X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fbup%2Fgit.py;h=69134ac33ae4ba0df4eb6bb691b51bbf6e7572e7;hb=84cb94e1feb584ae7c67d65c27b2ff1a8e01e489;hp=73a50b88773f6585c01e264775cfe9a91c0bd120;hpb=22e2df2ce1c28e900bc06a9bac4ffd17019c22d6;p=bup.git

diff --git a/lib/bup/git.py b/lib/bup/git.py
index 73a50b8..69134ac 100644
--- a/lib/bup/git.py
+++ b/lib/bup/git.py
@@ -772,7 +772,7 @@ def _make_objcache():
 # bup-gc assumes that it can disable all PackWriter activities
 # (bloom/midx/cache) via the constructor and close() arguments.
 
-class PackWriter:
+class PackWriter(object):
     """Writes Git objects inside a pack file."""
     def __init__(self, objcache_maker=_make_objcache, compression_level=1,
                  run_midx=True, on_pack_finish=None,
@@ -918,16 +918,15 @@ class PackWriter:
 
     def _end(self, run_midx=True, abort=False):
         # Ignores run_midx during abort
-        if not self.file:
-            return None
+        self.parentfd, pfd, = None, self.parentfd
         self.file, f = None, self.file
         self.idx, idx = None, self.idx
-        self.parentfd, pfd, = None, self.parentfd
-
         try:
             with nullcontext_if_not(self.objcache), \
                  finalized(pfd, lambda x: x is not None and os.close(x)), \
-                 f:
+                 nullcontext_if_not(f):
+                if not f:
+                    return None
 
                 if abort:
                     os.unlink(self.filename + b'.pack')
@@ -1157,14 +1156,24 @@ def rev_parse(committish, repo_dir=None):
     return None
 
 
-def update_ref(refname, newval, oldval, repo_dir=None):
-    """Update a repository reference."""
-    if not oldval:
-        oldval = b''
+def update_ref(refname, newval, oldval, repo_dir=None, force=False):
+    """Update a repository reference.
+
+    With force=True, don't care about the previous ref (oldval);
+    with force=False oldval must be either a sha1 or None (for an
+    entirely new branch)
+    """
+    if force:
+        assert oldval is None
+        oldarg = []
+    elif not oldval:
+        oldarg = [b'']
+    else:
+        oldarg = [hexlify(oldval)]
     assert refname.startswith(b'refs/heads/') \
         or refname.startswith(b'refs/tags/')
     p = subprocess.Popen([b'git', b'update-ref', refname,
-                          hexlify(newval), hexlify(oldval)],
+                          hexlify(newval)] + oldarg,
                          env=_gitenv(repo_dir),
                          close_fds=True)
     _git_wait(b'git update-ref', p)