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Add add_pack and add_thin_pack methods to MemoryObjectStore.
Closes #97.
Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Conflicts:
NEWS
Changes to 3 files · Browse files at 1b63e1e19b5b Showing diff from parent 775ea0a837fe Diff from another changeset...
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@@ -21,6 +21,9 @@
* Support thin packs in Pack.iterobjects() and Pack.get_raw().
(William Grant)
+
+ * Add `MemoryObjectStore.add_pack` and `MemoryObjectStore.add_thin_pack` methods.
+ (David Bennett)
0.9.0 2013-05-31
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@@ -21,6 +21,7 @@ """Git object store interfaces and implementation."""
+from cStringIO import StringIO
import errno
import itertools
import os
@@ -50,6 +51,7 @@from dulwich.pack import (
Pack,
PackData,
+ PackInflater,
iter_sha1,
write_pack_header,
write_pack_index_v2,
@@ -724,6 +726,65 @@ """
for obj, path in objects:
self._data[obj.id] = obj
+
+ def add_pack(self):
+ """Add a new pack to this object store.
+
+ Because this object store doesn't support packs, we extract and add the
+ individual objects.
+
+ :return: Fileobject to write to and a commit function to
+ call when the pack is finished.
+ """
+ f = StringIO()
+ def commit():
+ p = PackData.from_file(StringIO(f.getvalue()), f.tell())
+ f.close()
+ for obj in PackInflater.for_pack_data(p):
+ self._data[obj.id] = obj
+ return f, commit
+
+ def _complete_thin_pack(self, f, indexer):
+ """Complete a thin pack by adding external references.
+
+ :param f: Open file object for the pack.
+ :param indexer: A PackIndexer for indexing the pack.
+ """
+ entries = list(indexer)
+
+ # Update the header with the new number of objects.
+ f.seek(0)
+ write_pack_header(f, len(entries) + len(indexer.ext_refs()))
+
+ # Rescan the rest of the pack, computing the SHA with the new header.
+ new_sha = compute_file_sha(f, end_ofs=-20)
+
+ # Complete the pack.
+ for ext_sha in indexer.ext_refs():
+ assert len(ext_sha) == 20
+ type_num, data = self.get_raw(ext_sha)
+ write_pack_object(f, type_num, data, sha=new_sha)
+ pack_sha = new_sha.digest()
+ f.write(pack_sha)
+
+ def add_thin_pack(self, read_all, read_some):
+ """Add a new thin pack to this object store.
+
+ Thin packs are packs that contain deltas with parents that exist outside
+ the pack. Because this object store doesn't support packs, we extract
+ and add the individual objects.
+
+ :param read_all: Read function that blocks until the number of requested
+ bytes are read.
+ :param read_some: Read function that returns at least one byte, but may
+ not return the number of bytes requested.
+ """
+ f, commit = self.add_pack()
+ indexer = PackIndexer(f, resolve_ext_ref=self.get_raw)
+ copier = PackStreamCopier(read_all, read_some, f, delta_iter=indexer)
+ copier.verify()
+ self._complete_thin_pack(f, indexer)
+ commit()
class ObjectImporter(object):
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