$ git clone -n https://src.fedoraproject.org/rpms/golang-github-zmap-rc2.git /var/lib/mock/f41-build-1036541-18736/root/chroot_tmpdir/scmroot/golang-github-zmap-rc2
Cloning into '/var/lib/mock/f41-build-1036541-18736/root/chroot_tmpdir/scmroot/golang-github-zmap-rc2'...
$ git fetch origin 09c3c1a2078027df6ba0779a6ddce33255a7d146:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-zmap-rc2
 * [new ref]         09c3c1a2078027df6ba0779a6ddce33255a7d146 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09c3c1a Fix FTBFS