mirror of https://github.com/k3s-io/k3s
118 lines
2.4 KiB
Go
118 lines
2.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package rkt
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import (
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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)
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type rktVersion []int
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func parseVersion(input string) (rktVersion, error) {
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tail := strings.Index(input, "+")
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if tail > 0 {
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input = input[:tail]
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}
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var result rktVersion
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tuples := strings.Split(input, ".")
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for _, t := range tuples {
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n, err := strconv.Atoi(t)
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if err != nil {
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return nil, err
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}
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result = append(result, n)
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}
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return result, nil
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}
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func (r rktVersion) Compare(other string) (int, error) {
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v, err := parseVersion(other)
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if err != nil {
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return -1, err
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}
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for i := range r {
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if i > len(v)-1 {
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return 1, nil
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}
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if r[i] < v[i] {
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return -1, nil
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}
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if r[i] > v[i] {
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return 1, nil
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}
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}
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// When loop ends, len(r) is <= len(v).
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if len(r) < len(v) {
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return -1, nil
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}
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return 0, nil
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}
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func (r rktVersion) String() string {
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var version []string
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for _, v := range r {
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version = append(version, fmt.Sprintf("%d", v))
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}
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return strings.Join(version, ".")
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}
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type systemdVersion int
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func (s systemdVersion) String() string {
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return fmt.Sprintf("%d", s)
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}
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func (s systemdVersion) Compare(other string) (int, error) {
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v, err := strconv.Atoi(other)
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if err != nil {
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return -1, err
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}
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if int(s) < v {
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return -1, nil
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} else if int(s) > v {
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return 1, nil
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}
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return 0, nil
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}
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func getSystemdVersion() (systemdVersion, error) {
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output, err := exec.Command("systemctl", "--version").Output()
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if err != nil {
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return -1, err
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}
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// Example output of 'systemctl --version':
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//
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// systemd 215
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// +PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR
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//
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lines := strings.Split(string(output), "\n")
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tuples := strings.Split(lines[0], " ")
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if len(tuples) != 2 {
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return -1, fmt.Errorf("rkt: Failed to parse version %v", lines)
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}
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result, err := strconv.Atoi(string(tuples[1]))
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if err != nil {
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return -1, err
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}
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return systemdVersion(result), nil
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}
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