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|
{- Standard git remotes.
-
- Copyright 2011-2012 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Remote.Git (
remote,
configRead,
repoAvail,
) where
import Common.Annex
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 Annex.Init
import Types.Key
import Types.CleanupActions
import qualified CmdLine.GitAnnexShell.Fields as Fields
import Logs.Location
import Utility.Metered
#ifndef mingw32_HOST_OS
import Utility.CopyFile
#endif
import Utility.Env
import Utility.Batch
import Remote.Helper.Git
import Remote.Helper.Messages
import qualified Remote.Helper.Ssh as Ssh
import qualified Remote.GCrypt
import Annex.Path
import Creds
import Annex.CatFile
import Messages.Progress
import Types.NumCopies
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
}
list :: Bool -> Annex [Git.Repo]
list autoinit = do
c <- fromRepo Git.config
rs <- mapM (tweakurl c) =<< fromRepo Git.remotes
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 :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> Annex (RemoteConfig, UUID)
gitSetup Nothing _ c = do
let location = fromMaybe (error "Specify location=url") $
Url.parseURIRelaxed =<< M.lookup "location" c
g <- Annex.gitRepo
u <- case filter (\r -> Git.location r == Git.Url location) (Git.remotes g) of
[r] -> getRepoUUID r
[] -> error "could not find existing git remote with specified location"
_ -> error "found multiple git remotes with specified location"
return (c, u)
gitSetup (Just u) _ c = do
inRepo $ Git.Command.run
[ Param "remote"
, Param "add"
, Param $ fromMaybe (error "no name") (M.lookup "name" c)
, Param $ fromMaybe (error "no location") (M.lookup "location" c)
]
return (c, u)
{- 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.
-
- 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
case (repoCheap r, remoteAnnexIgnore gc, u) of
(_, True, _) -> return r
(True, _, _) -> tryGitConfigRead autoinit r
(False, _, NoUUID) -> tryGitConfigRead autoinit r
_ -> return r
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc
| Git.GCrypt.isEncrypted r = Remote.GCrypt.chainGen r u c gc
| otherwise = go <$> remoteCost gc defcst
where
defcst = if repoCheap r then cheapRemoteCost else expensiveRemoteCost
go cst = Just new
where
new = Remote
{ uuid = u
, cost = cst
, name = Git.repoDescribe r
, storeKey = copyToRemote new
, retrieveKeyFile = copyFromRemote new
, retrieveKeyFileCheap = copyFromRemoteCheap new
, removeKey = dropKey new
, lockContent = Just (lockKey new)
, checkPresent = inAnnex new
, checkPresentCheap = repoCheap r
, 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
, repo = r
, gitconfig = gc
{ remoteGitConfig = Just $ extractGitConfig r }
, readonly = Git.repoIsHttp r
, 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 r (pipedconfig, return (Left $ error "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
when (getUncachedUUID r' == NoUUID && not (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 = do
uo <- Url.getUrlOptions
v <- liftIO $ withTmpFile "git-annex.tmp" $ \tmpfile h -> do
hClose h
let url = Git.repoLocation r ++ "/config"
ifM (Url.downloadQuiet url tmpfile uo)
( pipedconfig "git" [Param "config", Param "--null", Param "--list", Param "--file", File tmpfile]
, return $ Left $ error $ "unable to load config from " ++ url
)
case v of
Left _ -> do
set_ignore "not usable by git-annex" False
return r
Right r' -> do
-- Cache when http remote is not bare for
-- optimisation.
unless (Git.Config.isBare r') $
setremote "annex-bare" (Git.Config.boolConfig False)
return r'
store = observe $ \r' -> do
g <- gitRepo
let l = Git.remotes g
let g' = g { Git.remotes = exchange l r' }
Annex.changeState $ \s -> s { Annex.repo = g' }
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
let k = "annex-ignore"
case Git.remoteName r of
Nothing -> noop
Just n -> do
warning $ "Remote " ++ n ++ " " ++ msg ++ "; setting " ++ k
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 config remote." ++ n ++ "." ++ k ++ " false"
setremote k (Git.Config.boolConfig True)
setremote k v = case Git.remoteName r of
Nothing -> noop
Just n -> do
let k' = "remote." ++ n ++ "." ++ k
inRepo $ Git.Command.run [Param "config", Param k', Param 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
s <- Annex.new r
Annex.eval s $ do
Annex.BranchState.disableUpdate
void $ tryNonAsync $ ensureInitialized
Annex.getState Annex.repo
configlistfields = if autoinit
then [(Fields.autoInit, "1")]
else []
{- Checks if a given remote has the content for a key in its annex. -}
inAnnex :: Remote -> Key -> Annex Bool
inAnnex rmt key
| Git.repoIsHttp r = checkhttp
| Git.repoIsUrl r = checkremote
| otherwise = checklocal
where
r = repo rmt
checkhttp = do
showChecking r
ifM (Url.withUrlOptions $ \uo -> anyM (\u -> Url.checkBoth u (keySize key) uo) (keyUrls rmt key))
( return True
, error "not found"
)
checkremote = Ssh.inAnnex r key
checklocal = guardUsable r (cantCheck r) $
maybe (cantCheck r) return
=<< onLocal rmt (Annex.Content.inAnnexSafe key)
keyUrls :: Remote -> Key -> [String]
keyUrls r key = map tourl locs'
where
tourl l = Git.repoLocation (repo r) ++ "/" ++ 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 cfg key)
| otherwise = annexLocations cfg key
#ifndef mingw32_HOST_OS
locs' = locs
#else
locs' = map (replace "\\" "/") locs
#endif
remoteconfig = gitconfig r
cfg = fromJust $ remoteGitConfig remoteconfig
dropKey :: Remote -> Key -> Annex Bool
dropKey r key
| not $ Git.repoIsUrl (repo r) =
guardUsable (repo r) (return False) $
commitOnCleanup r $ onLocal r $ do
ensureInitialized
whenM (Annex.Content.inAnnex key) $ do
Annex.Content.lockContentExclusive key
Annex.Content.removeAnnex
logStatus key InfoMissing
Annex.Content.saveState True
return True
| Git.repoIsHttp (repo r) = error "dropping from http remote not supported"
| otherwise = commitOnCleanup r $ Ssh.dropKey (repo r) key
lockKey :: Remote -> Key -> (VerifiedCopy -> Annex r) -> Annex r
lockKey r key a
| not $ Git.repoIsUrl (repo r) =
guardUsable (repo r) cantlock $
onLocal r $ Annex.Content.lockContentShared key a
| Git.repoIsHttp (repo r) = cantlock
| otherwise = error "TODO"
where
cantlock = error "can't lock content"
{- Tries to copy a key's content from a remote's annex to a file. -}
copyFromRemote :: Remote -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
copyFromRemote r key file dest p = parallelMetered (Just p) key file $
copyFromRemote' r key file dest
copyFromRemote' :: Remote -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)
copyFromRemote' r key file dest meterupdate
| not $ Git.repoIsUrl (repo r) = guardUsable (repo r) (unVerified (return False)) $ do
params <- Ssh.rsyncParams r Download
u <- getUUID
hardlink <- wantHardLink
-- run copy from perspective of remote
onLocal r $ do
ensureInitialized
v <- Annex.Content.prepSendAnnex key
case v of
Nothing -> return (False, UnVerified)
Just (object, checksuccess) -> do
copier <- mkCopier hardlink params
runTransfer (Transfer Download u key)
file noRetry noObserver
(\p -> copier object dest p checksuccess)
| Git.repoIsSsh (repo r) = unVerified $ feedprogressback $ \feeder -> do
direct <- isDirect
Ssh.rsyncHelper (Just feeder)
=<< Ssh.rsyncParamsRemote direct r Download key dest file
| Git.repoIsHttp (repo r) = unVerified $ Annex.Content.downloadUrl (keyUrls r key) dest
| otherwise = error "copying from non-ssh, non-http remote not supported"
where
{- 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 fields = (Fields.remoteUUID, fromUUID u)
: maybe [] (\f -> [(Fields.associatedFile, f)]) file
Just (cmd, params) <- Ssh.git_annex_shell (repo r) "transferinfo"
[Param $ key2file 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 -> Key -> AssociatedFile -> FilePath -> Annex Bool
#ifndef mingw32_HOST_OS
copyFromRemoteCheap r key af file
| not $ Git.repoIsUrl (repo r) = guardUsable (repo r) (return False) $ liftIO $ do
loc <- gitAnnexLocation key (repo r) $
fromJust $ remoteGitConfig $ gitconfig r
ifM (doesFileExist loc)
( do
absloc <- absPath loc
catchBoolIO $ do
createSymbolicLink absloc file
return True
, return False
)
| Git.repoIsSsh (repo r) =
ifM (Annex.Content.preseedTmp key file)
( fst <$> parallelMetered Nothing key af
(copyFromRemote' r key af file)
, return False
)
| otherwise = return False
#else
copyFromRemoteCheap _ _ _ _ = return False
#endif
{- Tries to copy a key's content to a remote's annex. -}
copyToRemote :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
copyToRemote r key file p = parallelMetered (Just p) key file $ copyToRemote' r key file
copyToRemote' :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
copyToRemote' r key file p
| not $ Git.repoIsUrl (repo r) =
guardUsable (repo r) (return False) $ commitOnCleanup r $
copylocal =<< Annex.Content.prepSendAnnex key
| Git.repoIsSsh (repo r) = commitOnCleanup r $
Annex.Content.sendAnnex key noop $ \object -> do
direct <- isDirect
Ssh.rsyncHelper (Just p)
=<< Ssh.rsyncParamsRemote direct r Upload key object file
| otherwise = error "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 current
-- Annex monad's state.
checksuccessio <- Annex.withCurrentState checksuccess
params <- Ssh.rsyncParams r Upload
u <- getUUID
hardlink <- wantHardLink
-- run copy from perspective of remote
onLocal r $ ifM (Annex.Content.inAnnex key)
( return True
, do
ensureInitialized
copier <- mkCopier hardlink params
let verify = Annex.Content.RemoteVerify r
runTransfer (Transfer Download u key) file noRetry noObserver $ const $
Annex.Content.saveState True `after`
Annex.Content.getViaTmp verify key
(\dest -> copier object dest p (liftIO checksuccessio))
)
fsckOnRemote :: Git.Repo -> [CommandParam] -> Annex (IO Bool)
fsckOnRemote r params
| Git.repoIsUrl r = do
s <- Ssh.git_annex_shell 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
{- Runs an action from the perspective of a local remote.
-
- The AnnexState is cached for speed and to avoid resource leaks.
- However, catFileStop is called to avoid git-cat-file processes hanging
- around on removable media.
-
- The repository's git-annex branch is not updated, as an optimisation.
- No caller of onLocal can query data from the branch and be ensured
- it gets a current value. Caller of onLocal can make changes to
- the branch, however.
-}
onLocal :: Remote -> Annex a -> Annex a
onLocal r a = do
m <- Annex.getState Annex.remoteannexstate
case M.lookup (uuid r) m of
Nothing -> do
st <- liftIO $ Annex.new (repo r)
go st $ do
Annex.BranchState.disableUpdate
a
Just st -> go st a
where
cache st = Annex.changeState $ \s -> s
{ Annex.remoteannexstate = M.insert (uuid r) st (Annex.remoteannexstate s) }
go st a' = do
curro <- Annex.getState Annex.output
(ret, st') <- liftIO $ Annex.run (st { Annex.output = curro }) $
catFileStop `after` a'
cache st'
return ret
{- Copys a file with rsync unless both locations are on the same
- filesystem. Then cp could be faster. -}
rsyncOrCopyFile :: [CommandParam] -> FilePath -> FilePath -> MeterUpdate -> Annex Bool
rsyncOrCopyFile rsyncparams src dest p =
#ifdef mingw32_HOST_OS
dorsync
where
#else
ifM (sameDeviceIds src dest) (docopy, dorsync)
where
sameDeviceIds a b = (==) <$> getDeviceId a <*> getDeviceId b
getDeviceId f = deviceID <$> liftIO (getFileStatus $ parentDir f)
docopy = liftIO $ bracket
(forkIO $ watchfilesize zeroBytesProcessed)
(void . tryIO . killThread)
(const $ copyFileExternal CopyTimeStamps src dest)
watchfilesize oldsz = do
threadDelay 500000 -- 0.5 seconds
v <- catchMaybeIO $ toBytesProcessed <$> getFileSize dest
case v of
Just sz
| sz /= oldsz -> do
p sz
watchfilesize sz
_ -> watchfilesize oldsz
#endif
dorsync = Ssh.rsyncHelper (Just p) $
rsyncparams ++ [File src, File dest]
commitOnCleanup :: Remote -> Annex a -> Annex a
commitOnCleanup r a = go `after` a
where
go = Annex.addCleanup (RemoteCleanup $ uuid r) cleanup
cleanup
| not $ Git.repoIsUrl (repo r) = onLocal r $
doQuietSideAction $
Annex.Branch.commit "update"
| otherwise = void $ do
Just (shellcmd, shellparams) <-
Ssh.git_annex_shell (repo r) "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 <$> Annex.getGitConfig) <&&> (not <$> isDirect)
-- Copies from src to dest, updating a meter. If the copy finishes
-- successfully, calls a final check action, which must also success, 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 -> [CommandParam] -> Annex Copier
mkCopier remotewanthardlink rsyncparams = do
let copier = \src dest p check -> unVerified $
rsyncOrCopyFile rsyncparams src dest p <&&> check
#ifndef mingw32_HOST_OS
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
)
#else
return copier
#endif
|