$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_core0.3.git /var/lib/mock/f38-build-side-42-init-devel-1394984-31050/root/chroot_tmpdir/scmroot/rust-rand_core0.3
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394984-31050/root/chroot_tmpdir/scmroot/rust-rand_core0.3'...
$ git fetch origin be3ebd0fe9d6b90c8af1cff235a0b9241164302c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_core0.3
 * [new ref]         be3ebd0fe9d6b90c8af1cff235a0b9241164302c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be3ebd0 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild