Vendor continuity

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

vendor/github.com/stevvooe/continuity/devices_unix.go

@@ -0,0 +1,55 @@
+// +build linux darwin
+
+package continuity
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+func deviceInfo(fi os.FileInfo) (uint64, uint64, error) {
+	sys, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return 0, 0, fmt.Errorf("cannot extract device from os.FileInfo")
+	}
+
+	return getmajor(sys.Rdev), getminor(sys.Rdev), nil
+}
+
+// mknod provides a shortcut for syscall.Mknod
+func mknod(p string, mode os.FileMode, maj, min int) error {
+	var (
+		m   = syscallMode(mode.Perm())
+		dev int
+	)
+
+	if mode&os.ModeDevice != 0 {
+		dev = makedev(maj, min)
+
+		if mode&os.ModeCharDevice != 0 {
+			m |= syscall.S_IFCHR
+		} else {
+			m |= syscall.S_IFBLK
+		}
+	} else if mode&os.ModeNamedPipe != 0 {
+		m |= syscall.S_IFIFO
+	}
+
+	return syscall.Mknod(p, m, dev)
+}
+
+// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
+func syscallMode(i os.FileMode) (o uint32) {
+	o |= uint32(i.Perm())
+	if i&os.ModeSetuid != 0 {
+		o |= syscall.S_ISUID
+	}
+	if i&os.ModeSetgid != 0 {
+		o |= syscall.S_ISGID
+	}
+	if i&os.ModeSticky != 0 {
+		o |= syscall.S_ISVTX
+	}
+	return
+}