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packet_write_fmt() would die in case of a write error even though for some callers an error would be acceptable. Add packet_write_fmt_gently() which writes a formatted pkt-line like packet_write_fmt() but does not die in case of an error. The function is used in a subsequent patch. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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