$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ed25519.git /var/lib/mock/f40-build-2224118-52768/root/chroot_tmpdir/scmroot/rubygem-ed25519
Cloning into '/var/lib/mock/f40-build-2224118-52768/root/chroot_tmpdir/scmroot/rubygem-ed25519'...
$ git fetch origin eb7d4c37257e57b6ac3d569ae50eb7b93b5fb18e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ed25519
 * [new ref]         eb7d4c37257e57b6ac3d569ae50eb7b93b5fb18e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb7d4c3 Rebuilt for https://fedoraproject.org/wiki/Changes/Ruby_3.3