s,^( *FAI_DEBOOTSTRAP=).*,\1"$base $r",
# add --arch amd64. this is needed on arm system which is
# used to install amd64 clients. On amd64 servers, it's redundant.
s,^( *FAI_DEBOOTSTRAP=).*,\1"$base $r",
# add --arch amd64. this is needed on arm system which is
# used to install amd64 clients. On amd64 servers, it's redundant.