def update(source_uri)
use_incremental = false
begin
gem_names = fetch_quick_index source_uri
remove_extra gem_names
missing_gems = find_missing gem_names
return false if missing_gems.size.zero?
say "missing #{missing_gems.size} gems" if
missing_gems.size > 0 and Gem.configuration.really_verbose
use_incremental = missing_gems.size <= Gem.configuration.bulk_threshold
rescue Gem::OperationNotSupportedError => ex
alert_error "Falling back to bulk fetch: #{ex.message}" if
Gem.configuration.really_verbose
use_incremental = false
end
if use_incremental then
update_with_missing(source_uri, missing_gems)
else
new_index = fetch_bulk_index(source_uri)
@gems.replace(new_index.gems)
end
true
end