Replaces ip address in hosts file with the WSL2 container's ip

wsl2-replace-ip-in-hosts.ts

import * as shelljs from 'shelljs';
import * as fs from 'fs';

let modifyHosts = ['somehost.tld', 'testing.localdev'];
(shelljs.exec(`ip addr | grep "scope global eth0"`, {async: true}).stdout as any).on('data', (data) => {
  if (data.includes('scope global eth0')) {
    let ip = data.replace('inet ', '').split('/')[0].trim();
    let hosts = fs.readFileSync("/mnt/c/Windows/System32/drivers/etc/hosts", {encoding: 'utf-8'})
      .split('\n');
    
    fs.writeFileSync("/mnt/c/Windows/System32/drivers/etc/hosts", hosts.map(line => {
      if (!line.includes('#') && line.includes('\t')) {
        let parsed = line.split('\t');
        let parsedHost = parsed[1].replace('\r', '');
        
        if (modifyHosts.find(h => h === parsedHost)) {
          return ip + '\t' + parsedHost + '\r';
        }
      }
      return line;
    }).join('\n'), {encoding: 'utf-8'});
  }
});