test/e2e: wait for socket

Do not use podman info/version as they are expensive and clutter the log
for no reason. Just checking if we can connect to the socket should be
good enough and much faster.

Fix the non existing error checking, so that we actually see an useful
error when this does not work.

Also change the interval, why wait 2s for a retry lets take 100ms steps
instead.

Fixes #19010

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/e2e/common_test.go

@@ -57,7 +57,6 @@ type PodmanTestIntegration struct {
 	CgroupManager       string
 	Host                HostOS
 	TmpDir              string
-	RemoteStartErr      error
 }
 
 var LockTmpDir string

test/e2e/libpod_suite_remote_test.go

@@ -6,6 +6,7 @@ package integration
 import (
 	"errors"
 	"fmt"
+	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -94,7 +95,8 @@ func (p *PodmanTestIntegration) StartRemoteService() {
 	command.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 	p.RemoteCommand = command
 	p.RemoteSession = command.Process
-	p.RemoteStartErr = p.DelayForService()
+	err = p.DelayForService()
+	Expect(err).ToNot(HaveOccurred())
 }
 
 func (p *PodmanTestIntegration) StopRemoteService() {
@@ -145,16 +147,15 @@ func (p *PodmanTestIntegration) RestoreArtifact(image string) error {
 }
 
 func (p *PodmanTestIntegration) DelayForService() error {
-	var session *PodmanSessionIntegration
-	for i := 0; i < 5; i++ {
-		session = p.Podman([]string{"info"})
-		session.WaitWithDefaultTimeout()
-		if session.ExitCode() == 0 {
+	var err error
+	var conn net.Conn
+	for i := 0; i < 100; i++ {
+		conn, err = net.Dial("unix", strings.TrimPrefix(p.RemoteSocket, "unix:"))
+		if err == nil {
+			conn.Close()
 			return nil
-		} else if i == 4 {
-			break
 		}
-		time.Sleep(2 * time.Second)
+		time.Sleep(100 * time.Millisecond)
 	}
-	return fmt.Errorf("service not detected, exit code(%d)", session.ExitCode())
+	return fmt.Errorf("service socket not detected, timeout after 10 seconds: %w", err)
 }