func environmentConfig()

in agent/config/config.go [509:596]
83 lines of code
2 McCabe index (conditional complexity)

func environmentConfig() (Config, error) {
	dataDir := os.Getenv("ECS_DATADIR")

	steadyStateRate, burstRate := parseTaskMetadataThrottles()

	var errs []error
	instanceAttributes, errs := parseInstanceAttributes(errs)

	containerInstanceTags, errs := parseContainerInstanceTags(errs)

	additionalLocalRoutes, errs := parseAdditionalLocalRoutes(errs)

	var err error
	if len(errs) > 0 {
		err = apierrors.NewMultiError(errs...)
	}
	return Config{
		Cluster:                             os.Getenv("ECS_CLUSTER"),
		APIEndpoint:                         os.Getenv("ECS_BACKEND_HOST"),
		AWSRegion:                           os.Getenv("AWS_DEFAULT_REGION"),
		DockerEndpoint:                      os.Getenv("DOCKER_HOST"),
		ReservedPorts:                       parseReservedPorts("ECS_RESERVED_PORTS"),
		ReservedPortsUDP:                    parseReservedPorts("ECS_RESERVED_PORTS_UDP"),
		DataDir:                             dataDir,
		Checkpoint:                          parseCheckpoint(dataDir),
		EngineAuthType:                      os.Getenv("ECS_ENGINE_AUTH_TYPE"),
		EngineAuthData:                      NewSensitiveRawMessage([]byte(os.Getenv("ECS_ENGINE_AUTH_DATA"))),
		UpdatesEnabled:                      parseBooleanDefaultFalseConfig("ECS_UPDATES_ENABLED"),
		UpdateDownloadDir:                   os.Getenv("ECS_UPDATE_DOWNLOAD_DIR"),
		DisableMetrics:                      parseBooleanDefaultFalseConfig("ECS_DISABLE_METRICS"),
		ReservedMemory:                      parseEnvVariableUint16("ECS_RESERVED_MEMORY"),
		AvailableLoggingDrivers:             parseAvailableLoggingDrivers(),
		PrivilegedDisabled:                  parseBooleanDefaultFalseConfig("ECS_DISABLE_PRIVILEGED"),
		SELinuxCapable:                      parseBooleanDefaultFalseConfig("ECS_SELINUX_CAPABLE"),
		AppArmorCapable:                     parseBooleanDefaultFalseConfig("ECS_APPARMOR_CAPABLE"),
		TaskCleanupWaitDuration:             parseEnvVariableDuration("ECS_ENGINE_TASK_CLEANUP_WAIT_DURATION"),
		TaskCleanupWaitDurationJitter:       parseEnvVariableDuration("ECS_ENGINE_TASK_CLEANUP_WAIT_DURATION_JITTER"),
		TaskENIEnabled:                      parseBooleanDefaultFalseConfig("ECS_ENABLE_TASK_ENI"),
		TaskIAMRoleEnabled:                  parseBooleanDefaultFalseConfig("ECS_ENABLE_TASK_IAM_ROLE"),
		DeleteNonECSImagesEnabled:           parseBooleanDefaultFalseConfig("ECS_ENABLE_UNTRACKED_IMAGE_CLEANUP"),
		TaskCPUMemLimit:                     parseBooleanDefaultTrueConfig("ECS_ENABLE_TASK_CPU_MEM_LIMIT"),
		DockerStopTimeout:                   parseDockerStopTimeout(),
		ContainerStartTimeout:               parseContainerStartTimeout(),
		ContainerCreateTimeout:              parseContainerCreateTimeout(),
		DependentContainersPullUpfront:      parseBooleanDefaultFalseConfig("ECS_PULL_DEPENDENT_CONTAINERS_UPFRONT"),
		ImagePullInactivityTimeout:          parseImagePullInactivityTimeout(),
		ImagePullTimeout:                    parseEnvVariableDuration("ECS_IMAGE_PULL_TIMEOUT"),
		CredentialsAuditLogFile:             os.Getenv("ECS_AUDIT_LOGFILE"),
		CredentialsAuditLogDisabled:         utils.ParseBool(os.Getenv("ECS_AUDIT_LOGFILE_DISABLED"), false),
		TaskIAMRoleEnabledForNetworkHost:    utils.ParseBool(os.Getenv("ECS_ENABLE_TASK_IAM_ROLE_NETWORK_HOST"), false),
		ImageCleanupDisabled:                parseBooleanDefaultFalseConfig("ECS_DISABLE_IMAGE_CLEANUP"),
		MinimumImageDeletionAge:             parseEnvVariableDuration("ECS_IMAGE_MINIMUM_CLEANUP_AGE"),
		NonECSMinimumImageDeletionAge:       parseEnvVariableDuration("NON_ECS_IMAGE_MINIMUM_CLEANUP_AGE"),
		ImageCleanupInterval:                parseEnvVariableDuration("ECS_IMAGE_CLEANUP_INTERVAL"),
		NumImagesToDeletePerCycle:           parseNumImagesToDeletePerCycle(),
		NumNonECSContainersToDeletePerCycle: parseNumNonECSContainersToDeletePerCycle(),
		ImagePullBehavior:                   parseImagePullBehavior(),
		ImageCleanupExclusionList:           parseImageCleanupExclusionList("ECS_EXCLUDE_UNTRACKED_IMAGE"),
		InstanceAttributes:                  instanceAttributes,
		CNIPluginsPath:                      os.Getenv("ECS_CNI_PLUGINS_PATH"),
		AWSVPCBlockInstanceMetdata:          parseBooleanDefaultFalseConfig("ECS_AWSVPC_BLOCK_IMDS"),
		AWSVPCAdditionalLocalRoutes:         additionalLocalRoutes,
		ContainerMetadataEnabled:            parseBooleanDefaultFalseConfig("ECS_ENABLE_CONTAINER_METADATA"),
		DataDirOnHost:                       os.Getenv("ECS_HOST_DATA_DIR"),
		OverrideAWSLogsExecutionRole:        parseBooleanDefaultFalseConfig("ECS_ENABLE_AWSLOGS_EXECUTIONROLE_OVERRIDE"),
		CgroupPath:                          os.Getenv("ECS_CGROUP_PATH"),
		TaskMetadataSteadyStateRate:         steadyStateRate,
		TaskMetadataBurstRate:               burstRate,
		SharedVolumeMatchFullConfig:         parseBooleanDefaultFalseConfig("ECS_SHARED_VOLUME_MATCH_FULL_CONFIG"),
		ContainerInstanceTags:               containerInstanceTags,
		ContainerInstancePropagateTagsFrom:  parseContainerInstancePropagateTagsFrom(),
		PollMetrics:                         parseBooleanDefaultFalseConfig("ECS_POLL_METRICS"),
		PollingMetricsWaitDuration:          parseEnvVariableDuration("ECS_POLLING_METRICS_WAIT_DURATION"),
		DisableDockerHealthCheck:            parseBooleanDefaultFalseConfig("ECS_DISABLE_DOCKER_HEALTH_CHECK"),
		GPUSupportEnabled:                   utils.ParseBool(os.Getenv("ECS_ENABLE_GPU_SUPPORT"), false),
		InferentiaSupportEnabled:            utils.ParseBool(os.Getenv("ECS_ENABLE_INF_SUPPORT"), false),
		NvidiaRuntime:                       os.Getenv("ECS_NVIDIA_RUNTIME"),
		TaskMetadataAZDisabled:              utils.ParseBool(os.Getenv("ECS_DISABLE_TASK_METADATA_AZ"), false),
		CgroupCPUPeriod:                     parseCgroupCPUPeriod(),
		SpotInstanceDrainingEnabled:         parseBooleanDefaultFalseConfig("ECS_ENABLE_SPOT_INSTANCE_DRAINING"),
		GMSACapable:                         parseGMSACapability(),
		VolumePluginCapabilities:            parseVolumePluginCapabilities(),
		FSxWindowsFileServerCapable:         parseFSxWindowsFileServerCapability(),
		External:                            parseBooleanDefaultFalseConfig("ECS_EXTERNAL"),
		EnableRuntimeStats:                  parseBooleanDefaultFalseConfig("ECS_ENABLE_RUNTIME_STATS"),
		ShouldExcludeIPv6PortBinding:        parseBooleanDefaultTrueConfig("ECS_EXCLUDE_IPV6_PORTBINDING"),
	}, err
}