$ git clone -n https://src.fedoraproject.org/rpms/R-reprex.git /var/lib/mock/f38-build-side-42-init-devel-1025861-29689/root/chroot_tmpdir/scmroot/R-reprex
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1025861-29689/root/chroot_tmpdir/scmroot/R-reprex'...
$ git fetch origin 8ec934ccdff8aecfb8f14e9d1e641d6804c9e5df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-reprex
 * [new ref]         8ec934ccdff8aecfb8f14e9d1e641d6804c9e5df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ec934c fix build against lifecycle 1.0.3+