root / htools / Ganeti / Daemon.hs @ 8d2b6a12
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1 | 6ec7a50e | Iustin Pop | {-| Implementation of the generic daemon functionality. |
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2 | 6ec7a50e | Iustin Pop | |
3 | 6ec7a50e | Iustin Pop | -} |
4 | 6ec7a50e | Iustin Pop | |
5 | 6ec7a50e | Iustin Pop | {- |
6 | 6ec7a50e | Iustin Pop | |
7 | 6ec7a50e | Iustin Pop | Copyright (C) 2011, 2012 Google Inc. |
8 | 6ec7a50e | Iustin Pop | |
9 | 6ec7a50e | Iustin Pop | This program is free software; you can redistribute it and/or modify |
10 | 6ec7a50e | Iustin Pop | it under the terms of the GNU General Public License as published by |
11 | 6ec7a50e | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
12 | 6ec7a50e | Iustin Pop | (at your option) any later version. |
13 | 6ec7a50e | Iustin Pop | |
14 | 6ec7a50e | Iustin Pop | This program is distributed in the hope that it will be useful, but |
15 | 6ec7a50e | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | 6ec7a50e | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | 6ec7a50e | Iustin Pop | General Public License for more details. |
18 | 6ec7a50e | Iustin Pop | |
19 | 6ec7a50e | Iustin Pop | You should have received a copy of the GNU General Public License |
20 | 6ec7a50e | Iustin Pop | along with this program; if not, write to the Free Software |
21 | 6ec7a50e | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 | 6ec7a50e | Iustin Pop | 02110-1301, USA. |
23 | 6ec7a50e | Iustin Pop | |
24 | 6ec7a50e | Iustin Pop | -} |
25 | 6ec7a50e | Iustin Pop | |
26 | 6ec7a50e | Iustin Pop | module Ganeti.Daemon |
27 | 6ec7a50e | Iustin Pop | ( DaemonOptions(..) |
28 | 6ec7a50e | Iustin Pop | , OptType |
29 | 6ec7a50e | Iustin Pop | , defaultOptions |
30 | 6ec7a50e | Iustin Pop | , oShowHelp |
31 | 6ec7a50e | Iustin Pop | , oShowVer |
32 | 6ec7a50e | Iustin Pop | , oNoDaemonize |
33 | 6ec7a50e | Iustin Pop | , oNoUserChecks |
34 | 6ec7a50e | Iustin Pop | , oDebug |
35 | 6ec7a50e | Iustin Pop | , oPort |
36 | 152e05e1 | Iustin Pop | , oBindAddress |
37 | b714ff89 | Iustin Pop | , oSyslogUsage |
38 | 6ec7a50e | Iustin Pop | , parseArgs |
39 | 152e05e1 | Iustin Pop | , parseAddress |
40 | 0d0ac025 | Iustin Pop | , cleanupSocket |
41 | 6ec7a50e | Iustin Pop | , writePidFile |
42 | 6ec7a50e | Iustin Pop | , genericMain |
43 | 6ec7a50e | Iustin Pop | ) where |
44 | 6ec7a50e | Iustin Pop | |
45 | 79ac58fa | Iustin Pop | import Control.Exception |
46 | 6ec7a50e | Iustin Pop | import Control.Monad |
47 | 0c28bee1 | Iustin Pop | import Data.Maybe (fromMaybe) |
48 | 6ec7a50e | Iustin Pop | import qualified Data.Version |
49 | 6ec7a50e | Iustin Pop | import Data.Word |
50 | 0c28bee1 | Iustin Pop | import GHC.IO.Handle (hDuplicateTo) |
51 | 152e05e1 | Iustin Pop | import qualified Network.Socket as Socket |
52 | 79ac58fa | Iustin Pop | import Prelude hiding (catch) |
53 | 6ec7a50e | Iustin Pop | import System.Console.GetOpt |
54 | 6ec7a50e | Iustin Pop | import System.Exit |
55 | 6ec7a50e | Iustin Pop | import System.Environment |
56 | 6ec7a50e | Iustin Pop | import System.Info |
57 | 6ec7a50e | Iustin Pop | import System.IO |
58 | 0d0ac025 | Iustin Pop | import System.IO.Error (isDoesNotExistError) |
59 | 6ec7a50e | Iustin Pop | import System.Posix.Directory |
60 | 6ec7a50e | Iustin Pop | import System.Posix.Files |
61 | 6ec7a50e | Iustin Pop | import System.Posix.IO |
62 | 6ec7a50e | Iustin Pop | import System.Posix.Process |
63 | 6ec7a50e | Iustin Pop | import System.Posix.Types |
64 | 36691f08 | Iustin Pop | import System.Posix.Signals |
65 | 6ec7a50e | Iustin Pop | import Text.Printf |
66 | 6ec7a50e | Iustin Pop | |
67 | 6ec7a50e | Iustin Pop | import Ganeti.Logging |
68 | 6ec7a50e | Iustin Pop | import Ganeti.Runtime |
69 | 6ec7a50e | Iustin Pop | import Ganeti.BasicTypes |
70 | 6ec7a50e | Iustin Pop | import Ganeti.HTools.Utils |
71 | 2997cb0a | Iustin Pop | import qualified Ganeti.Version as Version (version) |
72 | 6ec7a50e | Iustin Pop | import qualified Ganeti.Constants as C |
73 | 152e05e1 | Iustin Pop | import qualified Ganeti.Ssconf as Ssconf |
74 | 6ec7a50e | Iustin Pop | |
75 | 0c28bee1 | Iustin Pop | -- * Constants |
76 | 0c28bee1 | Iustin Pop | |
77 | 0c28bee1 | Iustin Pop | -- | \/dev\/null path. |
78 | 0c28bee1 | Iustin Pop | devNull :: FilePath |
79 | 0c28bee1 | Iustin Pop | devNull = "/dev/null" |
80 | 0c28bee1 | Iustin Pop | |
81 | 6ec7a50e | Iustin Pop | -- * Data types |
82 | 6ec7a50e | Iustin Pop | |
83 | 6ec7a50e | Iustin Pop | -- | Command line options structure. |
84 | 6ec7a50e | Iustin Pop | data DaemonOptions = DaemonOptions |
85 | 6ec7a50e | Iustin Pop | { optShowHelp :: Bool -- ^ Just show the help |
86 | 6ec7a50e | Iustin Pop | , optShowVer :: Bool -- ^ Just show the program version |
87 | 6ec7a50e | Iustin Pop | , optDaemonize :: Bool -- ^ Whether to daemonize or not |
88 | 6ec7a50e | Iustin Pop | , optPort :: Maybe Word16 -- ^ Override for the network port |
89 | 6ec7a50e | Iustin Pop | , optDebug :: Bool -- ^ Enable debug messages |
90 | 6ec7a50e | Iustin Pop | , optNoUserChecks :: Bool -- ^ Ignore user checks |
91 | 152e05e1 | Iustin Pop | , optBindAddress :: Maybe String -- ^ Override for the bind address |
92 | b714ff89 | Iustin Pop | , optSyslogUsage :: Maybe SyslogUsage -- ^ Override for Syslog usage |
93 | 6ec7a50e | Iustin Pop | } |
94 | 6ec7a50e | Iustin Pop | |
95 | 6ec7a50e | Iustin Pop | -- | Default values for the command line options. |
96 | 6ec7a50e | Iustin Pop | defaultOptions :: DaemonOptions |
97 | 6ec7a50e | Iustin Pop | defaultOptions = DaemonOptions |
98 | 6ec7a50e | Iustin Pop | { optShowHelp = False |
99 | 6ec7a50e | Iustin Pop | , optShowVer = False |
100 | 6ec7a50e | Iustin Pop | , optDaemonize = True |
101 | 6ec7a50e | Iustin Pop | , optPort = Nothing |
102 | 6ec7a50e | Iustin Pop | , optDebug = False |
103 | 6ec7a50e | Iustin Pop | , optNoUserChecks = False |
104 | 152e05e1 | Iustin Pop | , optBindAddress = Nothing |
105 | b714ff89 | Iustin Pop | , optSyslogUsage = Nothing |
106 | 6ec7a50e | Iustin Pop | } |
107 | 6ec7a50e | Iustin Pop | |
108 | 6ec7a50e | Iustin Pop | -- | Abrreviation for the option type. |
109 | 6ec7a50e | Iustin Pop | type OptType = OptDescr (DaemonOptions -> Result DaemonOptions) |
110 | 6ec7a50e | Iustin Pop | |
111 | 6ec7a50e | Iustin Pop | -- | Helper function for required arguments which need to be converted |
112 | 6ec7a50e | Iustin Pop | -- as opposed to stored just as string. |
113 | 6ec7a50e | Iustin Pop | reqWithConversion :: (String -> Result a) |
114 | 6ec7a50e | Iustin Pop | -> (a -> DaemonOptions -> Result DaemonOptions) |
115 | 6ec7a50e | Iustin Pop | -> String |
116 | 6ec7a50e | Iustin Pop | -> ArgDescr (DaemonOptions -> Result DaemonOptions) |
117 | 6ec7a50e | Iustin Pop | reqWithConversion conversion_fn updater_fn metavar = |
118 | 6ec7a50e | Iustin Pop | ReqArg (\string_opt opts -> do |
119 | 6ec7a50e | Iustin Pop | parsed_value <- conversion_fn string_opt |
120 | 6ec7a50e | Iustin Pop | updater_fn parsed_value opts) metavar |
121 | 6ec7a50e | Iustin Pop | |
122 | 6ec7a50e | Iustin Pop | -- * Command line options |
123 | 6ec7a50e | Iustin Pop | |
124 | 6ec7a50e | Iustin Pop | oShowHelp :: OptType |
125 | 6ec7a50e | Iustin Pop | oShowHelp = Option "h" ["help"] |
126 | 6ec7a50e | Iustin Pop | (NoArg (\ opts -> Ok opts { optShowHelp = True})) |
127 | 6ec7a50e | Iustin Pop | "Show the help message and exit" |
128 | 6ec7a50e | Iustin Pop | |
129 | 6ec7a50e | Iustin Pop | oShowVer :: OptType |
130 | 6ec7a50e | Iustin Pop | oShowVer = Option "V" ["version"] |
131 | 6ec7a50e | Iustin Pop | (NoArg (\ opts -> Ok opts { optShowVer = True})) |
132 | 6ec7a50e | Iustin Pop | "Show the version of the program and exit" |
133 | 6ec7a50e | Iustin Pop | |
134 | 6ec7a50e | Iustin Pop | oNoDaemonize :: OptType |
135 | 6ec7a50e | Iustin Pop | oNoDaemonize = Option "f" ["foreground"] |
136 | 6ec7a50e | Iustin Pop | (NoArg (\ opts -> Ok opts { optDaemonize = False})) |
137 | 6ec7a50e | Iustin Pop | "Don't detach from the current terminal" |
138 | 6ec7a50e | Iustin Pop | |
139 | 6ec7a50e | Iustin Pop | oDebug :: OptType |
140 | 6ec7a50e | Iustin Pop | oDebug = Option "d" ["debug"] |
141 | 6ec7a50e | Iustin Pop | (NoArg (\ opts -> Ok opts { optDebug = True })) |
142 | 6ec7a50e | Iustin Pop | "Enable debug messages" |
143 | 6ec7a50e | Iustin Pop | |
144 | 6ec7a50e | Iustin Pop | oNoUserChecks :: OptType |
145 | 6ec7a50e | Iustin Pop | oNoUserChecks = Option "" ["no-user-checks"] |
146 | 6ec7a50e | Iustin Pop | (NoArg (\ opts -> Ok opts { optNoUserChecks = True })) |
147 | 6ec7a50e | Iustin Pop | "Ignore user checks" |
148 | 6ec7a50e | Iustin Pop | |
149 | 6ec7a50e | Iustin Pop | oPort :: Int -> OptType |
150 | e6812a1a | Iustin Pop | oPort def = Option "p" ["port"] |
151 | 6ec7a50e | Iustin Pop | (reqWithConversion (tryRead "reading port") |
152 | 6ec7a50e | Iustin Pop | (\port opts -> Ok opts { optPort = Just port }) "PORT") |
153 | 6ec7a50e | Iustin Pop | ("Network port (default: " ++ show def ++ ")") |
154 | 6ec7a50e | Iustin Pop | |
155 | 152e05e1 | Iustin Pop | oBindAddress :: OptType |
156 | 152e05e1 | Iustin Pop | oBindAddress = Option "b" ["bind"] |
157 | 152e05e1 | Iustin Pop | (ReqArg (\addr opts -> Ok opts { optBindAddress = Just addr }) |
158 | 152e05e1 | Iustin Pop | "ADDR") |
159 | 152e05e1 | Iustin Pop | "Bind address (default depends on cluster configuration)" |
160 | 152e05e1 | Iustin Pop | |
161 | b714ff89 | Iustin Pop | oSyslogUsage :: OptType |
162 | b714ff89 | Iustin Pop | oSyslogUsage = Option "" ["syslog"] |
163 | b714ff89 | Iustin Pop | (reqWithConversion syslogUsageFromRaw |
164 | b714ff89 | Iustin Pop | (\su opts -> Ok opts { optSyslogUsage = Just su }) |
165 | b714ff89 | Iustin Pop | "SYSLOG") |
166 | b714ff89 | Iustin Pop | ("Enable logging to syslog (except debug \ |
167 | b714ff89 | Iustin Pop | \messages); one of 'no', 'yes' or 'only' [" ++ C.syslogUsage ++ |
168 | b714ff89 | Iustin Pop | "]") |
169 | b714ff89 | Iustin Pop | |
170 | 6ec7a50e | Iustin Pop | -- | Usage info. |
171 | 6ec7a50e | Iustin Pop | usageHelp :: String -> [OptType] -> String |
172 | 6ec7a50e | Iustin Pop | usageHelp progname = |
173 | 6ec7a50e | Iustin Pop | usageInfo (printf "%s %s\nUsage: %s [OPTION...]" |
174 | 6ec7a50e | Iustin Pop | progname Version.version progname) |
175 | 6ec7a50e | Iustin Pop | |
176 | 6ec7a50e | Iustin Pop | -- | Command line parser, using the 'Options' structure. |
177 | 6ec7a50e | Iustin Pop | parseOpts :: [String] -- ^ The command line arguments |
178 | 6ec7a50e | Iustin Pop | -> String -- ^ The program name |
179 | 6ec7a50e | Iustin Pop | -> [OptType] -- ^ The supported command line options |
180 | 6ec7a50e | Iustin Pop | -> IO (DaemonOptions, [String]) -- ^ The resulting options |
181 | 6ec7a50e | Iustin Pop | -- and leftover arguments |
182 | 6ec7a50e | Iustin Pop | parseOpts argv progname options = |
183 | 6ec7a50e | Iustin Pop | case getOpt Permute options argv of |
184 | 6ec7a50e | Iustin Pop | (opt_list, args, []) -> |
185 | 6ec7a50e | Iustin Pop | do |
186 | 6ec7a50e | Iustin Pop | parsed_opts <- |
187 | 88a10df5 | Iustin Pop | exitIfBad "Error while parsing command line arguments" $ |
188 | 88a10df5 | Iustin Pop | foldM (flip id) defaultOptions opt_list |
189 | 6ec7a50e | Iustin Pop | return (parsed_opts, args) |
190 | 6ec7a50e | Iustin Pop | (_, _, errs) -> do |
191 | 6ec7a50e | Iustin Pop | hPutStrLn stderr $ "Command line error: " ++ concat errs |
192 | 6ec7a50e | Iustin Pop | hPutStrLn stderr $ usageHelp progname options |
193 | 6ec7a50e | Iustin Pop | exitWith $ ExitFailure 2 |
194 | 6ec7a50e | Iustin Pop | |
195 | 6ec7a50e | Iustin Pop | -- | Small wrapper over getArgs and 'parseOpts'. |
196 | 6ec7a50e | Iustin Pop | parseArgs :: String -> [OptType] -> IO (DaemonOptions, [String]) |
197 | 6ec7a50e | Iustin Pop | parseArgs cmd options = do |
198 | 6ec7a50e | Iustin Pop | cmd_args <- getArgs |
199 | 6ec7a50e | Iustin Pop | parseOpts cmd_args cmd options |
200 | 6ec7a50e | Iustin Pop | |
201 | 6ec7a50e | Iustin Pop | -- * Daemon-related functions |
202 | 6ec7a50e | Iustin Pop | -- | PID file mode. |
203 | 6ec7a50e | Iustin Pop | pidFileMode :: FileMode |
204 | 6ec7a50e | Iustin Pop | pidFileMode = unionFileModes ownerReadMode ownerWriteMode |
205 | 6ec7a50e | Iustin Pop | |
206 | 6ec7a50e | Iustin Pop | -- | Writes a PID file and locks it. |
207 | 6ec7a50e | Iustin Pop | _writePidFile :: FilePath -> IO Fd |
208 | 6ec7a50e | Iustin Pop | _writePidFile path = do |
209 | 6ec7a50e | Iustin Pop | fd <- createFile path pidFileMode |
210 | 6ec7a50e | Iustin Pop | setLock fd (WriteLock, AbsoluteSeek, 0, 0) |
211 | 6ec7a50e | Iustin Pop | my_pid <- getProcessID |
212 | 6ec7a50e | Iustin Pop | _ <- fdWrite fd (show my_pid ++ "\n") |
213 | 6ec7a50e | Iustin Pop | return fd |
214 | 6ec7a50e | Iustin Pop | |
215 | 79ac58fa | Iustin Pop | -- | Helper to format an IOError. |
216 | 79ac58fa | Iustin Pop | formatIOError :: String -> IOError -> String |
217 | 79ac58fa | Iustin Pop | formatIOError msg err = msg ++ ": " ++ show err |
218 | 79ac58fa | Iustin Pop | |
219 | 6ec7a50e | Iustin Pop | -- | Wrapper over '_writePidFile' that transforms IO exceptions into a |
220 | 6ec7a50e | Iustin Pop | -- 'Bad' value. |
221 | 6ec7a50e | Iustin Pop | writePidFile :: FilePath -> IO (Result Fd) |
222 | 6ec7a50e | Iustin Pop | writePidFile path = do |
223 | 79ac58fa | Iustin Pop | catch (fmap Ok $ _writePidFile path) |
224 | 79ac58fa | Iustin Pop | (return . Bad . formatIOError "Failure during writing of the pid file") |
225 | 6ec7a50e | Iustin Pop | |
226 | 0d0ac025 | Iustin Pop | -- | Helper function to ensure a socket doesn't exist. Should only be |
227 | 0d0ac025 | Iustin Pop | -- called once we have locked the pid file successfully. |
228 | 0d0ac025 | Iustin Pop | cleanupSocket :: FilePath -> IO () |
229 | 0d0ac025 | Iustin Pop | cleanupSocket socketPath = do |
230 | 0d0ac025 | Iustin Pop | catchJust (guard . isDoesNotExistError) (removeLink socketPath) |
231 | 0d0ac025 | Iustin Pop | (const $ return ()) |
232 | 0d0ac025 | Iustin Pop | |
233 | 6ec7a50e | Iustin Pop | -- | Sets up a daemon's environment. |
234 | 6ec7a50e | Iustin Pop | setupDaemonEnv :: FilePath -> FileMode -> IO () |
235 | 6ec7a50e | Iustin Pop | setupDaemonEnv cwd umask = do |
236 | 6ec7a50e | Iustin Pop | changeWorkingDirectory cwd |
237 | 6ec7a50e | Iustin Pop | _ <- setFileCreationMask umask |
238 | 6ec7a50e | Iustin Pop | _ <- createSession |
239 | 6ec7a50e | Iustin Pop | return () |
240 | 6ec7a50e | Iustin Pop | |
241 | 36691f08 | Iustin Pop | -- | Signal handler for reopening log files. |
242 | 36691f08 | Iustin Pop | handleSigHup :: FilePath -> IO () |
243 | 36691f08 | Iustin Pop | handleSigHup path = do |
244 | 36691f08 | Iustin Pop | setupDaemonFDs (Just path) |
245 | 36691f08 | Iustin Pop | logInfo "Reopening log files after receiving SIGHUP" |
246 | 36691f08 | Iustin Pop | |
247 | 0c28bee1 | Iustin Pop | -- | Sets up a daemon's standard file descriptors. |
248 | 0c28bee1 | Iustin Pop | setupDaemonFDs :: Maybe FilePath -> IO () |
249 | 0c28bee1 | Iustin Pop | setupDaemonFDs logfile = do |
250 | 0c28bee1 | Iustin Pop | null_in_handle <- openFile devNull ReadMode |
251 | 0c28bee1 | Iustin Pop | null_out_handle <- openFile (fromMaybe devNull logfile) AppendMode |
252 | 0c28bee1 | Iustin Pop | hDuplicateTo null_in_handle stdin |
253 | 0c28bee1 | Iustin Pop | hDuplicateTo null_out_handle stdout |
254 | 0c28bee1 | Iustin Pop | hDuplicateTo null_out_handle stderr |
255 | 0c28bee1 | Iustin Pop | hClose null_in_handle |
256 | 0c28bee1 | Iustin Pop | hClose null_out_handle |
257 | 0c28bee1 | Iustin Pop | |
258 | 152e05e1 | Iustin Pop | -- | Computes the default bind address for a given family. |
259 | 152e05e1 | Iustin Pop | defaultBindAddr :: Int -- ^ The port we want |
260 | 152e05e1 | Iustin Pop | -> Socket.Family -- ^ The cluster IP family |
261 | 152e05e1 | Iustin Pop | -> Result (Socket.Family, Socket.SockAddr) |
262 | 152e05e1 | Iustin Pop | defaultBindAddr port Socket.AF_INET = |
263 | 152e05e1 | Iustin Pop | Ok $ (Socket.AF_INET, |
264 | 152e05e1 | Iustin Pop | Socket.SockAddrInet (fromIntegral port) Socket.iNADDR_ANY) |
265 | 152e05e1 | Iustin Pop | defaultBindAddr port Socket.AF_INET6 = |
266 | 152e05e1 | Iustin Pop | Ok $ (Socket.AF_INET6, |
267 | 152e05e1 | Iustin Pop | Socket.SockAddrInet6 (fromIntegral port) 0 Socket.iN6ADDR_ANY 0) |
268 | 152e05e1 | Iustin Pop | defaultBindAddr _ fam = Bad $ "Unsupported address family: " ++ show fam |
269 | 152e05e1 | Iustin Pop | |
270 | 152e05e1 | Iustin Pop | -- | Default hints for the resolver |
271 | 152e05e1 | Iustin Pop | resolveAddrHints :: Maybe Socket.AddrInfo |
272 | 152e05e1 | Iustin Pop | resolveAddrHints = |
273 | 152e05e1 | Iustin Pop | Just Socket.defaultHints { Socket.addrFlags = [Socket.AI_NUMERICHOST, |
274 | 152e05e1 | Iustin Pop | Socket.AI_NUMERICSERV] } |
275 | 152e05e1 | Iustin Pop | |
276 | 152e05e1 | Iustin Pop | -- | Resolves a numeric address. |
277 | 152e05e1 | Iustin Pop | resolveAddr :: Int -> String -> IO (Result (Socket.Family, Socket.SockAddr)) |
278 | 152e05e1 | Iustin Pop | resolveAddr port str = do |
279 | 152e05e1 | Iustin Pop | resolved <- Socket.getAddrInfo resolveAddrHints (Just str) (Just (show port)) |
280 | 152e05e1 | Iustin Pop | return $ case resolved of |
281 | 152e05e1 | Iustin Pop | [] -> Bad "Invalid results from lookup?" |
282 | 152e05e1 | Iustin Pop | best:_ -> Ok $ (Socket.addrFamily best, Socket.addrAddress best) |
283 | 152e05e1 | Iustin Pop | |
284 | 152e05e1 | Iustin Pop | -- | Based on the options, compute the socket address to use for the |
285 | 152e05e1 | Iustin Pop | -- daemon. |
286 | 152e05e1 | Iustin Pop | parseAddress :: DaemonOptions -- ^ Command line options |
287 | 152e05e1 | Iustin Pop | -> Int -- ^ Default port for this daemon |
288 | 152e05e1 | Iustin Pop | -> IO (Result (Socket.Family, Socket.SockAddr)) |
289 | 152e05e1 | Iustin Pop | parseAddress opts defport = do |
290 | 152e05e1 | Iustin Pop | let port = maybe defport fromIntegral $ optPort opts |
291 | 152e05e1 | Iustin Pop | def_family <- Ssconf.getPrimaryIPFamily Nothing |
292 | 152e05e1 | Iustin Pop | ainfo <- case optBindAddress opts of |
293 | 152e05e1 | Iustin Pop | Nothing -> return (def_family >>= defaultBindAddr port) |
294 | 152e05e1 | Iustin Pop | Just saddr -> catch (resolveAddr port saddr) |
295 | 152e05e1 | Iustin Pop | (annotateIOError $ "Invalid address " ++ saddr) |
296 | 152e05e1 | Iustin Pop | return ainfo |
297 | 152e05e1 | Iustin Pop | |
298 | 6ec7a50e | Iustin Pop | -- | Run an I/O action as a daemon. |
299 | 6ec7a50e | Iustin Pop | -- |
300 | 6ec7a50e | Iustin Pop | -- WARNING: this only works in single-threaded mode (either using the |
301 | 6ec7a50e | Iustin Pop | -- single-threaded runtime, or using the multi-threaded one but with |
302 | 6ec7a50e | Iustin Pop | -- only one OS thread, i.e. -N1). |
303 | 6ec7a50e | Iustin Pop | -- |
304 | 6ec7a50e | Iustin Pop | -- FIXME: this doesn't support error reporting and the prepfn |
305 | 6ec7a50e | Iustin Pop | -- functionality. |
306 | 0c28bee1 | Iustin Pop | daemonize :: FilePath -> IO () -> IO () |
307 | 0c28bee1 | Iustin Pop | daemonize logfile action = do |
308 | 6ec7a50e | Iustin Pop | -- first fork |
309 | 6ec7a50e | Iustin Pop | _ <- forkProcess $ do |
310 | 6ec7a50e | Iustin Pop | -- in the child |
311 | 6ec7a50e | Iustin Pop | setupDaemonEnv "/" (unionFileModes groupModes otherModes) |
312 | 0c28bee1 | Iustin Pop | setupDaemonFDs $ Just logfile |
313 | 36691f08 | Iustin Pop | _ <- installHandler lostConnection (Catch (handleSigHup logfile)) Nothing |
314 | 6ec7a50e | Iustin Pop | _ <- forkProcess action |
315 | 6ec7a50e | Iustin Pop | exitImmediately ExitSuccess |
316 | 6ec7a50e | Iustin Pop | exitImmediately ExitSuccess |
317 | 6ec7a50e | Iustin Pop | |
318 | 6ec7a50e | Iustin Pop | -- | Generic daemon startup. |
319 | 6ec7a50e | Iustin Pop | genericMain :: GanetiDaemon -> [OptType] -> (DaemonOptions -> IO ()) -> IO () |
320 | 6ec7a50e | Iustin Pop | genericMain daemon options main = do |
321 | 6ec7a50e | Iustin Pop | let progname = daemonName daemon |
322 | 6ec7a50e | Iustin Pop | (opts, args) <- parseArgs progname options |
323 | 6ec7a50e | Iustin Pop | |
324 | 6ec7a50e | Iustin Pop | when (optShowHelp opts) $ do |
325 | 6ec7a50e | Iustin Pop | putStr $ usageHelp progname options |
326 | 2cdaf225 | Iustin Pop | exitSuccess |
327 | 6ec7a50e | Iustin Pop | when (optShowVer opts) $ do |
328 | 6ec7a50e | Iustin Pop | printf "%s %s\ncompiled with %s %s\nrunning on %s %s\n" |
329 | 6ec7a50e | Iustin Pop | progname Version.version |
330 | 6ec7a50e | Iustin Pop | compilerName (Data.Version.showVersion compilerVersion) |
331 | 6ec7a50e | Iustin Pop | os arch :: IO () |
332 | 2cdaf225 | Iustin Pop | exitSuccess |
333 | 88a10df5 | Iustin Pop | |
334 | 88a10df5 | Iustin Pop | exitUnless (null args) "This program doesn't take any arguments" |
335 | 6ec7a50e | Iustin Pop | |
336 | 6ec7a50e | Iustin Pop | unless (optNoUserChecks opts) $ do |
337 | 6ec7a50e | Iustin Pop | runtimeEnts <- getEnts |
338 | 88a10df5 | Iustin Pop | ents <- exitIfBad "Can't find required user/groups" runtimeEnts |
339 | 88a10df5 | Iustin Pop | verifyDaemonUser daemon ents |
340 | 6ec7a50e | Iustin Pop | |
341 | b714ff89 | Iustin Pop | syslog <- case optSyslogUsage opts of |
342 | 88a10df5 | Iustin Pop | Nothing -> exitIfBad "Invalid cluster syslog setting" $ |
343 | b714ff89 | Iustin Pop | syslogUsageFromRaw C.syslogUsage |
344 | b714ff89 | Iustin Pop | Just v -> return v |
345 | 0c28bee1 | Iustin Pop | let processFn = if optDaemonize opts |
346 | 0c28bee1 | Iustin Pop | then daemonize (daemonLogFile daemon) |
347 | 0c28bee1 | Iustin Pop | else id |
348 | b714ff89 | Iustin Pop | processFn $ innerMain daemon opts syslog (main opts) |
349 | 6ec7a50e | Iustin Pop | |
350 | 6ec7a50e | Iustin Pop | -- | Inner daemon function. |
351 | 6ec7a50e | Iustin Pop | -- |
352 | 6ec7a50e | Iustin Pop | -- This is executed after daemonization. |
353 | b714ff89 | Iustin Pop | innerMain :: GanetiDaemon -> DaemonOptions -> SyslogUsage -> IO () -> IO () |
354 | b714ff89 | Iustin Pop | innerMain daemon opts syslog main = do |
355 | 0c28bee1 | Iustin Pop | let logfile = if optDaemonize opts |
356 | 0c28bee1 | Iustin Pop | then Nothing |
357 | 0c28bee1 | Iustin Pop | else Just $ daemonLogFile daemon |
358 | 0c28bee1 | Iustin Pop | setupLogging logfile (daemonName daemon) (optDebug opts) True False syslog |
359 | 6ec7a50e | Iustin Pop | pid_fd <- writePidFile (daemonPidFile daemon) |
360 | 88a10df5 | Iustin Pop | _ <- exitIfBad "Cannot write PID file; already locked? Error" pid_fd |
361 | 6ec7a50e | Iustin Pop | logNotice "starting" |
362 | 6ec7a50e | Iustin Pop | main |