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parse X in location log file as indicating a dead key

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A dead key is both not present at the location that thinks it has a copy,
and also is assumed to probably not be present anywhere else. Although
there may be lurking disconnected repos that somehow still have a copy.

Suprisingly few changes needed for this! This is because the presence log
code only really concerns itself with keys that are present, and dead keys
are not present.

Note that both the location and web log can be parsed as having a dead key.
I don't see any value to having keys listed as dead in the web log, but
since it doesn't change any behavior, there was no point in not parsing it.
This commit is contained in:
Joey Hess 2015-06-09 13:28:30 -04:00
parent 15a02d6e90
commit 53ede1a10e
2 changed files with 5 additions and 3 deletions
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4
Logs/Presence/Pure.hs
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@ -20,7 +20,7 @@ data LogLine = LogLine {
info :: String
} deriving (Eq, Show)
data LogStatus = InfoPresent | InfoMissing
data LogStatus = InfoPresent | InfoMissing | InfoDead
deriving (Eq, Show, Bounded, Enum)
{- Parses a log file. Unparseable lines are ignored. -}
@ -38,6 +38,7 @@ parseLog = mapMaybe parseline . lines
parseStatus :: String -> Maybe LogStatus
parseStatus "1" = Just InfoPresent
parseStatus "0" = Just InfoMissing
parseStatus "X" = Just InfoDead
parseStatus _ = Nothing
{- Generates a log file. -}
@ -47,6 +48,7 @@ showLog = unlines . map genline
genline (LogLine d s i) = unwords [show d, genstatus s, i]
genstatus InfoPresent = "1"
genstatus InfoMissing = "0"
genstatus InfoDead = "X"
{- Given a log, returns only the info that is are still in effect. -}
getLog :: String -> [String]

4
doc/internals.mdwn
View file

@ -171,8 +171,8 @@ for file contents. These are placed in two levels of subdirectories
for hashing. See [[hashing]] for details.
The name of the key is the filename, and the content
consists of a timestamp, either 1 (present) or 0 (not present), and
the UUID of the repository that has or lacks the file content.
consists of a timestamp, either 1 (present) or 0 (not present) or X (dead),
and the UUID of the repository that has or lacks the file content.
Example: