root / src / Ganeti / Runtime.hs @ 3a9fe2bc
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1 | 7946c25d | Iustin Pop | {-| Implementation of the runtime configuration details. |
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2 | 7946c25d | Iustin Pop | |
3 | 7946c25d | Iustin Pop | -} |
4 | 7946c25d | Iustin Pop | |
5 | 7946c25d | Iustin Pop | {- |
6 | 7946c25d | Iustin Pop | |
7 | 9411474b | Iustin Pop | Copyright (C) 2011, 2012, 2013 Google Inc. |
8 | 7946c25d | Iustin Pop | |
9 | 7946c25d | Iustin Pop | This program is free software; you can redistribute it and/or modify |
10 | 7946c25d | Iustin Pop | it under the terms of the GNU General Public License as published by |
11 | 7946c25d | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
12 | 7946c25d | Iustin Pop | (at your option) any later version. |
13 | 7946c25d | Iustin Pop | |
14 | 7946c25d | Iustin Pop | This program is distributed in the hope that it will be useful, but |
15 | 7946c25d | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | 7946c25d | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | 7946c25d | Iustin Pop | General Public License for more details. |
18 | 7946c25d | Iustin Pop | |
19 | 7946c25d | Iustin Pop | You should have received a copy of the GNU General Public License |
20 | 7946c25d | Iustin Pop | along with this program; if not, write to the Free Software |
21 | 7946c25d | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 | 7946c25d | Iustin Pop | 02110-1301, USA. |
23 | 7946c25d | Iustin Pop | |
24 | 7946c25d | Iustin Pop | -} |
25 | 7946c25d | Iustin Pop | |
26 | 7946c25d | Iustin Pop | module Ganeti.Runtime |
27 | 7946c25d | Iustin Pop | ( GanetiDaemon(..) |
28 | 7946c25d | Iustin Pop | , MiscGroup(..) |
29 | 7946c25d | Iustin Pop | , GanetiGroup(..) |
30 | 7946c25d | Iustin Pop | , RuntimeEnts |
31 | 7946c25d | Iustin Pop | , daemonName |
32 | 670e954a | Thomas Thrainer | , daemonOnlyOnMaster |
33 | 7946c25d | Iustin Pop | , daemonUser |
34 | 7946c25d | Iustin Pop | , daemonGroup |
35 | 7946c25d | Iustin Pop | , daemonLogFile |
36 | 7946c25d | Iustin Pop | , daemonPidFile |
37 | 7946c25d | Iustin Pop | , getEnts |
38 | 7946c25d | Iustin Pop | , verifyDaemonUser |
39 | 7946c25d | Iustin Pop | ) where |
40 | 7946c25d | Iustin Pop | |
41 | 7946c25d | Iustin Pop | import Control.Exception |
42 | 7946c25d | Iustin Pop | import Control.Monad |
43 | 7946c25d | Iustin Pop | import qualified Data.Map as M |
44 | 7946c25d | Iustin Pop | import System.Exit |
45 | 7946c25d | Iustin Pop | import System.FilePath |
46 | 7946c25d | Iustin Pop | import System.IO |
47 | 7946c25d | Iustin Pop | import System.IO.Error |
48 | 7946c25d | Iustin Pop | import System.Posix.Types |
49 | 7946c25d | Iustin Pop | import System.Posix.User |
50 | 7946c25d | Iustin Pop | import Text.Printf |
51 | 7946c25d | Iustin Pop | |
52 | 7946c25d | Iustin Pop | import qualified Ganeti.Constants as C |
53 | 9eeb0aa5 | Michael Hanselmann | import qualified Ganeti.Path as Path |
54 | 7946c25d | Iustin Pop | import Ganeti.BasicTypes |
55 | 7946c25d | Iustin Pop | |
56 | 7946c25d | Iustin Pop | data GanetiDaemon = GanetiMasterd |
57 | 7946c25d | Iustin Pop | | GanetiNoded |
58 | 7946c25d | Iustin Pop | | GanetiRapi |
59 | 7946c25d | Iustin Pop | | GanetiConfd |
60 | 3695a4e0 | Thomas Thrainer | | GanetiLuxid |
61 | f511082f | Michele Tartara | | GanetiMond |
62 | 7946c25d | Iustin Pop | deriving (Show, Enum, Bounded, Eq, Ord) |
63 | 7946c25d | Iustin Pop | |
64 | 7946c25d | Iustin Pop | data MiscGroup = DaemonsGroup |
65 | 7946c25d | Iustin Pop | | AdminGroup |
66 | 7946c25d | Iustin Pop | deriving (Show, Enum, Bounded, Eq, Ord) |
67 | 7946c25d | Iustin Pop | |
68 | 7946c25d | Iustin Pop | data GanetiGroup = DaemonGroup GanetiDaemon |
69 | 7946c25d | Iustin Pop | | ExtraGroup MiscGroup |
70 | 7946c25d | Iustin Pop | deriving (Show, Eq, Ord) |
71 | 7946c25d | Iustin Pop | |
72 | 7946c25d | Iustin Pop | type RuntimeEnts = (M.Map GanetiDaemon UserID, M.Map GanetiGroup GroupID) |
73 | 7946c25d | Iustin Pop | |
74 | 7946c25d | Iustin Pop | -- | Returns the daemon name for a given daemon. |
75 | 7946c25d | Iustin Pop | daemonName :: GanetiDaemon -> String |
76 | 7946c25d | Iustin Pop | daemonName GanetiMasterd = C.masterd |
77 | 7946c25d | Iustin Pop | daemonName GanetiNoded = C.noded |
78 | 7946c25d | Iustin Pop | daemonName GanetiRapi = C.rapi |
79 | 7946c25d | Iustin Pop | daemonName GanetiConfd = C.confd |
80 | 3695a4e0 | Thomas Thrainer | daemonName GanetiLuxid = C.luxid |
81 | f511082f | Michele Tartara | daemonName GanetiMond = C.mond |
82 | 7946c25d | Iustin Pop | |
83 | 670e954a | Thomas Thrainer | -- | Returns whether the daemon only runs on the master node. |
84 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster :: GanetiDaemon -> Bool |
85 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster GanetiMasterd = True |
86 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster GanetiNoded = False |
87 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster GanetiRapi = False |
88 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster GanetiConfd = False |
89 | 3695a4e0 | Thomas Thrainer | daemonOnlyOnMaster GanetiLuxid = True |
90 | 670e954a | Thomas Thrainer | daemonOnlyOnMaster GanetiMond = False |
91 | 670e954a | Thomas Thrainer | |
92 | 9411474b | Iustin Pop | -- | Returns the log file base for a daemon. |
93 | 9411474b | Iustin Pop | daemonLogBase :: GanetiDaemon -> String |
94 | 9411474b | Iustin Pop | daemonLogBase GanetiMasterd = C.daemonsLogbaseGanetiMasterd |
95 | 9411474b | Iustin Pop | daemonLogBase GanetiNoded = C.daemonsLogbaseGanetiNoded |
96 | 9411474b | Iustin Pop | daemonLogBase GanetiRapi = C.daemonsLogbaseGanetiRapi |
97 | 9411474b | Iustin Pop | daemonLogBase GanetiConfd = C.daemonsLogbaseGanetiConfd |
98 | 3695a4e0 | Thomas Thrainer | daemonLogBase GanetiLuxid = C.daemonsLogbaseGanetiLuxid |
99 | f511082f | Michele Tartara | daemonLogBase GanetiMond = C.daemonsLogbaseGanetiMond |
100 | 9411474b | Iustin Pop | |
101 | 7946c25d | Iustin Pop | -- | Returns the configured user name for a daemon. |
102 | 7946c25d | Iustin Pop | daemonUser :: GanetiDaemon -> String |
103 | 7946c25d | Iustin Pop | daemonUser GanetiMasterd = C.masterdUser |
104 | 7946c25d | Iustin Pop | daemonUser GanetiNoded = C.nodedUser |
105 | 7946c25d | Iustin Pop | daemonUser GanetiRapi = C.rapiUser |
106 | 7946c25d | Iustin Pop | daemonUser GanetiConfd = C.confdUser |
107 | 3695a4e0 | Thomas Thrainer | daemonUser GanetiLuxid = C.luxidUser |
108 | f511082f | Michele Tartara | daemonUser GanetiMond = C.mondUser |
109 | 7946c25d | Iustin Pop | |
110 | 7946c25d | Iustin Pop | -- | Returns the configured group for a daemon. |
111 | 7946c25d | Iustin Pop | daemonGroup :: GanetiGroup -> String |
112 | 7946c25d | Iustin Pop | daemonGroup (DaemonGroup GanetiMasterd) = C.masterdGroup |
113 | 7946c25d | Iustin Pop | daemonGroup (DaemonGroup GanetiNoded) = C.nodedGroup |
114 | 7946c25d | Iustin Pop | daemonGroup (DaemonGroup GanetiRapi) = C.rapiGroup |
115 | 7946c25d | Iustin Pop | daemonGroup (DaemonGroup GanetiConfd) = C.confdGroup |
116 | 3695a4e0 | Thomas Thrainer | daemonGroup (DaemonGroup GanetiLuxid) = C.luxidGroup |
117 | f511082f | Michele Tartara | daemonGroup (DaemonGroup GanetiMond) = C.mondGroup |
118 | 7946c25d | Iustin Pop | daemonGroup (ExtraGroup DaemonsGroup) = C.daemonsGroup |
119 | 7946c25d | Iustin Pop | daemonGroup (ExtraGroup AdminGroup) = C.adminGroup |
120 | 7946c25d | Iustin Pop | |
121 | 7946c25d | Iustin Pop | -- | Returns the log file for a daemon. |
122 | 29a30533 | Iustin Pop | daemonLogFile :: GanetiDaemon -> IO FilePath |
123 | 29a30533 | Iustin Pop | daemonLogFile daemon = do |
124 | 29a30533 | Iustin Pop | logDir <- Path.logDir |
125 | 9411474b | Iustin Pop | return $ logDir </> daemonLogBase daemon <.> "log" |
126 | 7946c25d | Iustin Pop | |
127 | 7946c25d | Iustin Pop | -- | Returns the pid file name for a daemon. |
128 | 29a30533 | Iustin Pop | daemonPidFile :: GanetiDaemon -> IO FilePath |
129 | 29a30533 | Iustin Pop | daemonPidFile daemon = do |
130 | 29a30533 | Iustin Pop | runDir <- Path.runDir |
131 | 29a30533 | Iustin Pop | return $ runDir </> daemonName daemon <.> "pid" |
132 | 7946c25d | Iustin Pop | |
133 | 7946c25d | Iustin Pop | -- | All groups list. A bit hacking, as we can't enforce it's complete |
134 | 7946c25d | Iustin Pop | -- at compile time. |
135 | 7946c25d | Iustin Pop | allGroups :: [GanetiGroup] |
136 | 7946c25d | Iustin Pop | allGroups = map DaemonGroup [minBound..maxBound] ++ |
137 | 7946c25d | Iustin Pop | map ExtraGroup [minBound..maxBound] |
138 | 7946c25d | Iustin Pop | |
139 | 7946c25d | Iustin Pop | ignoreDoesNotExistErrors :: IO a -> IO (Result a) |
140 | 7946c25d | Iustin Pop | ignoreDoesNotExistErrors value = do |
141 | 7946c25d | Iustin Pop | result <- tryJust (\e -> if isDoesNotExistError e |
142 | 7946c25d | Iustin Pop | then Just (show e) |
143 | 7946c25d | Iustin Pop | else Nothing) value |
144 | 7946c25d | Iustin Pop | return $ eitherToResult result |
145 | 7946c25d | Iustin Pop | |
146 | 7946c25d | Iustin Pop | -- | Computes the group/user maps. |
147 | 7946c25d | Iustin Pop | getEnts :: IO (Result RuntimeEnts) |
148 | 7946c25d | Iustin Pop | getEnts = do |
149 | 7946c25d | Iustin Pop | users <- mapM (\daemon -> do |
150 | 7946c25d | Iustin Pop | entry <- ignoreDoesNotExistErrors . |
151 | 7946c25d | Iustin Pop | getUserEntryForName . |
152 | 7946c25d | Iustin Pop | daemonUser $ daemon |
153 | 7946c25d | Iustin Pop | return (entry >>= \e -> return (daemon, userID e)) |
154 | 7946c25d | Iustin Pop | ) [minBound..maxBound] |
155 | 7946c25d | Iustin Pop | groups <- mapM (\group -> do |
156 | 7946c25d | Iustin Pop | entry <- ignoreDoesNotExistErrors . |
157 | 7946c25d | Iustin Pop | getGroupEntryForName . |
158 | 7946c25d | Iustin Pop | daemonGroup $ group |
159 | 7946c25d | Iustin Pop | return (entry >>= \e -> return (group, groupID e)) |
160 | 7946c25d | Iustin Pop | ) allGroups |
161 | 7946c25d | Iustin Pop | return $ do -- 'Result' monad |
162 | 7946c25d | Iustin Pop | users' <- sequence users |
163 | 7946c25d | Iustin Pop | groups' <- sequence groups |
164 | 7946c25d | Iustin Pop | let usermap = M.fromList users' |
165 | 7946c25d | Iustin Pop | groupmap = M.fromList groups' |
166 | 7946c25d | Iustin Pop | return (usermap, groupmap) |
167 | 7946c25d | Iustin Pop | |
168 | 7946c25d | Iustin Pop | |
169 | 7946c25d | Iustin Pop | -- | Checks whether a daemon runs as the right user. |
170 | 7946c25d | Iustin Pop | verifyDaemonUser :: GanetiDaemon -> RuntimeEnts -> IO () |
171 | 7946c25d | Iustin Pop | verifyDaemonUser daemon ents = do |
172 | 7946c25d | Iustin Pop | myuid <- getEffectiveUserID |
173 | 7946c25d | Iustin Pop | -- note: we use directly ! as lookup failues shouldn't happen, due |
174 | 7946c25d | Iustin Pop | -- to the above map construction |
175 | 7946c25d | Iustin Pop | checkUidMatch (daemonName daemon) ((M.!) (fst ents) daemon) myuid |
176 | 7946c25d | Iustin Pop | |
177 | 7946c25d | Iustin Pop | -- | Check that two UIDs are matching or otherwise exit. |
178 | 7946c25d | Iustin Pop | checkUidMatch :: String -> UserID -> UserID -> IO () |
179 | 7946c25d | Iustin Pop | checkUidMatch name expected actual = |
180 | 7946c25d | Iustin Pop | when (expected /= actual) $ do |
181 | 7946c25d | Iustin Pop | hPrintf stderr "%s started using wrong user ID (%d), \ |
182 | 7946c25d | Iustin Pop | \expected %d\n" name |
183 | 7946c25d | Iustin Pop | (fromIntegral actual::Int) |
184 | 7946c25d | Iustin Pop | (fromIntegral expected::Int) :: IO () |
185 | 7946c25d | Iustin Pop | exitWith $ ExitFailure C.exitFailure |