Report correct RemoteURI

Rather than assuming a filesystem path, the API service URI is recorded
in the libpod runtime configuration and then reported as requested.

Note: All schemes other than "unix" are hard-coded to report URI exists.

Fixes #12023

Signed-off-by: Jhon Honce <jhonce@redhat.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

3 files changed, 30 insertions, 58 deletions

diff --git a/pkg/api/server/server.go b/pkg/api/server/server.go
index a906a01f1..7f5537fb4 100644
--- a/pkg/api/server/server.go
+++ b/pkg/api/server/server.go
@@ -20,7 +20,6 @@ import (
 	"github.com/containers/podman/v4/pkg/api/server/idle"
 	"github.com/containers/podman/v4/pkg/api/types"
 	"github.com/containers/podman/v4/pkg/domain/entities"
-	"github.com/coreos/go-systemd/v22/activation"
 	"github.com/coreos/go-systemd/v22/daemon"
 	"github.com/gorilla/mux"
 	"github.com/gorilla/schema"
@@ -65,25 +64,7 @@ func NewServerWithSettings(runtime *libpod.Runtime, listener net.Listener, opts
 }
 
 func newServer(runtime *libpod.Runtime, listener net.Listener, opts entities.ServiceOptions) (*APIServer, error) {
-	// If listener not provided try socket activation protocol
-	if listener == nil {
-		if _, found := os.LookupEnv("LISTEN_PID"); !found {
-			return nil, fmt.Errorf("no service listener provided and socket activation protocol is not active")
-		}
-
-		listeners, err := activation.Listeners()
-		if err != nil {
-			return nil, fmt.Errorf("cannot retrieve file descriptors from systemd: %w", err)
-		}
-		if len(listeners) != 1 {
-			return nil, fmt.Errorf("wrong number of file descriptors for socket activation protocol (%d != 1)", len(listeners))
-		}
-		listener = listeners[0]
-		// note that activation.Listeners() return nil when it cannot listen on the fd (i.e. udp connection)
-		if listener == nil {
-			return nil, fmt.Errorf("unexpected fd received from systemd: cannot listen on it")
-		}
-	}
+	logrus.Infof("API service listening on %q. URI: %q", listener.Addr(), runtime.RemoteURI())
 	if opts.CorsHeaders == "" {
 		logrus.Debug("CORS Headers were not set")
 	} else {
diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index 8e96e4154..17df0e3f8 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -6,6 +6,7 @@ import (
 	"net/url"
 	"os"
 	"os/exec"
+	"path/filepath"
 
 	"github.com/containers/common/pkg/cgroups"
 	"github.com/containers/common/pkg/config"
@@ -27,27 +28,40 @@ func (ic *ContainerEngine) Info(ctx context.Context) (*define.Info, error) {
 	if err != nil {
 		return nil, err
 	}
+	info.Host.RemoteSocket = &define.RemoteSocket{Path: ic.Libpod.RemoteURI()}
 
-	socketPath, err := util.SocketPath()
+	// `podman system connection add` invokes podman via ssh to fill in connection string. Here
+	// we are reporting the default systemd activation socket path as we cannot know if a future
+	// service may be run with another URI.
+	if ic.Libpod.RemoteURI() == "" {
+		xdg := "/run"
+		if path, err := util.GetRuntimeDir(); err != nil {
+			// Info is as good as we can guess...
+			return info, err
+		} else if path != "" {
+			xdg = path
+		}
+
+		uri := url.URL{
+			Scheme: "unix",
+			Path:   filepath.Join(xdg, "podman", "podman.sock"),
+		}
+		ic.Libpod.SetRemoteURI(uri.String())
+		info.Host.RemoteSocket.Path = uri.Path
+	}
+
+	uri, err := url.Parse(ic.Libpod.RemoteURI())
 	if err != nil {
 		return nil, err
 	}
-	rs := define.RemoteSocket{
-		Path:   socketPath,
-		Exists: false,
-	}
 
-	// Check if the socket exists
-	if fi, err := os.Stat(socketPath); err == nil {
-		if fi.Mode()&os.ModeSocket != 0 {
-			rs.Exists = true
-		}
+	if uri.Scheme == "unix" {
+		_, err := os.Stat(uri.Path)
+		info.Host.RemoteSocket.Exists = err == nil
+	} else {
+		info.Host.RemoteSocket.Exists = true
 	}
-	// TODO
-	// it was suggested future versions of this could perform
-	// a ping on the socket for greater confidence the socket is
-	// actually active.
-	info.Host.RemoteSocket = &rs
+
 	return info, err
 }
 
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 9842a0f73..a0bf8b50d 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -731,29 +731,6 @@ func IDtoolsToRuntimeSpec(idMaps []idtools.IDMap) (convertedIDMap []specs.LinuxI
 	return convertedIDMap
 }
 
-var socketPath string
-
-func SetSocketPath(path string) {
-	socketPath = path
-}
-
-func SocketPath() (string, error) {
-	if socketPath != "" {
-		return socketPath, nil
-	}
-	xdg, err := GetRuntimeDir()
-	if err != nil {
-		return "", err
-	}
-	if len(xdg) == 0 {
-		// If no xdg is returned, assume root socket
-		xdg = "/run"
-	}
-
-	// Glue the socket path together
-	return filepath.Join(xdg, "podman", "podman.sock"), nil
-}
-
 func LookupUser(name string) (*user.User, error) {
 	// Assume UID look up first, if it fails lookup by username
 	if u, err := user.LookupId(name); err == nil {