$ git clone -n https://src.fedoraproject.org/rpms/perl-IRC-Utils.git /var/lib/mock/f45-build-24238-602/root/chroot_tmpdir/scmroot/perl-IRC-Utils
Cloning into '/var/lib/mock/f45-build-24238-602/root/chroot_tmpdir/scmroot/perl-IRC-Utils'...
$ git fetch origin 908faf3b03685d7271ba37d3f266390574224059:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IRC-Utils
 * [new ref]         908faf3b03685d7271ba37d3f266390574224059 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 908faf3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild