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[[!comment format=mdwn
username="http://joeyh.name/"
ip="209.250.56.102"
subject="moreinfo"
date="2014-03-19T20:49:47Z"
content="""
What I don't understand about this is, how does `open` fail due to a file being locked? This is Linux, it doesn't have mandatory locking that I know of, and git-annex certianly doesn't use such a thing.
I really need a way to reproduce this and/or a strace. As it is, I've never seen this reported by anyone else and don't understand the failure mode at all.
The relevant part of the code seems to be here:
[[!format haskell \"\"\"
setJournalFile :: JournalLocked -> FilePath -> String -> Annex ()
setJournalFile _jl file content = do
tmp <- fromRepo gitAnnexTmpMiscDir
createAnnexDirectory =<< fromRepo gitAnnexJournalDir
createAnnexDirectory tmp
-- journal file is written atomically
jfile <- fromRepo $ journalFile file
let tmpfile = tmp </> takeFileName jfile
liftIO $ do
writeBinaryFile tmpfile content
moveFile tmpfile jfile
\"\"\"]]
While there is some ctnl locking going on, it locks a special sentinal file, not the file it's writing to.
"""]]
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