бэкэнд для быстрых импортеров данных Git (Backend for fast Git data importers)
PARALLEL OPERATION
Like git push or git fetch, imports handled by fast-import are
safe to run alongside parallel git repack -a -d or git gc
invocations, or any other Git operation (including git prune, as
loose objects are never used by fast-import).
fast-import does not lock the branch or tag refs it is actively
importing. After the import, during its ref update phase,
fast-import tests each existing branch ref to verify the update
will be a fast-forward update (the commit stored in the ref is
contained in the new history of the commit to be written). If the
update is not a fast-forward update, fast-import will skip
updating that ref and instead prints a warning message.
fast-import will always attempt to update all branch refs, and
does not stop on the first failure.
Branch updates can be forced with --force, but it's recommended
that this only be used on an otherwise quiet repository. Using
--force is not necessary for an initial import into an empty
repository.
