$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-russross-blackfriday-2.git /var/lib/mock/f41-build-1036613-18741/root/chroot_tmpdir/scmroot/golang-gopkg-russross-blackfriday-2
Cloning into '/var/lib/mock/f41-build-1036613-18741/root/chroot_tmpdir/scmroot/golang-gopkg-russross-blackfriday-2'...
$ git fetch origin 6f053b6dd3e3ab72b6f18ed162bc89efd112ef1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-russross-blackfriday-2
 * [new ref]         6f053b6dd3e3ab72b6f18ed162bc89efd112ef1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f053b6 Fix FTBFS