$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc-test.git /var/lib/mock/f38-build-side-43-rust-devel-1418008-31459/root/chroot_tmpdir/scmroot/rust-rustc-test
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418008-31459/root/chroot_tmpdir/scmroot/rust-rustc-test'...
$ git fetch origin 58cad6271741fc7c62edb39c3b5fa1ff4c837d2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc-test
 * [new ref]         58cad6271741fc7c62edb39c3b5fa1ff4c837d2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58cad62 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild