$ git clone -n https://src.fedoraproject.org/rpms/golang-github-liamg-tml.git /var/lib/mock/f42-build-866461-173920/root/chroot_tmpdir/scmroot/golang-github-liamg-tml
Cloning into '/var/lib/mock/f42-build-866461-173920/root/chroot_tmpdir/scmroot/golang-github-liamg-tml'...
$ git fetch origin cd06f2d68826b6a326d8255d6781649fcd1124bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-liamg-tml
 * [new ref]         cd06f2d68826b6a326d8255d6781649fcd1124bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd06f2d Update to latest upstream release (closes rhbz#2277198)