1 files changed, 132 insertions, 0 deletions
diff --git a/libpod/info_linux.go b/libpod/info_linux.go
new file mode 100644
index 000000000..801dcdb43
--- /dev/null
+++ b/libpod/info_linux.go
@@ -0,0 +1,132 @@
+package libpod
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"os"
+	"os/exec"
+	"strconv"
+	"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
+}
+
+func statToPercent(stats []string) (*define.CPUUsage, error) {
+	userTotal, err := strconv.ParseFloat(stats[1], 64)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse user value %q: %w", stats[1], err)
+	}
+	systemTotal, err := strconv.ParseFloat(stats[3], 64)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse system value %q: %w", stats[3], err)
+	}
+	idleTotal, err := strconv.ParseFloat(stats[4], 64)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse idle value %q: %w", stats[4], err)
+	}
+	total := userTotal + systemTotal + idleTotal
+	s := define.CPUUsage{
+		UserPercent:   math.Round((userTotal/total*100)*100) / 100,
+		SystemPercent: math.Round((systemTotal/total*100)*100) / 100,
+		IdlePercent:   math.Round((idleTotal/total*100)*100) / 100,
+	}
+	return &s, nil
+}
+
+// getCPUUtilization Returns a CPUUsage object that summarizes CPU
+// usage for userspace, system, and idle time.
+func getCPUUtilization() (*define.CPUUsage, error) {
+	f, err := os.Open("/proc/stat")
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+	// Read first line of /proc/stat that has entries for system ("cpu" line)
+	for scanner.Scan() {
+		break
+	}
+	// column 1 is user, column 3 is system, column 4 is idle
+	stats := strings.Fields(scanner.Text())
+	return statToPercent(stats)
+}