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73ab887f25
* Add kubernetesDeploy step Co-authored-by: Sven Merk <33895725+nevskrem@users.noreply.github.com>
162 lines
3.0 KiB
Go
162 lines
3.0 KiB
Go
package command
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"os/exec"
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"sync"
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"github.com/pkg/errors"
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)
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// Command defines the information required for executing a call to any executable
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type Command struct {
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dir string
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stdout io.Writer
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stderr io.Writer
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env []string
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}
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// Dir sets the working directory for the execution
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func (c *Command) Dir(d string) {
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c.dir = d
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}
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// Env sets explicit environment variables to be used for execution
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func (c *Command) Env(e []string) {
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c.env = e
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}
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// Stdout ..
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func (c *Command) Stdout(stdout io.Writer) {
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c.stdout = stdout
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}
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// Stderr ..
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func (c *Command) Stderr(stderr io.Writer) {
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c.stderr = stderr
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}
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// ExecCommand defines how to execute os commands
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var ExecCommand = exec.Command
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// RunShell runs the specified command on the shell
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func (c *Command) RunShell(shell, script string) error {
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_out, _err := prepareOut(c.stdout, c.stderr)
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cmd := ExecCommand(shell)
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if len(c.dir) > 0 {
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cmd.Dir = c.dir
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}
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if len(c.env) > 0 {
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cmd.Env = c.env
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}
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in := bytes.Buffer{}
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in.Write([]byte(script))
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cmd.Stdin = &in
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if err := runCmd(cmd, _out, _err); err != nil {
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return errors.Wrapf(err, "running shell script failed with %v", shell)
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}
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return nil
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}
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// RunExecutable runs the specified executable with parameters
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func (c *Command) RunExecutable(executable string, params ...string) error {
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_out, _err := prepareOut(c.stdout, c.stderr)
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cmd := ExecCommand(executable, params...)
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if len(c.dir) > 0 {
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cmd.Dir = c.dir
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}
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if len(c.env) > 0 {
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cmd.Env = c.env
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}
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if err := runCmd(cmd, _out, _err); err != nil {
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return errors.Wrapf(err, "running command '%v' failed", executable)
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}
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return nil
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}
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func runCmd(cmd *exec.Cmd, _out, _err io.Writer) error {
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stdout, stderr, err := cmdPipes(cmd)
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if err != nil {
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return errors.Wrap(err, "getting commmand pipes failed")
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}
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err = cmd.Start()
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if err != nil {
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return errors.Wrap(err, "starting command failed")
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}
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var wg sync.WaitGroup
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wg.Add(2)
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var errStdout, errStderr error
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go func() {
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_, errStdout = io.Copy(_out, stdout)
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wg.Done()
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}()
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go func() {
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_, errStderr = io.Copy(_err, stderr)
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wg.Done()
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}()
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wg.Wait()
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err = cmd.Wait()
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if err != nil {
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return errors.Wrap(err, "cmd.Run() failed")
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}
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if errStdout != nil || errStderr != nil {
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return fmt.Errorf("failed to capture stdout/stderr: '%v'/'%v'", errStdout, errStderr)
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}
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return nil
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}
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func prepareOut(stdout, stderr io.Writer) (io.Writer, io.Writer) {
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//ToDo: check use of multiwriter instead to always write into os.Stdout and os.Stdin?
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//stdout := io.MultiWriter(os.Stdout, &stdoutBuf)
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//stderr := io.MultiWriter(os.Stderr, &stderrBuf)
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if stdout == nil {
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stdout = os.Stdout
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}
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if stderr == nil {
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stderr = os.Stderr
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}
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return stdout, stderr
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}
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func cmdPipes(cmd *exec.Cmd) (io.ReadCloser, io.ReadCloser, error) {
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, nil, errors.Wrap(err, "getting Stdout pipe failed")
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}
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stderr, err := cmd.StderrPipe()
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if err != nil {
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return nil, nil, errors.Wrap(err, "getting Stderr pipe failed")
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}
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return stdout, stderr, nil
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}
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