124 lines
2.6 KiB
Go
124 lines
2.6 KiB
Go
package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"os"
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"path/filepath"
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"sync"
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"syscall"
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"time"
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gocontext "context"
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"github.com/docker/containerd/api/execution"
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"github.com/tonistiigi/fifo"
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"github.com/urfave/cli"
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"google.golang.org/grpc"
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"google.golang.org/grpc/grpclog"
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)
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var grpcConn *grpc.ClientConn
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func prepareStdio(stdin, stdout, stderr string, console bool) (*sync.WaitGroup, error) {
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var wg sync.WaitGroup
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ctx := gocontext.Background()
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f, err := fifo.OpenFifo(ctx, stdin, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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go func(w io.Writer) {
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io.Copy(w, os.Stdin)
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f.Close()
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}(f)
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f, err = fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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wg.Add(1)
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go func(r io.Reader) {
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io.Copy(os.Stdout, r)
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f.Close()
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wg.Done()
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}(f)
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f, err = fifo.OpenFifo(ctx, stderr, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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if !console {
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wg.Add(1)
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go func(r io.Reader) {
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io.Copy(os.Stderr, r)
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f.Close()
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wg.Done()
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}(f)
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}
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return &wg, nil
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}
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func getGRPCConnection(context *cli.Context) (*grpc.ClientConn, error) {
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if grpcConn != nil {
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return grpcConn, nil
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}
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bindSocket := context.GlobalString("socket")
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// reset the logger for grpc to log to dev/null so that it does not mess with our stdio
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grpclog.SetLogger(log.New(ioutil.Discard, "", log.LstdFlags))
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dialOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithTimeout(100 * time.Second)}
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dialOpts = append(dialOpts,
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grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
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return net.DialTimeout("unix", bindSocket, timeout)
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},
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))
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conn, err := grpc.Dial(fmt.Sprintf("unix://%s", bindSocket), dialOpts...)
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if err != nil {
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return nil, err
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}
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grpcConn = conn
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return grpcConn, nil
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}
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func getExecutionService(context *cli.Context) (execution.ExecutionServiceClient, error) {
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conn, err := getGRPCConnection(context)
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if err != nil {
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return nil, err
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}
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return execution.NewExecutionServiceClient(conn), nil
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}
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func getTempDir(id string) (string, error) {
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err := os.MkdirAll(filepath.Join(os.TempDir(), "ctr"), 0700)
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if err != nil {
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return "", err
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}
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tmpDir, err := ioutil.TempDir(filepath.Join(os.TempDir(), "ctr"), fmt.Sprintf("%s-", id))
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if err != nil {
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return "", err
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}
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return tmpDir, nil
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}
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