lsyncd/examples/lpostcmd.lua

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-----
-- User configuration file for lsyncd.
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-- This needs lsyncd >= 2.0.3
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--
-- This configuration will execute a command on the remote host
-- after every successfullycompleted rsync operation.
-- for example to restart servlets on the target host or so.
local rsyncpostcmd = {
-- based on default rsync.
default.rsync,
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checkgauge = {
default.rsync.checkgauge,
host = true,
targetdir = true,
target = true,
postcmd = true,
},
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-- for this config it is important to keep maxProcesses at 1, so
-- the postcmds will only be spawned after the rsync completed
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maxProcesses = 1,
-- called whenever something is to be done
action = function(inlet)
local event = inlet.getEvent()
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local config = inlet.getConfig()
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-- if the event is a blanket event and not the startup,
-- its there to spawn the webservice restart at the target.
if event.etype == "Blanket" then
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-- uses rawget to test if "isPostcmd" has been set without
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-- triggering an error if not.
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local isPostcmd = rawget(event, "isPostcmd")
if isPostcmd then
spawn(event, "/usr/bin/ssh",
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config.host, config.postcmd)
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return
else
-- this is the startup, forwards it to default routine.
return default.rsync.action(inlet)
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end
error("this should never be reached")
end
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-- for any other event, a blanket event is created that
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-- will stack on the queue and do the postcmd when its finished
local sync = inlet.createBlanketEvent()
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sync.isPostcmd = true
-- the original event is simply forwarded to the normal action handler
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return default.rsync.action(inlet)
end,
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-- called when a process exited.
-- this can be a rsync command, the startup rsync or the postcmd
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collect = function(agent, exitcode)
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-- for the ssh commands 255 is network error -> try again
local isPostcmd = rawget(agent, "isPostcmd")
if not agent.isList and agent.etype == "Blanket" and isPostcmd then
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if exitcode == 255 then
return "again"
end
return
else
--- everything else, forward to default collection handler
return default.collect(agent,exitcode)
end
error("this should never be reached")
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end,
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-- called before anything else
-- builds the target from host and targetdir
prepare = function(config, level, skipTarget)
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if not config.host then
error("rsyncpostcmd neets 'host' configured", 4)
end
if not config.targetdir then
error("rsyncpostcmd needs 'targetdir' configured", 4)
end
if not config.target then
config.target = config.host .. ":" .. config.targetdir
end
return default.rsync.prepare(config, level, skipTarget)
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end
}
sync {
rsyncpostcmd,
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source = "src",
host = "beetle",
targetdir = "/path/to/trg",
postcmd = "/usr/local/bin/restart-servelt.sh",
}