* git-annex now behaves as git-annex-shell if symlinked to and run by that
name. The Makefile sets this up, saving some 8 mb of installed size.
* git-union-merge is a demo program, so it is no longer built by default.
openSUSE patches rsync with a patch adding SIP protocol support.
https://gist.github.com/2026167
With this patch, running rsync with no hostname parameter is apparently
supposed to list SIP hosts on the network. Practically, it does nothing
and exits 0.
git-annex uses rsync in a very special way to allow git-annex-shell to be
run on the remote host, and so did not need to specify a hostname, or a
file to transfer as a rsync parameter. So it sent ":", a degenerate case of
"host:file".
But the patch cannot differentiate ":" with no host parameter
(a bug in the SIP patch surely).
Results were that getting files failed, as rsync seemed to succeed, but the
requested file failed to arrive. Also I think that sending files will
make git-annex think a file has been transferred to the remote when
really rsync does nothing.
The workaround for this buggy rsync patch is to use "dummy:" as the
hostname.
Add tuning, docs, etc.
Not sure if status is the right place to remote size.. perhaps unused
should report the size and also warn if it sees more keys than the bloom
filter allows?
Can't trust the key size to be accurate for tmp and bad keys, so check
actual file size. In the wild I saw the old code be wrong by a factor
of about 100!
If all tmp/bad keys are empty, they're not shown in status at all.
Showing 0 bytes and suggesting to clean it up seemed weird..
Stale and bad files are rare, so it's more efficient to use inAnnex to see
if they can be deleted, rather than keeping the list of all present keys
around for them.
.. Allowing it to be used by things in constant space!
Random statistics: git annex status has gone from taking 239 mb
of memory and 26 seconds in a repo, to 8 mb and 13 seconds.
The trick here is the unsafeInterleaveIO, and the form of the function's
recursion, which I cribbed heavily from System.IO.HVFS.Utils.recurseDirStat.
The difference is, this one goes to a limited depth and avoids statting
everything.
Before, it leaked space due to caching lists of keys. Now all necessary
data about keys is calculated as they stream in.
The "nearly constant" is due to getKeysPresent, which builds up a lot
of [] thunks as it traverses .git/annex/objects/. Will deal with it later.
Much of the memory bloat turned out to be due to getKeysReferenced
containing a mapM, which is strict and buffered the whole list
rather than streaming it.
The other half of the bloat was due to building a temporary Set
in order to call S.difference. While that is more cpu efficient,
I switched to successive S.delete, since with it, I can run a whole
git annex unused in less than 8 mb of memory.
The whole Set of keys with content available is still stored in memory,
so running unused in a repo with a whole lot of file content will still
use more memory. In a repo containing 6000 files, it needed 40 mb.
Note that the status command still uses the bloatful getKeysReferenced.
This has two benefits.
1. When a lot of refs are going to be received, get them via lower cost
connection when possible.
2. Allows ctrl-c of sync after the cheaper remotes have been pulled from
(or pushed to).
