libpod: Split out platform-specific code from hostInfo

[NO NEW TESTS NEEDED]

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

libpod/info.go

@@ -11,7 +11,6 @@ import (
 	"io/ioutil"
 	"math"
 	"os"
-	"os/exec"
 	"runtime"
 	"strconv"
 	"strings"
@@ -19,16 +18,12 @@ import (
 	"time"
 
 	"github.com/containers/buildah"
-	"github.com/containers/common/pkg/apparmor"
-	"github.com/containers/common/pkg/cgroups"
-	"github.com/containers/common/pkg/seccomp"
 	"github.com/containers/image/v5/pkg/sysregistriesv2"
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/libpod/linkmode"
 	"github.com/containers/podman/v4/pkg/rootless"
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/system"
-	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/sirupsen/logrus"
 )
 
@@ -104,22 +99,6 @@ func (r *Runtime) hostInfo() (*define.HostInfo, error) {
 		return nil, fmt.Errorf("error getting hostname: %w", err)
 	}
 
-	seccompProfilePath, err := DefaultSeccompPath()
-	if err != nil {
-		return nil, fmt.Errorf("error getting Seccomp profile path: %w", err)
-	}
-
-	// Cgroups version
-	unified, err := cgroups.IsCgroup2UnifiedMode()
-	if err != nil {
-		return nil, fmt.Errorf("error reading cgroups mode: %w", err)
-	}
-
-	// Get Map of all available controllers
-	availableControllers, err := cgroups.GetAvailableControllers(nil, unified)
-	if err != nil {
-		return nil, fmt.Errorf("error getting available cgroup controllers: %w", err)
-	}
 	cpuUtil, err := getCPUUtilization()
 	if err != nil {
 		return nil, err
@@ -127,8 +106,6 @@ func (r *Runtime) hostInfo() (*define.HostInfo, error) {
 	info := define.HostInfo{
 		Arch:           runtime.GOARCH,
 		BuildahVersion: buildah.Version,
-		CgroupManager:     r.config.Engine.CgroupManager,
-		CgroupControllers: availableControllers,
 		Linkmode:       linkmode.Linkmode(),
 		CPUs:           runtime.NumCPU(),
 		CPUUtilization: cpuUtil,
@@ -136,62 +113,16 @@ func (r *Runtime) hostInfo() (*define.HostInfo, error) {
 		LogDriver:      r.config.Containers.LogDriver,
 		EventLogger:    r.eventer.String(),
 		Hostname:       host,
-		IDMappings:        define.IDMappings{},
 		Kernel:         kv,
 		MemFree:        mi.MemFree,
 		MemTotal:       mi.MemTotal,
 		NetworkBackend: r.config.Network.NetworkBackend,
 		OS:             runtime.GOOS,
-		Security: define.SecurityInfo{
-			AppArmorEnabled:     apparmor.IsEnabled(),
-			DefaultCapabilities: strings.Join(r.config.Containers.DefaultCapabilities, ","),
-			Rootless:            rootless.IsRootless(),
-			SECCOMPEnabled:      seccomp.IsEnabled(),
-			SECCOMPProfilePath:  seccompProfilePath,
-			SELinuxEnabled:      selinux.GetEnabled(),
-		},
-		Slirp4NetNS: define.SlirpInfo{},
 		SwapFree:       mi.SwapFree,
 		SwapTotal:      mi.SwapTotal,
 	}
-
+	if err := r.setPlatformHostInfo(&info); err != nil {
-	cgroupVersion := "v1"
+		return nil, err
-	if unified {
-		cgroupVersion = "v2"
-	}
-	info.CgroupsVersion = cgroupVersion
-
-	slirp4netnsPath := r.config.Engine.NetworkCmdPath
-	if slirp4netnsPath == "" {
-		slirp4netnsPath, _ = exec.LookPath("slirp4netns")
-	}
-	if slirp4netnsPath != "" {
-		version, err := programVersion(slirp4netnsPath)
-		if err != nil {
-			logrus.Warnf("Failed to retrieve program version for %s: %v", slirp4netnsPath, err)
-		}
-		program := define.SlirpInfo{
-			Executable: slirp4netnsPath,
-			Package:    packageVersion(slirp4netnsPath),
-			Version:    version,
-		}
-		info.Slirp4NetNS = program
-	}
-
-	if rootless.IsRootless() {
-		uidmappings, err := rootless.ReadMappingsProc("/proc/self/uid_map")
-		if err != nil {
-			return nil, fmt.Errorf("error reading uid mappings: %w", err)
-		}
-		gidmappings, err := rootless.ReadMappingsProc("/proc/self/gid_map")
-		if err != nil {
-			return nil, fmt.Errorf("error reading gid mappings: %w", err)
-		}
-		idmappings := define.IDMappings{
-			GIDMap: gidmappings,
-			UIDMap: uidmappings,
-		}
-		info.IDMappings = idmappings
 	}
 
 	conmonInfo, ociruntimeInfo, err := r.defaultOCIRuntime.RuntimeInfo()

libpod/info_linux.go

@@ -0,0 +1,88 @@
+package libpod
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"github.com/containers/common/pkg/apparmor"
+	"github.com/containers/common/pkg/cgroups"
+	"github.com/containers/common/pkg/seccomp"
+	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/rootless"
+	"github.com/opencontainers/selinux/go-selinux"
+	"github.com/sirupsen/logrus"
+)
+
+func (r *Runtime) setPlatformHostInfo(info *define.HostInfo) error {
+	seccompProfilePath, err := DefaultSeccompPath()
+	if err != nil {
+		return fmt.Errorf("error getting Seccomp profile path: %w", err)
+	}
+
+	// Cgroups version
+	unified, err := cgroups.IsCgroup2UnifiedMode()
+	if err != nil {
+		return fmt.Errorf("error reading cgroups mode: %w", err)
+	}
+
+	// Get Map of all available controllers
+	availableControllers, err := cgroups.GetAvailableControllers(nil, unified)
+	if err != nil {
+		return fmt.Errorf("error getting available cgroup controllers: %w", err)
+	}
+
+	info.CgroupManager = r.config.Engine.CgroupManager
+	info.CgroupControllers = availableControllers
+	info.IDMappings = define.IDMappings{}
+	info.Security = define.SecurityInfo{
+		AppArmorEnabled:     apparmor.IsEnabled(),
+		DefaultCapabilities: strings.Join(r.config.Containers.DefaultCapabilities, ","),
+		Rootless:            rootless.IsRootless(),
+		SECCOMPEnabled:      seccomp.IsEnabled(),
+		SECCOMPProfilePath:  seccompProfilePath,
+		SELinuxEnabled:      selinux.GetEnabled(),
+	}
+	info.Slirp4NetNS = define.SlirpInfo{}
+
+	cgroupVersion := "v1"
+	if unified {
+		cgroupVersion = "v2"
+	}
+	info.CgroupsVersion = cgroupVersion
+
+	slirp4netnsPath := r.config.Engine.NetworkCmdPath
+	if slirp4netnsPath == "" {
+		slirp4netnsPath, _ = exec.LookPath("slirp4netns")
+	}
+	if slirp4netnsPath != "" {
+		version, err := programVersion(slirp4netnsPath)
+		if err != nil {
+			logrus.Warnf("Failed to retrieve program version for %s: %v", slirp4netnsPath, err)
+		}
+		program := define.SlirpInfo{
+			Executable: slirp4netnsPath,
+			Package:    packageVersion(slirp4netnsPath),
+			Version:    version,
+		}
+		info.Slirp4NetNS = program
+	}
+
+	if rootless.IsRootless() {
+		uidmappings, err := rootless.ReadMappingsProc("/proc/self/uid_map")
+		if err != nil {
+			return fmt.Errorf("error reading uid mappings: %w", err)
+		}
+		gidmappings, err := rootless.ReadMappingsProc("/proc/self/gid_map")
+		if err != nil {
+			return fmt.Errorf("error reading gid mappings: %w", err)
+		}
+		idmappings := define.IDMappings{
+			GIDMap: gidmappings,
+			UIDMap: uidmappings,
+		}
+		info.IDMappings = idmappings
+	}
+
+	return nil
+}