import dependency errors

[0xNineteen]

Description

trying to import lighthouse deps into another rust project leads to failed version requirements.

eg, trying to add the lighthouse_network crate using cargo add --path ../lighthouse/beacon_node/lighthouse_network leads to the error: error: failed to select a version for the requirement eth2_ssz = "^0.4.1" bc the crates link only goes up to 0.4.0.

note: this isnt a problem when building the project because eth2_ssz = "^0.4.1" is defined locally in consensus/ssz/Cargo.toml

~ cat consensus/ssz/Cargo.toml
[package]
name = "eth2_ssz"
version = "0.4.1"

Version

stable

Steps to resolve

i think changing the eth2_ssz requirements (and other local dependencies which have this same problem) to be path dependent would solve this problem but open to other solns

also happy to to open a PR and fix this myself when i get confirmation this is the right approach to fix - thanks! :)

[michaelsproul]

It's possible to work-around the errors by using a [patch] section in your repo that follows the [patch] section in Lighthouse's top-level Cargo.toml. For examples of this, see these two external repos:

• https://github.com/michaelsproul/dummy_builder/blob/main/Cargo.toml
• https://github.com/michaelsproul/eleel/blob/main/Cargo.toml

Long-term, our aim is to remove the [patch] section entirely by publishing our utility crates to crates.io. This will make it easier to use crates from Lighthouse (no more patch section) and the published crates can be used independently. You could even do this now if you are only interested in e.g. ssz or tree_hash. See this PR: #3890

[0xNineteen]

ah ok thanks!