sshutil

package
v2.2.0-beta.0 Latest Latest
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Published: Jul 2, 2026 License: Apache-2.0 Imports: 28 Imported by: 0

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Constants

View Source
const (
	// FormatCmd prints the full ssh command line.
	//
	//	ssh -o IdentityFile="/Users/example/.lima/_config/user" -o User=example -o Hostname=127.0.0.1 -o Port=60022 lima-default
	FormatCmd = FormatT("cmd")

	// FormatArgs is similar to FormatCmd but omits "ssh" and the destination address.
	//
	//	-o IdentityFile="/Users/example/.lima/_config/user" -o User=example -o Hostname=127.0.0.1 -o Port=60022
	FormatArgs = FormatT("args")

	// FormatOptions prints the ssh option key value pairs.
	//
	//	IdentityFile="/Users/example/.lima/_config/user"
	//	User=example
	//	Hostname=127.0.0.1
	//	Port=60022
	FormatOptions = FormatT("options")

	// FormatConfig uses the ~/.ssh/config format
	//
	//	Host lima-default
	//	  IdentityFile "/Users/example/.lima/_config/user "
	//	  User example
	//	  Hostname 127.0.0.1
	//	  Port 60022
	FormatConfig = FormatT("config")
)
View Source
const EnvShellSSH = "SSH"

Environment variable that allows configuring the command (alias) to execute in place of the 'ssh' executable.

Variables

Formats is the list of the supported formats.

Functions

func CommonOpts

func CommonOpts(ctx context.Context, sshExe SSHExe, useDotSSH bool) ([]string, error)

CommonOpts returns ssh option key-value pairs like {"IdentityFile=/path/to/id_foo"}. The result may contain different values with the same key.

The result always contains the IdentityFile option. The result never contains the Port option.

func DetectOpenSSHVersion

func DetectOpenSSHVersion(ctx context.Context, sshExe SSHExe) semver.Version

func DisableControlMasterOptsFromSSHArgs

func DisableControlMasterOptsFromSSHArgs(sshArgs []string) []string

DisableControlMasterOptsFromSSHArgs returns ssh args that disable ControlMaster, ControlPath, and ControlPersist.

func Format

func Format(w io.Writer, sshPath, instName string, format FormatT, opts []string) error

Format formats the ssh options.

func IsControlMasterExisting

func IsControlMasterExisting(instDir string) bool

IsControlMasterExisting returns true if the control socket file exists.

func IsControlMasterRunning

func IsControlMasterRunning(ctx context.Context, instDir string) bool

IsControlMasterRunning reports whether an SSH ControlMaster process is actively listening on the instance's control socket. Unlike IsControlMasterExisting, which only checks that the socket file is present, this dials the socket to verify that a master is alive. A stale socket left behind by an unclean master exit (kill -9, OOM, host crash, or the Cygwin emulation file outliving its process) has no listener and returns false.

func ParseOpenSSHVersion

func ParseOpenSSHVersion(version []byte) *semver.Version

func RemoveStaleControlMaster

func RemoveStaleControlMaster(ctx context.Context, instDir string) (bool, error)

RemoveStaleControlMaster removes the SSH control socket only when no master process is listening on it. It returns true when a stale socket was removed. A live master's socket is never touched (returns false), and a missing socket is treated as a no-op (returns false). This lets callers recover from a wedged session without clobbering a healthy ControlMaster.

func SSHArgsFromOpts

func SSHArgsFromOpts(opts []string) []string

SSHArgsFromOpts returns ssh args from opts. The result always contains {"-F", "/dev/null} in addition to {"-o", "KEY=VALUE", ...}.

func SSHOpts

func SSHOpts(ctx context.Context, sshExe SSHExe, instDir, username string, useDotSSH, forwardAgent, forwardX11, forwardX11Trusted bool) ([]string, error)

SSHOpts adds the following options to CommonOptions: User, ControlMaster, ControlPath, ControlPersist.

func SSHOptsRemovingControlPath

func SSHOptsRemovingControlPath(opts []string) []string

SSHOptsRemovingControlPath removes ControlMaster, ControlPath, and ControlPersist options from SSH options.

Types

type FormatT

type FormatT = string

FormatT specifies the format type.

type PubKey

type PubKey struct {
	Filename string
	Content  string
}

func DefaultPubKeys

func DefaultPubKeys(ctx context.Context, loadDotSSH bool) ([]PubKey, error)

DefaultPubKeys returns the public key from $LIMA_HOME/_config/user.pub. The key will be created if it does not yet exist.

When loadDotSSH is true, ~/.ssh/*.pub will be appended to make the VM accessible without specifying an identity explicitly.

type SSHExe

type SSHExe struct {
	Exe  string
	Args []string
}

func NewSSHExe

func NewSSHExe() (SSHExe, error)

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