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git-annex/Remote/Git.hs
Joey Hess cfd0b4108e
avoid windows build warning
2019-08-13 13:10:33 -04:00

864 lines
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{- Standard git remotes.
-
- Copyright 2011-2019 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Remote.Git (
remote,
configRead,
repoAvail,
onLocal,
) where
import Annex.Common
import Annex.Ssh
import Types.Remote
import Types.GitConfig
import qualified Git
import qualified Git.Config
import qualified Git.Construct
import qualified Git.Command
import qualified Git.GCrypt
import qualified Git.Types as Git
import qualified Annex
import Logs.Presence
import Annex.Transfer
import Annex.UUID
import qualified Annex.Content
import qualified Annex.BranchState
import qualified Annex.Branch
import qualified Annex.Url as Url
import Utility.Tmp
import Config
import Config.Cost
import Config.DynamicConfig
import Annex.Init
import Annex.Version
import Types.CleanupActions
import qualified CmdLine.GitAnnexShell.Fields as Fields
import Logs.Location
import Utility.Metered
import Utility.CopyFile
import Utility.FileMode
import Utility.Env
import Utility.Batch
import Utility.SimpleProtocol
import Remote.Helper.Git
import Remote.Helper.Messages
import Remote.Helper.ExportImport
import qualified Remote.Helper.Ssh as Ssh
import qualified Remote.GCrypt
import qualified Remote.GitLFS
import qualified Remote.P2P
import qualified Remote.Helper.P2P as P2PHelper
import P2P.Address
import Annex.Path
import Creds
import Types.NumCopies
import Annex.Action
import Messages.Progress
import Control.Concurrent
import Control.Concurrent.MSampleVar
import qualified Data.Map as M
import Network.URI
remote :: RemoteType
remote = RemoteType
{ typename = "git"
, enumerate = list
, generate = gen
, setup = gitSetup
, exportSupported = exportUnsupported
, importSupported = importUnsupported
}
list :: Bool -> Annex [Git.Repo]
list autoinit = do
c <- fromRepo Git.config
rs <- mapM (tweakurl c) =<< Annex.getGitRemotes
mapM (configRead autoinit) rs
where
annexurl n = "remote." ++ n ++ ".annexurl"
tweakurl c r = do
let n = fromJust $ Git.remoteName r
case M.lookup (annexurl n) c of
Nothing -> return r
Just url -> inRepo $ \g ->
Git.Construct.remoteNamed n $
Git.Construct.fromRemoteLocation url g
{- Git remotes are normally set up using standard git command, not
- git-annex initremote and enableremote.
-
- For initremote, the git remote must already be set up, and have a uuid.
- Initremote simply remembers its location.
-
- enableremote simply sets up a git remote using the stored location.
- No attempt is made to make the remote be accessible via ssh key setup,
- etc.
-}
gitSetup :: SetupStage -> Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> Annex (RemoteConfig, UUID)
gitSetup Init mu _ c _ = do
let location = fromMaybe (giveup "Specify location=url") $
Url.parseURIRelaxed =<< M.lookup "location" c
rs <- Annex.getGitRemotes
u <- case filter (\r -> Git.location r == Git.Url location) rs of
[r] -> getRepoUUID r
[] -> giveup "could not find existing git remote with specified location"
_ -> giveup "found multiple git remotes with specified location"
if isNothing mu || mu == Just u
then return (c, u)
else error "git remote did not have specified uuid"
gitSetup (Enable _) (Just u) _ c _ = do
inRepo $ Git.Command.run
[ Param "remote"
, Param "add"
, Param $ fromMaybe (giveup "no name") (M.lookup "name" c)
, Param $ fromMaybe (giveup "no location") (M.lookup "location" c)
]
return (c, u)
gitSetup (Enable _) Nothing _ _ _ = error "unable to enable git remote with no specified uuid"
{- It's assumed to be cheap to read the config of non-URL remotes, so this is
- done each time git-annex is run in a way that uses remotes, unless
- annex-checkuuid is false.
-
- Conversely, the config of an URL remote is only read when there is no
- cached UUID value. -}
configRead :: Bool -> Git.Repo -> Annex Git.Repo
configRead autoinit r = do
gc <- Annex.getRemoteGitConfig r
u <- getRepoUUID r
annexignore <- liftIO $ getDynamicConfig (remoteAnnexIgnore gc)
case (repoCheap r, annexignore, u) of
(_, True, _) -> return r
(True, _, _)
| remoteAnnexCheckUUID gc -> tryGitConfigRead autoinit r
| otherwise -> return r
(False, _, NoUUID) -> tryGitConfigRead autoinit r
_ -> return r
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc
-- Remote.GitLFS may be used with a repo that is also encrypted
-- with gcrypt so is checked first.
| remoteAnnexGitLFS gc = Remote.GitLFS.gen r u c gc
| Git.GCrypt.isEncrypted r = Remote.GCrypt.chainGen r u c gc
| otherwise = case repoP2PAddress r of
Nothing -> do
st <- mkState r u gc
go st <$> remoteCost gc defcst
Just addr -> Remote.P2P.chainGen addr r u c gc
where
defcst = if repoCheap r then cheapRemoteCost else expensiveRemoteCost
go st cst = Just new
where
new = Remote
{ uuid = u
, cost = cst
, name = Git.repoDescribe r
, storeKey = copyToRemote new st
, retrieveKeyFile = copyFromRemote new st
, retrieveKeyFileCheap = copyFromRemoteCheap new st
, retrievalSecurityPolicy = RetrievalAllKeysSecure
, removeKey = dropKey new st
, lockContent = Just (lockKey new st)
, checkPresent = inAnnex new st
, checkPresentCheap = repoCheap r
, exportActions = exportUnsupported
, importActions = importUnsupported
, whereisKey = Nothing
, remoteFsck = if Git.repoIsUrl r
then Nothing
else Just $ fsckOnRemote r
, repairRepo = if Git.repoIsUrl r
then Nothing
else Just $ repairRemote r
, config = c
, localpath = localpathCalc r
, getRepo = getRepoFromState st
, gitconfig = gc
, readonly = Git.repoIsHttp r
, appendonly = False
, availability = availabilityCalc r
, remotetype = remote
, mkUnavailable = unavailable r u c gc
, getInfo = gitRepoInfo new
, claimUrl = Nothing
, checkUrl = Nothing
}
unavailable :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
unavailable r u c gc = gen r' u c gc
where
r' = case Git.location r of
Git.Local { Git.gitdir = d } ->
r { Git.location = Git.LocalUnknown d }
Git.Url url -> case uriAuthority url of
Just auth ->
let auth' = auth { uriRegName = "!dne!" }
in r { Git.location = Git.Url (url { uriAuthority = Just auth' })}
Nothing -> r { Git.location = Git.Unknown }
_ -> r -- already unavailable
{- Checks relatively inexpensively if a repository is available for use. -}
repoAvail :: Git.Repo -> Annex Bool
repoAvail r
| Git.repoIsHttp r = return True
| Git.GCrypt.isEncrypted r = do
g <- gitRepo
liftIO $ do
er <- Git.GCrypt.encryptedRemote g r
if Git.repoIsLocal er || Git.repoIsLocalUnknown er
then catchBoolIO $
void (Git.Config.read er) >> return True
else return True
| Git.repoIsUrl r = return True
| Git.repoIsLocalUnknown r = return False
| otherwise = liftIO $ isJust <$> catchMaybeIO (Git.Config.read r)
{- Tries to read the config for a specified remote, updates state, and
- returns the updated repo. -}
tryGitConfigRead :: Bool -> Git.Repo -> Annex Git.Repo
tryGitConfigRead autoinit r
| haveconfig r = return r -- already read
| Git.repoIsSsh r = store $ do
v <- Ssh.onRemote NoConsumeStdin r
(pipedconfig, return (Left $ giveup "configlist failed"))
"configlist" [] configlistfields
case v of
Right r'
| haveconfig r' -> return r'
| otherwise -> configlist_failed
Left _ -> configlist_failed
| Git.repoIsHttp r = store geturlconfig
| Git.GCrypt.isEncrypted r = handlegcrypt =<< getConfigMaybe (remoteConfig r "uuid")
| Git.repoIsUrl r = return r
| otherwise = store $ liftIO $
readlocalannexconfig `catchNonAsync` (const $ return r)
where
haveconfig = not . M.null . Git.config
pipedconfig cmd params = do
v <- Git.Config.fromPipe r cmd params
case v of
Right (r', val) -> do
unless (isUUIDConfigured r' || null val) $ do
warningIO $ "Failed to get annex.uuid configuration of repository " ++ Git.repoDescribe r
warningIO $ "Instead, got: " ++ show val
warningIO $ "This is unexpected; please check the network transport!"
return $ Right r'
Left l -> return $ Left l
geturlconfig = Url.withUrlOptions $ \uo -> do
v <- liftIO $ withTmpFile "git-annex.tmp" $ \tmpfile h -> do
hClose h
let url = Git.repoLocation r ++ "/config"
ifM (Url.downloadQuiet nullMeterUpdate url tmpfile uo)
( Just <$> pipedconfig "git" [Param "config", Param "--null", Param "--list", Param "--file", File tmpfile]
, return Nothing
)
case v of
Just (Right r') -> do
-- Cache when http remote is not bare for
-- optimisation.
unless (Git.Config.isBare r') $
setremote setRemoteBare False
return r'
_ -> do
set_ignore "not usable by git-annex" False
return r
store = observe $ \r' -> do
l <- Annex.getGitRemotes
let rs = exchange l r'
Annex.changeState $ \s -> s { Annex.gitremotes = Just rs }
exchange [] _ = []
exchange (old:ls) new
| Git.remoteName old == Git.remoteName new =
new : exchange ls new
| otherwise =
old : exchange ls new
{- Is this remote just not available, or does
- it not have git-annex-shell?
- Find out by trying to fetch from the remote. -}
configlist_failed = case Git.remoteName r of
Nothing -> return r
Just n -> do
whenM (inRepo $ Git.Command.runBool [Param "fetch", Param "--quiet", Param n]) $ do
set_ignore "does not have git-annex installed" True
return r
set_ignore msg longmessage = do
case Git.remoteName r of
Nothing -> noop
Just n -> do
warning $ "Remote " ++ n ++ " " ++ msg ++ "; setting annex-ignore"
when longmessage $
warning $ "This could be a problem with the git-annex installation on the remote. Please make sure that git-annex-shell is available in PATH when you ssh into the remote. Once you have fixed the git-annex installation, run: git annex enableremote " ++ n
setremote setRemoteIgnore True
setremote setter v = case Git.remoteName r of
Nothing -> noop
Just _ -> setter r v
handlegcrypt Nothing = return r
handlegcrypt (Just _cacheduuid) = do
-- Generate UUID from the gcrypt-id
g <- gitRepo
case Git.GCrypt.remoteRepoId g (Git.remoteName r) of
Nothing -> return r
Just v -> store $ liftIO $ setUUID r $
genUUIDInNameSpace gCryptNameSpace v
{- The local repo may not yet be initialized, so try to initialize
- it if allowed. However, if that fails, still return the read
- git config. -}
readlocalannexconfig = do
let check = do
Annex.BranchState.disableUpdate
void $ tryNonAsync $ ensureInitialized
Annex.getState Annex.repo
s <- Annex.new r
Annex.eval s $ check `finally` stopCoProcesses
configlistfields = if autoinit
then [(Fields.autoInit, "1")]
else []
{- Checks if a given remote has the content for a key in its annex. -}
inAnnex :: Remote -> State -> Key -> Annex Bool
inAnnex rmt st key = do
repo <- getRepo rmt
inAnnex' repo rmt st key
inAnnex' :: Git.Repo -> Remote -> State -> Key -> Annex Bool
inAnnex' repo rmt (State connpool duc _ _) key
| Git.repoIsHttp repo = checkhttp
| Git.repoIsUrl repo = checkremote
| otherwise = checklocal
where
checkhttp = do
showChecking repo
gc <- Annex.getGitConfig
ifM (Url.withUrlOptions $ \uo -> liftIO $
anyM (\u -> Url.checkBoth u (keySize key) uo) (keyUrls gc repo rmt key))
( return True
, giveup "not found"
)
checkremote =
let fallback = Ssh.inAnnex repo key
in P2PHelper.checkpresent (Ssh.runProto rmt connpool (cantCheck rmt) fallback) key
checklocal = ifM duc
( guardUsable repo (cantCheck repo) $
maybe (cantCheck repo) return
=<< onLocalFast repo rmt (Annex.Content.inAnnexSafe key)
, cantCheck repo
)
keyUrls :: GitConfig -> Git.Repo -> Remote -> Key -> [String]
keyUrls gc repo r key = map tourl locs'
where
tourl l = Git.repoLocation repo ++ "/" ++ l
-- If the remote is known to not be bare, try the hash locations
-- used for non-bare repos first, as an optimisation.
locs
| remoteAnnexBare remoteconfig == Just False = reverse (annexLocations gc key)
| otherwise = annexLocations gc key
#ifndef mingw32_HOST_OS
locs' = locs
#else
locs' = map (replace "\\" "/") locs
#endif
remoteconfig = gitconfig r
dropKey :: Remote -> State -> Key -> Annex Bool
dropKey r st key = do
repo <- getRepo r
catchNonAsync
(dropKey' repo r st key)
(\e -> warning (show e) >> return False)
dropKey' :: Git.Repo -> Remote -> State -> Key -> Annex Bool
dropKey' repo r (State connpool duc _ _) key
| not $ Git.repoIsUrl repo = ifM duc
( guardUsable repo (return False) $
commitOnCleanup repo r $ onLocalFast repo r $ do
ensureInitialized
whenM (Annex.Content.inAnnex key) $ do
Annex.Content.lockContentForRemoval key $ \lock -> do
Annex.Content.removeAnnex lock
logStatus key InfoMissing
Annex.Content.saveState True
return True
, return False
)
| Git.repoIsHttp repo = giveup "dropping from http remote not supported"
| otherwise = commitOnCleanup repo r $ do
let fallback = Ssh.dropKey repo key
P2PHelper.remove (Ssh.runProto r connpool (return False) fallback) key
lockKey :: Remote -> State -> Key -> (VerifiedCopy -> Annex r) -> Annex r
lockKey r st key callback = do
repo <- getRepo r
lockKey' repo r st key callback
lockKey' :: Git.Repo -> Remote -> State -> Key -> (VerifiedCopy -> Annex r) -> Annex r
lockKey' repo r (State connpool duc _ _) key callback
| not $ Git.repoIsUrl repo = ifM duc
( guardUsable repo failedlock $ do
inorigrepo <- Annex.makeRunner
-- Lock content from perspective of remote,
-- and then run the callback in the original
-- annex monad, not the remote's.
onLocalFast repo r $
Annex.Content.lockContentShared key $
liftIO . inorigrepo . callback
, failedlock
)
| Git.repoIsSsh repo = do
showLocking r
let withconn = Ssh.withP2PSshConnection r connpool fallback
P2PHelper.lock withconn Ssh.runProtoConn (uuid r) key callback
| otherwise = failedlock
where
fallback = do
Just (cmd, params) <- Ssh.git_annex_shell ConsumeStdin
repo "lockcontent"
[Param $ serializeKey key] []
(Just hin, Just hout, Nothing, p) <- liftIO $
withFile devNull WriteMode $ \nullh ->
createProcess $
(proc cmd (toCommand params))
{ std_in = CreatePipe
, std_out = CreatePipe
, std_err = UseHandle nullh
}
v <- liftIO $ tryIO $ getProtocolLine hout
let signaldone = void $ tryNonAsync $ liftIO $ mapM_ tryNonAsync
[ hPutStrLn hout ""
, hFlush hout
, hClose hin
, hClose hout
, void $ waitForProcess p
]
let checkexited = not . isJust <$> getProcessExitCode p
case v of
Left _exited -> do
showNote "lockcontent failed"
liftIO $ do
hClose hin
hClose hout
void $ waitForProcess p
failedlock
Right l
| l == Just Ssh.contentLockedMarker -> bracket_
noop
signaldone
(withVerifiedCopy LockedCopy r checkexited callback)
| otherwise -> do
showNote "lockcontent failed"
signaldone
failedlock
failedlock = giveup "can't lock content"
{- Tries to copy a key's content from a remote's annex to a file. -}
copyFromRemote :: Remote -> State -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
copyFromRemote = copyFromRemote' False
copyFromRemote' :: Bool -> Remote -> State -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
copyFromRemote' forcersync r st key file dest meterupdate = do
repo <- getRepo r
copyFromRemote'' repo forcersync r st key file dest meterupdate
copyFromRemote'' :: Git.Repo -> Bool -> Remote -> State -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
copyFromRemote'' repo forcersync r st@(State connpool _ _ _) key file dest meterupdate
| Git.repoIsHttp repo = unVerified $ do
gc <- Annex.getGitConfig
Annex.Content.downloadUrl key meterupdate (keyUrls gc repo r key) dest
| not $ Git.repoIsUrl repo = guardUsable repo (unVerified (return False)) $ do
params <- Ssh.rsyncParams r Download
u <- getUUID
hardlink <- wantHardLink
-- run copy from perspective of remote
onLocalFast repo r $ do
ensureInitialized
v <- Annex.Content.prepSendAnnex key
case v of
Nothing -> return (False, UnVerified)
Just (object, checksuccess) -> do
copier <- mkCopier hardlink st params
runTransfer (Transfer Download u key)
file stdRetry
(\p -> copier object dest (combineMeterUpdate p meterupdate) checksuccess)
| Git.repoIsSsh repo = if forcersync
then fallback meterupdate
else P2PHelper.retrieve
(\p -> Ssh.runProto r connpool (return (False, UnVerified)) (fallback p))
key file dest meterupdate
| otherwise = giveup "copying from non-ssh, non-http remote not supported"
where
fallback p = unVerified $ feedprogressback $ \p' -> do
oh <- mkOutputHandlerQuiet
Ssh.rsyncHelper oh (Just (combineMeterUpdate p' p))
=<< Ssh.rsyncParamsRemote False r Download key dest file
{- Feed local rsync's progress info back to the remote,
- by forking a feeder thread that runs
- git-annex-shell transferinfo at the same time
- git-annex-shell sendkey is running.
-
- To avoid extra password prompts, this is only done when ssh
- connection caching is supported.
- Note that it actually waits for rsync to indicate
- progress before starting transferinfo, in order
- to ensure ssh connection caching works and reuses
- the connection set up for the sendkey.
-
- Also note that older git-annex-shell does not support
- transferinfo, so stderr is dropped and failure ignored.
-}
feedprogressback a = ifM (isJust <$> sshCacheDir)
( feedprogressback' a
, a $ const noop
)
feedprogressback' a = do
u <- getUUID
let AssociatedFile afile = file
let fields = (Fields.remoteUUID, fromUUID u)
: maybe [] (\f -> [(Fields.associatedFile, f)]) afile
Just (cmd, params) <- Ssh.git_annex_shell ConsumeStdin
repo "transferinfo"
[Param $ serializeKey key] fields
v <- liftIO (newEmptySV :: IO (MSampleVar Integer))
pidv <- liftIO $ newEmptyMVar
tid <- liftIO $ forkIO $ void $ tryIO $ do
bytes <- readSV v
p <- createProcess $
(proc cmd (toCommand params))
{ std_in = CreatePipe
, std_err = CreatePipe
}
putMVar pidv (processHandle p)
hClose $ stderrHandle p
let h = stdinHandle p
let send b = do
hPrint h b
hFlush h
send bytes
forever $
send =<< readSV v
let feeder = \n -> do
meterupdate n
writeSV v (fromBytesProcessed n)
-- It can easily take 0.3 seconds to clean up after
-- the transferinfo, and all that's involved is shutting
-- down the process and associated thread cleanly. So,
-- do it in the background.
let cleanup = forkIO $ do
void $ tryIO $ killThread tid
void $ tryNonAsync $
maybe noop (void . waitForProcess)
=<< tryTakeMVar pidv
bracketIO noop (const cleanup) (const $ a feeder)
copyFromRemoteCheap :: Remote -> State -> Key -> AssociatedFile -> FilePath -> Annex Bool
copyFromRemoteCheap r st key af file = do
repo <- getRepo r
copyFromRemoteCheap' repo r st key af file
copyFromRemoteCheap' :: Git.Repo -> Remote -> State -> Key -> AssociatedFile -> FilePath -> Annex Bool
#ifndef mingw32_HOST_OS
copyFromRemoteCheap' repo r st key af file
| not $ Git.repoIsUrl repo = guardUsable repo (return False) $ do
gc <- getGitConfigFromState st
loc <- liftIO $ gitAnnexLocation key repo gc
liftIO $ ifM (doesFileExist loc)
( do
absloc <- absPath loc
catchBoolIO $ do
createSymbolicLink absloc file
return True
, return False
)
| Git.repoIsSsh repo =
ifM (Annex.Content.preseedTmp key file)
( fst <$> copyFromRemote' True r st key af file nullMeterUpdate
, return False
)
| otherwise = return False
#else
copyFromRemoteCheap' _ _ _ _ _ _ = return False
#endif
{- Tries to copy a key's content to a remote's annex. -}
copyToRemote :: Remote -> State -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
copyToRemote r st key file meterupdate = do
repo <- getRepo r
copyToRemote' repo r st key file meterupdate
copyToRemote' :: Git.Repo -> Remote -> State -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
copyToRemote' repo r st@(State connpool duc _ _) key file meterupdate
| not $ Git.repoIsUrl repo = ifM duc
( guardUsable repo (return False) $ commitOnCleanup repo r $
copylocal =<< Annex.Content.prepSendAnnex key
, return False
)
| Git.repoIsSsh repo = commitOnCleanup repo r $
P2PHelper.store
(\p -> Ssh.runProto r connpool (return False) (copyremotefallback p))
key file meterupdate
| otherwise = giveup "copying to non-ssh repo not supported"
where
copylocal Nothing = return False
copylocal (Just (object, checksuccess)) = do
-- The checksuccess action is going to be run in
-- the remote's Annex, but it needs access to the local
-- Annex monad's state.
checksuccessio <- Annex.withCurrentState checksuccess
params <- Ssh.rsyncParams r Upload
u <- getUUID
hardlink <- wantHardLink
-- run copy from perspective of remote
onLocalFast repo r $ ifM (Annex.Content.inAnnex key)
( return True
, do
ensureInitialized
copier <- mkCopier hardlink st params
let verify = Annex.Content.RemoteVerify r
let rsp = RetrievalAllKeysSecure
runTransfer (Transfer Download u key) file stdRetry $ \p ->
let p' = combineMeterUpdate meterupdate p
in Annex.Content.saveState True `after`
Annex.Content.getViaTmp rsp verify key
(\dest -> copier object dest p' (liftIO checksuccessio))
)
copyremotefallback p = Annex.Content.sendAnnex key noop $ \object -> do
-- This is too broad really, but recvkey normally
-- verifies content anyway, so avoid complicating
-- it with a local sendAnnex check and rollback.
unlocked <- isDirect <||> versionSupportsUnlockedPointers
oh <- mkOutputHandlerQuiet
Ssh.rsyncHelper oh (Just p)
=<< Ssh.rsyncParamsRemote unlocked r Upload key object file
fsckOnRemote :: Git.Repo -> [CommandParam] -> Annex (IO Bool)
fsckOnRemote r params
| Git.repoIsUrl r = do
s <- Ssh.git_annex_shell NoConsumeStdin r "fsck" params []
return $ case s of
Nothing -> return False
Just (c, ps) -> batchCommand c ps
| otherwise = return $ do
program <- programPath
r' <- Git.Config.read r
environ <- getEnvironment
let environ' = addEntries
[ ("GIT_WORK_TREE", Git.repoPath r')
, ("GIT_DIR", Git.localGitDir r')
] environ
batchCommandEnv program (Param "fsck" : params) (Just environ')
{- The passed repair action is run in the Annex monad of the remote. -}
repairRemote :: Git.Repo -> Annex Bool -> Annex (IO Bool)
repairRemote r a = return $ do
s <- Annex.new r
Annex.eval s $ do
Annex.BranchState.disableUpdate
ensureInitialized
a `finally` stopCoProcesses
{- Runs an action from the perspective of a local remote.
-
- The AnnexState is cached for speed and to avoid resource leaks.
- However, coprocesses are stopped after each call to avoid git
- processes hanging around on removable media.
-}
onLocal :: Git.Repo -> Remote -> Annex a -> Annex a
onLocal repo r a = do
m <- Annex.getState Annex.remoteannexstate
go =<< maybe
(liftIO $ Annex.new repo)
return
(M.lookup (uuid r) m)
where
cache st = Annex.changeState $ \s -> s
{ Annex.remoteannexstate = M.insert (uuid r) st (Annex.remoteannexstate s) }
go st = do
curro <- Annex.getState Annex.output
(ret, st') <- liftIO $ Annex.run (st { Annex.output = curro }) $
a `finally` stopCoProcesses
cache st'
return ret
{- Faster variant of onLocal.
-
- The repository's git-annex branch is not updated, as an optimisation.
- No caller of onLocalFast can query data from the branch and be ensured
- it gets the most current value. Caller of onLocalFast can make changes
- to the branch, however.
-}
onLocalFast :: Git.Repo -> Remote -> Annex a -> Annex a
onLocalFast repo r a = onLocal repo r $ Annex.BranchState.disableUpdate >> a
-- To avoid the overhead of trying copy-on-write every time, it's tried
-- once and if it fails, is not tried again.
newtype CopyCoWTried = CopyCoWTried (MVar Bool)
newCopyCoWTried :: IO CopyCoWTried
newCopyCoWTried = CopyCoWTried <$> newEmptyMVar
{- Copys a file. Uses copy-on-write if it is supported. Otherwise,
- uses rsync, so that interrupted copies can be resumed. -}
rsyncOrCopyFile :: State -> [CommandParam] -> FilePath -> FilePath -> MeterUpdate -> Annex Bool
rsyncOrCopyFile st rsyncparams src dest p =
#ifdef mingw32_HOST_OS
-- rsync is only available on Windows in some installation methods,
-- and is not strictly needed here, so don't use it.
docopywith copyFileExternal
where
#else
-- If multiple threads reach this at the same time, they
-- will both try CoW, which is acceptable.
ifM (liftIO $ isEmptyMVar copycowtried)
( do
ok <- docopycow
void $ liftIO $ tryPutMVar copycowtried ok
pure ok <||> dorsync
, ifM (liftIO $ readMVar copycowtried)
( docopycow <||> dorsync
, dorsync
)
)
where
copycowtried = case st of
State _ _ (CopyCoWTried v) _ -> v
dorsync = do
-- dest may already exist, so make sure rsync can write to it
void $ liftIO $ tryIO $ allowWrite dest
oh <- mkOutputHandler
Ssh.rsyncHelper oh (Just p) $
rsyncparams ++ [File src, File dest]
docopycow = docopywith copyCoW
#endif
docopywith a = liftIO $ watchFileSize dest p $
a CopyTimeStamps src dest
commitOnCleanup :: Git.Repo -> Remote -> Annex a -> Annex a
commitOnCleanup repo r a = go `after` a
where
go = Annex.addCleanup (RemoteCleanup $ uuid r) cleanup
cleanup
| not $ Git.repoIsUrl repo = onLocalFast repo r $
doQuietSideAction $
Annex.Branch.commit =<< Annex.Branch.commitMessage
| otherwise = void $ do
Just (shellcmd, shellparams) <-
Ssh.git_annex_shell NoConsumeStdin
repo "commit" [] []
-- Throw away stderr, since the remote may not
-- have a new enough git-annex shell to
-- support committing.
liftIO $ catchMaybeIO $
withQuietOutput createProcessSuccess $
proc shellcmd $
toCommand shellparams
wantHardLink :: Annex Bool
wantHardLink = (annexHardLink <$> Annex.getGitConfig)
-- Not direct mode files because they can be modified at any time.
<&&> (not <$> isDirect)
-- Not unlocked files that are hard linked in the work tree,
-- because they can be modified at any time.
<&&> (not <$> annexThin <$> Annex.getGitConfig)
-- Copies from src to dest, updating a meter. If the copy finishes
-- successfully, calls a final check action, which must also succeed, or
-- returns false.
--
-- If either the remote or local repository wants to use hard links,
-- the copier will do so (falling back to copying if a hard link cannot be
-- made).
--
-- When a hard link is created, returns Verified; the repo being linked
-- from is implicitly trusted, so no expensive verification needs to be
-- done.
type Copier = FilePath -> FilePath -> MeterUpdate -> Annex Bool -> Annex (Bool, Verification)
mkCopier :: Bool -> State -> [CommandParam] -> Annex Copier
mkCopier remotewanthardlink st rsyncparams = do
let copier = \src dest p check -> unVerified $
rsyncOrCopyFile st rsyncparams src dest p <&&> check
localwanthardlink <- wantHardLink
let linker = \src dest -> createLink src dest >> return True
ifM (pure (remotewanthardlink || localwanthardlink) <&&> not <$> isDirect)
( return $ \src dest p check ->
ifM (liftIO (catchBoolIO (linker src dest)))
( return (True, Verified)
, copier src dest p check
)
, return copier
)
{- Normally the UUID of a local repository is checked at startup,
- but annex-checkuuid config can prevent that. To avoid getting
- confused, a deferred check is done just before the repository
- is used.
- This returns False when the repository UUID is not as expected. -}
type DeferredUUIDCheck = Annex Bool
data State = State Ssh.P2PSshConnectionPool DeferredUUIDCheck CopyCoWTried (Annex (Git.Repo, GitConfig))
getRepoFromState :: State -> Annex Git.Repo
getRepoFromState (State _ _ _ a) = fst <$> a
#ifndef mingw32_HOST_OS
{- The config of the remote git repository, cached for speed. -}
getGitConfigFromState :: State -> Annex GitConfig
getGitConfigFromState (State _ _ _ a) = snd <$> a
#endif
mkState :: Git.Repo -> UUID -> RemoteGitConfig -> Annex State
mkState r u gc = do
pool <- Ssh.mkP2PSshConnectionPool
copycowtried <- liftIO newCopyCoWTried
(duc, getrepo) <- go
return $ State pool duc copycowtried getrepo
where
go
| remoteAnnexCheckUUID gc = return
(return True, return (r, extractGitConfig r))
| otherwise = do
rv <- liftIO newEmptyMVar
let getrepo = ifM (liftIO $ isEmptyMVar rv)
( do
r' <- tryGitConfigRead False r
let t = (r', extractGitConfig r')
void $ liftIO $ tryPutMVar rv t
return t
, liftIO $ readMVar rv
)
cv <- liftIO newEmptyMVar
let duc = ifM (liftIO $ isEmptyMVar cv)
( do
r' <- fst <$> getrepo
u' <- getRepoUUID r'
let ok = u' == u
void $ liftIO $ tryPutMVar cv ok
unless ok $
warning $ Git.repoDescribe r ++ " is not the expected repository. The remote's annex-checkuuid configuration prevented noticing the change until now."
return ok
, liftIO $ readMVar cv
)
return (duc, getrepo)
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