Implements non-regex way to set kernel version

config/config.go

@@ -5,20 +5,32 @@
 package config
 
 import (
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/naoina/toml"
 )
 
+type kernel struct {
+	Version []int
+	Major   []int
+	Minor   []int
+	Patch   []int
+}
+
 // KernelMask defines the kernel
 type KernelMask struct {
 	DistroType    DistroType
 	DistroRelease string // 18.04/7.4.1708/9.1
 	ReleaseMask   string
+
+	// Overrides ReleaseMask
+	Kernel kernel
 }
 
 // DockerName is returns stable name for docker container
@@ -225,17 +237,93 @@ func ReadKernelConfig(path string) (kernelCfg KernelConfig, err error) {
 	return
 }
 
+func rangeRegexp(start, end int) (s string) {
+	s += "("
+	for i := start; i <= end; i++ {
+		s += strconv.Itoa(i)
+		if i != end {
+			s += "|"
+		}
+	}
+	s += ")"
+	return
+}
+
+func versionRegexp(l []int) (s string, err error) {
+	switch len(l) {
+	case 1:
+		s += strconv.Itoa(l[0])
+	case 2:
+		s += rangeRegexp(l[0], l[1])
+	default:
+		err = errors.New("version must contain one value or range")
+		return
+	}
+	return
+}
+
+func genReleaseMask(km kernel) (mask string, err error) {
+	s, err := versionRegexp(km.Version)
+	if err != nil {
+		return
+	}
+	mask += s + "."
+
+	s, err = versionRegexp(km.Major)
+	if err != nil {
+		return
+	}
+	mask += s + "."
+
+	s, err = versionRegexp(km.Minor)
+	if err != nil {
+		return
+	}
+	mask += s
+
+	switch len(km.Patch) {
+	case 0:
+		// ok
+	case 1:
+		mask += "-" + strconv.Itoa(km.Patch[0])
+	case 2:
+		mask += "-" + rangeRegexp(km.Patch[0], km.Patch[1])
+	default:
+		err = errors.New("version must contain one value or range")
+		return
+	}
+
+	mask += "-.*"
+	return
+}
+
 // ReadArtifactConfig is for read .out-of-tree.toml
-func ReadArtifactConfig(path string) (artifactCfg Artifact, err error) {
+func ReadArtifactConfig(path string) (ka Artifact, err error) {
 	buf, err := readFileAll(path)
 	if err != nil {
 		return
 	}
 
-	err = toml.Unmarshal(buf, &artifactCfg)
+	err = toml.Unmarshal(buf, &ka)
 	if err != nil {
 		return
 	}
 
+	for i, _ := range ka.SupportedKernels {
+		km := &ka.SupportedKernels[i]
+		if len(km.Kernel.Version) != 0 && km.ReleaseMask != "" {
+			s := "Only one way to define kernel version is allowed"
+			err = errors.New(s)
+			return
+		}
+
+		if km.ReleaseMask == "" {
+			km.ReleaseMask, err = genReleaseMask(km.Kernel)
+			if err != nil {
+				return
+			}
+		}
+	}
+
 	return
 }