ca9c6c5f60
Git has an obnoxious special case in git config, a line "foo" is the same as "foo = true". That means there is no way to examine the output of git config and tell if it was run with --null or not, since a "foo" in the first line could be such a boolean, or could be followed by its value on the next line if --null were used. So, rather than trying to do such a detection, track the style of config at all the points where it's generated.
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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