$ git clone -n https://src.fedoraproject.org/rpms/rust-vmw_backdoor.git /var/lib/mock/f45-build-46100-830/root/chroot_tmpdir/scmroot/rust-vmw_backdoor
Cloning into '/var/lib/mock/f45-build-46100-830/root/chroot_tmpdir/scmroot/rust-vmw_backdoor'...
$ git fetch origin 61e4430c20337ea95058f2eb14d5bf5d676f3d21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vmw_backdoor
 * [new ref]         61e4430c20337ea95058f2eb14d5bf5d676f3d21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61e4430 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild