$ git clone -n https://src.fedoraproject.org/rpms/pioneer.git /var/lib/mock/f41-build-1472418-23777/root/chroot_tmpdir/scmroot/pioneer
Cloning into '/var/lib/mock/f41-build-1472418-23777/root/chroot_tmpdir/scmroot/pioneer'...
$ git fetch origin 868c4fb8721af8db45afb57e81a89718d327e15f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pioneer
 * [new ref]         868c4fb8721af8db45afb57e81a89718d327e15f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 868c4fb Avoid HTML files build