$ git clone -n https://src.fedoraproject.org/rpms/nettle.git /var/lib/mock/f40-build-2299370-56621/root/chroot_tmpdir/scmroot/nettle
Cloning into '/var/lib/mock/f40-build-2299370-56621/root/chroot_tmpdir/scmroot/nettle'...
$ git fetch origin d8e75e7109af5b0f0510411008ccf27157ec7bf1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nettle
 * [new ref]         d8e75e7109af5b0f0510411008ccf27157ec7bf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8e75e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild