Merge pull request #5245 from giuseppe/rootless-portmapping-detach

rootless: fix a regression when using -d

2 files changed, 18 insertions, 6 deletions

diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go
index d90bcb708..fa8593f20 100644
--- a/libpod/networking_linux.go
+++ b/libpod/networking_linux.go
@@ -335,10 +335,13 @@ func (r *Runtime) setupRootlessPortMapping(ctr *Container, netnsPath string) (er
 		return errors.Wrapf(err, "delete file %s", logPath)
 	}
 
-	ctr.rootlessPortSyncR, ctr.rootlessPortSyncW, err = os.Pipe()
-	if err != nil {
-		return errors.Wrapf(err, "failed to create rootless port sync pipe")
+	if !ctr.config.PostConfigureNetNS {
+		ctr.rootlessPortSyncR, ctr.rootlessPortSyncW, err = os.Pipe()
+		if err != nil {
+			return errors.Wrapf(err, "failed to create rootless port sync pipe")
+		}
 	}
+
 	cfg := rootlessport.Config{
 		Mappings:  ctr.config.PortMappings,
 		NetNSPath: netnsPath,
@@ -355,6 +358,11 @@ func (r *Runtime) setupRootlessPortMapping(ctr *Container, netnsPath string) (er
 	cmd := exec.Command(fmt.Sprintf("/proc/%d/exe", os.Getpid()))
 	cmd.Args = []string{rootlessport.ReexecKey}
 	// Leak one end of the pipe in rootlessport process, the other will be sent to conmon
+
+	if ctr.rootlessPortSyncR != nil {
+		defer errorhandling.CloseQuiet(ctr.rootlessPortSyncR)
+	}
+
 	cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessPortSyncR, syncW)
 	cmd.Stdin = cfgR
 	// stdout is for human-readable error, stderr is for debug log
diff --git a/libpod/oci_conmon_linux.go b/libpod/oci_conmon_linux.go
index 722012386..07d38693f 100644
--- a/libpod/oci_conmon_linux.go
+++ b/libpod/oci_conmon_linux.go
@@ -1161,6 +1161,13 @@ func (r *ConmonOCIRuntime) createOCIContainer(ctr *Container, restoreOptions *Co
 
 	if ctr.config.NetMode.IsSlirp4netns() {
 		if ctr.config.PostConfigureNetNS {
+			havePortMapping := len(ctr.Config().PortMappings) > 0
+			if havePortMapping {
+				ctr.rootlessPortSyncR, ctr.rootlessPortSyncW, err = os.Pipe()
+				if err != nil {
+					return errors.Wrapf(err, "failed to create rootless port sync pipe")
+				}
+			}
 			ctr.rootlessSlirpSyncR, ctr.rootlessSlirpSyncW, err = os.Pipe()
 			if err != nil {
 				return errors.Wrapf(err, "failed to create rootless network sync pipe")
@@ -1176,9 +1183,6 @@ func (r *ConmonOCIRuntime) createOCIContainer(ctr *Container, restoreOptions *Co
 		// Leak one end in conmon, the other one will be leaked into slirp4netns
 		cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessSlirpSyncW)
 
-		if ctr.rootlessPortSyncR != nil {
-			defer errorhandling.CloseQuiet(ctr.rootlessPortSyncR)
-		}
 		if ctr.rootlessPortSyncW != nil {
 			defer errorhandling.CloseQuiet(ctr.rootlessPortSyncW)
 			// Leak one end in conmon, the other one will be leaked into rootlessport