nimbus-eth2/interop/README.md

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This folder contains scripts for launching the nimbus beacon chain node in a configuration appropriate for [interop](https://github.com/ethereum/eth2.0-pm/tree/master/interop).
## Building
In general, follow the build instructions of `nim-beacon-chain` as documented in the main repo - make sure to set up your build environment with all necessary system libraries as documented there:
```bash
# Clone repo
export GIT_LFS_SKIP_SMUDGE=1 # skip LFS
git clone https://github.com/status-im/nim-beacon-chain.git
cd nim-beacon-chain
make # prepare build system (cloning the correct submodules)
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make update deps # build dependencies
```
## Running
Look in the scripts for options - the default config is a small setup using the `minimal` state spec.
```
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cd interop
# Clear data from previous run, then start a new simulation
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rm -rf data; ./start.sh
# In a separate terminal, can run another beacon node, such as lighthouse:
./run_lighthouse.sh
```
## Diagnostics
```bash
# Nimbus genesis state
less data/state_snapshot.json
# Lighthouse genesis state
curl localhost:5052/beacon/state?slot=0 | python -m json.tool | sed 's/"0x/"/' > /tmp/lighthouse_state.json
# Format nimbus the same
cat data/state_snapshot.json | python -m json.tool | sed 's/"0x/"/' > /tmp/nimbus_state.json
diff -uw /tmp/nimbus_state.json /tmp/lighthouse_state.json
```