Move third_party code under third_party/src so it can be used in $GOPATH.

third_party/src/bitbucket.org/kardianos/osext/osext_sysctl.go

@@ -0,0 +1,82 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd
+
+package osext
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+var startUpcwd, getwdError = os.Getwd()
+
+func executable() (string, error) {
+	var mib [4]int32
+	switch runtime.GOOS {
+	case "freebsd":
+		mib = [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
+	case "darwin":
+		mib = [4]int32{1 /* CTL_KERN */, 38 /* KERN_PROCARGS */, int32(os.Getpid()), -1}
+	}
+
+	n := uintptr(0)
+	// get length
+	_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if err != 0 {
+		return "", err
+	}
+	if n == 0 { // shouldn't happen
+		return "", nil
+	}
+	buf := make([]byte, n)
+	_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if err != 0 {
+		return "", err
+	}
+	if n == 0 { // shouldn't happen
+		return "", nil
+	}
+	for i, v := range buf {
+		if v == 0 {
+			buf = buf[:i]
+			break
+		}
+	}
+	var strpath string
+	if buf[0] != '/' {
+		var e error
+		if strpath, e = getAbs(buf); e != nil {
+			return strpath, e
+		}
+	} else {
+		strpath = string(buf)
+	}
+	// darwin KERN_PROCARGS may return the path to a symlink rather than the
+	// actual executable
+	if runtime.GOOS == "darwin" {
+		if strpath, err := filepath.EvalSymlinks(strpath); err != nil {
+			return strpath, err
+		}
+	}
+	return strpath, nil
+}
+
+func getAbs(buf []byte) (string, error) {
+	if getwdError != nil {
+		return string(buf), getwdError
+	} else {
+		if buf[0] == '.' {
+			buf = buf[1:]
+		}
+		if startUpcwd[len(startUpcwd)-1] != '/' && buf[0] != '/' {
+			return startUpcwd + "/" + string(buf), nil
+		}
+		return startUpcwd + string(buf), nil
+	}
+}