From bb7342253d6e9b3a2b0003565b3fd2cfb50d15f2 Mon Sep 17 00:00:00 2001
From: Steve Slaven <bpk@hoopajoo.net>
Date: Tue, 28 Jul 2009 21:24:34 -0700
Subject: Added some more debug info, assert that our calculated size when
 saving matches what we thought it would


diff --git a/fusearchive.py b/fusearchive.py
index 61dc821..15d4d60 100755
--- a/fusearchive.py
+++ b/fusearchive.py
@@ -619,7 +619,9 @@ class FuseArchive(Fuse):
 
         def read(self, length, offset):
             logging.debug( "Reading from " + self.orig_path + " offset: " + str( offset )
-                + " length: " + str( length ) )
+                + ' (0x%x) ' % offset
+                + " length: " + str( length )
+                + ' (0x%x)' % length )
 
             data_read = 0
             data = ''
@@ -661,7 +663,9 @@ class FuseArchive(Fuse):
                 return len( buf )
 
             logging.debug( "Writing to " + self.orig_path + " offset: " + str( offset ) +
-                ' (0x%x)' % offset )
+                ' (0x%x) ' % offset
+                + ' length: ' + str( len( buf ) )
+                + ' (0x%x)' % len( buf ) )
 
             index = int( offset / self.chunk_size )
             rest = offset % self.chunk_size
@@ -769,6 +773,8 @@ class FuseArchive(Fuse):
                 # And flush any cached chunks
                 self._flush_chunks()
 
+                save_size = self.size
+
                 # Figure out our size based on the number of chunks + the
                 # len of the final chunk
                 numchunks = len( self.chunks )
@@ -782,7 +788,12 @@ class FuseArchive(Fuse):
                     logging.debug( "No chunks, setting size to zero" )
                     self.size = 0
 
-                logging.debug( "Size calculated is: " + str( self.size ) )
+                # If this assert fails then write/ftruncate failed to set
+                # things up right somewhere
+                assert save_size == self.size, "Calculated size " + str( self.size ) \
+                    + " doesn't match internal size " + str( save_size ) \
+                    + "\nProbably a bug in write or ftruncate!"
+                logging.debug( "Size calculated is: " + str( self.size ) + ' (0x%x)' % self.size )
 
                 FuseArchiveSerializer.dumpfh( self.file, {
                     'size': self.size,
@@ -834,7 +845,7 @@ class FuseArchive(Fuse):
             curr_chunks = len( self.chunks )
             need_chunks = ( length / self.chunk_size )
             extra_bytes = length % self.chunk_size
-            logging.debug( "Ftruncate - " + str(length) )
+            logging.debug( "Ftruncate - " + str(length) + ' (0x%x) ' % length )
             logging.debug( " - curr_chunks: " + str( curr_chunks ) )
             logging.debug( " - need_chunks: " + str( need_chunks ) )
             logging.debug( " - extra_bytes: " + str( extra_bytes ) )
@@ -845,9 +856,10 @@ class FuseArchive(Fuse):
 
             self._load_chunk( 0 )
 
-            if need_chunks == 0:
+            if length == 0:
                 logging.debug( "Creating 0 chunk file" )
                 self.chunks = []
+                self.chunk = ''
             elif self.size < length:
                 logging.debug( "Need to pad out file, writing/seeking to " + str( length ) )
 
@@ -874,12 +886,14 @@ class FuseArchive(Fuse):
                 if len( self.chunk ) > extra_bytes:
                     logging.debug( "Truncating final chunk to " + str( extra_bytes ) )
                     self.chunk = self.chunk[ :extra_bytes ]
-                    self.chunk_dirty = True
+                    logging.debug( "Chunk is now: " + str( len( self.chunk) ) + " bytes" )
 
+            self.chunk_modified = True
             self.modified = True
             self.size = length
             self._load_chunk( 0 )
 
+            logging.debug( "ftruncate complete" )
             self._fflush()
 
         def lock(self, cmd, owner, **kw):
-- 
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