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Avoid unncessary write to the location log when a file is unlocked and then added back with unchanged content.

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Implemented with no additional overhead of compares etc.

This is safe to do for presence logs because of their locality of change;
a given repo's presence logs are only ever changed in that repo, or in a
repo that has just been actively changing the content of that repo.

So, we don't need to worry about a split-brain situation where there'd
be disagreement about the location of a key in a repo. And so, it's ok to
not update the timestamp when that's the only change that would be made
due to logging presence info.
This commit is contained in:
Joey Hess 2015-10-12 14:46:28 -04:00
parent 82ba8c9a6a
commit f9adb905fc
Failed to extract signature
7 changed files with 65 additions and 14 deletions
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Logs/Location.hs
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@ -48,7 +48,7 @@ logChange = logChange' logNow
logChange' :: (LogStatus -> String -> Annex LogLine) -> Key -> UUID -> LogStatus -> Annex ()
logChange' mklog key (UUID u) s = do
config <- Annex.getGitConfig
addLog (locationLogFile config key) =<< mklog s u
maybeAddLog (locationLogFile config key) =<< mklog s u
logChange' _ _ NoUUID _ = noop
{- Returns a list of repository UUIDs that, according to the log, have