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lazy_ssh_agent.go
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lazy_ssh_agent.go
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package cloud
import (
"net"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
// ErrNoSSHAgent occurs when no ssh auth agent exists
var ErrNoSSHAgent = errors.Errorf("no ssh auth agent socket")
type lazySSHAgent struct {
sockPath string
sshAgent agent.ExtendedAgent
}
func (lsa *lazySSHAgent) maybeInit() error {
if lsa.sshAgent != nil {
return nil
}
if lsa.sockPath == "" {
return ErrNoSSHAgent
}
agentSock, err := net.Dial("unix", lsa.sockPath)
if err != nil {
return errors.Wrap(err, "failed to connect to ssh-agent")
}
lsa.sshAgent = agent.NewClient(agentSock)
return nil
}
func (lsa *lazySSHAgent) List() ([]*agent.Key, error) {
err := lsa.maybeInit()
if err != nil {
return nil, err
}
return lsa.sshAgent.List()
}
func (lsa *lazySSHAgent) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
err := lsa.maybeInit()
if err != nil {
return nil, err
}
return lsa.sshAgent.Sign(key, data)
}
func (lsa *lazySSHAgent) Add(key agent.AddedKey) error {
err := lsa.maybeInit()
if err != nil {
return err
}
return lsa.sshAgent.Add(key)
}
func (lsa *lazySSHAgent) Remove(key ssh.PublicKey) error {
err := lsa.maybeInit()
if err != nil {
return err
}
return lsa.sshAgent.Remove(key)
}
func (lsa *lazySSHAgent) RemoveAll() error {
err := lsa.maybeInit()
if err != nil {
return err
}
return lsa.sshAgent.RemoveAll()
}
func (lsa *lazySSHAgent) Lock(passphrase []byte) error {
err := lsa.maybeInit()
if err != nil {
return err
}
return lsa.sshAgent.Lock(passphrase)
}
func (lsa *lazySSHAgent) Unlock(passphrase []byte) error {
err := lsa.maybeInit()
if err != nil {
return err
}
return lsa.sshAgent.Unlock(passphrase)
}
func (lsa *lazySSHAgent) Signers() ([]ssh.Signer, error) {
err := lsa.maybeInit()
if err != nil {
return nil, err
}
return lsa.sshAgent.Signers()
}
func (lsa *lazySSHAgent) SignWithFlags(key ssh.PublicKey, data []byte, flags agent.SignatureFlags) (*ssh.Signature, error) {
err := lsa.maybeInit()
if err != nil {
return nil, err
}
return lsa.sshAgent.SignWithFlags(key, data, flags)
}
func (lsa *lazySSHAgent) Extension(extensionType string, contents []byte) ([]byte, error) {
err := lsa.maybeInit()
if err != nil {
return nil, err
}
return lsa.sshAgent.Extension(extensionType, contents)
}