64 lines
2.1 KiB
Fennel
64 lines
2.1 KiB
Fennel
(local nl (require :anoia.nl))
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(local { : assoc : system } (require :anoia))
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; (local { : view} (require :fennel))
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(fn parse-args [args]
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(match args
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["-v" & rest] (assoc (parse-args rest) :verbose true)
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["-t" timeout & rest] (assoc (parse-args rest) :timeout (tonumber timeout))
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["-s" service & rest] (assoc (parse-args rest) :service service)
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[linkname "up"] {:link linkname :expecting "up"}
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[linkname "running"] {:link linkname :expecting "running"}
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[linkname "present"] {:link linkname :expecting "present"}
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[linkname nil] {:link linkname :expecting "present"}
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_ nil))
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(fn event-matches? [params v]
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(let [got
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(match v
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;; - up: Reflects the administrative state of the interface (IFF_UP)
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;; - running: Reflects the operational state (IFF_RUNNING).
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{:event "newlink" :name params.link :up :yes :running :yes}
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{:present true :up true :running true}
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{:event "newlink" :name params.link :up :yes}
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{:present :true :up true}
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{:event "newlink" :name params.link}
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{:present true }
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_
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{})]
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(not (not (. got params.expecting)))))
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(var up :unknown)
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(fn toggle-service [service wanted?]
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(when (not (= up wanted?))
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(set up
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(if wanted?
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(pcall system (.. "s6-rc -u change " service))
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(not (pcall system (.. "s6-rc -d change " service)))))
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))
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(fn run [args event-fn]
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(set up :unknown)
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(let [parameters
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(assert (parse-args args)
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(.. "Usage: ifwait [-v] ifname [present|up|running]"))]
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(when parameters.verbose
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(print (.. "ifwait: waiting for "
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parameters.link " to be " parameters.expecting)))
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(if parameters.service
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(each [e (event-fn)]
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(if (= e.name parameters.link)
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(toggle-service parameters.service (event-matches? parameters e))))
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(each [e (event-fn)
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&until (event-matches? parameters e)]
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true))))
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(when (not (= (. arg 0) "test"))
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(run arg #(nl.events {:link true})))
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{ : run }
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