$ git clone -n https://src.fedoraproject.org/rpms/rust-futures-timer.git /var/lib/mock/f39-build-1521670-35854/root/chroot_tmpdir/scmroot/rust-futures-timer
Cloning into '/var/lib/mock/f39-build-1521670-35854/root/chroot_tmpdir/scmroot/rust-futures-timer'...
$ git fetch origin 8185f281115cc15b24212bd554fd69401a9621f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures-timer
 * [new ref]         8185f281115cc15b24212bd554fd69401a9621f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8185f28 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild