554 lines
18 KiB
Haskell
554 lines
18 KiB
Haskell
{- git-annex command
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-
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- Copyright 2017-2023 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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{-# LANGUAGE TupleSections, BangPatterns #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Command.Export where
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import Command
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import qualified Annex
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import qualified Git
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import qualified Git.DiffTree
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import qualified Git.LsTree
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import qualified Git.Tree
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import qualified Git.Ref
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import Git.Types
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import Git.FilePath
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import Git.Sha
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import qualified Remote
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import Types.Remote
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import Types.Export
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import Annex.Export
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import Annex.Content
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import Annex.Transfer
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import Annex.CatFile
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import Annex.FileMatcher
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import Annex.RemoteTrackingBranch
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import Logs.Location
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import Logs.Export
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import Logs.PreferredContent
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import Database.Export
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import Config
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import Utility.Tmp
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import Utility.Metered
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import Utility.Matcher
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import qualified Data.ByteString.Char8 as S8
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Map as M
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import Control.Concurrent
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cmd :: Command
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cmd = withAnnexOptions [jobsOption, jsonOptions, jsonProgressOption] $
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command "export" SectionCommon
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"export a tree of files to a special remote"
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paramTreeish (seek <$$> optParser)
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data ExportOptions = ExportOptions
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{ exportTreeish :: Git.Ref
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-- ^ can be a tree, a branch, a commit, or a tag
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, exportRemote :: DeferredParse Remote
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, exportTracking :: Bool
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}
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optParser :: CmdParamsDesc -> Parser ExportOptions
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optParser _ = ExportOptions
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<$> (Git.Ref <$> parsetreeish)
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<*> (mkParseRemoteOption <$> parseToOption)
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<*> parsetracking
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where
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parsetreeish = argument str
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( metavar paramTreeish
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)
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parsetracking = switch
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( long "tracking"
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<> help ("track changes to the " ++ paramTreeish ++ " (deprecated)")
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)
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-- To handle renames which swap files, the exported file is first renamed
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-- to a stable temporary name based on the key.
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exportTempName :: Key -> ExportLocation
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exportTempName ek = mkExportLocation $ toRawFilePath $
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".git-annex-tmp-content-" ++ serializeKey ek
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seek :: ExportOptions -> CommandSeek
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seek o = startConcurrency commandStages $ do
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r <- getParsed (exportRemote o)
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unlessM (isExportSupported r) $
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giveup "That remote does not support exports."
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-- handle deprecated option
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when (exportTracking o) $
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setConfig (remoteAnnexConfig r "tracking-branch")
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(fromRef $ exportTreeish o)
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tree <- filterExport r =<<
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fromMaybe (giveup "unknown tree") <$>
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inRepo (Git.Ref.tree (exportTreeish o))
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mtbcommitsha <- getExportCommit r (exportTreeish o)
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db <- openDb (uuid r)
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writeLockDbWhile db $ do
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changeExport r db tree
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unlessM (Annex.getRead Annex.fast) $ do
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void $ fillExport r db tree mtbcommitsha
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closeDb db
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-- | When the treeish is a branch like master or refs/heads/master
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-- (but not refs/remotes/...), find the commit it points to
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-- and the corresponding remote tracking branch.
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--
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-- The treeish may also be a subdir within a branch, like master:subdir,
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-- that results in this returning the same thing it does for the master
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-- branch.
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getExportCommit :: Remote -> Git.Ref -> Annex (Maybe (RemoteTrackingBranch, Sha))
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getExportCommit r treeish
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| '/' `notElem` fromRef baseref = do
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let tb = mkRemoteTrackingBranch r baseref
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commitsha <- inRepo $ Git.Ref.sha $ Git.Ref.underBase refsheads baseref
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return (fmap (tb, ) commitsha)
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| otherwise = return Nothing
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where
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baseref = Ref $ S8.takeWhile (/= ':') $ fromRef' $
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Git.Ref.removeBase refsheads treeish
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refsheads = "refs/heads"
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-- | Changes what's exported to the remote. Does not upload any new
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-- files, but does delete and rename files already exported to the remote.
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changeExport :: Remote -> ExportHandle -> ExportFiltered Git.Ref -> CommandSeek
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changeExport r db (ExportFiltered new) = do
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old <- getExport (uuid r)
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recordExportBeginning (uuid r) new
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-- Clean up after incomplete export of a tree, in which
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-- the next block of code below may have renamed some files to
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-- temp files. Diff from the incomplete tree to the new tree,
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-- and delete any temp files that the new tree can't use.
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let recover diff = commandAction $
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startRecoverIncomplete r db
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(Git.DiffTree.srcsha diff)
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(Git.DiffTree.file diff)
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forM_ (incompleteExportedTreeishes old) $ \incomplete ->
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mapdiff recover incomplete new
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waitForAllRunningCommandActions
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-- Diff the old and new trees, and delete or rename to new name all
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-- changed files in the export. After this, every file that remains
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-- in the export will have the content from the new treeish.
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--
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-- When there was an export conflict, this resolves it.
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--
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-- The ExportTree is also updated here to reflect the new tree.
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case exportedTreeishes old of
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[] -> updateExportTree db emptyTree new
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[oldtreesha] -> do
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diffmap <- mkDiffMap oldtreesha new db
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let seekdiffmap a = mapM_ a (M.toList diffmap)
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-- Rename old files to temp, or delete.
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let deleteoldf = \ek oldf -> commandAction $
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startUnexport' r db oldf ek
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seekdiffmap $ \case
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(ek, (oldf:oldfs, _newf:_)) -> do
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commandAction $
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startMoveToTempName r db oldf ek
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forM_ oldfs (deleteoldf ek)
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(ek, (oldfs, [])) ->
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forM_ oldfs (deleteoldf ek)
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(_ek, ([], _)) -> noop
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waitForAllRunningCommandActions
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-- Rename from temp to new files.
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seekdiffmap $ \case
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(ek, (_oldf:_, newf:_)) -> commandAction $
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startMoveFromTempName r db ek newf
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_ -> noop
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waitForAllRunningCommandActions
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ts -> do
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warning "Resolving export conflict.."
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forM_ ts $ \oldtreesha -> do
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-- Unexport both the srcsha and the dstsha,
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-- because the wrong content may have
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-- been renamed to the dstsha due to the
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-- export conflict.
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let unexportboth d =
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[ Git.DiffTree.srcsha d
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, Git.DiffTree.dstsha d
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]
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-- Don't rename to temp, because the
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-- content is unknown; delete instead.
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mapdiff
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(\diff -> commandAction $ startUnexport r db (Git.DiffTree.file diff) (unexportboth diff))
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oldtreesha new
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updateExportTree db emptyTree new
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waitForAllRunningCommandActions
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liftIO $ recordExportTreeCurrent db new
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-- Waiting until now to record the export guarantees that,
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-- if this export is interrupted, there are no files left over
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-- from a previous export, that are not part of this export.
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c <- Annex.getState Annex.errcounter
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when (c == 0) $ do
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recordExportUnderway (uuid r) $ ExportChange
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{ oldTreeish = exportedTreeishes old
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, newTreeish = new
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}
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where
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mapdiff a oldtreesha newtreesha = do
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(diff, cleanup) <- inRepo $
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Git.DiffTree.diffTreeRecursive oldtreesha newtreesha
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sequence_ $ map a diff
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void $ liftIO cleanup
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-- Map of old and new filenames for each changed Key in a diff.
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type DiffMap = M.Map Key ([TopFilePath], [TopFilePath])
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mkDiffMap :: Git.Ref -> Git.Ref -> ExportHandle -> Annex DiffMap
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mkDiffMap old new db = do
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(diff, cleanup) <- inRepo $ Git.DiffTree.diffTreeRecursive old new
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diffmap <- M.fromListWith combinedm . concat <$> forM diff mkdm
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void $ liftIO cleanup
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return diffmap
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where
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combinedm (srca, dsta) (srcb, dstb) = (srca ++ srcb, dsta ++ dstb)
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mkdm i = do
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srcek <- getek (Git.DiffTree.srcsha i)
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dstek <- getek (Git.DiffTree.dstsha i)
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updateExportTree' db srcek dstek i
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return $ catMaybes
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[ (, ([Git.DiffTree.file i], [])) <$> srcek
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, (, ([], [Git.DiffTree.file i])) <$> dstek
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]
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getek sha
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| sha `elem` nullShas = return Nothing
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| otherwise = Just <$> exportKey sha
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newtype FileUploaded = FileUploaded { fromFileUploaded :: Bool }
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newtype AllFilled = AllFilled { fromAllFilled :: Bool }
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-- | Upload all exported files that are not yet in the remote.
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--
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-- Returns True when some files were uploaded (perhaps not all of them).
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--
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-- Once all exported files have reached the remote, updates the
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-- remote tracking branch.
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fillExport :: Remote -> ExportHandle -> ExportFiltered Git.Ref -> Maybe (RemoteTrackingBranch, Sha) -> Annex Bool
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fillExport r db (ExportFiltered newtree) mtbcommitsha = do
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(l, cleanup) <- inRepo $ Git.LsTree.lsTree
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Git.LsTree.LsTreeRecursive
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(Git.LsTree.LsTreeLong False)
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newtree
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cvar <- liftIO $ newMVar (FileUploaded False)
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allfilledvar <- liftIO $ newMVar (AllFilled True)
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commandActions $
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map (startExport r db cvar allfilledvar) l
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void $ liftIO $ cleanup
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waitForAllRunningCommandActions
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case mtbcommitsha of
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Nothing -> noop
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Just (tb, commitsha) ->
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whenM (liftIO $ fromAllFilled <$> takeMVar allfilledvar) $
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makeRemoteTrackingBranchMergeCommit tb commitsha
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>>= setRemoteTrackingBranch tb
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liftIO $ fromFileUploaded <$> takeMVar cvar
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startExport :: Remote -> ExportHandle -> MVar FileUploaded -> MVar AllFilled -> Git.LsTree.TreeItem -> CommandStart
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startExport r db cvar allfilledvar ti = do
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ek <- exportKey (Git.LsTree.sha ti)
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stopUnless (notrecordedpresent ek) $
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starting ("export " ++ name r) ai si $
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ifM (either (const False) id <$> tryNonAsync (checkPresentExport (exportActions r) ek loc))
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( next $ cleanupExport r db ek loc False
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, do
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liftIO $ modifyMVar_ cvar (pure . const (FileUploaded True))
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performExport r db ek af (Git.LsTree.sha ti) loc allfilledvar
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)
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where
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loc = mkExportLocation f
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f = getTopFilePath (Git.LsTree.file ti)
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af = AssociatedFile (Just f)
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ai = ActionItemTreeFile f
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si = SeekInput []
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notrecordedpresent ek =
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ifM (liftIO $ notElem loc <$> getExportedLocation db ek)
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( return True
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-- When content was lost from the remote and
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-- a fsck noticed that, the export db will still
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-- list it as present in the remote. So also check
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-- location tracking.
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-- However, git sha keys do not have their locations
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-- tracked, and fsck doesn't check them, so not
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-- for those.
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, if isGitShaKey ek
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then return False
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else notElem (uuid r) <$> loggedLocations ek
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)
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performExport :: Remote -> ExportHandle -> Key -> AssociatedFile -> Sha -> ExportLocation -> MVar AllFilled -> CommandPerform
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performExport r db ek af contentsha loc allfilledvar = do
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let storer = storeExport (exportActions r)
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sent <- tryNonAsync $ if not (isGitShaKey ek)
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then ifM (inAnnex ek)
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( notifyTransfer Upload af $
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-- alwaysUpload because the same key
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-- could be used for more than one export
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-- location, and concurrently uploading
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-- of the content should still be allowed.
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alwaysUpload (uuid r) ek af Nothing stdRetry $ \pm -> do
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let rollback = void $
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performUnexport r db [ek] loc
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sendAnnex ek rollback $ \f _sz ->
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Remote.action $
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storer f ek loc pm
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, do
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showNote "not available"
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return False
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)
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-- Sending a non-annexed file.
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else withTmpFile "export" $ \tmp h -> do
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b <- catObject contentsha
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liftIO $ L.hPut h b
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liftIO $ hClose h
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Remote.action $
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storer tmp ek loc nullMeterUpdate
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let failedsend = liftIO $ modifyMVar_ allfilledvar (pure . const (AllFilled False))
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case sent of
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Right True -> next $ cleanupExport r db ek loc True
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Right False -> do
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failedsend
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stop
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Left err -> do
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failedsend
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throwM err
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cleanupExport :: Remote -> ExportHandle -> Key -> ExportLocation -> Bool -> CommandCleanup
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cleanupExport r db ek loc sent = do
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liftIO $ addExportedLocation db ek loc
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when (sent && not (isGitShaKey ek)) $
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logChange ek (uuid r) InfoPresent
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return True
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startUnexport :: Remote -> ExportHandle -> TopFilePath -> [Git.Sha] -> CommandStart
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startUnexport r db f shas = do
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eks <- forM (filter (`notElem` nullShas) shas) exportKey
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if null eks
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then stop
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else starting ("unexport " ++ name r) ai si $
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performUnexport r db eks loc
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where
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loc = mkExportLocation f'
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f' = getTopFilePath f
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ai = ActionItemTreeFile f'
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si = SeekInput []
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startUnexport' :: Remote -> ExportHandle -> TopFilePath -> Key -> CommandStart
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startUnexport' r db f ek =
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starting ("unexport " ++ name r) ai si $
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performUnexport r db [ek] loc
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where
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loc = mkExportLocation f'
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f' = getTopFilePath f
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ai = ActionItemTreeFile f'
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si = SeekInput []
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-- Unlike a usual drop from a repository, this does not check that
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-- numcopies is satisfied before removing the content. Typically an export
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-- remote is untrusted, so would not count as a copy anyway.
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-- Or, an export may be appendonly, and removing a file from it does
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-- not really remove the content, which must be accessible later on.
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performUnexport :: Remote -> ExportHandle -> [Key] -> ExportLocation -> CommandPerform
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performUnexport r db eks loc = do
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ifM (allM rm eks)
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( next $ cleanupUnexport r db eks loc
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, stop
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)
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where
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rm ek = Remote.action $ removeExport (exportActions r) ek loc
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cleanupUnexport :: Remote -> ExportHandle -> [Key] -> ExportLocation -> CommandCleanup
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cleanupUnexport r db eks loc = do
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liftIO $ do
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forM_ eks $ \ek ->
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removeExportedLocation db ek loc
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flushDbQueue db
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-- A versionedExport remote supports removeExportLocation to remove
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-- the file from the exported tree, but still retains the content
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-- and allows retrieving it.
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unless (versionedExport (exportActions r)) $ do
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remaininglocs <- liftIO $
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concat <$> forM eks (getExportedLocation db)
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when (null remaininglocs) $
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forM_ eks $ \ek ->
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logChange ek (uuid r) InfoMissing
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removeEmptyDirectories r db loc eks
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startRecoverIncomplete :: Remote -> ExportHandle -> Git.Sha -> TopFilePath -> CommandStart
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startRecoverIncomplete r db sha oldf
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| sha `elem` nullShas = stop
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| otherwise = do
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ek <- exportKey sha
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let loc = exportTempName ek
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let ai = ActionItemTreeFile (fromExportLocation loc)
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let si = SeekInput []
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starting ("unexport " ++ name r) ai si $ do
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liftIO $ removeExportedLocation db ek oldloc
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performUnexport r db [ek] loc
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where
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oldloc = mkExportLocation $ getTopFilePath oldf
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startMoveToTempName :: Remote -> ExportHandle -> TopFilePath -> Key -> CommandStart
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startMoveToTempName r db f ek = case renameExport (exportActions r) of
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Just _ -> starting ("rename " ++ name r) ai si $
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performRename r db ek loc tmploc
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Nothing -> starting ("unexport " ++ name r) ai' si $
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performUnexport r db [ek] loc
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where
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loc = mkExportLocation f'
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f' = getTopFilePath f
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tmploc = exportTempName ek
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ai = ActionItemOther $ Just $
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QuotedPath f' <> " -> " <> QuotedPath (fromExportLocation tmploc)
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ai' = ActionItemTreeFile (fromExportLocation loc)
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si = SeekInput []
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startMoveFromTempName :: Remote -> ExportHandle -> Key -> TopFilePath -> CommandStart
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startMoveFromTempName r db ek f = case renameExport (exportActions r) of
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Just _ -> stopUnless (liftIO $ elem tmploc <$> getExportedLocation db ek) $
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starting ("rename " ++ name r) ai si $
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performRename r db ek tmploc loc
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Nothing -> starting ("unexport " ++ name r) ai' si $
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performUnexport r db [ek] tmploc
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where
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loc = mkExportLocation f'
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f' = getTopFilePath f
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tmploc = exportTempName ek
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ai = ActionItemOther $ Just $
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QuotedPath (fromExportLocation tmploc) <> " -> " <> QuotedPath f'
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ai' = ActionItemTreeFile (fromExportLocation tmploc)
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si = SeekInput []
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performRename :: Remote -> ExportHandle -> Key -> ExportLocation -> ExportLocation -> CommandPerform
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performRename r db ek src dest = case renameExport (exportActions r) of
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Just renameaction -> tryNonAsync (renameaction ek src dest) >>= \case
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Right (Just ()) -> next $ cleanupRename r db ek src dest
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Left err -> do
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warning $ UnquotedString $ "rename failed (" ++ show err ++ "); deleting instead"
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fallbackdelete
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Right Nothing -> fallbackdelete
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-- remote does not support renaming
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Nothing -> fallbackdelete
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where
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fallbackdelete = performUnexport r db [ek] src
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cleanupRename :: Remote -> ExportHandle -> Key -> ExportLocation -> ExportLocation -> CommandCleanup
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cleanupRename r db ek src dest = do
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liftIO $ do
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removeExportedLocation db ek src
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addExportedLocation db ek dest
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flushDbQueue db
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if exportDirectories src /= exportDirectories dest
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then removeEmptyDirectories r db src [ek]
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else return True
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-- | Remove empty directories from the export. Call after removing an
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-- exported file, and after calling removeExportLocation and flushing the
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-- database.
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removeEmptyDirectories :: Remote -> ExportHandle -> ExportLocation -> [Key] -> Annex Bool
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removeEmptyDirectories r db loc ks
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| null (exportDirectories loc) = return True
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| otherwise = case removeExportDirectory (exportActions r) of
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Nothing -> return True
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Just removeexportdirectory -> do
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ok <- allM (go removeexportdirectory)
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(reverse (exportDirectories loc))
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unless ok $ liftIO $ do
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-- Add location back to export database,
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-- so this is tried again next time.
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forM_ ks $ \k ->
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addExportedLocation db k loc
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flushDbQueue db
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return ok
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where
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go removeexportdirectory d =
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ifM (liftIO $ isExportDirectoryEmpty db d)
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( Remote.action $ removeexportdirectory d
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, return True
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)
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-- | A value that has been filtered through the remote's preferred content
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-- expression.
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newtype ExportFiltered t = ExportFiltered t
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-- | Filters the tree to annexed files that are preferred content of the
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-- remote, and also including non-annexed files, but not submodules or
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-- non-annexed symlinks.
|
|
--
|
|
-- A log is written with tree items that were filtered out, so they can
|
|
-- be added back in when importing from the remote.
|
|
filterExport :: Remote -> Git.Ref -> Annex (ExportFiltered Git.Ref)
|
|
filterExport r tree = logExportExcluded (uuid r) $ \logwriter -> do
|
|
m <- preferredContentMap
|
|
case M.lookup (uuid r) m of
|
|
Just (matcher, matcherdesc) | not (isEmpty matcher) ->
|
|
ExportFiltered <$> go (Just (matcher, matcherdesc)) logwriter
|
|
_ -> ExportFiltered <$> go Nothing logwriter
|
|
where
|
|
go mmatcher logwriter = do
|
|
g <- Annex.gitRepo
|
|
Git.Tree.adjustTree
|
|
(check mmatcher logwriter)
|
|
[]
|
|
(\_old new -> new)
|
|
[]
|
|
tree
|
|
g
|
|
|
|
check mmatcher logwriter ti@(Git.Tree.TreeItem topf mode sha) =
|
|
case toTreeItemType mode of
|
|
-- Don't export submodule entries.
|
|
Just TreeSubmodule -> excluded
|
|
Just TreeSymlink -> checkkey True
|
|
_ -> checkkey False
|
|
where
|
|
excluded = do
|
|
() <- liftIO $ logwriter ti
|
|
return Nothing
|
|
|
|
checkkey issymlink =
|
|
case mmatcher of
|
|
Nothing
|
|
| issymlink -> catKey sha >>= \case
|
|
Just _ -> return (Just ti)
|
|
Nothing -> excluded
|
|
| otherwise -> return (Just ti)
|
|
Just matcher -> catKey sha >>= \case
|
|
Just k -> checkmatcher matcher k
|
|
Nothing
|
|
| issymlink -> excluded
|
|
| otherwise -> return (Just ti)
|
|
|
|
checkmatcher matcher k = do
|
|
let mi = MatchingInfo $ ProvidedInfo
|
|
{ providedFilePath = Just $
|
|
-- Match filename relative
|
|
-- to the top of the tree.
|
|
getTopFilePath topf
|
|
, providedKey = Just k
|
|
, providedFileSize = Nothing
|
|
, providedMimeType = Nothing
|
|
, providedMimeEncoding = Nothing
|
|
, providedLinkType = Nothing
|
|
}
|
|
ifM (checkMatcher' matcher mi mempty)
|
|
( return (Just ti)
|
|
, excluded
|
|
)
|