$ git clone -n https://src.fedoraproject.org/rpms/gimp.git /var/lib/mock/f41-build-side-1-3128195-39561/root/chroot_tmpdir/scmroot/gimp
Cloning into '/var/lib/mock/f41-build-side-1-3128195-39561/root/chroot_tmpdir/scmroot/gimp'...
$ git fetch origin cab45ec2bdbfe263a67211678d88152b0c503fb1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp
 * [new ref]         cab45ec2bdbfe263a67211678d88152b0c503fb1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cab45ec Only package major-versioned files if default