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Bump github.com/ipfs/go-datastore from 0.4.2 to 0.4.4

Bump github.com/jbenet/goprocess from 0.1.3 to 0.1.4

feat: put all temporary files in the same directory and clean them up

fix: only log when we find a file we don't expect

Otherwise, if we repeatedly stop the same node, we'll collect a bunch of
temporary files and NEVER DELETE them. This will:

1. Waste space.
2. Slow down queries/GC.

This patch:

1. Moves all temporary files to a single `.temp` directory. The leading `.`
means it can't conflict with any keys and queries (even on older flatfs
versions) will skip it.
2. Adds an "rm -rf flatfs-dir/.temp" call on start.

We _expect_ temporary put- files.

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.4.2 to 0.4.4.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.4.2...v0.4.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/jbenet/goprocess](https://github.com/jbenet/goprocess) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/jbenet/goprocess/releases)
- [Commits](https://github.com/jbenet/goprocess/compare/v0.1.3...v0.1.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump github.com/ipfs/go-log from 1.0.2 to 1.0.3

Bumps [github.com/ipfs/go-log](https://github.com/ipfs/go-log) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/ipfs/go-log/releases)
- [Commits](https://github.com/ipfs/go-log/compare/v1.0.2...v1.0.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Make flatfs robust

It's a no-op if we don't need it.

Only allow keys of the form `/[0-9A-Z+-_=]`. That is, upper-case alphanumeric
keys in the root namespace (plus some special characters).

Why? We don't encode keys before writing them to the filesystem. This change
ensures that:

1. Case sensitivity doesn't matter because we only allow upper-case keys.
2. Path separators and special characters doesn't matter.

For context, go-ipfs only uses flatfs for storing blocks. Every block CID is
encoded as uppercase alphanumeric text (specifically, uppercase base32).

We could be less restrictive, but this is safer and easier to understand.
Unfortunately, we _can't_ allow mixed case (Windows) and can't allow lowercase
because we're already using uppercase keys.

fixes #23

That way, we're finally implementing everything.

While this datastore is still quite limited, we might as well support everything
we easily can.

chore: update go-datastore

And better handle prefixes.

Bump github.com/ipfs/go-datastore from 0.3.0 to 0.3.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.3.0...v0.3.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Update Datastore Interface

query: deny ReturnsSizes and ReturnExpirations instead of returning wrong result

Bump github.com/ipfs/go-datastore from 0.1.0 to 0.1.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.1.0 to 0.1.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.1.0...v0.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

doc: add a lead maintainer

make delete idempotent