fast-import: treat SIGUSR1 as a request to access objects early
It can be tedious to wait for a multi-million-revision import. Unfortunately it is hard to spy on the import because fast-import works by continuously streaming out objects, without updating the pack index or refs until a checkpoint command or the end of the stream. So allow the impatient operator to request checkpoints by sending a signal, like so: killall -USR1 git-fast-import When receiving such a signal, fast-import would schedule a checkpoint to take place after the current top-level command (usually a "commit" or "blob" request) finishes. Caveats: just like ordinary checkpoint commands, such requests slow down the import. Switching to a new pack at a suboptimal moment is also likely to result in a less dense initial collection of packs. That's the price. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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