runtime: refactor commandline code directory

Move all command line code to `cmd` and move containerd-shim-v2 to pkg.

Fixes: #2627
Signed-off-by: Peng Tao <bergwolf@hyper.sh>

src/runtime/cmd/kata-runtime/utils.go

@@ -0,0 +1,191 @@
+// Copyright (c) 2014 Docker, Inc.
+// Copyright (c) 2017 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/blang/semver"
+	"github.com/kata-containers/kata-containers/src/runtime/pkg/katautils"
+)
+
+const (
+	unknown = "<<unknown>>"
+)
+
+// variables to allow tests to modify the values
+var (
+	procVersion = "/proc/version"
+	osRelease   = "/etc/os-release"
+
+	// Clear Linux has a different path (for stateless support)
+	osReleaseClr = "/usr/lib/os-release"
+
+	unknownVersionInfo = VersionInfo{
+		Semver: unknown,
+		Commit: unknown,
+	}
+)
+
+func getKernelVersion() (string, error) {
+	contents, err := katautils.GetFileContents(procVersion)
+	if err != nil {
+		return "", err
+	}
+
+	fields := strings.Fields(contents)
+
+	if len(fields) < 3 {
+		return "", fmt.Errorf("unexpected contents in %v", procVersion)
+	}
+
+	version := fields[2]
+
+	return version, nil
+}
+
+// getDistroDetails returns the distributions name and version string.
+// If it is not possible to determine both values an error is
+// returned.
+func getDistroDetails() (name, version string, err error) {
+	files := []string{osRelease, osReleaseClr}
+	name = ""
+	version = ""
+
+	for _, file := range files {
+		contents, err := katautils.GetFileContents(file)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
+
+			return "", "", err
+		}
+
+		lines := strings.Split(contents, "\n")
+
+		for _, line := range lines {
+			if strings.HasPrefix(line, "NAME=") && name == "" {
+				fields := strings.Split(line, "=")
+				name = strings.Trim(fields[1], `"`)
+			} else if strings.HasPrefix(line, "VERSION_ID=") && version == "" {
+				fields := strings.Split(line, "=")
+				version = strings.Trim(fields[1], `"`)
+			}
+		}
+
+		if name != "" && version != "" {
+			return name, version, nil
+		}
+	}
+
+	if name == "" {
+		name = unknown
+	}
+
+	if version == "" {
+		version = unknown
+	}
+
+	return name, version, nil
+}
+
+// genericGetCPUDetails returns the vendor and model of the CPU.
+// If it is not possible to determine both values an error is
+// returned.
+func genericGetCPUDetails() (vendor, model string, err error) {
+	cpuinfo, err := getCPUInfo(procCPUInfo)
+	if err != nil {
+		return "", "", err
+	}
+
+	lines := strings.Split(cpuinfo, "\n")
+
+	for _, line := range lines {
+		if archCPUVendorField != "" {
+			if strings.HasPrefix(line, archCPUVendorField) {
+				fields := strings.Split(line, ":")
+				if len(fields) > 1 {
+					vendor = strings.TrimSpace(fields[1])
+				}
+			}
+		}
+
+		if archCPUModelField != "" {
+			if strings.HasPrefix(line, archCPUModelField) {
+				fields := strings.Split(line, ":")
+				if len(fields) > 1 {
+					model = strings.TrimSpace(fields[1])
+				}
+			}
+		}
+	}
+
+	if archCPUVendorField != "" && vendor == "" {
+		return "", "", fmt.Errorf("cannot find vendor field in file %v", procCPUInfo)
+	}
+
+	// model name is optional
+	if archCPUModelField != "" && model == "" {
+		return "", "", fmt.Errorf("cannot find model field in file %v", procCPUInfo)
+	}
+
+	return vendor, model, nil
+}
+
+// from runC
+// parseBoolOrAuto returns (nil, nil) if s is empty or "auto"
+func parseBoolOrAuto(s string) (*bool, error) {
+	if s == "" || strings.ToLower(s) == "auto" {
+		return nil, nil
+	}
+	b, err := strconv.ParseBool(s)
+	return &b, err
+}
+
+// constructVersionInfo constructs VersionInfo-type value from a version string
+// in the format of "Kata-Component version Major.Minor.Patch-rc_xxx-Commit".
+func constructVersionInfo(version string) VersionInfo {
+	fields := strings.Split(version, " ")
+	realVersion := fields[len(fields)-1]
+
+	sv, err := semver.Make(realVersion)
+	if err != nil {
+		return unknownVersionInfo
+	}
+
+	var pres string
+	if len(sv.Pre) > 0 {
+		presSplit := strings.Split(sv.Pre[0].VersionStr, "-")
+		if len(presSplit) > 2 {
+			pres = presSplit[1]
+		}
+	}
+
+	// version contains Commit info.
+	if len(pres) > 1 {
+		return VersionInfo{
+			Semver: realVersion,
+			Major:  sv.Major,
+			Minor:  sv.Minor,
+			Patch:  sv.Patch,
+			Commit: pres,
+		}
+	}
+
+	return VersionInfo{
+		Semver: realVersion,
+		Major:  sv.Major,
+		Minor:  sv.Minor,
+		Patch:  sv.Patch,
+		Commit: unknown,
+	}
+
+}