Requires checking out the Uniswap Periphery: https://github.com/1Hive/uniswap-v2-periphery

1. Install dependencies in both this repo and the periphery repo:

$ yarn install

2. Copy private key that contains xDAI into this repo and the the periphery repo's truffle-config.js where specified.

3. Update the FEE_TO_SETTER_ADDRESS in the migrations/2_deploy.js file if required.

4. Deploy to xDAI:

$ npx truffle migrate --network xdai

5. Get the init code hash:

$ npx truffle exec scripts/getUniswapV2PairBytecode.js

6. Copy the previously output UniswapV2Factory address to the FACTORY_ADDRESS in the migrations/2_deploy.js file.

7. Update the WRAPPED_ETH address in the migrations/2_deploy.js file if required.

8. Copy the init code hash previously output to contracts/libraries/UniswapV2Library.sol at line 24.

9. Deploy to xDAI:

$ npx truffle migrate --network xdai

Note it seems xdai doesn't currently impose the contract size limit of 24576 bytes so we can enable 10000 optimizer runs making individual transaction executions cheaper. There's a chance xdai will introduce the limit in future in which case the current optimizer runs will need to be reduced. The current size of the UniswapV2Router02 is 26887 bytes.