| Commit message (Collapse) | Author | Age |
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Both the directory and webdav special remotes used to have to buffer
the whole file contents before it could be decrypted, as they read
from chunks. Now the chunks are streamed through gpg with no buffering.
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This commit includes a paydown on technical debt incurred two years ago,
when I didn't know that it was bad to make custom Read and Show instances
for types. As the routes need Read and Show for Transfer, which includes a
Key, and deriving my own Read instance of key was not practical,
I had to finally clean that up.
So the compact Key read and show functions are now file2key and key2file,
and Read and Show are now derived instances.
Changed all code that used the old instances, compiler checked.
(There were a few places, particularly in Command.Unused, and the test
suite where the Show instance continue to be used for legitimate
comparisons; ie show key_x == show key_y (though really in a bloom filter))
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Its truncation behavior is a red flag, so avoid using it in these places
where only raw ByteStrings are used, without looking at the data inside.
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This option avoids gpg key distribution, at the expense of flexability, and
with the requirement that all clones of the git repository be equally
trusted.
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Avoid ever using read to parse a non-haskell formatted input string.
show :: Key is arguably still show abuse, but displaying Keys as filenames
is just too useful to give up.
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no code changes
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Actually, let's do a targeted fix of the actual forkProcess that was not
waited on. The global reap is moved back to the end, after the long-running
git processes actually exit.
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Did all sources except Remotes/* and Command/*
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encrypted, in .git-annex/remotes.log, so environment variables need not be set after the remote is initialized.
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This reverts commit 892593c5efacbc084d19af4b5d7164ededaea7ff.
Conflicts:
Crypto.hs
debian/control
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Since hS3 needs Crypto anyway, this actually reduces dependencies.
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This was a most surprising leak. It occurred in the process that is forked
off to feed data to gpg. That process was passed a lazy ByteString of
input, and ghc seemed to not GC the ByteString as it was lazily read
and consumed, so memory slowly leaked as the file was read and passed
through gpg to bup.
To fix it, I simply changed the feeder to take an IO action that returns
the lazy bytestring, and fed the result directly to hPut.
AFAICS, this should change nothing WRT buffering. But somehow it makes
ghc's GC do the right thing. Probably I triggered some weakness in ghc's
GC (version 6.12.1).
(Note that S3 still has this leak, and others too. Fixing it will involve
another dance with the type system.)
Update: One theory I have is that this has something to do with
the forking of the feeder process. Perhaps, when the ByteString
is produced before the fork, ghc decides it need to hold a pointer
to the start of it, for some reason -- maybe it doesn't realize that
it is only used in the forked process.
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Stalls were caused by code that did approximatly:
content' <- liftIO $ withEncryptedContent cipher content return
store content'
The return evaluated without actually reading content from S3,
and so the cleanup code began waiting on gpg to exit before
gpg could send all its data.
Fixing it involved moving the `store` type action into the IO monad:
liftIO $ withEncryptedContent cipher content store
Which was a bit of a pain to do, thank you type system, but
avoids the problem as now the whole content is consumed, and
stored, before cleanup.
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no agent.
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I was offline last night and going by function signatures, and unable to
tell which was which. Note sure it matters to HMAC which comes first;
better safe than sorry.
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Per bugs/S3_bucket_uses_the_same_key_for_encryption_and_hashing
It may be paranoid to worry about the cipher being recovered
from hmac keys, but yes.. let's be paranoid.
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Forking a new process rather than relying on a thread to feed gpg.
The feeder thread was stalling, probably when the main thread got
to the point it was wait()ing on the gpg to exit.
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For HMAC, using the Data.Digest.Pure.SHA library. I have been avoiding
this library for checksumming generally, since it's (probably) not
as fast as external utilities, but it's fine to use it for HMAC.
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Piping data through gpg with symmetric cipher is working.
Only Key encryption is not done.
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Encrypted remotes don't yet encrypt data, but git annex initremote can
be used to generate a cipher and add additional gpg keys that can use it.
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guilhem
Joey Hess