add socket information to podman info

this is step 1 to self-discovery of remote ssh connections.  we add a remotesocket struct to info to detect what the socket path might be.

Co-authored-by: Jhon Honce <jhonce@redhat.com>
Signed-off-by: Brent Baude <bbaude@redhat.com>

3 files changed, 46 insertions, 1 deletions

diff --git a/docs/source/markdown/podman-info.1.md b/docs/source/markdown/podman-info.1.md
index 24ab97c91..19dd61c15 100644
--- a/docs/source/markdown/podman-info.1.md
+++ b/docs/source/markdown/podman-info.1.md
@@ -71,6 +71,9 @@ host:
       commit: 3e425f80a8c931f88e6d94a8c831b9d5aa481657
       spec: 1.0.1-dev
   os: linux
+  remoteSocket:
+    exists: false
+    path: /run/user/1000/podman/podman.sock
   rootless: true
   slirp4netns:
     executable: /bin/slirp4netns
@@ -179,6 +182,10 @@ Run podman info with JSON formatted response:
       "version": "runc version 1.0.0-rc8+dev\ncommit: 3e425f80a8c931f88e6d94a8c831b9d5aa481657\nspec: 1.0.1-dev"
     },
     "os": "linux",
+    "remoteSocket": {
+      "path": "/run/user/1000/podman/podman.sock",
+      "exists": false
+    },
     "rootless": true,
     "slirp4netns": {
       "executable": "/bin/slirp4netns",
diff --git a/libpod/define/info.go b/libpod/define/info.go
index 906aa523f..f136936f7 100644
--- a/libpod/define/info.go
+++ b/libpod/define/info.go
@@ -27,6 +27,7 @@ type HostInfo struct {
 	MemTotal       int64                  `json:"memTotal"`
 	OCIRuntime     *OCIRuntimeInfo        `json:"ociRuntime"`
 	OS             string                 `json:"os"`
+	RemoteSocket   *RemoteSocket          `json:"remoteSocket,omitempty"`
 	Rootless       bool                   `json:"rootless"`
 	RuntimeInfo    map[string]interface{} `json:"runtimeInfo,omitempty"`
 	Slirp4NetNS    SlirpInfo              `json:"slirp4netns,omitempty"`
@@ -36,6 +37,12 @@ type HostInfo struct {
 	Linkmode       string                 `json:"linkmode"`
 }
 
+// RemoteSocket describes information about the API socket
+type RemoteSocket struct {
+	Path   string `json:"path,omitempty"`
+	Exists bool   `json:"exists,omitempty"`
+}
+
 // SlirpInfo describes the slirp exectuable that
 // is being being used.
 type SlirpInfo struct {
diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index 52dfaba7d..9b538b301 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -25,7 +25,38 @@ import (
 )
 
 func (ic *ContainerEngine) Info(ctx context.Context) (*define.Info, error) {
-	return ic.Libpod.Info()
+	info, err := ic.Libpod.Info()
+	if err != nil {
+		return nil, err
+	}
+	xdg, err := util.GetRuntimeDir()
+	if err != nil {
+		return nil, err
+	}
+	if len(xdg) == 0 {
+		// If no xdg is returned, assume root socket
+		xdg = "/run"
+	}
+
+	// Glue the socket path together
+	socketPath := filepath.Join(xdg, "podman", "podman.sock")
+	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
+		}
+	}
+	// 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
 }
 
 func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command) error {