traefik/pkg/cli/loader_env.go

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package cli
import (
"fmt"
"os"
"strings"
"github.com/containous/traefik/pkg/config/env"
"github.com/containous/traefik/pkg/log"
)
// EnvLoader loads a configuration from all the environment variables prefixed with "TRAEFIK_".
type EnvLoader struct{}
// Load loads the command's configuration from the environment variables.
func (e *EnvLoader) Load(_ []string, cmd *Command) (bool, error) {
return e.load(os.Environ(), cmd)
}
func (*EnvLoader) load(environ []string, cmd *Command) (bool, error) {
var found bool
for _, value := range environ {
if strings.HasPrefix(value, "TRAEFIK_") {
found = true
break
}
}
if !found {
return false, nil
}
if err := env.Decode(environ, cmd.Configuration); err != nil {
return false, fmt.Errorf("failed to decode configuration from environment variables: %v", err)
}
log.WithoutContext().Println("Configuration loaded from environment variables.")
return true, nil
}