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author | 2017-08-14 13:55:38 -0400 | |
---|---|---|
committer | 2017-08-14 14:19:58 -0400 | |
commit | aecfea27593bc121273fe53a6c11d4a22567004f (patch) | |
tree | 25d0b10649fe8da0d5bf5eeeacb9519690035192 /Logs/UUIDBased.hs | |
parent | 0a16e9c3940d075e2cf88df75beeb0e1aaba4f01 (diff) |
Added GIT_ANNEX_VECTOR_CLOCK environment variable
Can be used to override the default timestamps used in log files in the
git-annex branch. This is a dangerous environment variable; use with
caution.
Note that this only affects writing to the logs on the git-annex branch.
It is not used for metadata in git commits (other env vars can be set for
that).
There are many other places where timestamps are still used, that don't
get committed to git, but do touch disk. Including regular timestamps
of files, and timestamps embedded in some files in .git/annex/, including
the last fsck timestamp and timestamps in transfer log files.
A good way to find such things in git-annex is to get for getPOSIXTime and
getCurrentTime, although some of the results are of course false positives
that never hit disk (unless git-annex gets swapped out..)
So this commit does NOT necessarily make git-annex comply with some HIPPA
privacy regulations; it's up to the user to determine if they can use it in
a way compliant with such regulations.
Benchmarking: It takes 0.00114 milliseconds to call getEnv
"GIT_ANNEX_VECTOR_CLOCK" when that env var is not set. So, 100 thousand log
files can be written with an added overhead of only 0.114 seconds. That
should be by far swamped by the actual overhead of writing the log files
and making the commit containing them.
This commit was supported by the NSF-funded DataLad project.
Diffstat (limited to 'Logs/UUIDBased.hs')
-rw-r--r-- | Logs/UUIDBased.hs | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Logs/UUIDBased.hs b/Logs/UUIDBased.hs index 97ecd1011..fd1cd7c2d 100644 --- a/Logs/UUIDBased.hs +++ b/Logs/UUIDBased.hs @@ -17,7 +17,8 @@ module Logs.UUIDBased ( Log, LogEntry(..), - TimeStamp(..), + VectorClock, + currentVectorClock, parseLog, parseLogNew, parseLogWithUUID, @@ -29,10 +30,10 @@ module Logs.UUIDBased ( ) where import qualified Data.Map as M -import Data.Time.Clock.POSIX import Common import Types.UUID +import Annex.VectorClock import Logs.MapLog import Logs.TimeStamp import Logs.Line @@ -42,8 +43,8 @@ type Log v = MapLog UUID v showLog :: (v -> String) -> Log v -> String showLog shower = unlines . map showpair . M.toList where - showpair (k, LogEntry (Date p) v) = - unwords [fromUUID k, shower v, tskey ++ show p] + showpair (k, LogEntry (VectorClock c) v) = + unwords [fromUUID k, shower v, tskey ++ show c] showpair (k, LogEntry Unknown v) = unwords [fromUUID k, shower v] @@ -75,7 +76,7 @@ parseLogWithUUID parser = M.fromListWith best . mapMaybe parse . splitLines | otherwise = drop 1 $ beginning ws pdate s = case parsePOSIXTime s of Nothing -> Unknown - Just d -> Date d + Just d -> VectorClock d showLogNew :: (v -> String) -> Log v -> String showLogNew = showMapLog fromUUID @@ -83,7 +84,7 @@ showLogNew = showMapLog fromUUID parseLogNew :: (String -> Maybe v) -> String -> Log v parseLogNew = parseMapLog (Just . toUUID) -changeLog :: POSIXTime -> UUID -> v -> Log v -> Log v +changeLog :: VectorClock -> UUID -> v -> Log v -> Log v changeLog = changeMapLog addLog :: UUID -> LogEntry v -> Log v -> Log v |