cabal rebuilds the world inside nix develop

[locallycompact]

The nix build works fine, but

nix develop
cabal build all

results in cabal rebuilding libraries that should already be supplied by the shell

In order, the following will be built (use -v for more details):
 - cardano-data-1.1.0.0 (lib:testlib) (requires download & build)
 - hspec-discover-2.11.4 (lib) (requires download & build)
 - hydra-prelude-0.12.0 (lib) (cannot read state cache)
 - ouroboros-consensus-0.9.0.0 (lib) (requires download & build)
 - plutus-ledger-api-1.7.0.1 (lib) (requires download & build)
 - hspec-discover-2.11.4 (exe:hspec-discover) (requires download & build)
 - ouroboros-consensus-diffusion-0.7.0.0 (lib) (requires download & build)
 - plutus-ledger-api-1.7.0.1 (lib:plutus-ledger-api-testlib) (requires download & build)
 - cardano-ledger-binary-1.1.1.1 (lib) (requires download & build)
 - cardano-ledger-binary-1.1.1.1 (lib:testlib) (requires download & build)
 - cardano-data-1.1.0.0 (lib) (requires download & build)
 - cardano-crypto-wrapper-1.5.1.0 (lib) (requires download & build)
 - small-steps-test-1.0.0.1 (lib) (requires download & build)
 - set-algebra-1.1.0.1 (lib) (requires download & build)
 - cardano-ledger-byron-1.0.0.2 (lib) (requires download & build)
 - cardano-crypto-test-1.5.0.0 (lib) (requires download & build)
 - byron-spec-ledger-1.0.0.1 (lib) (requires download & build)
 - cardano-ledger-core-1.4.1.0 (lib) (requires download & build)
 - byron-spec-chain-1.0.0.1 (lib) (requires download & build)
 - cardano-ledger-shelley-1.4.2.0 (lib) (requires download & build)
 - cardano-ledger-byron-test-1.5.0.0 (lib) (requires download & build)
 - cardano-ledger-allegra-1.2.1.0 (lib) (requires download & build)
 - cardano-ledger-core-1.4.1.0 (lib:testlib) (requires download & build)
 - cardano-ledger-mary-1.3.1.0 (lib) (requires download & build)
 - cardano-ledger-shelley-1.4.2.0 (lib:testlib) (requires download & build)
 - cardano-ledger-alonzo-1.3.3.0 (lib) (requires download & build)
 - cardano-ledger-allegra-1.2.1.0 (lib:testlib) (requires download & build)
 - cardano-ledger-babbage-1.4.2.0 (lib) (requires download & build)
 - cardano-ledger-mary-1.3.1.0 (lib:testlib) (requires download & build)
 - cardano-ledger-conway-1.6.3.0 (lib) (requires download & build)
 - cardano-ledger-alonzo-1.3.3.0 (lib:testlib) (requires download & build)
 - cardano-protocol-tpraos-1.0.3.3 (lib) (requires download & build)
 - cardano-ledger-api-1.3.1.0 (lib) (requires download & build)
 - cardano-ledger-babbage-1.4.2.0 (lib:testlib) (requires download & build)
 - ouroboros-consensus-protocol-0.5.0.4 (lib) (requires download & build)
 - ouroboros-consensus-cardano-0.7.0.0 (lib) (requires download & build)
 - cardano-api-8.11.0.0 (lib:internal) (requires download & build)

[ffakenz]

after exploration we found 2 potential alternatives:

• either derive the plan from stack.yaml via haskell.nix
• or use horizon

both are time consuming tasks.

although, we don't think the stack alternative is not really worth it, so we might give horizon a try.

keep in mind horizon brings a massive architecture change.

Note: Link to #nix-channel thread

[locallycompact]

This is a public sublibrary problem:

https://github.com/input-output-hk/haskell.nix/issues/1662

https://github.com/haskell/cabal/issues/6039

There is no current workaround, you have to compile the things locally again with Cabal.