$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_chacha0.9.git /var/lib/mock/f45-build-44234-811/root/chroot_tmpdir/scmroot/rust-rand_chacha0.9
Cloning into '/var/lib/mock/f45-build-44234-811/root/chroot_tmpdir/scmroot/rust-rand_chacha0.9'...
$ git fetch origin 9ab1347e74a1d028fe05fe8a24fa245290d07f70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_chacha0.9
 * [new ref]         9ab1347e74a1d028fe05fe8a24fa245290d07f70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ab1347 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild