1 files changed, 160 insertions, 0 deletions
diff --git a/pkg/specgen/generate/namespaces_linux.go b/pkg/specgen/generate/namespaces_linux.go
new file mode 100644
index 000000000..5c056e52c
--- /dev/null
+++ b/pkg/specgen/generate/namespaces_linux.go
@@ -0,0 +1,160 @@
+package generate
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/containers/podman/v4/libpod"
+	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/specgen"
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/runtime-tools/generate"
+	"github.com/sirupsen/logrus"
+)
+
+func specConfigureNamespaces(s *specgen.SpecGenerator, g *generate.Generator, rt *libpod.Runtime, pod *libpod.Pod) error {
+	// PID
+	switch s.PidNS.NSMode {
+	case specgen.Path:
+		if _, err := os.Stat(s.PidNS.Value); err != nil {
+			return fmt.Errorf("cannot find specified PID namespace path: %w", err)
+		}
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.PIDNamespace), s.PidNS.Value); err != nil {
+			return err
+		}
+	case specgen.Host:
+		if err := g.RemoveLinuxNamespace(string(spec.PIDNamespace)); err != nil {
+			return err
+		}
+	case specgen.Private:
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.PIDNamespace), ""); err != nil {
+			return err
+		}
+	}
+
+	// IPC
+	switch s.IpcNS.NSMode {
+	case specgen.Path:
+		if _, err := os.Stat(s.IpcNS.Value); err != nil {
+			return fmt.Errorf("cannot find specified IPC namespace path: %w", err)
+		}
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.IPCNamespace), s.IpcNS.Value); err != nil {
+			return err
+		}
+	case specgen.Host:
+		if err := g.RemoveLinuxNamespace(string(spec.IPCNamespace)); err != nil {
+			return err
+		}
+	case specgen.Private:
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.IPCNamespace), ""); err != nil {
+			return err
+		}
+	}
+
+	// UTS
+	switch s.UtsNS.NSMode {
+	case specgen.Path:
+		if _, err := os.Stat(s.UtsNS.Value); err != nil {
+			return fmt.Errorf("cannot find specified UTS namespace path: %w", err)
+		}
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.UTSNamespace), s.UtsNS.Value); err != nil {
+			return err
+		}
+	case specgen.Host:
+		if err := g.RemoveLinuxNamespace(string(spec.UTSNamespace)); err != nil {
+			return err
+		}
+	case specgen.Private:
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.UTSNamespace), ""); err != nil {
+			return err
+		}
+	}
+
+	hostname := s.Hostname
+	if hostname == "" {
+		switch {
+		case s.UtsNS.NSMode == specgen.FromPod:
+			hostname = pod.Hostname()
+		case s.UtsNS.NSMode == specgen.FromContainer:
+			utsCtr, err := rt.LookupContainer(s.UtsNS.Value)
+			if err != nil {
+				return fmt.Errorf("error looking up container to share uts namespace with: %w", err)
+			}
+			hostname = utsCtr.Hostname()
+		case (s.NetNS.NSMode == specgen.Host && hostname == "") || s.UtsNS.NSMode == specgen.Host:
+			tmpHostname, err := os.Hostname()
+			if err != nil {
+				return fmt.Errorf("unable to retrieve hostname of the host: %w", err)
+			}
+			hostname = tmpHostname
+		default:
+			logrus.Debug("No hostname set; container's hostname will default to runtime default")
+		}
+	}
+
+	g.RemoveHostname()
+	if s.Hostname != "" || s.UtsNS.NSMode != specgen.Host {
+		// Set the hostname in the OCI configuration only if specified by
+		// the user or if we are creating a new UTS namespace.
+		// TODO: Should we be doing this for pod or container shared
+		// namespaces?
+		g.SetHostname(hostname)
+	}
+	if _, ok := s.Env["HOSTNAME"]; !ok && s.Hostname != "" {
+		g.AddProcessEnv("HOSTNAME", hostname)
+	}
+
+	// User
+	if _, err := specgen.SetupUserNS(s.IDMappings, s.UserNS, g); err != nil {
+		return err
+	}
+
+	// Cgroup
+	switch s.CgroupNS.NSMode {
+	case specgen.Path:
+		if _, err := os.Stat(s.CgroupNS.Value); err != nil {
+			return fmt.Errorf("cannot find specified cgroup namespace path: %w", err)
+		}
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.CgroupNamespace), s.CgroupNS.Value); err != nil {
+			return err
+		}
+	case specgen.Host:
+		if err := g.RemoveLinuxNamespace(string(spec.CgroupNamespace)); err != nil {
+			return err
+		}
+	case specgen.Private:
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.CgroupNamespace), ""); err != nil {
+			return err
+		}
+	}
+
+	// Net
+	switch s.NetNS.NSMode {
+	case specgen.Path:
+		if _, err := os.Stat(s.NetNS.Value); err != nil {
+			return fmt.Errorf("cannot find specified network namespace path: %w", err)
+		}
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), s.NetNS.Value); err != nil {
+			return err
+		}
+	case specgen.Host:
+		if err := g.RemoveLinuxNamespace(string(spec.NetworkNamespace)); err != nil {
+			return err
+		}
+	case specgen.Private, specgen.NoNetwork:
+		if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), ""); err != nil {
+			return err
+		}
+	}
+
+	if g.Config.Annotations == nil {
+		g.Config.Annotations = make(map[string]string)
+	}
+	if s.PublishExposedPorts {
+		g.Config.Annotations[define.InspectAnnotationPublishAll] = define.InspectResponseTrue
+	} else {
+		g.Config.Annotations[define.InspectAnnotationPublishAll] = define.InspectResponseFalse
+	}
+
+	return nil
+}