275 lines
7.7 KiB
Haskell
275 lines
7.7 KiB
Haskell
module Propellor.CmdLine where
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import System.Environment
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import Data.List
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import System.Exit
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import Propellor
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import Utility.FileMode
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import Utility.SafeCommand
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data CmdLine
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= Run HostName
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| Spin HostName
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| Boot HostName
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| Set HostName PrivDataField
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| AddKey String
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| Continue CmdLine
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deriving (Read, Show, Eq)
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usage :: IO a
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usage = do
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putStrLn $ unlines
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[ "Usage:"
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, " propellor"
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, " propellor hostname"
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, " propellor --spin hostname"
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, " propellor --set hostname field"
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, " propellor --add-key keyid"
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]
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exitFailure
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processCmdLine :: IO CmdLine
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processCmdLine = go =<< getArgs
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where
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go ("--help":_) = usage
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go ("--spin":h:[]) = return $ Spin h
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go ("--boot":h:[]) = return $ Boot h
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go ("--add-key":k:[]) = return $ AddKey k
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go ("--set":h:f:[]) = case readish f of
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Just pf -> return $ Set h pf
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Nothing -> error $ "Unknown privdata field " ++ f
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go ("--continue":s:[]) =case readish s of
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Just cmdline -> return $ Continue cmdline
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Nothing -> error "--continue serialization failure"
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go (h:[]) = return $ Run h
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go [] = do
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s <- takeWhile (/= '\n') <$> readProcess "hostname" ["-f"]
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if null s
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then error "Cannot determine hostname! Pass it on the command line."
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else return $ Run s
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go _ = usage
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defaultMain :: (HostName -> Maybe [Property]) -> IO ()
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defaultMain getprops = go True =<< processCmdLine
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where
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go _ (Continue cmdline) = go False cmdline
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go _ (Set host field) = setPrivData host field
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go _ (AddKey keyid) = addKey keyid
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go _ (Spin host) = withprops host $ const $ spin host
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go True cmdline = pullFirst cmdline $ go False cmdline
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go _ (Run host) = withprops host $ ensureProperties
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go _ (Boot host) = withprops host $ boot
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withprops host a = maybe (unknownhost host) a (getprops host)
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unknownhost :: HostName -> IO a
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unknownhost h = error $ unwords
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[ "Unknown host:", h
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, "(perhaps you should specify the real hostname on the command line?)"
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]
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pullFirst :: CmdLine -> IO () -> IO ()
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pullFirst cmdline next = do
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branchref <- takeWhile (/= '\n')
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<$> readProcess "git" ["symbolic-ref", "HEAD"]
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let originbranch = "origin" </> takeFileName branchref
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void $ boolSystem "git" [Param "fetch"]
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whenM (doesFileExist keyring) $ do
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{- To verify origin/master commit's signature, have to
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- convince gpg to use our keyring. While running git log.
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- Which has no way to pass options to gpg.
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- Argh! -}
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let gpgconf = privDataDir </> "gpg.conf"
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writeFile gpgconf $ unlines
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[ " keyring " ++ keyring
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, "no-auto-check-trustdb"
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]
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-- gpg is picky about perms
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modifyFileMode privDataDir (removeModes otherGroupModes)
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s <- readProcessEnv "git" ["log", "-n", "1", "--format=%G?", originbranch]
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(Just [("GNUPGHOME", privDataDir)])
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nukeFile $ privDataDir </> "trustring.gpg"
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nukeFile $ privDataDir </> "gpg.conf"
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if s == "U\n" || s == "G\n"
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then putStrLn $ "git branch " ++ originbranch ++ " gpg signature verified; merging"
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else error $ "git branch " ++ originbranch ++ " is not signed with a trusted gpg key; refusing to deploy it!"
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oldsha <- getCurrentGitSha1 branchref
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void $ boolSystem "git" [Param "merge", Param originbranch]
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newsha <- getCurrentGitSha1 branchref
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if oldsha == newsha
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then next
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else do
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ifM (boolSystem "make" [Param "build"])
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( void $ boolSystem "./propellor" [Param "--continue", Param (show cmdline)]
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, error "Propellor build failed!"
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)
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getCurrentGitSha1 :: String -> IO String
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getCurrentGitSha1 branchref = readProcess "git" ["show-ref", "--hash", branchref]
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spin :: HostName -> IO ()
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spin host = do
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url <- getUrl
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void $ gitCommit [Param "--allow-empty", Param "-a", Param "-m", Param "propellor spin"]
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void $ boolSystem "git" [Param "push"]
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go url =<< gpgDecrypt (privDataFile host)
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where
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go url privdata = withBothHandles createProcessSuccess (proc "ssh" [user, bootstrapcmd]) $ \(toh, fromh) -> do
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let finish = do
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senddata toh (privDataFile host) privDataMarker privdata
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hClose toh
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-- Display remaining output.
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void $ tryIO $ forever $
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showremote =<< hGetLine fromh
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hClose fromh
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status <- getstatus fromh `catchIO` error "protocol error"
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case status of
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Ready -> finish
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NeedGitClone -> do
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hClose toh
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hClose fromh
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sendGitClone host url
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go url privdata
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user = "root@"++host
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bootstrapcmd = shellWrap $ intercalate " && "
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[ intercalate " ; "
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[ "if [ ! -d " ++ localdir ++ " ]"
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, "then " ++ intercalate " && "
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[ "apt-get -y install git"
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, "echo " ++ toMarked statusMarker (show NeedGitClone)
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]
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, "fi"
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]
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, "cd " ++ localdir
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, "make build"
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, "./propellor --boot " ++ host
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]
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getstatus :: Handle -> IO BootStrapStatus
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getstatus h = do
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l <- hGetLine h
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case readish =<< fromMarked statusMarker l of
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Nothing -> do
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showremote l
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getstatus h
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Just status -> return status
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showremote s = putStrLn s
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senddata toh f marker s = do
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putStr $ "Sending " ++ f ++ " (" ++ show (length s) ++ " bytes) to " ++ host ++ "..."
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hFlush stdout
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hPutStrLn toh $ toMarked marker s
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hFlush toh
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putStrLn "done"
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sendGitClone :: HostName -> String -> IO ()
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sendGitClone host url = do
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putStrLn $ "Pushing git repository to " ++ host
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withTmpFile "gitbundle" $ \tmp _ -> do
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-- TODO: ssh connection caching, or better push method
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-- with less connections.
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void $ boolSystem "git" [Param "bundle", Param "create", File tmp, Param "HEAD"]
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void $ boolSystem "scp" [File tmp, Param ("root@"++host++":"++remotebundle)]
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void $ boolSystem "ssh" [Param ("root@"++host), Param unpackcmd]
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where
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remotebundle = "/usr/local/propellor.git"
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unpackcmd = shellWrap $ intercalate " && "
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[ "git clone " ++ remotebundle ++ " " ++ localdir
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, "cd " ++ localdir
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, "git checkout -b master"
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, "git remote rm origin"
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, "git remote add origin " ++ url
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, "rm -f " ++ remotebundle
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]
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data BootStrapStatus = Ready | NeedGitClone
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deriving (Read, Show, Eq)
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type Marker = String
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type Marked = String
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statusMarker :: Marker
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statusMarker = "STATUS"
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privDataMarker :: String
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privDataMarker = "PRIVDATA "
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toMarked :: Marker -> String -> String
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toMarked marker = intercalate "\n" . map (marker ++) . lines
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fromMarked :: Marker -> Marked -> Maybe String
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fromMarked marker s
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| null matches = Nothing
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| otherwise = Just $ intercalate "\n" $
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map (drop len) matches
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where
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len = length marker
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matches = filter (marker `isPrefixOf`) $ lines s
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boot :: [Property] -> IO ()
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boot props = do
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putStrLn $ toMarked statusMarker $ show Ready
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hFlush stdout
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reply <- hGetContentsStrict stdin
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makePrivDataDir
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maybe noop (writeFileProtected privDataLocal) $
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fromMarked privDataMarker reply
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ensureProperties props
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addKey :: String -> IO ()
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addKey keyid = exitBool =<< allM id [ gpg, gitadd, gitcommit ]
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where
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gpg = boolSystem "sh"
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[ Param "-c"
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, Param $ "gpg --export " ++ keyid ++ " | gpg " ++
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unwords (gpgopts ++ ["--import"])
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]
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gitadd = boolSystem "git"
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[ Param "add"
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, File keyring
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]
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gitcommit = gitCommit
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[ File keyring
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, Param "-m"
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, Param "propellor addkey"
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]
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{- Automatically sign the commit if there'a a keyring. -}
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gitCommit :: [CommandParam] -> IO Bool
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gitCommit ps = do
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k <- doesFileExist keyring
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boolSystem "git" $ catMaybes $
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[ Just (Param "commit")
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, if k then Just (Param "--gpg-sign") else Nothing
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] ++ map Just ps
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keyring :: FilePath
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keyring = privDataDir </> "keyring.gpg"
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gpgopts :: [String]
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gpgopts = ["--options", "/dev/null", "--no-default-keyring", "--keyring", keyring]
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localdir :: FilePath
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localdir = "/usr/local/propellor"
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getUrl :: IO String
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getUrl = fromMaybe nourl <$> getM get urls
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where
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urls = ["remote.deploy.url", "remote.origin.url"]
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nourl = error $ "Cannot find deploy url in " ++ show urls
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get u = do
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v <- catchMaybeIO $
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takeWhile (/= '\n')
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<$> readProcess "git" ["config", u]
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return $ case v of
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Just url | not (null url) -> Just url
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_ -> Nothing
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