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package utils
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"strconv"
"strings"
"github.com/containers/storage/pkg/archive"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ExecCmd executes a command with args and returns its output as a string along
// with an error, if any
func ExecCmd(name string, args ...string) (string, error) {
cmd := exec.Command(name, args...)
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return "", fmt.Errorf("`%v %v` failed: %v %v (%v)", name, strings.Join(args, " "), stderr.String(), stdout.String(), err)
}
return stdout.String(), nil
}
// ExecCmdWithStdStreams execute a command with the specified standard streams.
func ExecCmdWithStdStreams(stdin io.Reader, stdout, stderr io.Writer, env []string, name string, args ...string) error {
cmd := exec.Command(name, args...)
cmd.Stdin = stdin
cmd.Stdout = stdout
cmd.Stderr = stderr
if env != nil {
cmd.Env = env
}
err := cmd.Run()
if err != nil {
return fmt.Errorf("`%v %v` failed: %v", name, strings.Join(args, " "), err)
}
return nil
}
// ErrDetach is an error indicating that the user manually detached from the
// container.
var ErrDetach = errors.New("detached from container")
// CopyDetachable is similar to io.Copy but support a detach key sequence to break out.
func CopyDetachable(dst io.Writer, src io.Reader, keys []byte) (written int64, err error) {
buf := make([]byte, 32*1024)
for {
nr, er := src.Read(buf)
if nr > 0 {
preservBuf := []byte{}
for i, key := range keys {
preservBuf = append(preservBuf, buf[0:nr]...)
if nr != 1 || buf[0] != key {
break
}
if i == len(keys)-1 {
return 0, ErrDetach
}
nr, er = src.Read(buf)
}
var nw int
var ew error
if len(preservBuf) > 0 {
nw, ew = dst.Write(preservBuf)
nr = len(preservBuf)
} else {
nw, ew = dst.Write(buf[0:nr])
}
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er != nil {
if er != io.EOF {
err = er
}
break
}
}
return written, err
}
// UntarToFileSystem untars an os.file of a tarball to a destination in the filesystem
func UntarToFileSystem(dest string, tarball *os.File, options *archive.TarOptions) error {
logrus.Debugf("untarring %s", tarball.Name())
return archive.Untar(tarball, dest, options)
}
// TarToFilesystem creates a tarball from source and writes to an os.file
// provided
func TarToFilesystem(source string, tarball *os.File) error {
tb, err := Tar(source)
if err != nil {
return err
}
_, err = io.Copy(tarball, tb)
if err != nil {
return err
}
logrus.Debugf("wrote tarball file %s", tarball.Name())
return nil
}
// Tar creates a tarball from source and returns a readcloser of it
func Tar(source string) (io.ReadCloser, error) {
logrus.Debugf("creating tarball of %s", source)
return archive.Tar(source, archive.Uncompressed)
}
// RemoveScientificNotationFromFloat returns a float without any
// scientific notation if the number has any.
// golang does not handle conversion of float64s that have scientific
// notation in them and otherwise stinks. please replace this if you have
// a better implementation.
func RemoveScientificNotationFromFloat(x float64) (float64, error) {
bigNum := strconv.FormatFloat(x, 'g', -1, 64)
breakPoint := strings.IndexAny(bigNum, "Ee")
if breakPoint > 0 {
bigNum = bigNum[:breakPoint]
}
result, err := strconv.ParseFloat(bigNum, 64)
if err != nil {
return x, errors.Wrapf(err, "unable to remove scientific number from calculations")
}
return result, nil
}
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