66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package shim
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import (
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"context"
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"net"
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"os"
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"syscall"
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"time"
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winio "github.com/Microsoft/go-winio"
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"github.com/pkg/errors"
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)
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const shimBinaryFormat = "containerd-shim-%s-%s.exe"
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func getSysProcAttr() *syscall.SysProcAttr {
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return nil
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}
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// AnonDialer returns a dialer for a npipe
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func AnonDialer(address string, timeout time.Duration) (net.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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// If there is nobody serving the pipe we limit the timeout for this case to
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// 5 seconds because any shim that would serve this endpoint should serve it
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// within 5 seconds.
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serveTimer := time.NewTimer(5 * time.Second)
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defer serveTimer.Stop()
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for {
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c, err := winio.DialPipeContext(ctx, address)
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if err != nil {
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if os.IsNotExist(err) {
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select {
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case <-serveTimer.C:
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return nil, errors.Wrap(os.ErrNotExist, "pipe not found before timeout")
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default:
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// Wait 10ms for the shim to serve and try again.
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time.Sleep(10 * time.Millisecond)
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continue
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}
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} else if err == context.DeadlineExceeded {
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return nil, errors.Wrapf(err, "timed out waiting for npipe %s", address)
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}
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return nil, err
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}
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return c, nil
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}
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}
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