Merge pull request #12168 from mtrmac/socket-collision

Avoid RemoteSocket collisions in e2e tests

2 files changed, 29 insertions, 5 deletions

diff --git a/test/e2e/common_test.go b/test/e2e/common_test.go
index 6e1a62b99..bd744aa78 100644
--- a/test/e2e/common_test.go
+++ b/test/e2e/common_test.go
@@ -274,14 +274,32 @@ func PodmanTestCreateUtil(tempDir string, remote bool) *PodmanTestIntegration {
 	}
 
 	if remote {
-		uuid := stringid.GenerateNonCryptoID()
+		var pathPrefix string
 		if !rootless.IsRootless() {
-			p.RemoteSocket = fmt.Sprintf("unix:/run/podman/podman-%s.sock", uuid)
+			pathPrefix = "/run/podman/podman"
 		} else {
 			runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
-			socket := fmt.Sprintf("podman-%s.sock", uuid)
-			fqpath := filepath.Join(runtimeDir, socket)
-			p.RemoteSocket = fmt.Sprintf("unix:%s", fqpath)
+			pathPrefix = filepath.Join(runtimeDir, "podman")
+		}
+		// We want to avoid collisions in socket paths, but using the
+		// socket directly for a collision check doesn’t work; bind(2) on AF_UNIX
+		// creates the file, and we need to pass a unique path now before the bind(2)
+		// happens. So, use a podman-%s.sock-lock empty file as a marker.
+		tries := 0
+		for {
+			uuid := stringid.GenerateNonCryptoID()
+			lockPath := fmt.Sprintf("%s-%s.sock-lock", pathPrefix, uuid)
+			lockFile, err := os.OpenFile(lockPath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0700)
+			if err == nil {
+				lockFile.Close()
+				p.RemoteSocketLock = lockPath
+				p.RemoteSocket = fmt.Sprintf("unix:%s-%s.sock", pathPrefix, uuid)
+				break
+			}
+			tries++
+			if tries >= 1000 {
+				panic("Too many RemoteSocket collisions")
+			}
 		}
 	}
 
diff --git a/test/e2e/libpod_suite_remote_test.go b/test/e2e/libpod_suite_remote_test.go
index d60383029..4644e3748 100644
--- a/test/e2e/libpod_suite_remote_test.go
+++ b/test/e2e/libpod_suite_remote_test.go
@@ -1,3 +1,4 @@
+//go:build remote
 // +build remote
 
 package integration
@@ -143,6 +144,11 @@ func (p *PodmanTestIntegration) StopRemoteService() {
 	if err := os.Remove(socket); err != nil {
 		fmt.Println(err)
 	}
+	if p.RemoteSocketLock != "" {
+		if err := os.Remove(p.RemoteSocketLock); err != nil {
+			fmt.Println(err)
+		}
+	}
 }
 
 //MakeOptions assembles all the podman main options