$ git clone -n https://src.fedoraproject.org/rpms/rust-rkyv.git /var/lib/mock/f39-build-1500039-34781/root/chroot_tmpdir/scmroot/rust-rkyv
Cloning into '/var/lib/mock/f39-build-1500039-34781/root/chroot_tmpdir/scmroot/rust-rkyv'...
$ git fetch origin 662c4ec5aaef8e929c08b94a292f4b62dfcba200:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rkyv
 * [new ref]         662c4ec5aaef8e929c08b94a292f4b62dfcba200 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 662c4ec Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild