podman-remote.conf enablement

add the ability for the podman remote client to use a configuration file
which describes its connections. users can now define a connection the
configuration and then call it by name like:

podman-remote -c connection1

and the destination and user will be derived from the configuration
file.  if no -c is provided, we look for a connection in the
configuration file designated as 'default'.  If the configuration file
has only one connection, it will be deemed the 'default'.

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

pkg/adapter/client_unix.go

@@ -0,0 +1,30 @@
+// +build linux darwin
+// +build remoteclient
+
+package adapter
+
+import (
+	"fmt"
+
+	"github.com/containers/libpod/cmd/podman/remoteclientconfig"
+	"github.com/pkg/errors"
+)
+
+// 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 = fmt.Sprintf(
+		`ssh -T %s@%s -- /usr/bin/varlink -A \'/usr/bin/podman --log-level=%s varlink \\\$VARLINK_ADDRESS\' bridge`,
+		remoteConn.Username, remoteConn.Destination, logLevel)
+	return &endpoint, nil
+}