Access environment variables in a Go template

main.go

package main

import (
  "os"
  "strings"
)

func main() {
  const tmpl := `
USER={{.USER}}
HOME={{.HOME}}
`

  envMap, _ := envToMap()
  t := template.Must(template.New("tmpl").Parse(tmpl))
  t.Execute(os.Stdout, envMap)
}

func envToMap() (map[string]string, error) {
  envMap := make(map[string]string)
  var err error

  for _, v := range os.Environ() {
    split_v := strings.Split(v, "=")
    envMap[split_v[0]] = split_v[1]
  }

  return envMap, err
}

Actually it might be better to use

	split_v := strings.SplitN(v, "=", 2)

That way you don't have to join the strings later on