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Not much available time today, only a few hours.
Main thing I did was fixed up the failed push tracking to use a better data
structure. No need for a queue of failed pushes, all it needs is a map of
remotes that have an outstanding failed push, and a timestamp. Now it
won't grow in memory use forever anymore. :)
Finding the right thread mutex type for this turned out to be a bit of a
challenge. I ended up with a STM TMVar, which is left empty when there are
no pushes to retry, so the thread using it blocks until there are some. And,
it can be updated transactionally, without races.
I also fixed a bug outside the git-annex assistant code. It was possible to
crash git-annex if a local git repository was configured as a remote, and
the repository was not available on startup. git-annex now ignores such
remotes. This does impact the assistant, since it is a long running process
and git repositories will come and go. Now it ignores any that
were not available when it started up. This will need to be dealt with when
making it support removable drives.
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