65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
/*
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© Copyright IBM Corporation 2018
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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 main
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import (
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"fmt"
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"os"
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"path/filepath"
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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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// Verifies that we are the main or only instance of this program
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func verifySingleProcess() error {
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programName, err := determineExecutable()
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if err != nil {
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return fmt.Errorf("Failed to determine name of this program - %v", err)
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}
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// Verify that there is only one runmqserver
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_, err = verifyOnlyOne(programName)
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if err != nil {
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return fmt.Errorf("You cannot run more than one instance of this program")
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}
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return nil
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}
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// Verifies that there is only one instance running of the given program name.
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func verifyOnlyOne(programName string) (int, error) {
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// #nosec G104
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out, _, _ := command.Run("ps", "-e", "--format", "cmd")
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//if this goes wrong then assume we are the only one
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numOfProg := strings.Count(out, programName)
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if numOfProg != 1 {
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return numOfProg, fmt.Errorf("Expected there to be only 1 instance of %s but found %d", programName, numOfProg)
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}
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return numOfProg, nil
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}
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// Determines the name of the currently running executable.
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func determineExecutable() (string, error) {
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file, err := os.Executable()
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if err != nil {
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return "", err
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}
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_, exec := filepath.Split(file)
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return exec, nil
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}
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