$ git clone -n https://src.fedoraproject.org/rpms/nettle.git /var/lib/mock/f40-build-2703718-70852/root/chroot_tmpdir/scmroot/nettle
Cloning into '/var/lib/mock/f40-build-2703718-70852/root/chroot_tmpdir/scmroot/nettle'...
$ git fetch origin 551953a4af01c4a88f7f2cfd640e9f95788c40f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nettle
 * [new ref]         551953a4af01c4a88f7f2cfd640e9f95788c40f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 551953a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild