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Implementation of a CAS store #3528

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Implementation of a CAS store #3528

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regnat commented Apr 23, 2020

New implementation of NixOS/rfcs#62 (replaces the old prototype from #3262)

Currently at a very early stage:

  • Building a cas derivation locally works
  • Derivations can depend (transitively) on CAS derivations and the cutoff will be correctly done when possible
  • Most tests fail, probably just because the output path returned by most commands isn't the right one anymore
  • Nothing is implemented on the remote {building,caching} side

/cc @edolstra @Ericson2314 @layus

@regnat regnat marked this pull request as draft Apr 23, 2020
@regnat regnat mentioned this pull request Apr 23, 2020
@@ -799,6 +799,9 @@ class DerivationGoal : public Goal
/* Whether this is a fixed-output derivation. */
bool fixedOutput;

/* Whether this is a content adressed derivation */
bool contentAddressed = false;

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Ericson2314 Apr 30, 2020


@regnat Sorry I have not responded to this PR more thoroughly yet.

First thing I wanted to point out is I made #3418 so that we might talk about the various independent-ish aspects of derivations, rather than keeping around multiple bools of which only 1 should be true.

regnat added 16 commits Jun 17, 2020
Not implementing anything here, just throwing an error if a derivation
sets `__contentAddressed = true` without
`--experimental-features content-addressed-paths`
(and also with it as there's nothing implemented yet)
Only works for a local store, and we can't depend on them
Things build − and the output paths are correct, but the paths aren't correctly registred yet
It only returns a really valid value for `LocalFSStore`, but we should extend
the store protocol at some point to make it work for any store, so we might
as well put it here right now − esp. given that it simplifies it usage a lot
If a derivation doesn't depend on a CA derivation (and isn't CA itself), then
make sure that its out path isn't changed
Extend the daemon protocol to give add the `queryOutPath` operation
Inline the build of the CA derivation to make things simpler
@regnat regnat force-pushed the tweag:simple-cas branch from 2238175 to 28cdbf9 Jun 17, 2020
@regnat regnat mentioned this pull request Jun 24, 2020
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