Database

[sorki]

PoC of database compatible with Nix ones at /nix/var/nix/db/db.sqlite (schema version 10).

Allows us to test roundtrips of content addressable addresses and store paths using systems db.

• read only operations implemented
• can't create indexes
• ValidPath type is the same as the one in -core, glue conversion code is missing.

Test with

nix-shell
cabal run hnix-store-db

# In repl
> test
> bench

This runs queries vs your local database (owned by root so it's safe to play with this), for me currently results in

*** Exception: PersistMarshalError "*** Exception: ("string","fixed:sha512:2dc6n9ggmbjq8z6ahkcs3bk6yb4z7c56b19fyrnzw9a2ykpjsbllcvpc0cnb279h8s9pl42l6by709bsjg9g7v527k5j29zppamf73b")

because we don't have base64 yet.

cc @layus

[sorki]

Last two commits add base64 support and SHA512 seems to be handled correctly now.

[layus]

Nice job :-) Will try to have a look at it in the near future

[domenkozar]

https://github.com/cachix/cachix/blob/master/cachix/src/Cachix/Client/Store.hs#L42 how to properly call sqlite.db across the platforms.

[layus]

That's a lot of fixups ! ;-).
Do you need me to test it ?

[sorki]

That's a lot of fixups ! ;-). Do you need me to test it ?

Ohai! Soon! It needs #231 (that's why it is so big) and couple more type annotations / transfomers :(( but it works well (at least on GHC947 hehe)

[sorki]

https://github.com/cachix/cachix/blob/master/cachix/src/Cachix/Client/Store.hs#L42 how to properly call sqlite.db across the platforms.

The link is dead but I've checked the history - all that's required is file: prefix? I've added that as it seems better to have it explicit.

[sorki]

That's a lot of fixups ! ;-). Do you need me to test it ?

Ok, yes! Should be good now.