From 736f857c1170a2f25e8af6b26694418b27a46043 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tam=C3=A1s=20Ecs=C3=A9di?= <ecsy.argh@gmail.com>
Date: Mon, 14 Oct 2019 17:28:25 +0200
Subject: [PATCH 1/2] Fix Red Hat os detection

---
 cmd/pke/app/util/linux/autodetect.go       |  9 +++++++--
 cmd/pke/app/util/linux/os_version_linux.go | 16 +++++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/cmd/pke/app/util/linux/autodetect.go b/cmd/pke/app/util/linux/autodetect.go
index 1cc15277..d620008a 100644
--- a/cmd/pke/app/util/linux/autodetect.go
+++ b/cmd/pke/app/util/linux/autodetect.go
@@ -17,6 +17,7 @@ package linux
 import (
 	"io"
 
+	"github.com/Masterminds/semver"
 	"github.com/banzaicloud/pke/cmd/pke/app/constants"
 )
 
@@ -48,8 +49,12 @@ func ContainerdPackagesImpl(out io.Writer) (ContainerdPackages, error) {
 	if err != nil {
 		ver, err = RedHatVersion(out)
 	}
-	if err == nil && (ver == "7" || ver == "8.0") {
-		return NewYumInstaller(), nil
+	if err == nil {
+		v, _ := semver.NewVersion(ver)
+		c, _ := semver.NewConstraint("7.x-0 || 8.x-0")
+		if c.Check(v) {
+			return NewYumInstaller(), nil
+		}
 	}
 
 	if distro, err := LSBReleaseDistributorID(out); err == nil {
diff --git a/cmd/pke/app/util/linux/os_version_linux.go b/cmd/pke/app/util/linux/os_version_linux.go
index 9f3a9177..b96c74e1 100644
--- a/cmd/pke/app/util/linux/os_version_linux.go
+++ b/cmd/pke/app/util/linux/os_version_linux.go
@@ -16,7 +16,10 @@ package linux
 
 import (
 	"bytes"
+	"fmt"
 	"io"
+	"io/ioutil"
+	"regexp"
 	"strings"
 
 	"emperror.dev/errors"
@@ -51,7 +54,18 @@ func CentOSVersion(w io.Writer) (string, error) {
 func RedHatVersion(w io.Writer) (string, error) {
 	o, err := runner.Cmd(w, "rpm", "--query", "redhat-release").Output()
 	if err != nil {
-		return "", err
+		// /etc/redhat-release
+		b, err := ioutil.ReadFile("/etc/redhat-release")
+		_, _ = fmt.Fprintf(w, "/etc/redhat-release: %q, err: %v\n", b, err)
+		if err != nil {
+			return "", err
+		}
+		re := regexp.MustCompile(`\d+(\.\d+)?`)
+		ver := re.Find(b)
+		if len(ver) == 0 {
+			return "", errors.New("failed to parse version")
+		}
+		return string(ver), nil
 	}
 
 	s := bytes.SplitN(o, dash, 4)

From 59cd61db41bf81198d32f5086b4618427ad64213 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tam=C3=A1s=20Ecs=C3=A9di?= <ecsy.argh@gmail.com>
Date: Tue, 15 Oct 2019 15:27:55 +0200
Subject: [PATCH 2/2] Fix Red Hat os detection

---
 cmd/pke/app/util/linux/autodetect.go | 11 ++++++++---
 cmd/pke/app/util/linux/kernel.go     |  2 ++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/cmd/pke/app/util/linux/autodetect.go b/cmd/pke/app/util/linux/autodetect.go
index d620008a..dc281a0f 100644
--- a/cmd/pke/app/util/linux/autodetect.go
+++ b/cmd/pke/app/util/linux/autodetect.go
@@ -22,11 +22,16 @@ import (
 )
 
 func KubernetesPackagesImpl(out io.Writer) (KubernetesPackages, error) {
-	if ver, err := CentOSVersion(out); err == nil {
-		if ver == "7" {
+	ver, err := CentOSVersion(out)
+	if err != nil {
+		ver, err = RedHatVersion(out)
+	}
+	if err == nil {
+		v, _ := semver.NewVersion(ver)
+		c, _ := semver.NewConstraint("7.x-0 || 8.x-0")
+		if c.Check(v) {
 			return NewYumInstaller(), nil
 		}
-		return nil, constants.ErrUnsupportedOS
 	}
 
 	if distro, err := LSBReleaseDistributorID(out); err == nil {
diff --git a/cmd/pke/app/util/linux/kernel.go b/cmd/pke/app/util/linux/kernel.go
index 56ecf3aa..39805da5 100644
--- a/cmd/pke/app/util/linux/kernel.go
+++ b/cmd/pke/app/util/linux/kernel.go
@@ -33,6 +33,8 @@ func KernelVersionConstraint(out io.Writer, constraint string) error {
 	if err != nil {
 		return err
 	}
+	// Red Hat Linux uses underscore: 3.10.0-327.el7.x86_64
+	version = bytes.ReplaceAll(version, []byte("_"), []byte(""))
 	v := string(bytes.TrimSpace(version))
 	ver, err := semver.NewVersion(v)
 	if err != nil {