$ git clone -n https://src.fedoraproject.org/rpms/rust-rand.git /var/lib/mock/f45-build-44215-811/root/chroot_tmpdir/scmroot/rust-rand
Cloning into '/var/lib/mock/f45-build-44215-811/root/chroot_tmpdir/scmroot/rust-rand'...
$ git fetch origin f092f92ec80268aa9c8acca321e30a2aa6be9d68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand
 * [new ref]         f092f92ec80268aa9c8acca321e30a2aa6be9d68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f092f92 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild