});
builder.setParentIds(Lists.newArrayList(parents));
builder.setTreeId(commit.getTreeId());
long timestamp = platform.currentTimeMillis();
builder.setCommitterTimestamp(timestamp);
builder.setCommitterTimeZoneOffset(platform.timeZoneOffset(timestamp));
RevCommit newCommit = builder.build();
replacedCommits.put(commit.getId(), newCommit.getId());
objectDatabase().put(newCommit);
head = newCommit.getId();