feat: Use environment variables and startup script in agent (#1147)

These values were ignored. Environment variables are applied to
new sessions, and are refreshed on reconnect. This is cool because
a workspace could be updated with new environment variables without
requiring a complete start/stop.

The startup script is only ran once regardless of changes, which
feels like the expected behavior.

coderd/coderd.go

@@ -197,7 +197,8 @@ func New(options *Options) (http.Handler, func()) {
 			r.Post("/google-instance-identity", api.postWorkspaceAuthGoogleInstanceIdentity)
 			r.Route("/me", func(r chi.Router) {
 				r.Use(httpmw.ExtractWorkspaceAgent(options.Database))
-				r.Get("/", api.workspaceAgentListen)
+				r.Get("/", api.workspaceAgentMe)
+				r.Get("/listen", api.workspaceAgentListen)
 				r.Get("/gitsshkey", api.agentGitSSHKey)
 				r.Get("/turn", api.workspaceAgentTurn)
 				r.Get("/iceservers", api.workspaceAgentICEServers)

coderd/workspaceagents.go

@@ -88,6 +88,18 @@ func (api *api) workspaceAgentDial(rw http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (api *api) workspaceAgentMe(rw http.ResponseWriter, r *http.Request) {
+	agent := httpmw.WorkspaceAgent(r)
+	apiAgent, err := convertWorkspaceAgent(agent, api.AgentConnectionUpdateFrequency)
+	if err != nil {
+		httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
+			Message: fmt.Sprintf("convert workspace agent: %s", err),
+		})
+		return
+	}
+	httpapi.Write(rw, http.StatusOK, apiAgent)
+}
+
 func (api *api) workspaceAgentListen(rw http.ResponseWriter, r *http.Request) {
 	api.websocketWaitMutex.Lock()
 	api.websocketWaitGroup.Add(1)

coderd/workspaceagents_test.go

@@ -102,6 +102,8 @@ func TestWorkspaceAgentListen(t *testing.T) {
 	})
 	_, err = conn.Ping()
 	require.NoError(t, err)
+	_, err = agentClient.WorkspaceAgent(context.Background(), codersdk.Me)
+	require.NoError(t, err)
 }
 
 func TestWorkspaceAgentTURN(t *testing.T) {