Rough first version of the moby tool

- terrible code
- lots needs changing
- can build a Moby from a config yaml that boots

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

vendor/github.com/surma/gocpio/common.go

@@ -0,0 +1,46 @@
+// Package cpio implements access to cpio archives.
+// Implementation of the new ASCII formate (SVR4) defined here:
+// http://people.freebsd.org/~kientzle/libarchive/man/cpio.5.txt
+package cpio
+
+const (
+	VERSION = "1.1.0"
+)
+
+// Header represents file meta data in an archive.
+// Some fields may not be populated.
+type Header struct {
+	Mode     int64 // permission and mode bits.
+	Uid      int   // user id of owner.
+	Gid      int   // group id of owner.
+	Mtime    int64 // modified time; seconds since epoch.
+	Size     int64 // length in bytes.
+	Devmajor int64 // major number of character or block device.
+	Devminor int64 // minor number of character or block device.
+	Type     int64
+	Name     string // name of header file entry.
+}
+
+func (h *Header) IsTrailer() bool {
+	return h.Name == trailer.Name &&
+		h.Uid == trailer.Uid &&
+		h.Gid == trailer.Gid &&
+		h.Mtime == trailer.Mtime
+}
+
+// File types
+const (
+	TYPE_SOCK    = 014
+	TYPE_SYMLINK = 012
+	TYPE_REG     = 010
+	TYPE_BLK     = 006
+	TYPE_DIR     = 004
+	TYPE_CHAR    = 002
+	TYPE_FIFO    = 001
+)
+
+var (
+	trailer = Header{
+		Name: "TRAILER!!!",
+	}
+)