m scp $source:/a/bin/distro-setup/btrbk-run $tmpf
if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
e "found different version on host $source. reexecing"
m scp $source:/a/bin/distro-setup/btrbk-run $tmpf
if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
e "found different version on host $source. reexecing"