have git export directly to a tar file

Later, add compression by piping to a gzip process.

2 files changed, 2 insertions, 7 deletions

diff --git a/morphlib/builder.py b/morphlib/builder.py
index 704a9d84..2889c3a5 100644
--- a/morphlib/builder.py
+++ b/morphlib/builder.py
@@ -183,7 +183,7 @@ class Chunk(BinaryBlob):
 
     def create_source_and_tarball(self):
         self.msg('Creating source tree and tarball')
-        tarball = self.cache_prefix + '.src.tar.gz'
+        tarball = self.cache_prefix + '.src.tar'
         morphlib.git.export_sources(self.repo, self.ref, tarball)
         os.mkdir(self.builddir)
         f = tarfile.open(tarball)
diff --git a/morphlib/git.py b/morphlib/git.py
index 14cba0e6..59f59c9b 100644
--- a/morphlib/git.py
+++ b/morphlib/git.py
@@ -14,7 +14,6 @@
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 
-import gzip
 import logging
 import urlparse
 
@@ -40,11 +39,7 @@ class TooManyMorphs(Exception):
 def export_sources(repo, ref, tar_filename):
     '''Export the contents of a specific commit into a compressed tarball.'''
     ex = morphlib.execute.Execute('.', msg=logging.debug)
-    tar = ex.runv(['git', 'archive', '--remote', repo, ref])
-    f = gzip.open(tar_filename, 'wb')
-    f.write(tar)
-    f.close()
-
+    ex.runv(['git', 'archive', '-o', tar_filename, '--remote', repo, ref])
 
 def get_commit_id(repo, ref):
     '''Return the full SHA-1 commit id for a repo+ref.'''