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added preferred-content log, and allow editing it with vicfg

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This includes a full parser for the boolean expressions in the log,
that compiles them into Matchers. Those matchers are not used yet.

A complication is that matching against an expression should never
crash git-annex with an error. Instead, vicfg checks that the expressions
parse. If a bad expression (or an expression understood by some future
git-annex version) gets into the log, it'll be ignored.

Most of the code in Limit couldn't fail anyway, but I did have to make
limitCopies check its parameter first, and return an error if it's bad,
rather than erroring at runtime.
This commit is contained in:
Joey Hess 2012-10-04 15:48:59 -04:00
parent c809f3d486
commit bc649a35ba
9 changed files with 193 additions and 33 deletions
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Logs/Trust.hs
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@ -46,7 +46,7 @@ trustSet uuid@(UUID _) level = do
changeLog ts uuid level .
parseLog (Just . parseTrustLog)
Annex.changeState $ \s -> s { Annex.trustmap = Nothing }
trustSet NoUUID _ = error "unknown UUID; cannot modify trust level"
trustSet NoUUID _ = error "unknown UUID; cannot modify"
{- Returns the TrustLevel of a given repo UUID. -}
lookupTrust :: UUID -> Annex TrustLevel