бэкэнд для быстрых импортеров данных Git (Backend for fast Git data importers)
Сигналы (Signals)
Sending SIGUSR1 to the git fast-import process ends the current
packfile early, simulating a checkpoint command. The impatient
operator can use this facility to peek at the objects and refs
from an import in progress, at the cost of some added running
time and worse compression.
