fa040a194c
if we're unbound then the script will be called with empty ADDRESSES and so the usual case will handle this fine by removing all the previosuly set addresses
33 lines
1.0 KiB
Fennel
33 lines
1.0 KiB
Fennel
(local { : system } (require :anoia))
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(local svc (require :anoia.svc))
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(fn changes [old-addresses new-addresses]
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(let [added {}
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deleted {}]
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(each [n address (pairs new-addresses)]
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(if (not (. old-addresses n))
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(table.insert added address)))
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(each [n address (pairs old-addresses)]
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(if (not (. new-addresses n))
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(table.insert deleted address)))
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(values added deleted)))
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(fn update-addresses [wan-device addresses new-addresses]
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(let [(added deleted) (changes addresses new-addresses)]
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(each [_ p (ipairs added)]
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(system
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(.. "ip address add " p.address "/" p.len " dev " wan-device)))
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(each [_ p (ipairs deleted)]
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(system
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(.. "ip address del " p.address "/" p.len " dev " wan-device)))
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new-addresses))
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(fn run []
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(let [[state-directory wan-device] arg
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dir (svc.open state-directory)]
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(accumulate [addresses []
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v (dir:events)]
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(update-addresses wan-device addresses (v:output "address")))))
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{ : update-addresses : changes : run }
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