specgen/generate: Move SpecGenToOCI, WeightDevices to oci_linux.go and add stubs.

Almost all of SpecGenToOCI deals with linux-specific aspects of the
runtime spec. Rather than try to factor this out piecemeal, I think it
is cleaner to move the whole function along with its implementation
helper functions. This also meams we don't need non-linux stubs for
functions called from oci_linux.go

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

4 files changed, 355 insertions, 346 deletions

diff --git a/pkg/specgen/generate/config_unsupported.go b/pkg/specgen/generate/config_unsupported.go
deleted file mode 100644
index a97ae0709..000000000
--- a/pkg/specgen/generate/config_unsupported.go
+++ /dev/null
@@ -1,29 +0,0 @@
-//go:build !linux
-// +build !linux
-
-package generate
-
-import (
-	"errors"
-
-	"github.com/containers/common/libimage"
-	"github.com/containers/podman/v4/pkg/specgen"
-	spec "github.com/opencontainers/runtime-spec/specs-go"
-	"github.com/opencontainers/runtime-tools/generate"
-)
-
-// DevicesFromPath computes a list of devices
-func DevicesFromPath(g *generate.Generator, devicePath string) error {
-	return errors.New("unsupported DevicesFromPath")
-}
-
-func BlockAccessToKernelFilesystems(privileged, pidModeIsHost bool, mask, unmask []string, g *generate.Generator) {
-}
-
-func supportAmbientCapabilities() bool {
-	return false
-}
-
-func getSeccompConfig(s *specgen.SpecGenerator, configSpec *spec.Spec, img *libimage.Image) (*spec.LinuxSeccomp, error) {
-	return nil, errors.New("not implemented getSeccompConfig")
-}
diff --git a/pkg/specgen/generate/oci.go b/pkg/specgen/generate/oci.go
index a531494c9..3ac1a9b3f 100644
--- a/pkg/specgen/generate/oci.go
+++ b/pkg/specgen/generate/oci.go
@@ -1,37 +1,19 @@
 package generate
 
 import (
-	"context"
-	"encoding/json"
 	"fmt"
-	"path"
 	"strings"
 
 	"github.com/containers/common/libimage"
-	"github.com/containers/common/pkg/cgroups"
 	"github.com/containers/common/pkg/config"
-	"github.com/containers/podman/v4/libpod"
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/pkg/rootless"
 	"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"
 	"golang.org/x/sys/unix"
 )
 
-func setProcOpts(s *specgen.SpecGenerator, g *generate.Generator) {
-	if s.ProcOpts == nil {
-		return
-	}
-	for i := range g.Config.Mounts {
-		if g.Config.Mounts[i].Destination == "/proc" {
-			g.Config.Mounts[i].Options = s.ProcOpts
-			return
-		}
-	}
-}
-
 func addRlimits(s *specgen.SpecGenerator, g *generate.Generator) {
 	var (
 		isRootless = rootless.IsRootless()
@@ -133,302 +115,3 @@ func makeCommand(s *specgen.SpecGenerator, imageData *libimage.ImageData, rtc *c
 
 	return finalCommand, nil
 }
-
-// canMountSys is a best-effort heuristic to detect whether mounting a new sysfs is permitted in the container
-func canMountSys(isRootless, isNewUserns bool, s *specgen.SpecGenerator) bool {
-	if s.NetNS.IsHost() && (isRootless || isNewUserns) {
-		return false
-	}
-	if isNewUserns {
-		switch s.NetNS.NSMode {
-		case specgen.Slirp, specgen.Private, specgen.NoNetwork, specgen.Bridge:
-			return true
-		default:
-			return false
-		}
-	}
-	return true
-}
-
-func getCgroupPermissons(unmask []string) string {
-	ro := "ro"
-	rw := "rw"
-	cgroup := "/sys/fs/cgroup"
-
-	cgroupv2, _ := cgroups.IsCgroup2UnifiedMode()
-	if !cgroupv2 {
-		return ro
-	}
-
-	if unmask != nil && unmask[0] == "ALL" {
-		return rw
-	}
-
-	for _, p := range unmask {
-		if path.Clean(p) == cgroup {
-			return rw
-		}
-	}
-	return ro
-}
-
-// SpecGenToOCI returns the base configuration for the container.
-func SpecGenToOCI(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.Runtime, rtc *config.Config, newImage *libimage.Image, mounts []spec.Mount, pod *libpod.Pod, finalCmd []string, compatibleOptions *libpod.InfraInherit) (*spec.Spec, error) {
-	cgroupPerm := getCgroupPermissons(s.Unmask)
-
-	g, err := generate.New("linux")
-	if err != nil {
-		return nil, err
-	}
-	// Remove the default /dev/shm mount to ensure we overwrite it
-	g.RemoveMount("/dev/shm")
-	g.HostSpecific = true
-	addCgroup := true
-
-	isRootless := rootless.IsRootless()
-	isNewUserns := s.UserNS.IsContainer() || s.UserNS.IsPath() || s.UserNS.IsPrivate()
-
-	canMountSys := canMountSys(isRootless, isNewUserns, s)
-
-	if s.Privileged && canMountSys {
-		cgroupPerm = "rw"
-		g.RemoveMount("/sys")
-		sysMnt := spec.Mount{
-			Destination: "/sys",
-			Type:        "sysfs",
-			Source:      "sysfs",
-			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", "rw"},
-		}
-		g.AddMount(sysMnt)
-	}
-	if !canMountSys {
-		addCgroup = false
-		g.RemoveMount("/sys")
-		r := "ro"
-		if s.Privileged {
-			r = "rw"
-		}
-		sysMnt := spec.Mount{
-			Destination: "/sys",
-			Type:        "bind", // should we use a constant for this, like createconfig?
-			Source:      "/sys",
-			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", r, "rbind"},
-		}
-		g.AddMount(sysMnt)
-		if !s.Privileged && isRootless {
-			g.AddLinuxMaskedPaths("/sys/kernel")
-		}
-	}
-	gid5Available := true
-	if isRootless {
-		nGids, err := rootless.GetAvailableGids()
-		if err != nil {
-			return nil, err
-		}
-		gid5Available = nGids >= 5
-	}
-	// When using a different user namespace, check that the GID 5 is mapped inside
-	// the container.
-	if gid5Available && (s.IDMappings != nil && len(s.IDMappings.GIDMap) > 0) {
-		mappingFound := false
-		for _, r := range s.IDMappings.GIDMap {
-			if r.ContainerID <= 5 && 5 < r.ContainerID+r.Size {
-				mappingFound = true
-				break
-			}
-		}
-		if !mappingFound {
-			gid5Available = false
-		}
-	}
-	if !gid5Available {
-		// If we have no GID mappings, the gid=5 default option would fail, so drop it.
-		g.RemoveMount("/dev/pts")
-		devPts := spec.Mount{
-			Destination: "/dev/pts",
-			Type:        "devpts",
-			Source:      "devpts",
-			Options:     []string{"rprivate", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
-		}
-		g.AddMount(devPts)
-	}
-
-	inUserNS := isRootless || isNewUserns
-
-	if inUserNS && s.IpcNS.IsHost() {
-		g.RemoveMount("/dev/mqueue")
-		devMqueue := spec.Mount{
-			Destination: "/dev/mqueue",
-			Type:        "bind", // constant ?
-			Source:      "/dev/mqueue",
-			Options:     []string{"bind", "nosuid", "noexec", "nodev"},
-		}
-		g.AddMount(devMqueue)
-	}
-	if inUserNS && s.PidNS.IsHost() {
-		g.RemoveMount("/proc")
-		procMount := spec.Mount{
-			Destination: "/proc",
-			Type:        define.TypeBind,
-			Source:      "/proc",
-			Options:     []string{"rbind", "nosuid", "noexec", "nodev"},
-		}
-		g.AddMount(procMount)
-	}
-
-	if addCgroup {
-		cgroupMnt := spec.Mount{
-			Destination: "/sys/fs/cgroup",
-			Type:        "cgroup",
-			Source:      "cgroup",
-			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", "relatime", cgroupPerm},
-		}
-		g.AddMount(cgroupMnt)
-	}
-
-	g.Config.Linux.Personality = s.Personality
-
-	g.SetProcessCwd(s.WorkDir)
-
-	g.SetProcessArgs(finalCmd)
-
-	g.SetProcessTerminal(s.Terminal)
-
-	for key, val := range s.Annotations {
-		g.AddAnnotation(key, val)
-	}
-
-	if s.ResourceLimits != nil {
-		out, err := json.Marshal(s.ResourceLimits)
-		if err != nil {
-			return nil, err
-		}
-		err = json.Unmarshal(out, g.Config.Linux.Resources)
-		if err != nil {
-			return nil, err
-		}
-		g.Config.Linux.Resources = s.ResourceLimits
-	}
-
-	weightDevices, err := WeightDevices(s.WeightDevice)
-	if err != nil {
-		return nil, err
-	}
-	if len(weightDevices) > 0 {
-		for _, dev := range weightDevices {
-			g.AddLinuxResourcesBlockIOWeightDevice(dev.Major, dev.Minor, *dev.Weight)
-		}
-	}
-
-	// Devices
-	// set the default rule at the beginning of device configuration
-	if !inUserNS && !s.Privileged {
-		g.AddLinuxResourcesDevice(false, "", nil, nil, "rwm")
-	}
-
-	var userDevices []spec.LinuxDevice
-
-	if !s.Privileged {
-		// add default devices from containers.conf
-		for _, device := range rtc.Containers.Devices {
-			if err = DevicesFromPath(&g, device); err != nil {
-				return nil, err
-			}
-		}
-		if len(compatibleOptions.HostDeviceList) > 0 && len(s.Devices) == 0 {
-			userDevices = compatibleOptions.HostDeviceList
-		} else {
-			userDevices = s.Devices
-		}
-		// add default devices specified by caller
-		for _, device := range userDevices {
-			if err = DevicesFromPath(&g, device.Path); err != nil {
-				return nil, err
-			}
-		}
-	}
-	s.HostDeviceList = userDevices
-
-	// set the devices cgroup when not running in a user namespace
-	if !inUserNS && !s.Privileged {
-		for _, dev := range s.DeviceCgroupRule {
-			g.AddLinuxResourcesDevice(true, dev.Type, dev.Major, dev.Minor, dev.Access)
-		}
-	}
-
-	BlockAccessToKernelFilesystems(s.Privileged, s.PidNS.IsHost(), s.Mask, s.Unmask, &g)
-
-	g.ClearProcessEnv()
-	for name, val := range s.Env {
-		g.AddProcessEnv(name, val)
-	}
-
-	addRlimits(s, &g)
-
-	// NAMESPACES
-	if err := specConfigureNamespaces(s, &g, rt, pod); err != nil {
-		return nil, err
-	}
-	configSpec := g.Config
-
-	if err := securityConfigureGenerator(s, &g, newImage, rtc); err != nil {
-		return nil, err
-	}
-
-	// BIND MOUNTS
-	configSpec.Mounts = SupersedeUserMounts(mounts, configSpec.Mounts)
-	// Process mounts to ensure correct options
-	if err := InitFSMounts(configSpec.Mounts); err != nil {
-		return nil, err
-	}
-
-	// Add annotations
-	if configSpec.Annotations == nil {
-		configSpec.Annotations = make(map[string]string)
-	}
-
-	if s.Remove {
-		configSpec.Annotations[define.InspectAnnotationAutoremove] = define.InspectResponseTrue
-	} else {
-		configSpec.Annotations[define.InspectAnnotationAutoremove] = define.InspectResponseFalse
-	}
-
-	if len(s.VolumesFrom) > 0 {
-		configSpec.Annotations[define.InspectAnnotationVolumesFrom] = strings.Join(s.VolumesFrom, ",")
-	}
-
-	if s.Privileged {
-		configSpec.Annotations[define.InspectAnnotationPrivileged] = define.InspectResponseTrue
-	} else {
-		configSpec.Annotations[define.InspectAnnotationPrivileged] = define.InspectResponseFalse
-	}
-
-	if s.Init {
-		configSpec.Annotations[define.InspectAnnotationInit] = define.InspectResponseTrue
-	} else {
-		configSpec.Annotations[define.InspectAnnotationInit] = define.InspectResponseFalse
-	}
-
-	if s.OOMScoreAdj != nil {
-		g.SetProcessOOMScoreAdj(*s.OOMScoreAdj)
-	}
-	setProcOpts(s, &g)
-
-	return configSpec, nil
-}
-
-func WeightDevices(wtDevices map[string]spec.LinuxWeightDevice) ([]spec.LinuxWeightDevice, error) {
-	devs := []spec.LinuxWeightDevice{}
-	for k, v := range wtDevices {
-		statT := unix.Stat_t{}
-		if err := unix.Stat(k, &statT); err != nil {
-			return nil, fmt.Errorf("failed to inspect '%s' in --blkio-weight-device: %w", k, err)
-		}
-		dev := new(spec.LinuxWeightDevice)
-		dev.Major = (int64(unix.Major(uint64(statT.Rdev)))) //nolint: unconvert
-		dev.Minor = (int64(unix.Minor(uint64(statT.Rdev)))) //nolint: unconvert
-		dev.Weight = v.Weight
-		devs = append(devs, *dev)
-	}
-	return devs, nil
-}
diff --git a/pkg/specgen/generate/oci_linux.go b/pkg/specgen/generate/oci_linux.go
new file mode 100644
index 000000000..341853de5
--- /dev/null
+++ b/pkg/specgen/generate/oci_linux.go
@@ -0,0 +1,331 @@
+package generate
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"path"
+	"strings"
+
+	"github.com/containers/common/libimage"
+	"github.com/containers/common/pkg/cgroups"
+	"github.com/containers/common/pkg/config"
+	"github.com/containers/podman/v4/libpod"
+	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/rootless"
+	"github.com/containers/podman/v4/pkg/specgen"
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/runtime-tools/generate"
+	"golang.org/x/sys/unix"
+)
+
+func setProcOpts(s *specgen.SpecGenerator, g *generate.Generator) {
+	if s.ProcOpts == nil {
+		return
+	}
+	for i := range g.Config.Mounts {
+		if g.Config.Mounts[i].Destination == "/proc" {
+			g.Config.Mounts[i].Options = s.ProcOpts
+			return
+		}
+	}
+}
+
+// canMountSys is a best-effort heuristic to detect whether mounting a new sysfs is permitted in the container
+func canMountSys(isRootless, isNewUserns bool, s *specgen.SpecGenerator) bool {
+	if s.NetNS.IsHost() && (isRootless || isNewUserns) {
+		return false
+	}
+	if isNewUserns {
+		switch s.NetNS.NSMode {
+		case specgen.Slirp, specgen.Private, specgen.NoNetwork, specgen.Bridge:
+			return true
+		default:
+			return false
+		}
+	}
+	return true
+}
+
+func getCgroupPermissons(unmask []string) string {
+	ro := "ro"
+	rw := "rw"
+	cgroup := "/sys/fs/cgroup"
+
+	cgroupv2, _ := cgroups.IsCgroup2UnifiedMode()
+	if !cgroupv2 {
+		return ro
+	}
+
+	if unmask != nil && unmask[0] == "ALL" {
+		return rw
+	}
+
+	for _, p := range unmask {
+		if path.Clean(p) == cgroup {
+			return rw
+		}
+	}
+	return ro
+}
+
+// SpecGenToOCI returns the base configuration for the container.
+func SpecGenToOCI(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.Runtime, rtc *config.Config, newImage *libimage.Image, mounts []spec.Mount, pod *libpod.Pod, finalCmd []string, compatibleOptions *libpod.InfraInherit) (*spec.Spec, error) {
+	cgroupPerm := getCgroupPermissons(s.Unmask)
+
+	g, err := generate.New("linux")
+	if err != nil {
+		return nil, err
+	}
+	// Remove the default /dev/shm mount to ensure we overwrite it
+	g.RemoveMount("/dev/shm")
+	g.HostSpecific = true
+	addCgroup := true
+
+	isRootless := rootless.IsRootless()
+	isNewUserns := s.UserNS.IsContainer() || s.UserNS.IsPath() || s.UserNS.IsPrivate()
+
+	canMountSys := canMountSys(isRootless, isNewUserns, s)
+
+	if s.Privileged && canMountSys {
+		cgroupPerm = "rw"
+		g.RemoveMount("/sys")
+		sysMnt := spec.Mount{
+			Destination: "/sys",
+			Type:        "sysfs",
+			Source:      "sysfs",
+			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", "rw"},
+		}
+		g.AddMount(sysMnt)
+	}
+	if !canMountSys {
+		addCgroup = false
+		g.RemoveMount("/sys")
+		r := "ro"
+		if s.Privileged {
+			r = "rw"
+		}
+		sysMnt := spec.Mount{
+			Destination: "/sys",
+			Type:        "bind", // should we use a constant for this, like createconfig?
+			Source:      "/sys",
+			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", r, "rbind"},
+		}
+		g.AddMount(sysMnt)
+		if !s.Privileged && isRootless {
+			g.AddLinuxMaskedPaths("/sys/kernel")
+		}
+	}
+	gid5Available := true
+	if isRootless {
+		nGids, err := rootless.GetAvailableGids()
+		if err != nil {
+			return nil, err
+		}
+		gid5Available = nGids >= 5
+	}
+	// When using a different user namespace, check that the GID 5 is mapped inside
+	// the container.
+	if gid5Available && (s.IDMappings != nil && len(s.IDMappings.GIDMap) > 0) {
+		mappingFound := false
+		for _, r := range s.IDMappings.GIDMap {
+			if r.ContainerID <= 5 && 5 < r.ContainerID+r.Size {
+				mappingFound = true
+				break
+			}
+		}
+		if !mappingFound {
+			gid5Available = false
+		}
+	}
+	if !gid5Available {
+		// If we have no GID mappings, the gid=5 default option would fail, so drop it.
+		g.RemoveMount("/dev/pts")
+		devPts := spec.Mount{
+			Destination: "/dev/pts",
+			Type:        "devpts",
+			Source:      "devpts",
+			Options:     []string{"rprivate", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
+		}
+		g.AddMount(devPts)
+	}
+
+	inUserNS := isRootless || isNewUserns
+
+	if inUserNS && s.IpcNS.IsHost() {
+		g.RemoveMount("/dev/mqueue")
+		devMqueue := spec.Mount{
+			Destination: "/dev/mqueue",
+			Type:        "bind", // constant ?
+			Source:      "/dev/mqueue",
+			Options:     []string{"bind", "nosuid", "noexec", "nodev"},
+		}
+		g.AddMount(devMqueue)
+	}
+	if inUserNS && s.PidNS.IsHost() {
+		g.RemoveMount("/proc")
+		procMount := spec.Mount{
+			Destination: "/proc",
+			Type:        define.TypeBind,
+			Source:      "/proc",
+			Options:     []string{"rbind", "nosuid", "noexec", "nodev"},
+		}
+		g.AddMount(procMount)
+	}
+
+	if addCgroup {
+		cgroupMnt := spec.Mount{
+			Destination: "/sys/fs/cgroup",
+			Type:        "cgroup",
+			Source:      "cgroup",
+			Options:     []string{"rprivate", "nosuid", "noexec", "nodev", "relatime", cgroupPerm},
+		}
+		g.AddMount(cgroupMnt)
+	}
+
+	g.Config.Linux.Personality = s.Personality
+
+	g.SetProcessCwd(s.WorkDir)
+
+	g.SetProcessArgs(finalCmd)
+
+	g.SetProcessTerminal(s.Terminal)
+
+	for key, val := range s.Annotations {
+		g.AddAnnotation(key, val)
+	}
+
+	if s.ResourceLimits != nil {
+		out, err := json.Marshal(s.ResourceLimits)
+		if err != nil {
+			return nil, err
+		}
+		err = json.Unmarshal(out, g.Config.Linux.Resources)
+		if err != nil {
+			return nil, err
+		}
+		g.Config.Linux.Resources = s.ResourceLimits
+	}
+
+	weightDevices, err := WeightDevices(s.WeightDevice)
+	if err != nil {
+		return nil, err
+	}
+	if len(weightDevices) > 0 {
+		for _, dev := range weightDevices {
+			g.AddLinuxResourcesBlockIOWeightDevice(dev.Major, dev.Minor, *dev.Weight)
+		}
+	}
+
+	// Devices
+	// set the default rule at the beginning of device configuration
+	if !inUserNS && !s.Privileged {
+		g.AddLinuxResourcesDevice(false, "", nil, nil, "rwm")
+	}
+
+	var userDevices []spec.LinuxDevice
+
+	if !s.Privileged {
+		// add default devices from containers.conf
+		for _, device := range rtc.Containers.Devices {
+			if err = DevicesFromPath(&g, device); err != nil {
+				return nil, err
+			}
+		}
+		if len(compatibleOptions.HostDeviceList) > 0 && len(s.Devices) == 0 {
+			userDevices = compatibleOptions.HostDeviceList
+		} else {
+			userDevices = s.Devices
+		}
+		// add default devices specified by caller
+		for _, device := range userDevices {
+			if err = DevicesFromPath(&g, device.Path); err != nil {
+				return nil, err
+			}
+		}
+	}
+	s.HostDeviceList = userDevices
+
+	// set the devices cgroup when not running in a user namespace
+	if !inUserNS && !s.Privileged {
+		for _, dev := range s.DeviceCgroupRule {
+			g.AddLinuxResourcesDevice(true, dev.Type, dev.Major, dev.Minor, dev.Access)
+		}
+	}
+
+	BlockAccessToKernelFilesystems(s.Privileged, s.PidNS.IsHost(), s.Mask, s.Unmask, &g)
+
+	g.ClearProcessEnv()
+	for name, val := range s.Env {
+		g.AddProcessEnv(name, val)
+	}
+
+	addRlimits(s, &g)
+
+	// NAMESPACES
+	if err := specConfigureNamespaces(s, &g, rt, pod); err != nil {
+		return nil, err
+	}
+	configSpec := g.Config
+
+	if err := securityConfigureGenerator(s, &g, newImage, rtc); err != nil {
+		return nil, err
+	}
+
+	// BIND MOUNTS
+	configSpec.Mounts = SupersedeUserMounts(mounts, configSpec.Mounts)
+	// Process mounts to ensure correct options
+	if err := InitFSMounts(configSpec.Mounts); err != nil {
+		return nil, err
+	}
+
+	// Add annotations
+	if configSpec.Annotations == nil {
+		configSpec.Annotations = make(map[string]string)
+	}
+
+	if s.Remove {
+		configSpec.Annotations[define.InspectAnnotationAutoremove] = define.InspectResponseTrue
+	} else {
+		configSpec.Annotations[define.InspectAnnotationAutoremove] = define.InspectResponseFalse
+	}
+
+	if len(s.VolumesFrom) > 0 {
+		configSpec.Annotations[define.InspectAnnotationVolumesFrom] = strings.Join(s.VolumesFrom, ",")
+	}
+
+	if s.Privileged {
+		configSpec.Annotations[define.InspectAnnotationPrivileged] = define.InspectResponseTrue
+	} else {
+		configSpec.Annotations[define.InspectAnnotationPrivileged] = define.InspectResponseFalse
+	}
+
+	if s.Init {
+		configSpec.Annotations[define.InspectAnnotationInit] = define.InspectResponseTrue
+	} else {
+		configSpec.Annotations[define.InspectAnnotationInit] = define.InspectResponseFalse
+	}
+
+	if s.OOMScoreAdj != nil {
+		g.SetProcessOOMScoreAdj(*s.OOMScoreAdj)
+	}
+	setProcOpts(s, &g)
+
+	return configSpec, nil
+}
+
+func WeightDevices(wtDevices map[string]spec.LinuxWeightDevice) ([]spec.LinuxWeightDevice, error) {
+	devs := []spec.LinuxWeightDevice{}
+	for k, v := range wtDevices {
+		statT := unix.Stat_t{}
+		if err := unix.Stat(k, &statT); err != nil {
+			return nil, fmt.Errorf("failed to inspect '%s' in --blkio-weight-device: %w", k, err)
+		}
+		dev := new(spec.LinuxWeightDevice)
+		dev.Major = (int64(unix.Major(uint64(statT.Rdev)))) //nolint: unconvert
+		dev.Minor = (int64(unix.Minor(uint64(statT.Rdev)))) //nolint: unconvert
+		dev.Weight = v.Weight
+		devs = append(devs, *dev)
+	}
+	return devs, nil
+}
diff --git a/pkg/specgen/generate/oci_unsupported.go b/pkg/specgen/generate/oci_unsupported.go
new file mode 100644
index 000000000..3902f9c9f
--- /dev/null
+++ b/pkg/specgen/generate/oci_unsupported.go
@@ -0,0 +1,24 @@
+//go:build !linux
+// +build !linux
+
+package generate
+
+import (
+	"context"
+	"errors"
+
+	"github.com/containers/common/libimage"
+	"github.com/containers/common/pkg/config"
+	"github.com/containers/podman/v4/libpod"
+	"github.com/containers/podman/v4/pkg/specgen"
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// SpecGenToOCI returns the base configuration for the container.
+func SpecGenToOCI(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.Runtime, rtc *config.Config, newImage *libimage.Image, mounts []spec.Mount, pod *libpod.Pod, finalCmd []string, compatibleOptions *libpod.InfraInherit) (*spec.Spec, error) {
+	return nil, errors.New("unsupported SpecGenToOCI")
+}
+
+func WeightDevices(wtDevices map[string]spec.LinuxWeightDevice) ([]spec.LinuxWeightDevice, error) {
+	return []spec.LinuxWeightDevice{}, errors.New("unsupported WeightDevices")
+}