40ecf58d4b
This does not change the overall license of the git-annex program, which was already AGPL due to a number of sources files being AGPL already. Legally speaking, I'm adding a new license under which these files are now available; I already released their current contents under the GPL license. Now they're dual licensed GPL and AGPL. However, I intend for all my future changes to these files to only be released under the AGPL license, and I won't be tracking the dual licensing status, so I'm simply changing the license statement to say it's AGPL. (In some cases, others wrote parts of the code of a file and released it under the GPL; but in all cases I have contributed a significant portion of the code in each file and it's that code that is getting the AGPL license; the GPL license of other contributors allows combining with AGPL code.)
85 lines
2.8 KiB
Haskell
85 lines
2.8 KiB
Haskell
{- git-annex command
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-
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- Copyright 2013 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.Repair where
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import Command
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import qualified Annex
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import qualified Git.Repair
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import qualified Annex.Branch
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import qualified Git.Ref
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import Git.Types
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import Annex.Version
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cmd :: Command
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cmd = noCommit $ dontCheck repoExists $
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command "repair" SectionMaintenance
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"recover broken git repository"
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paramNothing (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek = withNothing (commandAction start)
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start :: CommandStart
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start = next $ next $ runRepair =<< Annex.getState Annex.force
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runRepair :: Bool -> Annex Bool
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runRepair forced = do
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(ok, modifiedbranches) <- inRepo $
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Git.Repair.runRepair isAnnexSyncBranch forced
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-- This command can be run in git repos not using git-annex,
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-- so avoid git annex branch stuff in that case.
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whenM (isJust <$> getVersion) $
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repairAnnexBranch modifiedbranches
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return ok
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{- After git repository repair, the .git/annex/index file could
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- still be broken, by pointing to bad objects, or might just be corrupt on
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- its own. Since this index file is not used to stage things
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- for long durations of time, it can safely be deleted if it is broken.
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-
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- Otherwise, if the git-annex branch was modified by the repair,
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- commit the index file to the git-annex branch.
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- This way, if the git-annex branch got rewound to an old version by
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- the repository repair, or was completely deleted, this will get it back
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- to a good state. Note that in the unlikely case where the git-annex
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- branch was rewound to a state that, had new changes from elsewhere not
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- yet reflected in the index, this does properly merge those into the
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- index before committing.
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-}
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repairAnnexBranch :: [Branch] -> Annex ()
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repairAnnexBranch modifiedbranches
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| Annex.Branch.fullname `elem` modifiedbranches = ifM okindex
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( commitindex
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, do
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nukeindex
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missingbranch
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)
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| otherwise = ifM okindex
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( noop
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, do
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nukeindex
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ifM (null <$> inRepo (Git.Ref.matching [Annex.Branch.fullname]))
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( missingbranch
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, liftIO $ putStrLn "No data was lost."
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)
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)
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where
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okindex = Annex.Branch.withIndex $ inRepo Git.Repair.checkIndex
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commitindex = do
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Annex.Branch.forceCommit "committing index after git repository repair"
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liftIO $ putStrLn "Successfully recovered the git-annex branch using .git/annex/index"
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nukeindex = do
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inRepo $ nukeFile . gitAnnexIndex
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liftIO $ putStrLn "Had to delete the .git/annex/index file as it was corrupt."
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missingbranch = liftIO $ putStrLn "Since the git-annex branch is not up-to-date anymore. It would be a very good idea to run: git annex fsck --fast"
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trackingOrSyncBranch :: Ref -> Bool
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trackingOrSyncBranch b = Git.Repair.isTrackingBranch b || isAnnexSyncBranch b
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isAnnexSyncBranch :: Ref -> Bool
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isAnnexSyncBranch b = "refs/synced/" `isPrefixOf` fromRef b
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