Add functions for creating and unpacking binary chunks.

1 files changed, 49 insertions, 0 deletions

diff --git a/morphlib/bins.py b/morphlib/bins.py
new file mode 100644
index 00000000..de946020
--- /dev/null
+++ b/morphlib/bins.py
@@ -0,0 +1,49 @@
+# Copyright (C) 2011  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+'''Functions for dealing with Baserock binaries.
+
+Binaries are chunks, strata, and system images.
+
+'''
+
+
+import logging
+import tarfile
+
+import morphlib
+
+
+def create_chunk(rootdir, chunk_filename):
+    '''Create a chunk from the contents of a directory.'''
+    logging.debug('Creating chunk file %s from %s' % (chunk_filename, rootdir))
+    tar = tarfile.open(name=chunk_filename, mode='w:gz')
+    tar.add(rootdir, arcname='.')
+    tar.close()
+
+
+def unpack_chunk(chunk_filename, dirname):
+    '''Unpack a chunk into a directory.
+    
+    The directory must exist already.
+    
+    '''
+
+    logging.debug('Unpacking chunk %s into %s' % (chunk_filename, dirname))
+    tar = tarfile.open(name=chunk_filename)
+    tar.extractall(path=dirname)
+    tar.close()
+