$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Round.git /var/lib/mock/f45-build-24874-606/root/chroot_tmpdir/scmroot/perl-Math-Round
Cloning into '/var/lib/mock/f45-build-24874-606/root/chroot_tmpdir/scmroot/perl-Math-Round'...
$ git fetch origin 9917a3bfdfbbb8e43ff9871a8e8d68fdbd8417d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Round
 * [new ref]         9917a3bfdfbbb8e43ff9871a8e8d68fdbd8417d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9917a3b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild