$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_pcg.git /var/lib/mock/f45-build-44259-812/root/chroot_tmpdir/scmroot/rust-rand_pcg
Cloning into '/var/lib/mock/f45-build-44259-812/root/chroot_tmpdir/scmroot/rust-rand_pcg'...
$ git fetch origin 41c60c116c9d8603f367e89865bee7f5b7388668:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_pcg
 * [new ref]         41c60c116c9d8603f367e89865bee7f5b7388668 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41c60c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild