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70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
// Copyright (c) 2017 Gorillalabs. All rights reserved.
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package backend
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import (
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"fmt"
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"io"
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"regexp"
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"strings"
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"github.com/pkg/errors"
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)
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// sshSession exists so we don't create a hard dependency on crypto/ssh.
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type sshSession interface {
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Waiter
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StdinPipe() (io.WriteCloser, error)
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StdoutPipe() (io.Reader, error)
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StderrPipe() (io.Reader, error)
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Start(string) error
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}
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type SSH struct {
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Session sshSession
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}
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func (b *SSH) StartProcess(cmd string, args ...string) (Waiter, io.Writer, io.Reader, io.Reader, error) {
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stdin, err := b.Session.StdinPipe()
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if err != nil {
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return nil, nil, nil, nil, errors.Wrap(err, "Could not get hold of the SSH session's stdin stream")
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}
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stdout, err := b.Session.StdoutPipe()
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if err != nil {
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return nil, nil, nil, nil, errors.Wrap(err, "Could not get hold of the SSH session's stdout stream")
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}
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stderr, err := b.Session.StderrPipe()
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if err != nil {
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return nil, nil, nil, nil, errors.Wrap(err, "Could not get hold of the SSH session's stderr stream")
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}
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err = b.Session.Start(b.createCmd(cmd, args))
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if err != nil {
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return nil, nil, nil, nil, errors.Wrap(err, "Could not spawn process via SSH")
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}
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return b.Session, stdin, stdout, stderr, nil
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}
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func (b *SSH) createCmd(cmd string, args []string) string {
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parts := []string{cmd}
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simple := regexp.MustCompile(`^[a-z0-9_/.~+-]+$`)
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for _, arg := range args {
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if !simple.MatchString(arg) {
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arg = b.quote(arg)
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}
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parts = append(parts, arg)
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}
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return strings.Join(parts, " ")
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}
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func (b *SSH) quote(s string) string {
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return fmt.Sprintf(`"%s"`, s)
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}
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