$ git clone -n https://src.fedoraproject.org/rpms/rust-entropy.git /var/lib/mock/f45-build-41440-782/root/chroot_tmpdir/scmroot/rust-entropy
Cloning into '/var/lib/mock/f45-build-41440-782/root/chroot_tmpdir/scmroot/rust-entropy'...
$ git fetch origin 8b46c1ad876ed4e6f15b92681ac468251a5518eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-entropy
 * [new ref]         8b46c1ad876ed4e6f15b92681ac468251a5518eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b46c1a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild