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Optimises query commands that do not. More importantly, avoids any ssh
connection cleanup delay causing problems at the end of such commands.
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This guarantees that stopping an existing socket never fails.
This might be the route out of the mess of needing to worry about socket
lengths in general. However, it would need quite a lot of refactoring
to make every place in git-annex that runs ssh run it with a cwd that was
determined by the location of its connection caching socket. If this
wasn't already such a mess, I'd consider even the thought of that API a bad
idea..
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The control socket path passed to ssh needs to be 17 characters shorter
than the maximum unix domain socket length, because ssh appends stuff to it
to make a temporary filename. Closes: #725512
Also, take the shorter of the relative and the absolute paths to the
socket. Typically the relative path will be a lot shorter (unless
deep inside a subdirectory of the repository), and so using it will
avoid flirting with the maximum safe socket lenghts in more situations,
and so lead to less breakage if all my attempts at fixing this are
still buggy.
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test suite still passes
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The latter is harder for me to remember, but avoids build failures in code
used by the configure program.
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for ssh connection caching.
This is ok to do now that the socket filename never needs to be mapped back
to a hostname.
Short hostnames will still appear in the clear, which is less obfuscated.
So this cannot possibly make ssh connection caching fail for a hostname it
used to work for.
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Turns out that with -O stop -S socketfile, ssh does not need the real
hostname, or port to be specificed. This is because it simply talks to the
ssh behind the socket and tells it to stop. So, can eliminate the
conversion back from a socketfile to host and port. Which will allow using
shorter filenames for sockets in the future.
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Yeah, that didn't actually work. Got error messages like it couldn't read
from the control socket, so probably ssh doesn't really support that on
Windows, at least the cygwin ssh build I'm using.
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Turns out the socket stuff just works on windows.
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That's needed in files used to build the configure program.
For the other files, I'm keeping my __WINDOWS__ define, as I find that much easier to type.
I may search and replace it to use the mingw32_HOST_OS thing later.
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Introduced a new per-remote option 'annex-rsync-transport' to specify
the remote shell that it to be used with rsync. In case the value is
'ssh', connections are cached unless 'sshcaching' is unset.
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undesired things with it.
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Before it was too long to be used.
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Still a couple of places that use git config ad-hoc, but this is most of it
done.
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Now there's a Config type, that's extracted from the git config at startup.
Note that laziness means that individual config values are only looked up
and parsed on demand, and so we get implicit memoization for all of them.
So this is not only prettier and more type safe, it optimises several
places that didn't have explicit memoization before. As well as getting rid
of the ugly explicit memoization code.
Not yet done for annex.<remote>.* configuration settings.
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a key's presence.
Also, use the new withQuietOutput function to avoid running the shell to
/dev/null stderr in two other places.
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The standalone build does not bundle its own ssh, so should be built
to support as wide an array of ssh versions as possible, so turn off
connection caching.
Unfortunatly, as implemented this forces a full rebuild when building the
standalone binary, and of course it makes it somewhat slower.
This is not ideal, but neither is probing the ssh version every time it's
run (slow), or once when initializing a repo (fragile).
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too long (and use relative path to minimise path to the control socket).
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Baked into the code was an assumption that a repository's git directory
could be determined by adding ".git" to its work tree (or nothing for bare
repos). That fails when core.worktree, or GIT_DIR and GIT_WORK_TREE are
used to separate the two.
This was attacked at the type level, by storing the gitdir and worktree
separately, so Nothing for the worktree means a bare repo.
A complication arose because we don't learn where a repository is bare
until its configuration is read. So another Location type handles
repositories that have not had their config read yet. I am not entirely
happy with this being a Location type, rather than representing them
entirely separate from the Git type. The new code is not worse than the
old, but better types could enforce more safety.
Added support for core.worktree. Overriding it with -c isn't supported
because it's not really clear what to do if a git repo's config is read, is
not bare, and is then overridden to bare. What is the right git directory
in this case? I will worry about this if/when someone has a use case for
overriding core.worktree with -c. (See Git.Config.updateLocation)
Also removed and renamed some functions like gitDir and workTree that
misused git's terminology.
One minor regression is known: git annex add in a bare repository does not
print a nice error message, but runs git ls-files in a way that fails
earlier with a less nice error message. This is because before --work-tree
was always passed to git commands, even in a bare repo, while now it's not.
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annex.ssh-options, annex.rsync-options, annex.bup-split-options.
And adjust types to avoid the bugs that broke several config settings
recently. Now "annex." prefixing is enforced at the type level.
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void :: Functor f => f a -> f () -- ah, of course that's useful :)
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Lock files, directories, etc.
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no behavior changes
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version of ssh and default annex.sshcaching accordingly.
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ghc 7.4 comaplains about use of System.IO.Error to catch exceptions.
Ok, use Control.Exception, with variants specialized to only catch IO
exceptions.
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a stricter (but also partial) readMaybe is getting added to base
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So the user can override them.
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Ssh connection caching is now enabled automatically by git-annex. Only one
ssh connection is made to each host per git-annex run, which can speed some
things up a lot, as well as avoiding repeated password prompts. Concurrent
git-annex processes also share ssh connections. Cached ssh connections are
shut down when git-annex exits.
Note: The rsync special remote does not yet participate in the ssh
connection caching.
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Joey Hess
Joey Hess
guilhem