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{- git-annex command
-
- Copyright 2024 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# LANGUAGE OverloadedStrings #-}
module Command.Sim where
import Command
import Annex.Sim
import Annex.Sim.File
import Annex.Perms
import System.Random
cmd :: Command
cmd = command "sim" SectionTesting
"simulate a network of repositories"
paramCommand (withParams seek)
seek :: CmdParams -> CommandSeek
seek ("start":[]) = startsim Nothing
seek ("start":simfile:[]) = startsim (Just simfile)
seek ("end":[]) = endsim
seek ("show":[]) = do
simdir <- fromRepo gitAnnexSimDir
liftIO (restoreSim simdir) >>= \case
Left err -> giveup err
Right st -> showsim st
seek ("run":simfile:[]) = startsim' (Just simfile) >>= cleanup
where
cleanup st = do
st' <- liftIO $ quiesceSim st
endsim
when (simFailed st') $ do
showsim st'
giveup "Simulation shown above had errors."
seek ps = case parseSimCommand ps of
Left err -> giveup err
Right simcmd -> do
repobyname <- mkGetExistingRepoByName
simdir <- fromRepo gitAnnexSimDir
liftIO (restoreSim simdir) >>= \case
Left err -> giveup err
Right st -> do
st' <- runSimCommand simcmd repobyname st
liftIO $ suspendSim st'
when (simFailed st' && not (simFailed st)) $
giveup "Simulation had errors."
startsim :: Maybe FilePath -> CommandSeek
startsim simfile = startsim' simfile >>= cleanup
where
cleanup st = do
liftIO $ suspendSim st
when (simFailed st) $
giveup "Simulation had errors."
startsim' :: Maybe FilePath -> Annex (SimState SimRepo)
startsim' simfile = do
simdir <- fromRepo gitAnnexSimDir
whenM (liftIO $ doesDirectoryExist simdir) $
giveup "A sim was previously started. Use `git-annex sim end` to stop it before starting a new one."
showLongNote $ UnquotedString "Sim started."
rng <- liftIO $ fst . random <$> getStdGen
let st = emptySimState rng (fromOsPath simdir)
case simfile of
Nothing -> startup simdir st []
Just f -> liftIO (readFile f) >>= \c ->
case parseSimFile c of
Left err -> giveup err
Right cs -> startup simdir st cs
where
startup simdir st cs = do
repobyname <- mkGetExistingRepoByName
createAnnexDirectory simdir
let st' = recordSeed st cs
go st' repobyname cs
go st _ [] = return st
go st repobyname (c:cs) = do
st' <- runSimCommand c repobyname st
go st' repobyname cs
endsim :: CommandSeek
endsim = do
simdir <- fromRepo gitAnnexSimDir
whenM (liftIO $ doesDirectoryExist simdir) $ do
liftIO $ removeDirectoryRecursive simdir
showLongNote $ UnquotedString "Sim ended."
showsim :: SimState SimRepo -> Annex ()
showsim = liftIO . putStr . generateSimFile . reverse . simHistory
|
