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It's possible for data to accumulate in the annex that no files in any
branch point to anymore. One way it can happen is if you `git rm` a file
without first calling `git annex drop`. And, when you modify an annexed
file, the old content of the file remains in the annex. Another way is when
migrating between key-value [[backends]].
This might be historical data you want to preserve, so git-annex defaults to
preserving it. So from time to time, you may want to check for such data and
eliminate it to save space.
# git annex unused
unused . (checking for unused data...)
Some annexed data is no longer used by any files in the repository.
NUMBER KEY
1 SHA256-s86050597--6ae2688bc533437766a48aa19f2c06be14d1bab9c70b468af445d4f07b65f41e
2 SHA1-s14--f1358ec1873d57350e3dc62054dc232bc93c2bd1
(To see where data was previously used, try: git log --stat -S'KEY')
(To remove unwanted data: git-annex dropunused NUMBER)
ok
After running `git annex unused`, you can follow the instructions to examine
the history of files that used the data, and if you decide you don't need that
data anymore, you can easily remove it:
# git annex dropunused 1
dropunused 1 ok
Hint: To drop a lot of unused data, use a command like this:
# git annex dropunused `seq 1 1000`
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