$ git clone -n https://src.fedoraproject.org/rpms/rust-atomic-waker.git /var/lib/mock/f45-build-40300-770/root/chroot_tmpdir/scmroot/rust-atomic-waker
Cloning into '/var/lib/mock/f45-build-40300-770/root/chroot_tmpdir/scmroot/rust-atomic-waker'...
$ git fetch origin 3d76cc5b6a938961e0ddbda4404e9dcf8d58f81c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atomic-waker
 * [new ref]         3d76cc5b6a938961e0ddbda4404e9dcf8d58f81c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d76cc5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild