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implement chunk logs

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Slightly tricky as they are not normal UUIDBased logs, but are instead maps
from (uuid, chunksize) to chunkcount.

This commit was sponsored by Frank Thomas.
This commit is contained in:
Joey Hess 2014-07-24 16:23:36 -04:00
parent bbdb2c04d5
commit e2c44bf656
8 changed files with 134 additions and 39 deletions
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15
doc/design/assistant/chunks.mdwn
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@ -160,17 +160,12 @@ the git-annex branch.
The location log does not record locations of individual chunk keys
(too space-inneficient).
Instead, look at git-annex:aaa/bbb/SHA256-s12345--xxxxxxx.log.cnk to get
the chunk count and size for a key. File format would be:
the chunk count and size for a key.
ts uuid chunksize chunkcount
Where a chunkcount of 0 means that the object is not longer present in the
remote using the specified chunk size.
Note that a given remote uuid might have multiple lines, if a key was
stored on it twice using different chunk sizes. Also note that even when
this file exists for a key, the object may be stored non-chunked on the
remote too.
Note that a given remote uuid might have multiple chunk sizes logged, if a
key was stored on it twice using different chunk sizes. Also note that even
when this file exists for a key, the object may be stored non-chunked on
the remote too.
`hasKey` would check if any one (chunksize, chunkcount) is satisfied by
the files on the remote. It would also check if the non-chunked key is