$ git clone -n https://src.fedoraproject.org/rpms/golang-github-gobuffalo-packr.git /var/lib/mock/f41-build-1035690-18673/root/chroot_tmpdir/scmroot/golang-github-gobuffalo-packr
Cloning into '/var/lib/mock/f41-build-1035690-18673/root/chroot_tmpdir/scmroot/golang-github-gobuffalo-packr'...
$ git fetch origin d24b85d6a302fcd29521ae65f156f108f8b27155:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-gobuffalo-packr
 * [new ref]         d24b85d6a302fcd29521ae65f156f108f8b27155 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d24b85d Fix FTBFS