$ git clone -n https://src.fedoraproject.org/rpms/ed25519-java.git /var/lib/mock/f41-build-1144722-21153/root/chroot_tmpdir/scmroot/ed25519-java
Cloning into '/var/lib/mock/f41-build-1144722-21153/root/chroot_tmpdir/scmroot/ed25519-java'...
$ git fetch origin b83ff0b6399d4add41890c4f069b0163e7dfcab0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ed25519-java
 * [new ref]         b83ff0b6399d4add41890c4f069b0163e7dfcab0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b83ff0b Eliminate use of obsolete %patchN syntax (#2283636)