systemd/TRANSIENT-SETTINGS.md

# What settings are currently available for transient units?

Our intention is to make all settings that are available as unit file settings
also available for transient units, through the D-Bus API. At the moment, some
unit types (device, swap, target) are not supported at all via unit types,
but most others are pretty well supported, with some notable omissions.

The lists below contain all settings currently available in unit files. The
ones currently available in transient units are prefixed with `✓`.

## Generic Unit Settings

Only the most important generic unit settings are available for transient units.

```
✓ Description=
  Documentation=
  SourcePath=
✓ Requires=
✓ Requisite=
✓ Wants=
✓ BindsTo=
✓ Conflicts=
✓ Before=
✓ After=
✓ OnFailure=
✓ PropagatesReloadTo=
✓ ReloadPropagatedFrom=
✓ PartOf=
  JoinsNamespaceOf=
  RequiresMountsFor=
  StopWhenUnneeded=
  RefuseManualStart=
  RefuseManualStop=
  AllowIsolate=
✓ DefaultDependencies=
  OnFailureJobMode=
  OnFailureIsolate=
  IgnoreOnIsolate=
  JobTimeoutSec=
  JobRunningTimeoutSec=
  JobTimeoutAction=
  JobTimeoutRebootArgument=
  StartLimitIntervalSec=SECONDS
  StartLimitBurst=UNSIGNED
  StartLimitAction=ACTION
✓ FailureAction=
✓ SuccessAction=
✓ AddRef=
  RebootArgument=STRING
  ConditionPathExists=
  ConditionPathExistsGlob=
  ConditionPathIsDirectory=
  ConditionPathIsSymbolicLink=
  ConditionPathIsMountPoint=
  ConditionPathIsReadWrite=
  ConditionDirectoryNotEmpty=
  ConditionFileNotEmpty=
  ConditionFileIsExecutable=
  ConditionNeedsUpdate=
  ConditionFirstBoot=
  ConditionKernelCommandLine=
  ConditionArchitecture=
  ConditionVirtualization=
  ConditionSecurity=
  ConditionCapability=
  ConditionHost=
  ConditionACPower=
  ConditionUser=
  ConditionGroup=
  ConditionControlGroupController=
  AssertPathExists=
  AssertPathExistsGlob=
  AssertPathIsDirectory=
  AssertPathIsSymbolicLink=
  AssertPathIsMountPoint=
  AssertPathIsReadWrite=
  AssertDirectoryNotEmpty=
  AssertFileNotEmpty=
  AssertFileIsExecutable=
  AssertNeedsUpdate=
  AssertFirstBoot=
  AssertKernelCommandLine=
  AssertArchitecture=
  AssertVirtualization=
  AssertSecurity=
  AssertCapability=
  AssertHost=
  AssertACPower=
  AssertUser=
  AssertGroup=
  AssertControlGroupController=
✓ CollectMode=
```

## Execution-Related Settings

All execution-related settings are available for transient units.

```
✓ WorkingDirectory=
✓ RootDirectory=
✓ RootImage=
✓ User=
✓ Group=
✓ SupplementaryGroups=
✓ Nice=
✓ OOMScoreAdjust=
✓ IOSchedulingClass=
✓ IOSchedulingPriority=
✓ CPUSchedulingPolicy=
✓ CPUSchedulingPriority=
✓ CPUSchedulingResetOnFork=
✓ CPUAffinity=
✓ UMask=
✓ Environment=
✓ EnvironmentFile=
✓ PassEnvironment=
✓ UnsetEnvironment=
✓ DynamicUser=
✓ RemoveIPC=
✓ StandardInput=
✓ StandardOutput=
✓ StandardError=
✓ StandardInputText=
✓ StandardInputData=
✓ TTYPath=
✓ TTYReset=
✓ TTYVHangup=
✓ TTYVTDisallocate=
✓ SyslogIdentifier=
✓ SyslogFacility=
✓ SyslogLevel=
✓ SyslogLevelPrefix=
✓ LogLevelMax=
✓ LogExtraFields=
✓ SecureBits=
✓ CapabilityBoundingSet=
✓ AmbientCapabilities=
✓ TimerSlackNSec=
✓ NoNewPrivileges=
✓ KeyringMode=
✓ SystemCallFilter=
✓ SystemCallArchitectures=
✓ SystemCallErrorNumber=
✓ MemoryDenyWriteExecute=
✓ RestrictNamespaces=
✓ RestrictRealtime=
✓ RestrictAddressFamilies=
✓ LockPersonality=
✓ LimitCPU=
✓ LimitFSIZE=
✓ LimitDATA=
✓ LimitSTACK=
✓ LimitCORE=
✓ LimitRSS=
✓ LimitNOFILE=
✓ LimitAS=
✓ LimitNPROC=
✓ LimitMEMLOCK=
✓ LimitLOCKS=
✓ LimitSIGPENDING=
✓ LimitMSGQUEUE=
✓ LimitNICE=
✓ LimitRTPRIO=
✓ LimitRTTIME=
✓ ReadWritePaths=
✓ ReadOnlyPaths=
✓ InaccessiblePaths=
✓ BindPaths=
✓ BindReadOnlyPaths=
✓ PrivateTmp=
✓ PrivateDevices=
✓ ProtectKernelTunables=
✓ ProtectKernelModules=
✓ ProtectControlGroups=
✓ PrivateNetwork=
✓ PrivateUsers=
✓ ProtectSystem=
✓ ProtectHome=
✓ MountFlags=
✓ MountAPIVFS=
✓ Personality=
✓ RuntimeDirectoryPreserve=
✓ RuntimeDirectoryMode=
✓ RuntimeDirectory=
✓ StateDirectoryMode=
✓ StateDirectory=
✓ CacheDirectoryMode=
✓ CacheDirectory=
✓ LogsDirectoryMode=
✓ LogsDirectory=
✓ ConfigurationDirectoryMode=
✓ ConfigurationDirectory=
✓ PAMName=
✓ IgnoreSIGPIPE=
✓ UtmpIdentifier=
✓ UtmpMode=
✓ SELinuxContext=
✓ SmackProcessLabel=
✓ AppArmorProfile=
✓ Slice=
```

## Resource Control Settings

All cgroup/resource control settings are available for transient units

```
✓ CPUAccounting=
✓ CPUWeight=
✓ StartupCPUWeight=
✓ CPUShares=
✓ StartupCPUShares=
✓ CPUQuota=
✓ MemoryAccounting=
✓ MemoryLow=
✓ MemoryHigh=
✓ MemoryMax=
✓ MemorySwapMax=
✓ MemoryLimit=
✓ DeviceAllow=
✓ DevicePolicy=
✓ IOAccounting=
✓ IOWeight=
✓ StartupIOWeight=
✓ IODeviceWeight=
✓ IOReadBandwidthMax=
✓ IOWriteBandwidthMax=
✓ IOReadIOPSMax=
✓ IOWriteIOPSMax=
✓ BlockIOAccounting=
✓ BlockIOWeight=
✓ StartupBlockIOWeight=
✓ BlockIODeviceWeight=
✓ BlockIOReadBandwidth=
✓ BlockIOWriteBandwidth=
✓ TasksAccounting=
✓ TasksMax=
✓ Delegate=
✓ IPAccounting=
✓ IPAddressAllow=
✓ IPAddressDeny=
```

## Process Killing Settings

All process killing settings are available for transient units:

```
✓ SendSIGKILL=
✓ SendSIGHUP=
✓ KillMode=
✓ KillSignal=
```

## Service Unit Settings

Only the most important service settings are available for transient units.

```
  PIDFile=
✓ ExecStartPre=
✓ ExecStart=
✓ ExecStartPost=
✓ ExecReload=
✓ ExecStop=
✓ ExecStopPost=
  RestartSec=
  TimeoutStartSec=
  TimeoutStopSec=
  TimeoutSec=
✓ RuntimeMaxSec=
  WatchdogSec=
✓ Type=
✓ Restart=
  PermissionsStartOnly=
  RootDirectoryStartOnly=
✓ RemainAfterExit=
  GuessMainPID=
  RestartPreventExitStatus=
  RestartForceExitStatus=
  SuccessExitStatus=
✓ NonBlocking=
  BusName=
✓ FileDescriptorStoreMax=
✓ NotifyAccess=
  Sockets=
  USBFunctionDescriptors=
  USBFunctionStrings=
```

## Mount Unit Settings

Only the most important mount unit settings are currently available to transient units:

```
✓ What=
  Where=
✓ Options=
✓ Type=
  TimeoutSec=
  DirectoryMode=
  SloppyOptions=
  LazyUnmount=
  ForceUnmount=
```

## Automount Unit Settings

Only one automount unit setting is currently available to transient units:

```
  Where=
  DirectoryMode=
✓ TimeoutIdleSec=
```

## Timer Unit Settings

Most timer unit settings are available to transient units.

```
✓ OnCalendar=
✓ OnActiveSec=
✓ OnBootSec=
✓ OnStartupSec=
✓ OnUnitActiveSec=
✓ OnUnitInactiveSec=
✓ Persistent=
✓ WakeSystem=
✓ RemainAfterElapse=
✓ AccuracySec=
✓ RandomizedDelaySec=
  Unit=
```

## Slice Unit Settings

Slice units are fully supported as transient units, but they have no settings
of their own beyond the generic unit and resource control settings.

## Scope Unit Settings

Scope units are fully supported as transient units (in fact they only exist as
such), but they have no settings of their own beyond the generic unit,
resource control, and process killing settings.

## Socket Unit Settings

Most socket unit settings are available to transient units.

```
✓ ListenStream=
✓ ListenDatagram=
✓ ListenSequentialPacket=
✓ ListenFIFO=
✓ ListenNetlink=
✓ ListenSpecial=
✓ ListenMessageQueue=
✓ ListenUSBFunction=
✓ SocketProtocol=
✓ BindIPv6Only=
✓ Backlog=
✓ BindToDevice=
✓ ExecStartPre=
✓ ExecStartPost=
✓ ExecStopPre=
✓ ExecStopPost=
✓ TimeoutSec=
✓ SocketUser=
✓ SocketGroup=
✓ SocketMode=
✓ DirectoryMode=
✓ Accept=
✓ Writable=
✓ MaxConnections=
✓ MaxConnectionsPerSource=
✓ KeepAlive=
✓ KeepAliveTimeSec=
✓ KeepAliveIntervalSec=
✓ KeepAliveProbes=
✓ DeferAcceptSec=
✓ NoDelay=
✓ Priority=
✓ ReceiveBuffer=
✓ SendBuffer=
✓ IPTOS=
✓ IPTTL=
✓ Mark=
✓ PipeSize=
✓ FreeBind=
✓ Transparent=
✓ Broadcast=
✓ PassCredentials=
✓ PassSecurity=
✓ TCPCongestion=
✓ ReusePort=
✓ MessageQueueMaxMessages=
✓ MessageQueueMessageSize=
✓ RemoveOnStop=
✓ Symlinks=
✓ FileDescriptorName=
  Service=
✓ TriggerLimitIntervalSec=
✓ TriggerLimitBurst=
✓ SmackLabel=
✓ SmackLabelIPIn=
✓ SmackLabelIPOut=
✓ SELinuxContextFromNet=
```

## Swap Unit Settings

Swap units are currently not available at all as transient units:

```
  What=
  Priority=
  Options=
  TimeoutSec=
```

## Path Unit Settings

Most path unit settings are available to transient units.

```
✓ PathExists=
✓ PathExistsGlob=
✓ PathChanged=
✓ PathModified=
✓ DirectoryNotEmpty=
  Unit=
✓ MakeDirectory=
✓ DirectoryMode=
```

## Install Section

The `[Install]` section is currently not available at all for transient units, and it probably doesn't even make sense.

```
  Alias=
  WantedBy=
  RequiredBy=
  Also=
  DefaultInstance=
```