Merge pull request #3741 from haircommander/uts-fix

Properly share UTS namespaces in a pod

1 files changed, 25 insertions, 12 deletions

diff --git a/pkg/spec/spec.go b/pkg/spec/spec.go
index c94746767..156d6849d 100644
--- a/pkg/spec/spec.go
+++ b/pkg/spec/spec.go
@@ -174,10 +174,20 @@ func (config *CreateConfig) createConfigToOCISpec(runtime *libpod.Runtime, userM
 	}
 
 	hostname := config.Hostname
-	if hostname == "" && (config.NetMode.IsHost() || config.UtsMode.IsHost()) {
-		hostname, err = os.Hostname()
-		if err != nil {
-			return nil, errors.Wrap(err, "unable to retrieve hostname")
+	if hostname == "" {
+		if utsCtrID := config.UtsMode.Container(); utsCtrID != "" {
+			utsCtr, err := runtime.GetContainer(utsCtrID)
+			if err != nil {
+				return nil, errors.Wrapf(err, "unable to retrieve hostname from dependency container %s", utsCtrID)
+			}
+			hostname = utsCtr.Hostname()
+		} else if config.NetMode.IsHost() || config.UtsMode.IsHost() {
+			hostname, err = os.Hostname()
+			if err != nil {
+				return nil, errors.Wrap(err, "unable to retrieve hostname of the host")
+			}
+		} else {
+			logrus.Debug("No hostname set; container's hostname will default to runtime default")
 		}
 	}
 	g.RemoveHostname()
@@ -541,8 +551,8 @@ func addPidNS(config *CreateConfig, g *generate.Generator) error {
 	if pidMode.IsHost() {
 		return g.RemoveLinuxNamespace(string(spec.PIDNamespace))
 	}
-	if pidMode.IsContainer() {
-		logrus.Debug("using container pidmode")
+	if pidCtr := pidMode.Container(); pidCtr != "" {
+		logrus.Debugf("using container %s pidmode", pidCtr)
 	}
 	if IsPod(string(pidMode)) {
 		logrus.Debug("using pod pidmode")
@@ -579,8 +589,8 @@ func addNetNS(config *CreateConfig, g *generate.Generator) error {
 	} else if netMode.IsBridge() {
 		logrus.Debug("Using bridge netmode")
 		return nil
-	} else if netMode.IsContainer() {
-		logrus.Debug("Using container netmode")
+	} else if netCtr := netMode.Container(); netCtr != "" {
+		logrus.Debugf("using container %s netmode", netCtr)
 		return nil
 	} else if IsNS(string(netMode)) {
 		logrus.Debug("Using ns netmode")
@@ -606,6 +616,9 @@ func addUTSNS(config *CreateConfig, g *generate.Generator) error {
 	if utsMode.IsHost() {
 		return g.RemoveLinuxNamespace(string(spec.UTSNamespace))
 	}
+	if utsCtr := utsMode.Container(); utsCtr != "" {
+		logrus.Debugf("using container %s utsmode", utsCtr)
+	}
 	return nil
 }
 
@@ -617,8 +630,8 @@ func addIpcNS(config *CreateConfig, g *generate.Generator) error {
 	if ipcMode.IsHost() {
 		return g.RemoveLinuxNamespace(string(spec.IPCNamespace))
 	}
-	if ipcMode.IsContainer() {
-		logrus.Debug("Using container ipcmode")
+	if ipcCtr := ipcMode.Container(); ipcCtr != "" {
+		logrus.Debugf("Using container %s ipcmode", ipcCtr)
 	}
 
 	return nil
@@ -635,8 +648,8 @@ func addCgroupNS(config *CreateConfig, g *generate.Generator) error {
 	if cgroupMode.IsPrivate() {
 		return g.AddOrReplaceLinuxNamespace(string(spec.CgroupNamespace), "")
 	}
-	if cgroupMode.IsContainer() {
-		logrus.Debug("Using container cgroup mode")
+	if cgCtr := cgroupMode.Container(); cgCtr != "" {
+		logrus.Debugf("Using container %s cgroup mode", cgCtr)
 	}
 	return nil
 }