38 lines
1.6 KiB
Markdown
38 lines
1.6 KiB
Markdown
Support Amazon S3 as a file storage backend.
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There's a haskell library that looks good. Not yet in Debian.
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Multiple ways of using S3 are possible. Current plan is to have a S3BUCKET
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backend, that is derived from Backend.File, so it caches files locally and
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can transfer files between systems too, without involving S3.
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get will try to get it from S3 or from a remote. A annex.s3.cost can
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configure the cost of S3 vs the cost of other remotes.
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add will always upload a copy to S3.
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Each file in the S3 bucket is assumed to be in the annex. So unused
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will show files in the bucket that nothing points to, and dropunused remove
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them.
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For numcopies counting, S3 will count as 1 copy (or maybe more?), so if
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numcopies=2, then you don't fully trust S3 and request git-annex assure
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one other copy.
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drop will remove a file locally, but keep it in S3. drop --force *might*
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remove it from S3. TBD.
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annex.s3.bucket would configure the bucket the use. (And an env var or
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something configure the password.) Although the bucket
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would also be encoded in the keys. So, the configured bucket would be used
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when adding new files. A system could move from one bucket to another over
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time while still having legacy files in an earlier one;
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perhaps you move to Europe and want new files to be put in that region.
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And git annex `migrate --backend=S3BUCKET --force` could move files
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between datacenters!
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Problem: Then the only way for unused to know what buckets are in use
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is to see what keys point to them -- but if the last file from a bucket is
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deleted, it would then not be able to say that the files in that bucket are
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all unused. Need cached list of recently seen S3 buckets?
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