltatar.unprefixed(path))
+            self.restore_file(itpath, data, path, l_no, upath)
 
             # now we restore parent_directory mtime
             os.utime(parent_dir, (parent_dir_mtime, parent_dir_mtime))
@@ -1489,28 +1489,27 @@ class RestoreHelper(object):
 
         # we go from index to index, finding the path in the index, then finding
         # the index with the most recent snapshot of the file being restored
-        cur_index = 1
-        while cur_index < len(self._data):
-            data = self._data[cur_index]
-            d, l_no, dpath = self.find_path_in_index(data, upath)
-            if not d:
-                self._deltatar.logger.warn('Error restoring file %s from '
-                    'index, not found in index %s' % (path, data['path']))
-                return
-
-            if d.get('path', '').startswith('delete://'):
-                self._deltatar.logger.warn(('Strange thing happened, file '
-                    '%s was listed in first index but deleted by another '
-                    'one. Path was ignored and untouched.') % path)
-                return
-            elif d.get('path', '').startswith('snapshot://'):
-                self.restore_file(d, data, path, l_no, dpath)
-
-                # now we restore parent_directory mtime
-                os.utime(parent_dir, (parent_dir_mtime, parent_dir_mtime))
-                return
-            elif d.get('path', '').startswith('list://'):
-                continue
+        if len(self._data) > 1:
+            data = self._data[1]
+            while True:
+                d, l_no, dpath = self.find_path_in_index(data, upath)
+                if not d:
+                    self._deltatar.logger.warn('Error restoring file %s from '
+                                               'index, not found in index %s' % (path, data['path']))
+                    return
+
+                cur_path = d.get('path', '')
+                if cur_path.startswith('delete://'):
+                    self._deltatar.logger.warn(('Strange thing happened, file '
+                                                '%s was listed in first index but deleted by another '
+                                                'one. Path was ignored and untouched.') % path)
+                    return
+                elif cur_path.startswith('snapshot://'):
+                    self.restore_file(d, data, path, l_no, dpath)
+
+                    # now we restore parent_directory mtime
+                    os.utime(parent_dir, (parent_dir_mtime, parent_dir_mtime))
+                    return
 
         self._deltatar.logger.warn(('Error restoring file %s from index, '
                                     'snapshot not found in any index') % path)
@@ -1519,17 +1518,16 @@ class RestoreHelper(object):
         # NOTE: we restart the iterator sometimes because the iterator can be
         # walked over completely multiple times, for example if one path if not
         # found in one index and we have to go to the next index.
-        if data['iterator'] is None:
+        it = data['iterator']
+        if it is None:
             it = data['iterator'] = self._deltatar.iterate_index_path(data["path"])
             d, l_no = it.__next__()
         else:
-            it = data['iterator']
             d = data['last_itelement']
             l_no = data['last_lno']
 
-        dpath = self._deltatar.unprefixed(d.get('path', ''))
-
         while True:
+            dpath = self._deltatar.unprefixed(d.get('path', ''))
             if upath == dpath:
                 data['last_itelement'] = d
                 data['last_lno'] = l_no
@@ -1549,7 +1547,6 @@ class RestoreHelper(object):
                 data['last_itelement'] = d
                 data['last_lno'] = l_no
                 return None, 0, ''
-            dpath = self._deltatar.unprefixed(d.get('path', ''))
 
     def restore_directories_permissions(self):
         '''