98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
/*
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© Copyright IBM Corporation 2020
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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 mqversion
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/ibm-messaging/mq-container/internal/command"
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)
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// Get will return the current MQ version
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func Get() (string, error) {
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mqVersion, _, err := command.Run("dspmqver", "-b", "-f", "2")
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if err != nil {
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return "", fmt.Errorf("Error Getting MQ version: %v", err)
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}
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return strings.TrimSpace(mqVersion), nil
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}
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// Compare returns an integer comparing two MQ version strings lexicographically. The result will be 0 if currentVersion==checkVersion, -1 if currentVersion < checkVersion, and +1 if currentVersion > checkVersion
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func Compare(checkVersion string) (int, error) {
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currentVersion, err := Get()
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if err != nil {
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return 0, err
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}
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currentVRMF, err := parseVRMF(currentVersion)
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if err != nil {
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return 0, err
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}
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compareVRMF, err := parseVRMF(checkVersion)
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if err != nil {
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return 0, fmt.Errorf("failed to parse compare version: %w", err)
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}
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return currentVRMF.compare(*compareVRMF), nil
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}
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type vrmf [4]int
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func (v vrmf) String() string {
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return fmt.Sprintf("%d.%d.%d.%d", v[0], v[1], v[2], v[3])
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}
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func (v vrmf) compare(to vrmf) int {
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for idx := 0; idx < 4; idx++ {
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if v[idx] < to[idx] {
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return -1
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}
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if v[idx] > to[idx] {
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return 1
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}
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}
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return 0
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}
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func parseVRMF(vrmfString string) (*vrmf, error) {
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versionParts := strings.Split(vrmfString, ".")
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if len(versionParts) != 4 {
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return nil, fmt.Errorf("incorrect number of parts to version string: expected 4, got %d", len(versionParts))
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}
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vmrfPartNames := []string{"version", "release", "minor", "fix"}
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parsed := vrmf{}
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for idx, value := range versionParts {
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partName := vmrfPartNames[idx]
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if value == "" {
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return nil, fmt.Errorf("empty %s found in VRMF", partName)
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}
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val, err := strconv.Atoi(value)
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if err != nil {
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return nil, fmt.Errorf("non-numeric %s found in VRMF", partName)
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}
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if val < 0 {
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return nil, fmt.Errorf("negative %s found in VRMF", partName)
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}
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if idx == 0 && val == 0 {
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return nil, fmt.Errorf("zero value for version not allowed")
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}
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parsed[idx] = val
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}
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return &parsed, nil
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}
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