os/docker/env.go

package docker

import (
	"fmt"
	"strings"

	"github.com/docker/libcompose/project"
	"github.com/rancherio/os/config"
)

type ConfigEnvironment struct {
	cfg *config.CloudConfig
}

func NewConfigEnvironment(cfg *config.CloudConfig) *ConfigEnvironment {
	return &ConfigEnvironment{
		cfg: cfg,
	}
}

func appendEnv(array []string, key, value string) []string {
	parts := strings.SplitN(key, "/", 2)
	if len(parts) == 2 {
		key = parts[1]
	}

	return append(array, fmt.Sprintf("%s=%s", key, value))
}

func lookupKeys(cfg *config.CloudConfig, keys ...string) []string {
	for _, key := range keys {
		if strings.HasSuffix(key, "*") {
			result := []string{}
			for envKey, envValue := range cfg.Rancher.Environment {
				keyPrefix := key[:len(key)-1]
				if strings.HasPrefix(envKey, keyPrefix) {
					result = appendEnv(result, envKey, envValue)
				}
			}

			if len(result) > 0 {
				return result
			}
		} else if value, ok := cfg.Rancher.Environment[key]; ok {
			return appendEnv([]string{}, key, value)
		}
	}

	return []string{}
}

func (c *ConfigEnvironment) Lookup(key, serviceName string, serviceConfig *project.ServiceConfig) []string {
	fullKey := fmt.Sprintf("%s/%s", serviceName, key)
	return lookupKeys(c.cfg, fullKey, key)
}