121 lines
1.8 KiB
Go
121 lines
1.8 KiB
Go
package runc
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import (
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"io"
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"os"
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"os/exec"
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"syscall"
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)
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type IO interface {
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io.Closer
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Stdin() io.WriteCloser
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Stdout() io.ReadCloser
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Stderr() io.ReadCloser
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Set(*exec.Cmd)
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}
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// NewPipeIO creates pipe pairs to be used with runc
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func NewPipeIO(uid, gid int) (i IO, err error) {
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var pipes []*pipe
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// cleanup in case of an error
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defer func() {
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if err != nil {
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for _, p := range pipes {
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p.Close()
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}
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}
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}()
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stdin, err := newPipe(uid, gid)
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if err != nil {
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return nil, err
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}
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pipes = append(pipes, stdin)
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stdout, err := newPipe(uid, gid)
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if err != nil {
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return nil, err
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}
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pipes = append(pipes, stdout)
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stderr, err := newPipe(uid, gid)
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if err != nil {
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return nil, err
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}
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pipes = append(pipes, stderr)
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return &pipeIO{
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in: stdin,
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out: stdout,
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err: stderr,
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}, nil
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}
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func newPipe(uid, gid int) (*pipe, error) {
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r, w, err := os.Pipe()
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if err != nil {
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return nil, err
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}
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if err := syscall.Fchown(int(r.Fd()), uid, gid); err != nil {
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return nil, err
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}
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if err := syscall.Fchown(int(w.Fd()), uid, gid); err != nil {
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return nil, err
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}
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return &pipe{
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r: r,
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w: w,
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}, nil
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}
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type pipe struct {
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r *os.File
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w *os.File
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}
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func (p *pipe) Close() error {
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err := p.r.Close()
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if werr := p.w.Close(); err == nil {
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err = werr
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}
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return err
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}
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type pipeIO struct {
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in *pipe
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out *pipe
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err *pipe
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}
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func (i *pipeIO) Stdin() io.WriteCloser {
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return i.in.w
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}
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func (i *pipeIO) Stdout() io.ReadCloser {
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return i.in.r
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}
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func (i *pipeIO) Stderr() io.ReadCloser {
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return i.in.r
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}
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func (i *pipeIO) Close() error {
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var err error
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for _, v := range []*pipe{
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i.in,
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i.out,
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i.err,
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} {
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if cerr := v.Close(); err == nil {
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err = cerr
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}
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}
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return err
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}
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// Set sets the io to the exec.Cmd
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func (i *pipeIO) Set(cmd *exec.Cmd) {
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cmd.Stdin = i.in.r
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cmd.Stdout = i.out.w
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cmd.Stderr = i.err.w
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}
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