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cache: Add more documentation
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@ -19,8 +19,18 @@ a lower version number is found the cache is recreated with the current
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version. If a higher version number is found the cache is ignored and left as
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version. If a higher version number is found the cache is ignored and left as
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is.
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is.
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Snapshots and Indexes
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Snapshots, Data and Indexes
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---------------------
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---------------------------
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Snapshot, Data and Index files are cached in the sub-directories ``snapshots``,
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Snapshot, Data and Index files are cached in the sub-directories ``snapshots``,
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``data`` and ``index``, as read from the repository.
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``data`` and ``index``, as read from the repository.
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Expiry
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------
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Whenever a cache directory for a repo is used, that directory's modification
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timestamp is updated to the current time. By looking at the modification
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timestamps of the repo cache directories it is easy to decide which directories
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are old and haven't been used in a long time. Those are probably stale and can
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be removed.
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@ -280,3 +280,10 @@ entirely. In this case, all data is loaded from the repo.
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The cache is ephemeral: When a file cannot be read from the cache, it is loaded
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The cache is ephemeral: When a file cannot be read from the cache, it is loaded
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from the repository.
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from the repository.
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Within the cache directory, there's a sub directory for each repository the
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cache was used with. Restic updates the timestamps of a repo directory each
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time it is used, so by looking at the timestamps of the sub directories of the
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cache directory it can decide which sub directories are old and probably not
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needed any more. You can either remove these directories manually, or run a
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restic command with the ``--cleanup-cache`` flag.
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