OSC (openSUSE build service VCS tool) fast-export compatible with
git fast-import(1).

Just run this inside of the OBS package checkout and output
should be piped to git fast-import(1).

It is useful to prepare authors file (per default
.osc/authorsfile.txt) which is one-to-one mapping between logins
(used in osc log) and full names+emails. E.g., one line of the
file could be:

    mcepl = Matěj Cepl <mcepl@cepl.eu>