$ git clone -n https://src.fedoraproject.org/rpms/R-covr.git /var/lib/mock/f40-build-1930432-25111/root/chroot_tmpdir/scmroot/R-covr
Cloning into '/var/lib/mock/f40-build-1930432-25111/root/chroot_tmpdir/scmroot/R-covr'...
$ git fetch origin 7d1303916cb3666047338717c3303b9aeeba4197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-covr
 * [new ref]         7d1303916cb3666047338717c3303b9aeeba4197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d13039 R-maint-sig mass rebuild