$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-yaml-2.git /var/lib/mock/f41-build-1036627-18741/root/chroot_tmpdir/scmroot/golang-gopkg-yaml-2
Cloning into '/var/lib/mock/f41-build-1036627-18741/root/chroot_tmpdir/scmroot/golang-gopkg-yaml-2'...
$ git fetch origin dd6997fa875b5aae4262a0926989d0547e9d078a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-yaml-2
 * [new ref]         dd6997fa875b5aae4262a0926989d0547e9d078a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd6997f Fix FTBFS