$ git clone -n https://src.fedoraproject.org/rpms/rust-x25519-dalek.git /var/lib/mock/f45-build-46270-832/root/chroot_tmpdir/scmroot/rust-x25519-dalek
Cloning into '/var/lib/mock/f45-build-46270-832/root/chroot_tmpdir/scmroot/rust-x25519-dalek'...
$ git fetch origin 624103df073c5d10e40ae7b51fbc836d55ca8c64:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x25519-dalek
 * [new ref]         624103df073c5d10e40ae7b51fbc836d55ca8c64 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 624103d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild