add varlink bridge

allow the user to define a remote host and remote username for their
remote podman sessions.  this is then feed to the varlink "bridge" as
the ssh credentials and endpoint.

Signed-off-by: baude <bbaude@redhat.com>

pkg/adapter/client.go

@@ -3,30 +3,45 @@
 package adapter
 
 import (
+	"fmt"
 	"os"
 
-	"github.com/sirupsen/logrus"
+	"github.com/pkg/errors"
 	"github.com/varlink/go/varlink"
 )
 
-// DefaultAddress is the default address of the varlink socket
-const DefaultAddress = "unix:/run/podman/io.podman"
+type VarlinkConnectionInfo struct {
+	RemoteUserName string
+	RemoteHost     string
+	VarlinkAddress string
+}
 
 // Connect provides a varlink connection
 func (r RemoteRuntime) Connect() (*varlink.Connection, error) {
-	var err error
-	var connection *varlink.Connection
-	if bridge := os.Getenv("PODMAN_VARLINK_BRIDGE"); bridge != "" {
-		logrus.Infof("Connecting with varlink bridge")
-		logrus.Debugf("%s", bridge)
+	var (
+		err        error
+		connection *varlink.Connection
+	)
+
+	logLevel := r.cmd.LogLevel
+
+	// I'm leaving this here for now as a document of the birdge format.  It can be removed later once the bridge
+	// function is more flushed out.
+	//bridge := `ssh -T root@192.168.122.1 "/usr/bin/varlink -A '/usr/bin/podman varlink \$VARLINK_ADDRESS' bridge"`
+	if len(r.cmd.RemoteHost) > 0 {
+		// The user has provided a remote host endpoint
+		if len(r.cmd.RemoteUserName) < 1 {
+			return nil, errors.New("you must provide a username when providing a remote host name")
+		}
+		bridge := fmt.Sprintf(`ssh -T %s@%s /usr/bin/varlink -A \'/usr/bin/podman --log-level=%s varlink \\\$VARLINK_ADDRESS\' bridge`, r.cmd.RemoteUserName, r.cmd.RemoteHost, logLevel)
+		connection, err = varlink.NewBridge(bridge)
+	} else if bridge := os.Getenv("PODMAN_VARLINK_BRIDGE"); bridge != "" {
 		connection, err = varlink.NewBridge(bridge)
 	} else {
 		address := os.Getenv("PODMAN_VARLINK_ADDRESS")
 		if address == "" {
 			address = DefaultAddress
 		}
-		logrus.Infof("Connecting with varlink address")
-		logrus.Debugf("%s", address)
 		connection, err = varlink.NewConnection(address)
 	}
 	if err != nil {

pkg/adapter/client_config.go

@@ -0,0 +1,4 @@
+package adapter
+
+// DefaultAddress is the default address of the varlink socket
+const DefaultAddress = "unix:/run/podman/io.podman"

pkg/adapter/runtime_remote.go

@@ -38,6 +38,7 @@ type RemoteImageRuntime struct{}
 type RemoteRuntime struct {
 	Conn   *varlink.Connection
 	Remote bool
+	cmd    cliconfig.MainFlags
 }
 
 // LocalRuntime describes a typical libpod runtime
@@ -47,17 +48,17 @@ type LocalRuntime struct {
 
 // GetRuntime returns a LocalRuntime struct with the actual runtime embedded in it
 func GetRuntime(ctx context.Context, c *cliconfig.PodmanCommand) (*LocalRuntime, error) {
-	runtime := RemoteRuntime{}
+	runtime := RemoteRuntime{
+		Remote: true,
+		cmd:    c.GlobalFlags,
+	}
 	conn, err := runtime.Connect()
 	if err != nil {
 		return nil, err
 	}
-
+	runtime.Conn = conn
 	return &LocalRuntime{
-		&RemoteRuntime{
-			Conn:   conn,
-			Remote: true,
-		},
+		&runtime,
 	}, nil
 }