$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ed25519.git /var/lib/mock/f39-build-1500550-34790/root/chroot_tmpdir/scmroot/rubygem-ed25519
Cloning into '/var/lib/mock/f39-build-1500550-34790/root/chroot_tmpdir/scmroot/rubygem-ed25519'...
$ git fetch origin 9033f98dd38cd079b83cbdd7950b0906d4573bcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ed25519
 * [new ref]         9033f98dd38cd079b83cbdd7950b0906d4573bcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9033f98 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild