ssh_opts = "-oPasswordAuthentication=no -oChallengeResponseAuthentication=no"
has_ssh = function(host) {
status = system(paste("ssh", ssh_opts, host, "'exit'"), wait=TRUE,
ignore.stdout=TRUE, ignore.stderr=TRUE)
status == 0
}
has_ssh_cmq = function(host) {
status = suppressWarnings(
system(paste("ssh", ssh_opts, host, "'R -e \"library(clustermq)\"'"),
wait=TRUE, ignore.stdout=TRUE, ignore.stderr=TRUE))
status == 0
}
has_cmq = function(host) {
status = system("R -e 'library(clustermq)'", wait=TRUE,
ignore.stdout=TRUE, ignore.stderr=TRUE)
status == 0
}
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