updated vendored kr/pty to the current master + Solaris support:

https://github.com/kr/pty/pull/64

vendor/github.com/kr/pty/run.go

@@ -1,3 +1,5 @@
+// +build !windows
+
 package pty
 
 import (
@@ -10,15 +12,35 @@ import (
 // and c.Stderr, calls c.Start, and returns the File of the tty's
 // corresponding pty.
 func Start(c *exec.Cmd) (pty *os.File, err error) {
+	return StartWithSize(c, nil)
+}
+
+// StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
+// and c.Stderr, calls c.Start, and returns the File of the tty's
+// corresponding pty.
+//
+// This will resize the pty to the specified size before starting the command
+func StartWithSize(c *exec.Cmd, sz *Winsize) (pty *os.File, err error) {
 	pty, tty, err := Open()
 	if err != nil {
 		return nil, err
 	}
 	defer tty.Close()
+	if sz != nil {
+		err = Setsize(pty, sz)
+		if err != nil {
+			pty.Close()
+			return nil, err
+		}
+	}
 	c.Stdout = tty
 	c.Stdin = tty
 	c.Stderr = tty
-	c.SysProcAttr = &syscall.SysProcAttr{Setctty: true, Setsid: true}
+	if c.SysProcAttr == nil {
+		c.SysProcAttr = &syscall.SysProcAttr{}
+	}
+	c.SysProcAttr.Setctty = true
+	c.SysProcAttr.Setsid = true
 	err = c.Start()
 	if err != nil {
 		pty.Close()