Commit a39cd547 authored by Michele Tartara's avatar Michele Tartara

Add hs function to easily change file ownership

The Haskell library functions only allow to change file ownership using
uid/gid. A function for doing that with explicit names is added by this
commit.
Signed-off-by: default avatarMichele Tartara <mtartara@google.com>
Reviewed-by: default avatarIustin Pop <iustin@google.com>
parent 3695a4e0
......@@ -56,19 +56,23 @@ module Ganeti.Utils
, exitIfEmpty
, splitEithers
, recombineEithers
, setOwnerAndGroupFromNames
) where
import Data.Char (toUpper, isAlphaNum, isDigit, isSpace)
import Data.Function (on)
import Data.List
import qualified Data.Map as M
import Control.Monad (foldM)
import Debug.Trace
import Ganeti.BasicTypes
import qualified Ganeti.Constants as C
import Ganeti.Runtime
import System.IO
import System.Exit
import System.Posix.Files
import System.Time
-- * Debug functions
......@@ -431,3 +435,16 @@ recombineEithers lefts rights trail =
recombiner (_, ls, rs) t = Bad $ "Inconsistent trail log: l=" ++
show ls ++ ", r=" ++ show rs ++ ",t=" ++
show t
-- | Set the owner and the group of a file (given as names, not numeric id).
setOwnerAndGroupFromNames :: FilePath -> GanetiDaemon -> GanetiGroup -> IO ()
setOwnerAndGroupFromNames filename daemon dGroup = do
-- TODO: it would be nice to rework this (or getEnts) so that runtimeEnts
-- is read only once per daemon startup, and then cached for further usage.
runtimeEnts <- getEnts
ents <- exitIfBad "Can't find required user/groups" runtimeEnts
-- note: we use directly ! as lookup failures shouldn't happen, due
-- to the map construction
let uid = fst ents M.! daemon
let gid = snd ents M.! dGroup
setOwnerAndGroup filename uid gid
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