Merge pull request #6504 from rhatdan/systemd

Fix handling of systemd.

cmd/podman/common/create.go

@@ -424,7 +424,7 @@ func GetCreateFlags(cf *ContainerCLIOpts) *pflag.FlagSet {
 		"Sysctl options",
 	)
 	createFlags.StringVar(
-		&cf.SystemdD,
+		&cf.Systemd,
 		"systemd", "true",
 		`Run container in systemd mode ("true"|"false"|"always")`,
 	)

cmd/podman/common/create_opts.go

@@ -85,7 +85,7 @@ type ContainerCLIOpts struct {
 	SubUIDName        string
 	SubGIDName        string
 	Sysctl            []string
-	SystemdD          string
+	Systemd           string
 	TmpFS             []string
 	TTY               bool
 	UIDMap            []string

cmd/podman/common/specgen.go

@@ -3,7 +3,6 @@ package common
 import (
 	"fmt"
 	"os"
-	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -285,16 +284,13 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 		s.NetNS = c.Net.Network
 	}
 
-	// STOP SIGNAL
-	signalString := "TERM"
 	if sig := c.StopSignal; len(sig) > 0 {
-		signalString = sig
+		stopSignal, err := util.ParseSignal(sig)
+		if err != nil {
+			return err
+		}
+		s.StopSignal = &stopSignal
 	}
-	stopSignal, err := util.ParseSignal(signalString)
-	if err != nil {
-		return err
-	}
-	s.StopSignal = &stopSignal
 
 	// ENVIRONMENT VARIABLES
 	//
@@ -439,25 +435,7 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 		s.ImageVolumeMode = "anonymous"
 	}
 
-	systemd := c.SystemdD == "always"
+	s.Systemd = c.Systemd
-	if !systemd && command != nil {
-		x, err := strconv.ParseBool(c.SystemdD)
-		if err != nil {
-			return errors.Wrapf(err, "cannot parse bool %s", c.SystemdD)
-		}
-		if x && (command[0] == "/usr/sbin/init" || command[0] == "/sbin/init" || (filepath.Base(command[0]) == "systemd")) {
-			systemd = true
-		}
-	}
-	if systemd {
-		if s.StopSignal == nil {
-			stopSignal, err = util.ParseSignal("RTMIN+3")
-			if err != nil {
-				return errors.Wrapf(err, "error parsing systemd signal")
-			}
-			s.StopSignal = &stopSignal
-		}
-	}
 	if s.ResourceLimits == nil {
 		s.ResourceLimits = &specs.LinuxResources{}
 	}

pkg/specgen/container_validate.go

@@ -38,7 +38,7 @@ func (s *SpecGenerator) Validate() error {
 	}
 	// systemd values must be true, false, or always
 	if len(s.ContainerBasicConfig.Systemd) > 0 && !util.StringInSlice(strings.ToLower(s.ContainerBasicConfig.Systemd), SystemDValues) {
-		return errors.Wrapf(ErrInvalidSpecConfig, "SystemD values must be one of %s", strings.Join(SystemDValues, ","))
+		return errors.Wrapf(ErrInvalidSpecConfig, "--systemd values must be one of %q", strings.Join(SystemDValues, ", "))
 	}
 
 	//

pkg/specgen/generate/container_create.go

@@ -3,12 +3,14 @@ package generate
 import (
 	"context"
 	"os"
+	"path/filepath"
 
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/specgen"
+	"github.com/containers/libpod/pkg/util"
 	"github.com/containers/storage"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -128,7 +130,41 @@ func createContainerOptions(ctx context.Context, rt *libpod.Runtime, s *specgen.
 	if s.Stdin {
 		options = append(options, libpod.WithStdin())
 	}
-	if len(s.Systemd) > 0 {
+
+	useSystemd := false
+	switch s.Systemd {
+	case "always":
+		useSystemd = true
+	case "false":
+		break
+	case "", "true":
+		command := s.Command
+		if len(command) == 0 {
+			command, err = img.Cmd(ctx)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if len(command) > 0 {
+			if command[0] == "/usr/sbin/init" || command[0] == "/sbin/init" || (filepath.Base(command[0]) == "systemd") {
+				useSystemd = true
+			}
+		}
+	default:
+		return nil, errors.Wrapf(err, "invalid value %q systemd option requires 'true, false, always'", s.Systemd)
+	}
+	if useSystemd {
+		// is StopSignal was not set by the user then set it to systemd
+		// expected StopSigal
+		if s.StopSignal == nil {
+			stopSignal, err := util.ParseSignal("RTMIN+3")
+			if err != nil {
+				return nil, errors.Wrapf(err, "error parsing systemd signal")
+			}
+			s.StopSignal = &stopSignal
+		}
+
 		options = append(options, libpod.WithSystemd())
 	}
 	if len(s.Name) > 0 {

test/e2e/systemd_test.go

@@ -8,7 +8,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/containers/libpod/pkg/cgroups"
 	. "github.com/containers/libpod/test/utils"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -82,13 +81,6 @@ WantedBy=multi-user.target
 	})
 
 	It("podman run container with systemd PID1", func() {
-		cgroupsv2, err := cgroups.IsCgroup2UnifiedMode()
-		Expect(err).To(BeNil())
-		if cgroupsv2 {
-			// TODO: Find a way to enable this for v2
-			Skip("systemd test does not work in cgroups V2 mode yet")
-		}
-
 		systemdImage := "fedora"
 		pull := podmanTest.Podman([]string{"pull", systemdImage})
 		pull.WaitWithDefaultTimeout()