Build and install from GOPATH

* Rename 'vendor/src' -> 'vendor'
  * Ignore vendor/ instead of vendor/src/ for lint
* Rename 'cmd/client' -> 'cmd/ocic' to make it 'go install'able
* Rename 'cmd/server' -> 'cmd/ocid' to make it 'go install'able
* Update Makefile to build and install from GOPATH
* Update tests to locate ocid/ocic in GOPATH/bin
* Search for binaries in GOPATH/bin instead of PATH
* Install tools using `go get -u`, so they are updated on each run

Signed-off-by: Jonathan Yu <jawnsy@redhat.com>

vendor/github.com/containers/storage/drivers/driver.go

@@ -0,0 +1,243 @@
+package graphdriver
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/vbatts/tar-split/tar/storage"
+
+	"github.com/containers/storage/pkg/archive"
+	"github.com/containers/storage/pkg/idtools"
+)
+
+// FsMagic unsigned id of the filesystem in use.
+type FsMagic uint32
+
+const (
+	// FsMagicUnsupported is a predefined constant value other than a valid filesystem id.
+	FsMagicUnsupported = FsMagic(0x00000000)
+)
+
+var (
+	// All registered drivers
+	drivers map[string]InitFunc
+
+	// ErrNotSupported returned when driver is not supported.
+	ErrNotSupported = errors.New("driver not supported")
+	// ErrPrerequisites retuned when driver does not meet prerequisites.
+	ErrPrerequisites = errors.New("prerequisites for driver not satisfied (wrong filesystem?)")
+	// ErrIncompatibleFS returned when file system is not supported.
+	ErrIncompatibleFS = fmt.Errorf("backing file system is unsupported for this graph driver")
+)
+
+// InitFunc initializes the storage driver.
+type InitFunc func(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error)
+
+// ProtoDriver defines the basic capabilities of a driver.
+// This interface exists solely to be a minimum set of methods
+// for client code which choose not to implement the entire Driver
+// interface and use the NaiveDiffDriver wrapper constructor.
+//
+// Use of ProtoDriver directly by client code is not recommended.
+type ProtoDriver interface {
+	// String returns a string representation of this driver.
+	String() string
+	// CreateReadWrite creates a new, empty filesystem layer that is ready
+	// to be used as the storage for a container.
+	CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error
+	// Create creates a new, empty, filesystem layer with the
+	// specified id and parent and mountLabel. Parent and mountLabel may be "".
+	Create(id, parent, mountLabel string, storageOpt map[string]string) error
+	// Remove attempts to remove the filesystem layer with this id.
+	Remove(id string) error
+	// Get returns the mountpoint for the layered filesystem referred
+	// to by this id. You can optionally specify a mountLabel or "".
+	// Returns the absolute path to the mounted layered filesystem.
+	Get(id, mountLabel string) (dir string, err error)
+	// Put releases the system resources for the specified id,
+	// e.g, unmounting layered filesystem.
+	Put(id string) error
+	// Exists returns whether a filesystem layer with the specified
+	// ID exists on this driver.
+	Exists(id string) bool
+	// Status returns a set of key-value pairs which give low
+	// level diagnostic status about this driver.
+	Status() [][2]string
+	// Returns a set of key-value pairs which give low level information
+	// about the image/container driver is managing.
+	GetMetadata(id string) (map[string]string, error)
+	// Cleanup performs necessary tasks to release resources
+	// held by the driver, e.g., unmounting all layered filesystems
+	// known to this driver.
+	Cleanup() error
+}
+
+// Driver is the interface for layered/snapshot file system drivers.
+type Driver interface {
+	ProtoDriver
+	// Diff produces an archive of the changes between the specified
+	// layer and its parent layer which may be "".
+	Diff(id, parent string) (archive.Archive, error)
+	// Changes produces a list of changes between the specified layer
+	// and its parent layer. If parent is "", then all changes will be ADD changes.
+	Changes(id, parent string) ([]archive.Change, error)
+	// ApplyDiff extracts the changeset from the given diff into the
+	// layer with the specified id and parent, returning the size of the
+	// new layer in bytes.
+	// The archive.Reader must be an uncompressed stream.
+	ApplyDiff(id, parent string, diff archive.Reader) (size int64, err error)
+	// DiffSize calculates the changes between the specified id
+	// and its parent and returns the size in bytes of the changes
+	// relative to its base filesystem directory.
+	DiffSize(id, parent string) (size int64, err error)
+}
+
+// DiffGetterDriver is the interface for layered file system drivers that
+// provide a specialized function for getting file contents for tar-split.
+type DiffGetterDriver interface {
+	Driver
+	// DiffGetter returns an interface to efficiently retrieve the contents
+	// of files in a layer.
+	DiffGetter(id string) (FileGetCloser, error)
+}
+
+// FileGetCloser extends the storage.FileGetter interface with a Close method
+// for cleaning up.
+type FileGetCloser interface {
+	storage.FileGetter
+	// Close cleans up any resources associated with the FileGetCloser.
+	Close() error
+}
+
+// Checker makes checks on specified filesystems.
+type Checker interface {
+	// IsMounted returns true if the provided path is mounted for the specific checker
+	IsMounted(path string) bool
+}
+
+func init() {
+	drivers = make(map[string]InitFunc)
+}
+
+// Register registers an InitFunc for the driver.
+func Register(name string, initFunc InitFunc) error {
+	if _, exists := drivers[name]; exists {
+		return fmt.Errorf("Name already registered %s", name)
+	}
+	drivers[name] = initFunc
+
+	return nil
+}
+
+// GetDriver initializes and returns the registered driver
+func GetDriver(name, home string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
+	if initFunc, exists := drivers[name]; exists {
+		return initFunc(filepath.Join(home, name), options, uidMaps, gidMaps)
+	}
+	if pluginDriver, err := lookupPlugin(name, home, options); err == nil {
+		return pluginDriver, nil
+	}
+	logrus.Errorf("Failed to GetDriver graph %s %s", name, home)
+	return nil, ErrNotSupported
+}
+
+// getBuiltinDriver initializes and returns the registered driver, but does not try to load from plugins
+func getBuiltinDriver(name, home string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
+	if initFunc, exists := drivers[name]; exists {
+		return initFunc(filepath.Join(home, name), options, uidMaps, gidMaps)
+	}
+	logrus.Errorf("Failed to built-in GetDriver graph %s %s", name, home)
+	return nil, ErrNotSupported
+}
+
+// New creates the driver and initializes it at the specified root.
+func New(root string, name string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
+	if name != "" {
+		logrus.Debugf("[graphdriver] trying provided driver %q", name) // so the logs show specified driver
+		return GetDriver(name, root, options, uidMaps, gidMaps)
+	}
+
+	// Guess for prior driver
+	driversMap := scanPriorDrivers(root)
+	for _, name := range priority {
+		if name == "vfs" {
+			// don't use vfs even if there is state present.
+			continue
+		}
+		if _, prior := driversMap[name]; prior {
+			// of the state found from prior drivers, check in order of our priority
+			// which we would prefer
+			driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
+			if err != nil {
+				// unlike below, we will return error here, because there is prior
+				// state, and now it is no longer supported/prereq/compatible, so
+				// something changed and needs attention. Otherwise the daemon's
+				// images would just "disappear".
+				logrus.Errorf("[graphdriver] prior storage driver %q failed: %s", name, err)
+				return nil, err
+			}
+
+			// abort starting when there are other prior configured drivers
+			// to ensure the user explicitly selects the driver to load
+			if len(driversMap)-1 > 0 {
+				var driversSlice []string
+				for name := range driversMap {
+					driversSlice = append(driversSlice, name)
+				}
+
+				return nil, fmt.Errorf("%q contains several valid graphdrivers: %s; Please cleanup or explicitly choose storage driver (-s <DRIVER>)", root, strings.Join(driversSlice, ", "))
+			}
+
+			logrus.Infof("[graphdriver] using prior storage driver %q", name)
+			return driver, nil
+		}
+	}
+
+	// Check for priority drivers first
+	for _, name := range priority {
+		driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
+		if err != nil {
+			if isDriverNotSupported(err) {
+				continue
+			}
+			return nil, err
+		}
+		return driver, nil
+	}
+
+	// Check all registered drivers if no priority driver is found
+	for name, initFunc := range drivers {
+		driver, err := initFunc(filepath.Join(root, name), options, uidMaps, gidMaps)
+		if err != nil {
+			if isDriverNotSupported(err) {
+				continue
+			}
+			return nil, err
+		}
+		return driver, nil
+	}
+	return nil, fmt.Errorf("No supported storage backend found")
+}
+
+// isDriverNotSupported returns true if the error initializing
+// the graph driver is a non-supported error.
+func isDriverNotSupported(err error) bool {
+	return err == ErrNotSupported || err == ErrPrerequisites || err == ErrIncompatibleFS
+}
+
+// scanPriorDrivers returns an un-ordered scan of directories of prior storage drivers
+func scanPriorDrivers(root string) map[string]bool {
+	driversMap := make(map[string]bool)
+
+	for driver := range drivers {
+		p := filepath.Join(root, driver)
+		if _, err := os.Stat(p); err == nil && driver != "vfs" {
+			driversMap[driver] = true
+		}
+	}
+	return driversMap
+}