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package docker
import (
"fmt"
"io"
"log"
"os/exec"
"regexp"
"strings"
"sync"
"syscall"
"github.com/hashicorp/packer/packer"
"github.com/mitchellh/iochan"
)
func runAndStream(cmd *exec.Cmd, ui packer.Ui) error {
stdout_r, stdout_w := io.Pipe()
stderr_r, stderr_w := io.Pipe()
defer stdout_w.Close()
defer stderr_w.Close()
args := make([]string, len(cmd.Args)-1)
copy(args, cmd.Args[1:])
// Scrub password from the log output.
for i, v := range args {
if v == "-p" || v == "--password" {
args[i+1] = "<Filtered>"
break
}
}
log.Printf("Executing: %s %v", cmd.Path, args)
cmd.Stdout = stdout_w
cmd.Stderr = stderr_w
if err := cmd.Start(); err != nil {
return err
}
// Create the channels we'll use for data
exitCh := make(chan int, 1)
stdoutCh := iochan.DelimReader(stdout_r, '\n')
stderrCh := iochan.DelimReader(stderr_r, '\n')
// Start the goroutine to watch for the exit
go func() {
defer stdout_w.Close()
defer stderr_w.Close()
exitStatus := 0
err := cmd.Wait()
if exitErr, ok := err.(*exec.ExitError); ok {
exitStatus = 1
// There is no process-independent way to get the REAL
// exit status so we just try to go deeper.
if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
exitStatus = status.ExitStatus()
}
}
exitCh <- exitStatus
}()
// This waitgroup waits for the streaming to end
var streamWg sync.WaitGroup
streamWg.Add(2)
streamFunc := func(ch <-chan string) {
defer streamWg.Done()
for data := range ch {
data = cleanOutputLine(data)
if data != "" {
ui.Message(data)
}
}
}
// Stream stderr/stdout
go streamFunc(stderrCh)
go streamFunc(stdoutCh)
// Wait for the process to end and then wait for the streaming to end
exitStatus := <-exitCh
streamWg.Wait()
if exitStatus != 0 {
return fmt.Errorf("Bad exit status: %d", exitStatus)
}
return nil
}
// cleanOutputLine cleans up a line so that '\r' don't muck up the
// UI output when we're reading from a remote command.
func cleanOutputLine(line string) string {
// Build a regular expression that will get rid of shell codes
re := regexp.MustCompile("(?i)\x1b\\[([0-9]{1,2}(;[0-9]{1,2})?)?[a|b|m|k]")
line = re.ReplaceAllString(line, "")
// Trim surrounding whitespace
line = strings.TrimSpace(line)
// Trim up to the first carriage return, since that text would be
// lost anyways.
idx := strings.LastIndex(line, "\r")
if idx > -1 {
line = line[idx+1:]
}
return line
}
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