Revendor virtsock go library, for vsock.Dial

$ gvt delete github.com/rneugeba/virtsock/go
$ gvt fetch --no-recurse https://github.com/rneugeba/virtsock/go

virtsock.git:

$ git log --oneline 74097e05a883e89c70e6a27b342672c7fe6c846b..650ef8224a0c06b4b20e9bee1600dbf677c8176d -- go/
0e2f0a8 vsock: Implement vsock.Dial
712714a vsock: include the errno when C.bind_sockaddr_vm
03725fe go: make errors public

Signed-off-by: Ian Campbell <ian.campbell@docker.com>

alpine/packages/go/vendor/github.com/rneugeba/virtsock/go/hvsock/hvsock.go

@@ -173,13 +173,13 @@ func (v *hvsockListener) Addr() net.Addr {
  */
 
 var (
-	errSocketClosed        = errors.New("HvSocket has already been closed")
-	errSocketWriteClosed   = errors.New("HvSocket has been closed for write")
-	errSocketReadClosed    = errors.New("HvSocket has been closed for read")
-	errSocketMsgSize       = errors.New("HvSocket message was of wrong size")
-	errSocketMsgWrite      = errors.New("HvSocket writing message")
-	errSocketNotEnoughData = errors.New("HvSocket not enough data written")
-	errSocketUnImplemented = errors.New("Function not implemented")
+	ErrSocketClosed        = errors.New("HvSocket has already been closed")
+	ErrSocketWriteClosed   = errors.New("HvSocket has been closed for write")
+	ErrSocketReadClosed    = errors.New("HvSocket has been closed for read")
+	ErrSocketMsgSize       = errors.New("HvSocket message was of wrong size")
+	ErrSocketMsgWrite      = errors.New("HvSocket writing message")
+	ErrSocketNotEnoughData = errors.New("HvSocket not enough data written")
+	ErrSocketUnImplemented = errors.New("Function not implemented")
 )
 
 type HVsockConn struct {
@@ -227,7 +227,7 @@ func (v *HVsockConn) Close() error {
 
 func (v *HVsockConn) CloseRead() error {
 	if v.readClosed {
-		return errSocketReadClosed
+		return ErrSocketReadClosed
 	}
 
 	prDebug("TX: Shutdown Read\n")
@@ -244,7 +244,7 @@ func (v *HVsockConn) CloseRead() error {
 
 func (v *HVsockConn) CloseWrite() error {
 	if v.writeClosed {
-		return errSocketWriteClosed
+		return ErrSocketWriteClosed
 	}
 
 	prDebug("TX: Shutdown Write\n")
@@ -284,7 +284,7 @@ func (v *HVsockConn) Read(buf []byte) (int, error) {
 			}
 
 			if n != 4 {
-				return n, errSocketMsgSize
+				return n, ErrSocketMsgSize
 			}
 
 			msg := int(binary.LittleEndian.Uint32(b))
@@ -333,7 +333,7 @@ func (v *HVsockConn) Read(buf []byte) (int, error) {
 
 func (v *HVsockConn) Write(buf []byte) (int, error) {
 	if v.writeClosed {
-		return 0, errSocketWriteClosed
+		return 0, ErrSocketWriteClosed
 	}
 
 	var err error
@@ -344,7 +344,7 @@ func (v *HVsockConn) Write(buf []byte) (int, error) {
 
 	for toWrite > 0 {
 		if v.writeClosed {
-			return 0, errSocketWriteClosed
+			return 0, ErrSocketWriteClosed
 		}
 
 		// We write batches of MSG + data which need to be
@@ -371,7 +371,7 @@ func (v *HVsockConn) Write(buf []byte) (int, error) {
 		}
 		if n != thisBatch {
 			prDebug("Write Error 4\n")
-			err = errSocketNotEnoughData
+			err = ErrSocketNotEnoughData
 			goto ErrOut
 		}
 		toWrite -= n
@@ -402,7 +402,7 @@ func (v *HVsockConn) sendMsg(msg uint32) error {
 		return err
 	}
 	if n != len(b) {
-		return errSocketMsgWrite
+		return ErrSocketMsgWrite
 	}
 	return nil
 }

alpine/packages/go/vendor/github.com/rneugeba/virtsock/go/hvsock/hvsock_darwin.go

@@ -1,6 +1,7 @@
 // Dummy implementation to compile on Mac OSX
 
 package hvsock
+
 import (
 	"errors"
 	"time"

alpine/packages/go/vendor/github.com/rneugeba/virtsock/go/hvsock/hvsock_windows.go

@@ -240,7 +240,7 @@ func (v *hvsockConn) closeHandle() {
 func (s *hvsockConn) prepareIo() (*ioOperation, error) {
 	s.wg.Add(1)
 	if s.closing {
-		return nil, errSocketClosed
+		return nil, ErrSocketClosed
 	}
 	c := &ioOperation{}
 	c.ch = make(chan ioResult)
@@ -299,7 +299,7 @@ func (v *hvsockConn) asyncIo(c *ioOperation, deadline time.Time, bytes uint32, e
 	err = r.err
 	if err == syscall.ERROR_OPERATION_ABORTED {
 		if v.closing {
-			err = errSocketClosed
+			err = ErrSocketClosed
 		} else if timedout {
 			err = errTimeout
 		}

alpine/packages/go/vendor/github.com/rneugeba/virtsock/go/vsock/vsock_linux.go

@@ -37,11 +37,33 @@ int accept_vm(int fd, struct sockaddr_vm *sa_vm, socklen_t *sa_vm_len) {
 import "C"
 
 const (
-	AF_VSOCK       = 40
-	VSOCK_CID_ANY  = 4294967295 /* 2^32-1 */
-	VSOCK_CID_SELF = 3
+	AF_VSOCK             = 40
+	VSOCK_CID_ANY        = 4294967295 /* 2^32-1 */
+	VSOCK_CID_HYPERVISOR = 0
+	VSOCK_CID_HOST       = 2
+	VSOCK_CID_SELF       = 3
 )
 
+func Dial(cid, port uint) (Conn, error) {
+	fd, err := syscall.Socket(AF_VSOCK, syscall.SOCK_STREAM, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	sa := C.struct_sockaddr_vm{}
+	sa.svm_family = AF_VSOCK
+	sa.svm_port = C.uint(port)
+	sa.svm_cid = C.uint(cid)
+
+	if ret, errno := C.connect_sockaddr_vm(C.int(fd), &sa); ret != 0 {
+		return nil, errors.New(fmt.Sprintf(
+			"failed bind connect to %08x.%08x, returned %d, errno %d: %s",
+			sa.svm_cid, sa.svm_port, ret, errno, errno))
+	}
+
+	return newVsockConn(uintptr(fd), port)
+}
+
 // Listen returns a net.Listener which can accept connections on the given
 // vhan port.
 func Listen(port uint) (net.Listener, error) {
@@ -55,8 +77,10 @@ func Listen(port uint) (net.Listener, error) {
 	sa.svm_port = C.uint(port)
 	sa.svm_cid = VSOCK_CID_ANY
 
-	if ret := C.bind_sockaddr_vm(C.int(accept_fd), &sa); ret != 0 {
-		return nil, errors.New(fmt.Sprintf("failed bind vsock connection to %08x.%08x, returned %d", sa.svm_cid, sa.svm_port, ret))
+	if ret, errno := C.bind_sockaddr_vm(C.int(accept_fd), &sa); ret != 0 {
+		return nil, errors.New(fmt.Sprintf(
+			"failed bind vsock connection to %08x.%08x, returned %d, errno %d: %s",
+			sa.svm_cid, sa.svm_port, ret, errno, errno))
 	}
 
 	err = syscall.Listen(accept_fd, syscall.SOMAXCONN)

alpine/packages/go/vendor/manifest

@@ -5,7 +5,7 @@
 			"importpath": "github.com/rneugeba/virtsock/go",
 			"repository": "https://github.com/rneugeba/virtsock",
 			"vcs": "git",
-			"revision": "74097e05a883e89c70e6a27b342672c7fe6c846b",
+			"revision": "650ef8224a0c06b4b20e9bee1600dbf677c8176d",
 			"branch": "master",
 			"path": "/go",
 			"notests": true