summaryrefslogtreecommitdiff
path: root/libpod/container_internal_linux.go
blob: ef86497761e0ab37bad69540e5b964d18a6e4be8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
//go:build linux
// +build linux

package libpod

import (
	"errors"
	"fmt"
	"os"
	"path"
	"path/filepath"
	"strings"
	"sync"
	"syscall"
	"time"

	"github.com/containernetworking/plugins/pkg/ns"
	"github.com/containers/common/libnetwork/types"
	"github.com/containers/common/pkg/cgroups"
	"github.com/containers/common/pkg/config"
	"github.com/containers/podman/v4/libpod/define"
	"github.com/containers/podman/v4/pkg/rootless"
	"github.com/containers/podman/v4/utils"
	spec "github.com/opencontainers/runtime-spec/specs-go"
	"github.com/opencontainers/runtime-tools/generate"
	"github.com/opencontainers/selinux/go-selinux/label"
	"github.com/sirupsen/logrus"
	"golang.org/x/sys/unix"
)

var (
	bindOptions = []string{"bind", "rprivate"}
)

func (c *Container) mountSHM(shmOptions string) error {
	if err := unix.Mount("shm", c.config.ShmDir, "tmpfs", unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV,
		label.FormatMountLabel(shmOptions, c.config.MountLabel)); err != nil {
		return fmt.Errorf("failed to mount shm tmpfs %q: %w", c.config.ShmDir, err)
	}
	return nil
}

func (c *Container) unmountSHM(mount string) error {
	if err := unix.Unmount(mount, 0); err != nil {
		if err != syscall.EINVAL && err != syscall.ENOENT {
			return fmt.Errorf("unmounting container %s SHM mount %s: %w", c.ID(), mount, err)
		}
		// If it's just an EINVAL or ENOENT, debug logs only
		logrus.Debugf("Container %s failed to unmount %s : %v", c.ID(), mount, err)
	}
	return nil
}

// prepare mounts the container and sets up other required resources like net
// namespaces
func (c *Container) prepare() error {
	var (
		wg                              sync.WaitGroup
		netNS                           ns.NetNS
		networkStatus                   map[string]types.StatusBlock
		createNetNSErr, mountStorageErr error
		mountPoint                      string
		tmpStateLock                    sync.Mutex
	)

	wg.Add(2)

	go func() {
		defer wg.Done()
		// Set up network namespace if not already set up
		noNetNS := c.state.NetNS == nil
		if c.config.CreateNetNS && noNetNS && !c.config.PostConfigureNetNS {
			netNS, networkStatus, createNetNSErr = c.runtime.createNetNS(c)
			if createNetNSErr != nil {
				return
			}

			tmpStateLock.Lock()
			defer tmpStateLock.Unlock()

			// Assign NetNS attributes to container
			c.state.NetNS = netNS
			c.state.NetworkStatus = networkStatus
		}
	}()
	// Mount storage if not mounted
	go func() {
		defer wg.Done()
		mountPoint, mountStorageErr = c.mountStorage()

		if mountStorageErr != nil {
			return
		}

		tmpStateLock.Lock()
		defer tmpStateLock.Unlock()

		// Finish up mountStorage
		c.state.Mounted = true
		c.state.Mountpoint = mountPoint

		logrus.Debugf("Created root filesystem for container %s at %s", c.ID(), c.state.Mountpoint)
	}()

	wg.Wait()

	var createErr error
	if createNetNSErr != nil {
		createErr = createNetNSErr
	}
	if mountStorageErr != nil {
		if createErr != nil {
			logrus.Errorf("Preparing container %s: %v", c.ID(), createErr)
		}
		createErr = mountStorageErr
	}

	// Only trigger storage cleanup if mountStorage was successful.
	// Otherwise, we may mess up mount counters.
	if createNetNSErr != nil && mountStorageErr == nil {
		if err := c.cleanupStorage(); err != nil {
			// createErr is guaranteed non-nil, so print
			// unconditionally
			logrus.Errorf("Preparing container %s: %v", c.ID(), createErr)
			createErr = fmt.Errorf("unmounting storage for container %s after network create failure: %w", c.ID(), err)
		}
	}

	// It's OK to unconditionally trigger network cleanup. If the network
	// isn't ready it will do nothing.
	if createErr != nil {
		if err := c.cleanupNetwork(); err != nil {
			logrus.Errorf("Preparing container %s: %v", c.ID(), createErr)
			createErr = fmt.Errorf("cleaning up container %s network after setup failure: %w", c.ID(), err)
		}
	}

	if createErr != nil {
		return createErr
	}

	// Save changes to container state
	if err := c.save(); err != nil {
		return err
	}

	return nil
}

// cleanupNetwork unmounts and cleans up the container's network
func (c *Container) cleanupNetwork() error {
	if c.config.NetNsCtr != "" {
		return nil
	}
	netDisabled, err := c.NetworkDisabled()
	if err != nil {
		return err
	}
	if netDisabled {
		return nil
	}
	if c.state.NetNS == nil {
		logrus.Debugf("Network is already cleaned up, skipping...")
		return nil
	}

	// Stop the container's network namespace (if it has one)
	if err := c.runtime.teardownNetNS(c); err != nil {
		logrus.Errorf("Unable to clean up network for container %s: %q", c.ID(), err)
	}

	c.state.NetNS = nil
	c.state.NetworkStatus = nil
	c.state.NetworkStatusOld = nil

	if c.valid {
		return c.save()
	}

	return nil
}

// reloadNetwork reloads the network for the given container, recreating
// firewall rules.
func (c *Container) reloadNetwork() error {
	result, err := c.runtime.reloadContainerNetwork(c)
	if err != nil {
		return err
	}

	c.state.NetworkStatus = result

	return c.save()
}

// systemd expects to have /run, /run/lock and /tmp on tmpfs
// It also expects to be able to write to /sys/fs/cgroup/systemd and /var/log/journal
func (c *Container) setupSystemd(mounts []spec.Mount, g generate.Generator) error {
	var containerUUIDSet bool
	for _, s := range c.config.Spec.Process.Env {
		if strings.HasPrefix(s, "container_uuid=") {
			containerUUIDSet = true
			break
		}
	}
	if !containerUUIDSet {
		g.AddProcessEnv("container_uuid", c.ID()[:32])
	}
	options := []string{"rw", "rprivate", "nosuid", "nodev"}
	for _, dest := range []string{"/run", "/run/lock"} {
		if MountExists(mounts, dest) {
			continue
		}
		tmpfsMnt := spec.Mount{
			Destination: dest,
			Type:        "tmpfs",
			Source:      "tmpfs",
			Options:     append(options, "tmpcopyup"),
		}
		g.AddMount(tmpfsMnt)
	}
	for _, dest := range []string{"/tmp", "/var/log/journal"} {
		if MountExists(mounts, dest) {
			continue
		}
		tmpfsMnt := spec.Mount{
			Destination: dest,
			Type:        "tmpfs",
			Source:      "tmpfs",
			Options:     append(options, "tmpcopyup"),
		}
		g.AddMount(tmpfsMnt)
	}

	unified, err := cgroups.IsCgroup2UnifiedMode()
	if err != nil {
		return err
	}

	if unified {
		g.RemoveMount("/sys/fs/cgroup")

		hasCgroupNs := false
		for _, ns := range c.config.Spec.Linux.Namespaces {
			if ns.Type == spec.CgroupNamespace {
				hasCgroupNs = true
				break
			}
		}

		var systemdMnt spec.Mount
		if hasCgroupNs {
			systemdMnt = spec.Mount{
				Destination: "/sys/fs/cgroup",
				Type:        "cgroup",
				Source:      "cgroup",
				Options:     []string{"private", "rw"},
			}
		} else {
			systemdMnt = spec.Mount{
				Destination: "/sys/fs/cgroup",
				Type:        "bind",
				Source:      "/sys/fs/cgroup",
				Options:     []string{"bind", "private", "rw"},
			}
		}
		g.AddMount(systemdMnt)
	} else {
		mountOptions := []string{"bind", "rprivate"}
		skipMount := false

		var statfs unix.Statfs_t
		if err := unix.Statfs("/sys/fs/cgroup/systemd", &statfs); err != nil {
			if errors.Is(err, os.ErrNotExist) {
				// If the mount is missing on the host, we cannot bind mount it so
				// just skip it.
				skipMount = true
			}
			mountOptions = append(mountOptions, "nodev", "noexec", "nosuid")
		} else {
			if statfs.Flags&unix.MS_NODEV == unix.MS_NODEV {
				mountOptions = append(mountOptions, "nodev")
			}
			if statfs.Flags&unix.MS_NOEXEC == unix.MS_NOEXEC {
				mountOptions = append(mountOptions, "noexec")
			}
			if statfs.Flags&unix.MS_NOSUID == unix.MS_NOSUID {
				mountOptions = append(mountOptions, "nosuid")
			}
			if statfs.Flags&unix.MS_RDONLY == unix.MS_RDONLY {
				mountOptions = append(mountOptions, "ro")
			}
		}
		if !skipMount {
			systemdMnt := spec.Mount{
				Destination: "/sys/fs/cgroup/systemd",
				Type:        "bind",
				Source:      "/sys/fs/cgroup/systemd",
				Options:     mountOptions,
			}
			g.AddMount(systemdMnt)
			g.AddLinuxMaskedPaths("/sys/fs/cgroup/systemd/release_agent")
		}
	}

	return nil
}

// Add an existing container's namespace to the spec
func (c *Container) addNamespaceContainer(g *generate.Generator, ns LinuxNS, ctr string, specNS spec.LinuxNamespaceType) error {
	nsCtr, err := c.runtime.state.Container(ctr)
	if err != nil {
		return fmt.Errorf("retrieving dependency %s of container %s from state: %w", ctr, c.ID(), err)
	}

	if specNS == spec.UTSNamespace {
		hostname := nsCtr.Hostname()
		// Joining an existing namespace, cannot set the hostname
		g.SetHostname("")
		g.AddProcessEnv("HOSTNAME", hostname)
	}

	nsPath, err := nsCtr.NamespacePath(ns)
	if err != nil {
		return err
	}

	if err := g.AddOrReplaceLinuxNamespace(string(specNS), nsPath); err != nil {
		return err
	}

	return nil
}

func isRootlessCgroupSet(cgroup string) bool {
	// old versions of podman were setting the CgroupParent to CgroupfsDefaultCgroupParent
	// by default.  Avoid breaking these versions and check whether the cgroup parent is
	// set to the default and in this case enable the old behavior.  It should not be a real
	// problem because the default CgroupParent is usually owned by root so rootless users
	// cannot access it.
	// This check might be lifted in a future version of Podman.
	// Check both that the cgroup or its parent is set to the default value (used by pods).
	return cgroup != CgroupfsDefaultCgroupParent && filepath.Dir(cgroup) != CgroupfsDefaultCgroupParent
}

func (c *Container) expectPodCgroup() (bool, error) {
	unified, err := cgroups.IsCgroup2UnifiedMode()
	if err != nil {
		return false, err
	}
	cgroupManager := c.CgroupManager()
	switch {
	case c.config.NoCgroups:
		return false, nil
	case cgroupManager == config.SystemdCgroupsManager:
		return !rootless.IsRootless() || unified, nil
	case cgroupManager == config.CgroupfsCgroupsManager:
		return !rootless.IsRootless(), nil
	default:
		return false, fmt.Errorf("invalid cgroup mode %s requested for pods: %w", cgroupManager, define.ErrInvalidArg)
	}
}

// Get cgroup path in a format suitable for the OCI spec
func (c *Container) getOCICgroupPath() (string, error) {
	unified, err := cgroups.IsCgroup2UnifiedMode()
	if err != nil {
		return "", err
	}
	cgroupManager := c.CgroupManager()
	switch {
	case c.config.NoCgroups:
		return "", nil
	case c.config.CgroupsMode == cgroupSplit:
		selfCgroup, err := utils.GetOwnCgroupDisallowRoot()
		if err != nil {
			return "", err
		}
		return filepath.Join(selfCgroup, fmt.Sprintf("libpod-payload-%s", c.ID())), nil
	case cgroupManager == config.SystemdCgroupsManager:
		// When the OCI runtime is set to use Systemd as a cgroup manager, it
		// expects cgroups to be passed as follows:
		// slice:prefix:name
		systemdCgroups := fmt.Sprintf("%s:libpod:%s", path.Base(c.config.CgroupParent), c.ID())
		logrus.Debugf("Setting Cgroups for container %s to %s", c.ID(), systemdCgroups)
		return systemdCgroups, nil
	case (rootless.IsRootless() && (cgroupManager == config.CgroupfsCgroupsManager || !unified)):
		if c.config.CgroupParent == "" || !isRootlessCgroupSet(c.config.CgroupParent) {
			return "", nil
		}
		fallthrough
	case cgroupManager == config.CgroupfsCgroupsManager:
		cgroupPath := filepath.Join(c.config.CgroupParent, fmt.Sprintf("libpod-%s", c.ID()))
		logrus.Debugf("Setting Cgroup path for container %s to %s", c.ID(), cgroupPath)
		return cgroupPath, nil
	default:
		return "", fmt.Errorf("invalid cgroup manager %s requested: %w", cgroupManager, define.ErrInvalidArg)
	}
}

// If the container is rootless, set up the slirp4netns network
func (c *Container) setupRootlessNetwork() error {
	// set up slirp4netns again because slirp4netns will die when conmon exits
	if c.config.NetMode.IsSlirp4netns() {
		err := c.runtime.setupSlirp4netns(c, c.state.NetNS)
		if err != nil {
			return err
		}
	}

	// set up rootlesskit port forwarder again since it dies when conmon exits
	// we use rootlesskit port forwarder only as rootless and when bridge network is used
	if rootless.IsRootless() && c.config.NetMode.IsBridge() && len(c.config.PortMappings) > 0 {
		err := c.runtime.setupRootlessPortMappingViaRLK(c, c.state.NetNS.Path(), c.state.NetworkStatus)
		if err != nil {
			return err
		}
	}
	return nil
}

func openDirectory(path string) (fd int, err error) {
	return unix.Open(path, unix.O_RDONLY|unix.O_PATH, 0)
}

func (c *Container) addNetworkNamespace(g *generate.Generator) error {
	if c.config.CreateNetNS {
		if c.config.PostConfigureNetNS {
			if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), ""); err != nil {
				return err
			}
		} else {
			if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), c.state.NetNS.Path()); err != nil {
				return err
			}
		}
	}
	return nil
}

func (c *Container) addSystemdMounts(g *generate.Generator) error {
	if c.Systemd() {
		if err := c.setupSystemd(g.Mounts(), *g); err != nil {
			return fmt.Errorf("adding systemd-specific mounts: %w", err)
		}
	}
	return nil
}

func (c *Container) addSharedNamespaces(g *generate.Generator) error {
	if c.config.IPCNsCtr != "" {
		if err := c.addNamespaceContainer(g, IPCNS, c.config.IPCNsCtr, spec.IPCNamespace); err != nil {
			return err
		}
	}
	if c.config.MountNsCtr != "" {
		if err := c.addNamespaceContainer(g, MountNS, c.config.MountNsCtr, spec.MountNamespace); err != nil {
			return err
		}
	}
	if c.config.NetNsCtr != "" {
		if err := c.addNamespaceContainer(g, NetNS, c.config.NetNsCtr, spec.NetworkNamespace); err != nil {
			return err
		}
	}
	if c.config.PIDNsCtr != "" {
		if err := c.addNamespaceContainer(g, PIDNS, c.config.PIDNsCtr, spec.PIDNamespace); err != nil {
			return err
		}
	}
	if c.config.UserNsCtr != "" {
		if err := c.addNamespaceContainer(g, UserNS, c.config.UserNsCtr, spec.UserNamespace); err != nil {
			return err
		}
		if len(g.Config.Linux.UIDMappings) == 0 {
			// runc complains if no mapping is specified, even if we join another ns.  So provide a dummy mapping
			g.AddLinuxUIDMapping(uint32(0), uint32(0), uint32(1))
			g.AddLinuxGIDMapping(uint32(0), uint32(0), uint32(1))
		}
	}

	availableUIDs, availableGIDs, err := rootless.GetAvailableIDMaps()
	if err != nil {
		if os.IsNotExist(err) {
			// The kernel-provided files only exist if user namespaces are supported
			logrus.Debugf("User or group ID mappings not available: %s", err)
		} else {
			return err
		}
	} else {
		g.Config.Linux.UIDMappings = rootless.MaybeSplitMappings(g.Config.Linux.UIDMappings, availableUIDs)
		g.Config.Linux.GIDMappings = rootless.MaybeSplitMappings(g.Config.Linux.GIDMappings, availableGIDs)
	}

	// Hostname handling:
	// If we have a UTS namespace, set Hostname in the OCI spec.
	// Set the HOSTNAME environment variable unless explicitly overridden by
	// the user (already present in OCI spec). If we don't have a UTS ns,
	// set it to the host's hostname instead.
	hostname := c.Hostname()
	foundUTS := false

	for _, i := range c.config.Spec.Linux.Namespaces {
		if i.Type == spec.UTSNamespace && i.Path == "" {
			foundUTS = true
			g.SetHostname(hostname)
			break
		}
	}
	if !foundUTS {
		tmpHostname, err := os.Hostname()
		if err != nil {
			return err
		}
		hostname = tmpHostname
	}
	needEnv := true
	for _, checkEnv := range g.Config.Process.Env {
		if strings.SplitN(checkEnv, "=", 2)[0] == "HOSTNAME" {
			needEnv = false
			break
		}
	}
	if needEnv {
		g.AddProcessEnv("HOSTNAME", hostname)
	}

	if c.config.UTSNsCtr != "" {
		if err := c.addNamespaceContainer(g, UTSNS, c.config.UTSNsCtr, spec.UTSNamespace); err != nil {
			return err
		}
	}
	if c.config.CgroupNsCtr != "" {
		if err := c.addNamespaceContainer(g, CgroupNS, c.config.CgroupNsCtr, spec.CgroupNamespace); err != nil {
			return err
		}
	}

	if c.config.UserNsCtr == "" && c.config.IDMappings.AutoUserNs {
		if err := g.AddOrReplaceLinuxNamespace(string(spec.UserNamespace), ""); err != nil {
			return err
		}
		g.ClearLinuxUIDMappings()
		for _, uidmap := range c.config.IDMappings.UIDMap {
			g.AddLinuxUIDMapping(uint32(uidmap.HostID), uint32(uidmap.ContainerID), uint32(uidmap.Size))
		}
		g.ClearLinuxGIDMappings()
		for _, gidmap := range c.config.IDMappings.GIDMap {
			g.AddLinuxGIDMapping(uint32(gidmap.HostID), uint32(gidmap.ContainerID), uint32(gidmap.Size))
		}
	}
	return nil
}

func (c *Container) addRootPropagation(g *generate.Generator, mounts []spec.Mount) error {
	// Determine property of RootPropagation based on volume properties. If
	// a volume is shared, then keep root propagation shared. This should
	// work for slave and private volumes too.
	//
	// For slave volumes, it can be either [r]shared/[r]slave.
	//
	// For private volumes any root propagation value should work.
	rootPropagation := ""
	for _, m := range mounts {
		for _, opt := range m.Options {
			switch opt {
			case MountShared, MountRShared:
				if rootPropagation != MountShared && rootPropagation != MountRShared {
					rootPropagation = MountShared
				}
			case MountSlave, MountRSlave:
				if rootPropagation != MountShared && rootPropagation != MountRShared && rootPropagation != MountSlave && rootPropagation != MountRSlave {
					rootPropagation = MountRSlave
				}
			}
		}
	}
	if rootPropagation != "" {
		logrus.Debugf("Set root propagation to %q", rootPropagation)
		if err := g.SetLinuxRootPropagation(rootPropagation); err != nil {
			return err
		}
	}
	return nil
}

func (c *Container) setProcessLabel(g *generate.Generator) {
	g.SetProcessSelinuxLabel(c.ProcessLabel())
}

func (c *Container) setMountLabel(g *generate.Generator) {
	g.SetLinuxMountLabel(c.MountLabel())
}

func (c *Container) setCgroupsPath(g *generate.Generator) error {
	cgroupPath, err := c.getOCICgroupPath()
	if err != nil {
		return err
	}
	g.SetLinuxCgroupsPath(cgroupPath)
	return nil
}

func (c *Container) addSlirp4netnsDNS(nameservers []string) []string {
	// slirp4netns has a built in DNS forwarder.
	if c.config.NetMode.IsSlirp4netns() {
		slirp4netnsDNS, err := GetSlirp4netnsDNS(c.slirp4netnsSubnet)
		if err != nil {
			logrus.Warn("Failed to determine Slirp4netns DNS: ", err.Error())
		} else {
			nameservers = append(nameservers, slirp4netnsDNS.String())
		}
	}
	return nameservers
}

func (c *Container) isSlirp4netnsIPv6() (bool, error) {
	if c.config.NetMode.IsSlirp4netns() {
		ctrNetworkSlipOpts := []string{}
		if c.config.NetworkOptions != nil {
			ctrNetworkSlipOpts = append(ctrNetworkSlipOpts, c.config.NetworkOptions["slirp4netns"]...)
		}
		slirpOpts, err := parseSlirp4netnsNetworkOptions(c.runtime, ctrNetworkSlipOpts)
		if err != nil {
			return false, err
		}
		return slirpOpts.enableIPv6, nil
	}

	return false, nil
}

// check for net=none
func (c *Container) hasNetNone() bool {
	if !c.config.CreateNetNS {
		for _, ns := range c.config.Spec.Linux.Namespaces {
			if ns.Type == spec.NetworkNamespace {
				if ns.Path == "" {
					return true
				}
			}
		}
	}
	return false
}

func setVolumeAtime(mountPoint string, st os.FileInfo) error {
	stat := st.Sys().(*syscall.Stat_t)
	atime := time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec)) //nolint: unconvert
	if err := os.Chtimes(mountPoint, atime, st.ModTime()); err != nil {
		return err
	}
	return nil
}

func (c *Container) makePlatformBindMounts() error {
	// Make /etc/hostname
	// This should never change, so no need to recreate if it exists
	if _, ok := c.state.BindMounts["/etc/hostname"]; !ok {
		hostnamePath, err := c.writeStringToRundir("hostname", c.Hostname())
		if err != nil {
			return fmt.Errorf("creating hostname file for container %s: %w", c.ID(), err)
		}
		c.state.BindMounts["/etc/hostname"] = hostnamePath
	}
	return nil
}