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propellor spin

This commit is contained in:
Joey Hess 2014-04-04 18:34:03 -04:00
parent 6f9b3b2d8a
commit 0636846848
Failed to extract signature
1 changed files with 2 additions and 2 deletions
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4
Propellor/CmdLine.hs
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@ -85,9 +85,9 @@ onlyProcess :: IO a -> IO a
onlyProcess a = bracket lock unlock (const a)
where
lock = do
l <- openFd lockfile ReadWrite Nothing defaultFileFlags
l <- createFile lockfile stdFileMode
setLock l (WriteLock, AbsoluteSeek, 0, 0)
`catchIO` (const alreadyrunning)
`catchIO` const alreadyrunning
return l
unlock = closeFd
alreadyrunning = error "Propellor is already running on this host!"