DockerCLI/cli/command/orchestrator.go

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package command
import (
"fmt"
"os"
)
// Orchestrator type acts as an enum describing supported orchestrators.
type Orchestrator string
const (
// OrchestratorKubernetes orchestrator
OrchestratorKubernetes = Orchestrator("kubernetes")
// OrchestratorSwarm orchestrator
OrchestratorSwarm = Orchestrator("swarm")
orchestratorUnset = Orchestrator("unset")
defaultOrchestrator = OrchestratorSwarm
envVarDockerOrchestrator = "DOCKER_ORCHESTRATOR"
)
func normalize(flag string) Orchestrator {
switch flag {
case "kubernetes", "k8s":
return OrchestratorKubernetes
case "swarm", "swarmkit":
return OrchestratorSwarm
default:
return orchestratorUnset
}
}
// GetOrchestrator checks DOCKER_ORCHESTRATOR environment variable and configuration file
// orchestrator value and returns user defined Orchestrator.
func GetOrchestrator(isExperimental bool, flagValue, value string) Orchestrator {
// Non experimental CLI has kubernetes disabled
if !isExperimental {
return defaultOrchestrator
}
// Check flag
if o := normalize(flagValue); o != orchestratorUnset {
return o
}
// Check environment variable
env := os.Getenv(envVarDockerOrchestrator)
if o := normalize(env); o != orchestratorUnset {
return o
}
// Check specified orchestrator
if o := normalize(value); o != orchestratorUnset {
return o
}
if value != "" {
fmt.Fprintf(os.Stderr, "Specified orchestrator %q is invalid. Please use either kubernetes or swarm\n", value)
}
// Nothing set, use default orchestrator
return defaultOrchestrator
}