$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-FFT.git /var/lib/mock/f45-build-24686-605/root/chroot_tmpdir/scmroot/perl-Math-FFT
Cloning into '/var/lib/mock/f45-build-24686-605/root/chroot_tmpdir/scmroot/perl-Math-FFT'...
$ git fetch origin 69eddd564a13818b5c10e71692eb33a8e33880f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-FFT
 * [new ref]         69eddd564a13818b5c10e71692eb33a8e33880f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69eddd5 Perl 5.44 rebuild