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exec.go
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/*
* Copyright 2018 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utils
import (
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"github.com/CovenantSQL/CovenantSQL/utils/log"
)
// FJ is short for filepath.Join.
var FJ = filepath.Join
// CMD is the struct holding exec.Cmd and log path.
type CMD struct {
Cmd *exec.Cmd
LogPath string
LogFD *os.File
}
// GetProjectSrcDir gets the src code root.
func GetProjectSrcDir() string {
_, testFile, _, _ := runtime.Caller(0)
return FJ(filepath.Dir(testFile), "../")
}
// RunCommand runs a command and capture its output to a log file,
// if toStd is true also output to stdout and stderr.
func RunCommand(bin string, args []string, processName string, workingDir string, logDir string, toStd bool) (err error) {
cmd, err := RunCommandNB(bin, args, processName, workingDir, logDir, toStd)
if err != nil {
log.WithFields(log.Fields{
"bin": bin,
"args": args,
"process": processName,
}).WithError(err).Error("start command failed")
return
}
defer func() {
_ = cmd.LogFD.Close()
}()
err = cmd.Cmd.Wait()
if err != nil {
log.WithFields(log.Fields{
"path": cmd.Cmd.Path,
"args": cmd.Cmd.Args,
}).WithError(err).Error("wait command failed")
return
}
return
}
// RunCommandNB starts a non-blocking command.
func RunCommandNB(bin string, args []string, processName string, workingDir string, logDir string, toStd bool) (cmd *CMD, err error) {
cmd = new(CMD)
err = os.Chdir(workingDir)
if err != nil {
log.WithField("wd", workingDir).Error("change working dir failed")
return
}
cmd.LogPath = FJ(logDir, processName+".log")
cmd.LogFD, err = os.Create(cmd.LogPath)
if err != nil {
log.WithField("path", cmd.LogPath).WithError(err).Error("create log file failed")
return
}
cmd.Cmd = exec.Command(bin, args...)
if toStd {
cmd.Cmd.Stdout = io.MultiWriter(os.Stdout, cmd.LogFD)
cmd.Cmd.Stderr = io.MultiWriter(os.Stderr, cmd.LogFD)
} else {
cmd.Cmd.Stdout = cmd.LogFD
cmd.Cmd.Stderr = cmd.LogFD
}
err = cmd.Cmd.Start()
if err != nil {
log.WithError(err).Error("cmd.Start() failed")
_ = cmd.LogFD.Close()
cmd = nil
return
}
return
}