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// +build remoteclient
package adapter
import (
"fmt"
"os"
"github.com/containers/libpod/cmd/podman/remoteclientconfig"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/varlink/go/varlink"
)
var remoteEndpoint *Endpoint
func (r RemoteRuntime) RemoteEndpoint() (remoteEndpoint *Endpoint, err error) {
remoteConfigConnections, err := remoteclientconfig.ReadRemoteConfig(r.config)
if err != nil && errors.Cause(err) != remoteclientconfig.ErrNoConfigationFile {
return nil, err
}
// If the user defines an env variable for podman_varlink_bridge
// we use that as passed.
if bridge := os.Getenv("PODMAN_VARLINK_BRIDGE"); bridge != "" {
logrus.Debug("creating a varlink bridge based on env variable")
remoteEndpoint, err = newBridgeConnection(bridge, nil, r.cmd.LogLevel)
// if an environment variable for podman_varlink_address is defined,
// we used that as passed
} else if address := os.Getenv("PODMAN_VARLINK_ADDRESS"); address != "" {
logrus.Debug("creating a varlink address based on env variable: %s", address)
remoteEndpoint, err = newSocketConnection(address)
// if the user provides a remote host, we use it to configure a bridge connection
} else if len(r.cmd.RemoteHost) > 0 {
logrus.Debug("creating a varlink bridge based on user input")
if len(r.cmd.RemoteUserName) < 1 {
return nil, errors.New("you must provide a username when providing a remote host name")
}
rc := remoteclientconfig.RemoteConnection{r.cmd.RemoteHost, r.cmd.RemoteUserName, false, r.cmd.Port, r.cmd.IdentityFile, r.cmd.IgnoreHosts}
remoteEndpoint, err = newBridgeConnection("", &rc, r.cmd.LogLevel)
// if the user has a config file with connections in it
} else if len(remoteConfigConnections.Connections) > 0 {
logrus.Debug("creating a varlink bridge based configuration file")
var rc *remoteclientconfig.RemoteConnection
if len(r.cmd.ConnectionName) > 0 {
rc, err = remoteConfigConnections.GetRemoteConnection(r.cmd.ConnectionName)
} else {
rc, err = remoteConfigConnections.GetDefault()
}
if err != nil {
return nil, err
}
if len(rc.Username) < 1 {
logrus.Debugf("Connection has no username, using current user %q", r.cmd.RemoteUserName)
rc.Username = r.cmd.RemoteUserName
}
remoteEndpoint, err = newBridgeConnection("", rc, r.cmd.LogLevel)
// last resort is to make a socket connection with the default varlink address for root user
} else {
logrus.Debug("creating a varlink address based default root address")
remoteEndpoint, err = newSocketConnection(DefaultVarlinkAddress)
}
return
}
// Connect provides a varlink connection
func (r RemoteRuntime) Connect() (*varlink.Connection, error) {
ep, err := r.RemoteEndpoint()
if err != nil {
return nil, err
}
switch ep.Type {
case DirectConnection:
return varlink.NewConnection(ep.Connection)
case BridgeConnection:
return varlink.NewBridge(ep.Connection)
}
return nil, errors.New(fmt.Sprintf("Unable to determine type of varlink connection: %s", ep.Connection))
}
// RefreshConnection is used to replace the current r.Conn after things like
// using an upgraded varlink connection
func (r RemoteRuntime) RefreshConnection() error {
newConn, err := r.Connect()
if err != nil {
return err
}
r.Conn = newConn
return nil
}
// newSocketConnection returns an endpoint for a uds based connection
func newSocketConnection(address string) (*Endpoint, error) {
endpoint := Endpoint{
Type: DirectConnection,
Connection: address,
}
return &endpoint, nil
}
// newBridgeConnection creates a bridge type endpoint with username, destination, and log-level
func newBridgeConnection(formattedBridge string, remoteConn *remoteclientconfig.RemoteConnection, logLevel string) (*Endpoint, error) {
endpoint := Endpoint{
Type: BridgeConnection,
}
if len(formattedBridge) < 1 && remoteConn == nil {
return nil, errors.New("bridge connections must either be created by string or remoteconnection")
}
if len(formattedBridge) > 0 {
endpoint.Connection = formattedBridge
return &endpoint, nil
}
endpoint.Connection = formatDefaultBridge(remoteConn, logLevel)
return &endpoint, nil
}
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