traefik/pkg/cli/loader_env.go

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package cli
import (
"fmt"
"os"
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"strings"
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"github.com/containous/traefik/v2/pkg/config/env"
"github.com/containous/traefik/v2/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) {
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vars := env.FindPrefixedEnvVars(os.Environ(), env.DefaultNamePrefix, cmd.Configuration)
if len(vars) == 0 {
return false, nil
}
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if err := env.Decode(vars, env.DefaultNamePrefix, cmd.Configuration); err != nil {
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log.WithoutContext().Debug("environment variables", strings.Join(vars, ", "))
return false, fmt.Errorf("failed to decode configuration from environment variables: %v ", err)
}
log.WithoutContext().Println("Configuration loaded from environment variables.")
return true, nil
}