$ git clone -n https://src.fedoraproject.org/rpms/rust-vergen.git /var/lib/mock/f38-build-side-43-rust-devel-1411790-31436/root/chroot_tmpdir/scmroot/rust-vergen
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411790-31436/root/chroot_tmpdir/scmroot/rust-vergen'...
$ git fetch origin 7e0a4054e92ca3b8cca8d0e680cf397171019980:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vergen
 * [new ref]         7e0a4054e92ca3b8cca8d0e680cf397171019980 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e0a405 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild