$ git clone -n https://src.fedoraproject.org/rpms/rust-primal-bit.git /var/lib/mock/f45-build-43979-809/root/chroot_tmpdir/scmroot/rust-primal-bit
Cloning into '/var/lib/mock/f45-build-43979-809/root/chroot_tmpdir/scmroot/rust-primal-bit'...
$ git fetch origin 6ff81d67dd9e9a7add4454770bfcabfbf2b521b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-primal-bit
 * [new ref]         6ff81d67dd9e9a7add4454770bfcabfbf2b521b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ff81d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild