$ git clone -n https://src.fedoraproject.org/rpms/golang-github-fogleman-gg.git /var/lib/mock/f41-build-1421926-23566/root/chroot_tmpdir/scmroot/golang-github-fogleman-gg
Cloning into '/var/lib/mock/f41-build-1421926-23566/root/chroot_tmpdir/scmroot/golang-github-fogleman-gg'...
$ git fetch origin b016283c79c5bb601f0377913090f8327fd77f5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-fogleman-gg
 * [new ref]         b016283c79c5bb601f0377913090f8327fd77f5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b016283 Fix FTBFS