$ git clone -n https://src.fedoraproject.org/rpms/golang-github-agl-ed25519.git /var/lib/mock/f41-build-1421877-23566/root/chroot_tmpdir/scmroot/golang-github-agl-ed25519
Cloning into '/var/lib/mock/f41-build-1421877-23566/root/chroot_tmpdir/scmroot/golang-github-agl-ed25519'...
$ git fetch origin 355c40a9d3a306c13698ad17cc0b62ba3e792f51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-agl-ed25519
 * [new ref]         355c40a9d3a306c13698ad17cc0b62ba3e792f51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 355c40a Not required anymore and dead upstream