$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Utils.git /var/lib/mock/f45-build-24868-606/root/chroot_tmpdir/scmroot/perl-Math-Utils
Cloning into '/var/lib/mock/f45-build-24868-606/root/chroot_tmpdir/scmroot/perl-Math-Utils'...
$ git fetch origin 9e1ddffbcc7c880b3e89935a431336ff00ab9dd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Utils
 * [new ref]         9e1ddffbcc7c880b3e89935a431336ff00ab9dd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e1ddff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild