104 lines
3 KiB
Haskell
104 lines
3 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010,2015 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Command.Lock where
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import Command
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import qualified Annex
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import Annex.Content
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import Annex.Link
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import Annex.InodeSentinal
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import Annex.Perms
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import Annex.ReplaceFile
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import Utility.InodeCache
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import qualified Database.Keys
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import Annex.Ingest
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import Logs.Location
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import Git.FilePath
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import qualified Utility.RawFilePath as R
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import System.PosixCompat.Files (linkCount)
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cmd :: Command
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cmd = withAnnexOptions [jsonOptions, annexedMatchingOptions] $
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command "lock" SectionCommon
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"undo unlock command"
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paramPaths (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek ps = withFilesInGitAnnex ww seeker =<< workTreeItems ww ps
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where
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ww = WarnUnmatchLsFiles "lock"
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seeker = AnnexedFileSeeker
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{ startAction = const start
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, checkContentPresent = Nothing
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, usesLocationLog = False
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}
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start :: SeekInput -> RawFilePath -> Key -> CommandStart
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start si file key = ifM (isJust <$> isAnnexLink file)
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( stop
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, starting "lock" (mkActionItem (key, file)) si $
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go =<< liftIO (isPointerFile file)
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)
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where
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go (Just key')
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| key' == key = cont
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| otherwise = errorModified
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go Nothing =
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ifM (isUnmodified key file)
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( cont
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, ifM (Annex.getRead Annex.force)
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( cont
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, errorModified
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)
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)
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cont = perform file key
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perform :: RawFilePath -> Key -> CommandPerform
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perform file key = do
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lockdown =<< calcRepo (gitAnnexLocation key)
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addSymlink file key =<< withTSDelta (liftIO . genInodeCache file)
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next $ return True
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where
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lockdown obj = do
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ifM (isUnmodified key obj)
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( breakhardlink obj
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, repopulate obj
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)
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whenM (liftIO $ R.doesPathExist obj) $
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freezeContent obj
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-- It's ok if the file is hard linked to obj, but if some other
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-- associated file is, we need to break that link to lock down obj.
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breakhardlink obj = whenM (catchBoolIO $ (> 1) . linkCount <$> liftIO (R.getFileStatus obj)) $ do
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mfc <- withTSDelta (liftIO . genInodeCache file)
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unlessM (sameInodeCache obj (maybeToList mfc)) $ do
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modifyContentDir obj $ replaceGitAnnexDirFile (fromRawFilePath obj) $ \tmp -> do
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unlessM (checkedCopyFile key obj tmp Nothing) $
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giveup "unable to lock file"
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Database.Keys.storeInodeCaches key [obj]
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-- Try to repopulate obj from an unmodified associated file.
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repopulate obj = modifyContentDir obj $ do
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g <- Annex.gitRepo
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fs <- map (`fromTopFilePath` g)
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<$> Database.Keys.getAssociatedFiles key
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mfile <- firstM (isUnmodified key) fs
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liftIO $ removeWhenExistsWith R.removeLink obj
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case mfile of
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Just unmodified ->
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ifM (checkedCopyFile key unmodified obj Nothing)
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( Database.Keys.storeInodeCaches key [obj]
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, lostcontent
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)
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Nothing -> lostcontent
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lostcontent = logStatus key InfoMissing
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errorModified :: a
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errorModified = giveup "Locking this file would discard any changes you have made to it. Use 'git annex add' to stage your changes. (Or, use --force to override)"
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