168 lines
3.0 KiB
Go
168 lines
3.0 KiB
Go
package containerd
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"sync"
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)
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type IO struct {
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Terminal bool
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Stdin string
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Stdout string
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Stderr string
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closer *wgCloser
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}
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func (i *IO) Cancel() {
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if i.closer == nil {
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return
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}
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i.closer.Cancel()
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}
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func (i *IO) Wait() {
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if i.closer == nil {
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return
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}
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i.closer.Wait()
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}
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func (i *IO) Close() error {
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if i.closer == nil {
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return nil
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}
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return i.closer.Close()
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}
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type IOCreation func() (*IO, error)
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type IOAttach func(*FIFOSet) (*IO, error)
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func NewIO(stdin io.Reader, stdout, stderr io.Writer) IOCreation {
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return NewIOWithTerminal(stdin, stdout, stderr, false)
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}
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func NewIOWithTerminal(stdin io.Reader, stdout, stderr io.Writer, terminal bool) IOCreation {
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return func() (*IO, error) {
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paths, err := NewFifos()
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if err != nil {
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return nil, err
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}
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i := &IO{
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Terminal: terminal,
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Stdout: paths.Out,
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Stderr: paths.Err,
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Stdin: paths.In,
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}
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set := &ioSet{
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in: stdin,
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out: stdout,
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err: stderr,
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}
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closer, err := copyIO(paths, set, i.Terminal)
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if err != nil {
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return nil, err
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}
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i.closer = closer
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return i, nil
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}
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}
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func WithAttach(stdin io.Reader, stdout, stderr io.Writer) IOAttach {
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return func(paths *FIFOSet) (*IO, error) {
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if paths == nil {
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return nil, fmt.Errorf("cannot attach to existing fifos")
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}
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i := &IO{
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Terminal: paths.Terminal,
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Stdout: paths.Out,
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Stderr: paths.Err,
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Stdin: paths.In,
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}
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set := &ioSet{
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in: stdin,
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out: stdout,
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err: stderr,
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}
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closer, err := copyIO(paths, set, i.Terminal)
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if err != nil {
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return nil, err
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}
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i.closer = closer
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return i, nil
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}
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}
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// Stdio returns an IO implementation to be used for a task
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// that outputs the container's IO as the current processes Stdio
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func Stdio() (*IO, error) {
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return NewIO(os.Stdin, os.Stdout, os.Stderr)()
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}
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// StdioTerminal will setup the IO for the task to use a terminal
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func StdioTerminal() (*IO, error) {
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return NewIOWithTerminal(os.Stdin, os.Stdout, os.Stderr, true)()
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}
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// NewFifos returns a new set of fifos for the task
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func NewFifos() (*FIFOSet, error) {
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root := filepath.Join(os.TempDir(), "containerd")
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if err := os.MkdirAll(root, 0700); err != nil {
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return nil, err
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}
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dir, err := ioutil.TempDir(root, "")
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if err != nil {
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return nil, err
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}
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return &FIFOSet{
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Dir: dir,
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In: filepath.Join(dir, "stdin"),
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Out: filepath.Join(dir, "stdout"),
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Err: filepath.Join(dir, "stderr"),
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}, nil
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}
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type FIFOSet struct {
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// Dir is the directory holding the task fifos
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Dir string
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In, Out, Err string
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Terminal bool
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}
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type ioSet struct {
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in io.Reader
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out, err io.Writer
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}
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type wgCloser struct {
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wg *sync.WaitGroup
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dir string
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set []io.Closer
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cancel context.CancelFunc
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}
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func (g *wgCloser) Wait() {
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g.wg.Wait()
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}
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func (g *wgCloser) Close() error {
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for _, f := range g.set {
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f.Close()
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}
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if g.dir != "" {
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return os.RemoveAll(g.dir)
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}
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return nil
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}
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func (g *wgCloser) Cancel() {
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g.cancel()
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}
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