$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-kong.git /var/lib/mock/f42-build-side-1-3533504-46362/root/chroot_tmpdir/scmroot/golang-github-alecthomas-kong
Cloning into '/var/lib/mock/f42-build-side-1-3533504-46362/root/chroot_tmpdir/scmroot/golang-github-alecthomas-kong'...
$ git fetch origin 17f4a7675242388acdb25f1bc4d4d31b404945e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-kong
 * [new ref]         17f4a7675242388acdb25f1bc4d4d31b404945e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17f4a76 Update to 1.11.0 upstream release