Copyright	(c) Nickolay Kudasov 2014
License	BSD-style (see the file LICENSE)
Maintainer	nickolay.kudasov@gmail.com
Safe Haskell	None
Language	Haskell2010

System.LXC.Internal.AttachOptions

Description

Internal module to support options and structures to run commands inside LXC containers. Normally you should import System.LXC module only.

Synopsis

Documentation

newtype AttachExecFn

exec function to use for attach.

See attachRunCommand and attachRunShell.

Constructors

AttachExecFn
Fields getAttachExecFn :: C_lxc_attach_exec_t

data AttachEnvPolicy

LXC environment policy.

Constructors

AttachKeepEnv	Retain the environment.
AttachClearEnv	Clear the environment.

Instances

Eq AttachEnvPolicy
Show AttachEnvPolicy

fromAttachEnvPolicy :: Num a => AttachEnvPolicy -> a

Convert AttachEnvPolicy to internal representation.

data AttachFlag

Flags for attach.

Constructors

AttachMoveToCGroup	Move to cgroup. On by default.
AttachDropCapabilities	Drop capabilities. On by default.
AttachSetPersonality	Set personality. On by default
AttachLSMExec	Execute under a Linux Security Module. On by default.
AttachRemountProcSys	Remount /proc filesystem. Off by default.
AttachLSMNow	FIXME: unknown. Off by default.
AttachDefault	Mask of flags to apply by default.
AttachLSM	All Linux Security Module flags.

Instances

Eq AttachFlag
Show AttachFlag

fromAttachFlag :: Num a => AttachFlag -> a

Convert AttachFlag to bit flag.

data AttachOptions

LXC attach options for attach.

NOTE: for stdin, stdout and stderr descriptors dup2() will be used before calling exec_function, (assuming not 0, 1 and 2 are specified) and the original fds are closed before passing control over. Any O_CLOEXEC flag will be removed after that.

Constructors

AttachOptions

Fields

attachFlags :: [AttachFlag]

Any combination of AttachFlag flags.

attachNamespaces :: Int

The namespaces to attach to (CLONE_NEW... flags). | Initial personality (Nothing to autodetect).

This may be ignored if lxc is compiled without personality support

attachPersonality :: Maybe Int64

attachInitialCWD :: Maybe FilePath

Inital current directory, Nothing to use cwd.

If the current directory does not exist in the container, the root directory will be used instead because of kernel defaults.

attachUID :: UserID

The user-id to run as.

NOTE: Set to -1 for default behaviour (init uid for userns containers or 0 (super-user) if detection fails).

attachGID :: GroupID

The group-id to run as.

NOTE: Set to -1 for default behaviour (init gid for userns containers or 0 (super-user) if detection fails).

attachEnvPolicy :: AttachEnvPolicy

Environment policy.

attachExtraEnvVars :: [String]

Extra environment variables to set in the container environment.

attachExtraKeepEnv :: [String]

Names of environment variables in existing environment to retain in container environment.

attachStdinFD :: Fd

stdin file descriptor.

attachStdoutFD :: Fd

stdout file descriptor.

attachStderrFD :: Fd

stderr file descriptor.

Instances

Show AttachOptions

defaultAttachOptions :: AttachOptions

Default attach options to use.

data AttachCommand

Representation of a command to run in a container.

Constructors

AttachCommand
Fields attachProgram :: FilePath The program to run (passed to `execvp`). attachArgv :: [String] The `argv` of that program, including the program itself as the first element.

withC'lxc_attach_options_t :: AttachOptions -> (Ptr C'lxc_attach_options_t -> IO a) -> IO a

Allocate lxc_attach_options_t structure in a temporary storage.

withC'lxc_attach_command_t :: AttachCommand -> (Ptr C'lxc_attach_command_t -> IO a) -> IO a

Allocate lxc_attach_command_t structure in a temporary storage.

attachRunCommand :: AttachExecFn

Run a command in the container.

attachRunShell :: AttachExecFn

Run a shell command in the container.