fa62c98910
This eliminates the distinction between decodeBS and decodeBS', encodeBS and encodeBS', etc. The old implementation truncated at NUL, and the primed versions had to do extra work to avoid that problem. The new implementation does not truncate at NUL, and is also a lot faster. (Benchmarked at 2x faster for decodeBS and 3x for encodeBS; more for the primed versions.) Note that filepath-bytestring 1.4.2.1.8 contains the same optimisation, and upgrading to it will speed up to/fromRawFilePath. AFAIK, nothing relied on the old behavior of truncating at NUL. Some code used the faster versions in places where I was sure there would not be a NUL. So this change is unlikely to break anything. Also, moved s2w8 and w82s out of the module, as they do not involve filesystem encoding really. Sponsored-by: Shae Erisson on Patreon
122 lines
3.2 KiB
Haskell
122 lines
3.2 KiB
Haskell
{- git-annex uuids
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-
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- Each git repository used by git-annex has an annex.uuid setting that
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- uniquely identifies that repository.
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-
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- UUIDs of remotes are cached in git config, using keys named
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- remote.<name>.annex-uuid
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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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{-# LANGUAGE OverloadedStrings #-}
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module Annex.UUID (
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configkeyUUID,
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getUUID,
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getRepoUUID,
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getUncachedUUID,
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isUUIDConfigured,
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prepUUID,
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genUUID,
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genUUIDInNameSpace,
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gCryptNameSpace,
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removeRepoUUID,
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storeUUID,
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storeUUIDIn,
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setUUID,
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webUUID,
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bitTorrentUUID,
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) where
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import Annex.Common
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import qualified Annex
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import qualified Git
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import qualified Git.Config
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import Git.Types
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import Config
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import qualified Data.UUID as U
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import qualified Data.UUID.V4 as U4
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import qualified Data.UUID.V5 as U5
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import Data.String
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configkeyUUID :: ConfigKey
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configkeyUUID = annexConfig "uuid"
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{- Generates a random UUID, that does not include the MAC address. -}
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genUUID :: IO UUID
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genUUID = toUUID <$> U4.nextRandom
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{- Generates a UUID from a given string, using a namespace.
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- Given the same namespace, the same string will always result
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- in the same UUID. -}
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genUUIDInNameSpace :: U.UUID -> String -> UUID
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genUUIDInNameSpace namespace = toUUID . U5.generateNamed namespace . s2w8
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{- Namespace used for UUIDs derived from git-remote-gcrypt ids. -}
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gCryptNameSpace :: U.UUID
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gCryptNameSpace = U5.generateNamed U5.namespaceURL $
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s2w8 "http://git-annex.branchable.com/design/gcrypt/"
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{- Get current repository's UUID. -}
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getUUID :: Annex UUID
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getUUID = annexUUID <$> Annex.getGitConfig
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{- Looks up a remote repo's UUID, caching it in .git/config if
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- it's not already. -}
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getRepoUUID :: Git.Repo -> Annex UUID
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getRepoUUID r = do
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c <- toUUID <$> getConfig cachekey ""
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let u = getUncachedUUID r
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if c /= u && u /= NoUUID
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then do
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updatecache u
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return u
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else return c
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where
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updatecache u = do
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g <- gitRepo
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when (g /= r) $ storeUUIDIn cachekey u
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cachekey = remoteAnnexConfig r "uuid"
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removeRepoUUID :: Annex ()
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removeRepoUUID = do
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unsetConfig configkeyUUID
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storeUUID NoUUID
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getUncachedUUID :: Git.Repo -> UUID
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getUncachedUUID = toUUID . Git.Config.get configkeyUUID ""
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-- Does the repo's config have a key for the UUID?
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-- True even when the key has no value.
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isUUIDConfigured :: Git.Repo -> Bool
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isUUIDConfigured = isJust . Git.Config.getMaybe configkeyUUID
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{- Make sure that the repo has an annex.uuid setting. -}
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prepUUID :: Annex ()
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prepUUID = whenM ((==) NoUUID <$> getUUID) $
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storeUUID =<< liftIO genUUID
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storeUUID :: UUID -> Annex ()
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storeUUID = storeUUIDIn configkeyUUID
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storeUUIDIn :: ConfigKey -> UUID -> Annex ()
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storeUUIDIn configfield = setConfig configfield . fromUUID
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{- Only sets the configkey in the Repo; does not change .git/config -}
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setUUID :: Git.Repo -> UUID -> IO Git.Repo
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setUUID r u = do
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let s = encodeBS $ show configkeyUUID ++ "=" ++ fromUUID u
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Git.Config.store s Git.Config.ConfigList r
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-- Dummy uuid for the whole web. Do not alter.
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webUUID :: UUID
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webUUID = UUID (fromString "00000000-0000-0000-0000-000000000001")
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-- Dummy uuid for bittorrent. Do not alter.
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bitTorrentUUID :: UUID
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bitTorrentUUID = UUID (fromString "00000000-0000-0000-0000-000000000002")
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