Preconditions.checkArgument(since.isPresent(), "Object not found '%s'", this.since);
op.setSince(since.get());
}
if (this.until != null) {
Optional<ObjectId> until;
until = geogig.command(RevParse.class).setRefSpec(this.until).call();
Preconditions.checkArgument(until.isPresent(), "Object not found '%s'", this.until);
op.setUntil(until.get());
}
if (paths != null && !paths.isEmpty()) {
for (String path : paths) {