2a45b5ae9a
This was already prevented in other ways, but as seen in commit
c30fd24d91, those were a bit fragile.
And I'm not sure races were avoided in every case before. At least a
race between two separate git-annex processes, dropping the same
content, seemed possible.
This way, if locking fails, and the content is not present, it will
always do the right thing. Also, it avoids the overhead of an unncessary
inAnnex check for every file.
This commit was sponsored by Denis Dzyubenko on Patreon.
59 lines
1.4 KiB
Haskell
59 lines
1.4 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010,2016 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.DropKey where
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import Command
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import qualified Annex
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import Logs.Location
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import Annex.Content
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cmd :: Command
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cmd = noCommit $ withGlobalOptions [jsonOptions] $
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command "dropkey" SectionPlumbing
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"drops annexed content for specified keys"
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(paramRepeating paramKey)
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(seek <$$> optParser)
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data DropKeyOptions = DropKeyOptions
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{ toDrop :: [String]
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, batchOption :: BatchMode
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}
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optParser :: CmdParamsDesc -> Parser DropKeyOptions
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optParser desc = DropKeyOptions
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<$> cmdParams desc
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<*> parseBatchOption
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seek :: DropKeyOptions -> CommandSeek
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seek o = do
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unlessM (Annex.getState Annex.force) $
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giveup "dropkey can cause data loss; use --force if you're sure you want to do this"
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withKeys (commandAction . start) (toDrop o)
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case batchOption o of
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Batch fmt -> batchInput fmt (pure . parsekey) $
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batchCommandAction . start
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NoBatch -> noop
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where
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parsekey = maybe (Left "bad key") Right . deserializeKey
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start :: Key -> CommandStart
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start key = starting "dropkey" (mkActionItem key) $
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perform key
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perform :: Key -> CommandPerform
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perform key = ifM (inAnnex key)
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( lockContentForRemoval key (next $ cleanup key) $ \contentlock -> do
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removeAnnex contentlock
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next $ cleanup key
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, next $ return True
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)
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cleanup :: Key -> CommandCleanup
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cleanup key = do
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logStatus key InfoMissing
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return True
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