$ git clone -n https://src.fedoraproject.org/rpms/caddy.git /var/lib/mock/f39-build-1545009-36675/root/chroot_tmpdir/scmroot/caddy
Cloning into '/var/lib/mock/f39-build-1545009-36675/root/chroot_tmpdir/scmroot/caddy'...
$ git fetch origin c245f0080fc875ec2ef9870cb0051e2b9eda5c39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/caddy
 * [new ref]         c245f0080fc875ec2ef9870cb0051e2b9eda5c39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c245f00 Test page updates