$ git clone -n https://src.fedoraproject.org/rpms/rust-env_proxy.git /var/lib/mock/f39-build-1488951-34501/root/chroot_tmpdir/scmroot/rust-env_proxy
Cloning into '/var/lib/mock/f39-build-1488951-34501/root/chroot_tmpdir/scmroot/rust-env_proxy'...
$ git fetch origin 68e87c7da0c905ab8e38a24cf41b4f76dc47af07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-env_proxy
 * [new ref]         68e87c7da0c905ab8e38a24cf41b4f76dc47af07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68e87c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild