$ git clone -n https://src.fedoraproject.org/rpms/R-isoband.git /var/lib/mock/f43-build-58895653-6569073/root/chroot_tmpdir/scmroot/R-isoband
Cloning into '/var/lib/mock/f43-build-58895653-6569073/root/chroot_tmpdir/scmroot/R-isoband'...
$ git fetch origin b6b24a67b95ddda5f98bac8c3aa0f0d2871440de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-isoband
 * [new ref]         b6b24a67b95ddda5f98bac8c3aa0f0d2871440de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6b24a6 R-maint-sig mass rebuild