def check_heads(repo, their_heads, context):
"""check if the heads of a repo have been modified
Used by peer for unbundling.
"""
heads = repo.heads()
heads_hash = util.sha1(''.join(sorted(heads))).digest()
if not (their_heads == ['force'] or their_heads == heads or
their_heads == ['hashed', heads_hash]):
# someone else committed/pushed/unbundled while we
# were transferring data
raise error.PushRaced('repository changed while %s - '
'please try again' % context)
def handlechangegroup(op, inpart):
"""check that head of the repo did not change
This is used to detect a push race when using unbundle.
This replaces the "heads" argument of unbundle."""
h = inpart.read(20)
heads = []
while len(h) == 20:
heads.append(h)
h = inpart.read(20)
assert not h
if heads != op.repo.heads():
raise error.PushRaced('repository changed while pushing - '
'please try again')
