ref(pkg/version): allow comparison of pre-releases

pkg/version/compatible.go

@@ -18,6 +18,7 @@ package version // import "k8s.io/helm/pkg/version"
 
 import (
 	"fmt"
+	"regexp"
 	"strings"
 
 	"github.com/Masterminds/semver"
@@ -53,6 +54,18 @@ func IsCompatibleRange(constraint, ver string) bool {
 		return false
 	}
 
+	verSuffix := sv.Prerelease()
+	if verSuffix != "" {
+		if !IsConstraintPrerelease(constraint) {
+			constraint = constraint + "-r0"
+			trimmedVer := strings.TrimSuffix(sv.String(), "-"+verSuffix)
+			sv, err = semver.NewVersion(trimmedVer)
+			if err != nil {
+				return false
+			}
+		}
+	}
+
 	c, err := semver.NewConstraint(constraint)
 	if err != nil {
 		return false
@@ -60,6 +73,27 @@ func IsCompatibleRange(constraint, ver string) bool {
 	return c.Check(sv)
 }
 
+func IsConstraintPrerelease(constraint string) bool {
+	base := constraint
+	for _, c := range constraint {
+		char := string(c)
+		r := regexp.MustCompile(`^[0-9]+`).MatchString(char)
+		if !r {
+			base = strings.TrimPrefix(base, char)
+		} else {
+			break
+		}
+	}
+	baseVer, err := semver.NewVersion(base)
+	if err != nil {
+		return false
+	}
+	if baseVer.Prerelease() == "" {
+		return false
+	}
+	return true
+}
+
 func isUnreleased(v string) bool {
 	return strings.HasSuffix(v, "unreleased")
 }

pkg/version/compatible_test.go

@@ -56,6 +56,10 @@ func TestIsCompatibleRange(t *testing.T) {
 		{"v2", "v2.0.0", true},
 		{">2.0.0", "v2.1.1", true},
 		{"v2.1.*", "v2.1.1", true},
+		{">=1.8.0", "v1.9.4-gke.1", true},
+		{">=1.8.0", "v1.7.4-gke.1", false},
+		{"<=1.8.0", "v1.7.4-gke.1", true},
+		{"~v2.0.0", "v2.0.1-gke1", true},
 	}
 
 	for _, tt := range tests {