$ git clone -n https://src.fedoraproject.org/rpms/erlang-mimetypes.git /var/lib/mock/f41-build-1102255-20038/root/chroot_tmpdir/scmroot/erlang-mimetypes
Cloning into '/var/lib/mock/f41-build-1102255-20038/root/chroot_tmpdir/scmroot/erlang-mimetypes'...
$ git fetch origin 0461ef202dda7f8a94ba973b1d29ef232ee18325:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-mimetypes
 * [new ref]         0461ef202dda7f8a94ba973b1d29ef232ee18325 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0461ef2 mimetypes ver. 1.1.0