$ git clone -n https://src.fedoraproject.org/rpms/convertall.git /var/lib/mock/f39-build-1955060-43235/root/chroot_tmpdir/scmroot/convertall
Cloning into '/var/lib/mock/f39-build-1955060-43235/root/chroot_tmpdir/scmroot/convertall'...
$ git fetch origin 796b30cbab8c07844ca7f329fa6998f7aa75df3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/convertall
 * [new ref]         796b30cbab8c07844ca7f329fa6998f7aa75df3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 796b30c Update URLs, import upstream units changes