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由 Nicolas Pitre 提交于
This is in preparation for using write_idx_file(). Also, by using sha1write() we get some buffering to reduces the number of write syscalls, and the written data is SHA1 summed which allows for the extra data integrity validation check performed in fixup_pack_header_footer() (details on this in commit abeb40e5). Signed-off-by: NNicolas Pitre <nico@fluxnic.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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