Reduce general binding binary size

when using the bindings to *only* make a connection, the binary was
rough 28MB.  This PR reduces it down to 11.  There is more work to do
but it will come in a secondary PR.

Signed-off-by: baude <bbaude@redhat.com>

vendor/github.com/containers/common/pkg/parse/parse.go

@@ -0,0 +1,157 @@
+package parse
+
+// this package contains functions that parse and validate
+// user input and is shared either amongst container engine subcommands
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// ValidateVolumeOpts validates a volume's options
+func ValidateVolumeOpts(options []string) ([]string, error) {
+	var foundRootPropagation, foundRWRO, foundLabelChange, bindType, foundExec, foundDev, foundSuid int
+	finalOpts := make([]string, 0, len(options))
+	for _, opt := range options {
+		switch opt {
+		case "noexec", "exec":
+			foundExec++
+			if foundExec > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 'noexec' or 'exec' option", strings.Join(options, ", "))
+			}
+		case "nodev", "dev":
+			foundDev++
+			if foundDev > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 'nodev' or 'dev' option", strings.Join(options, ", "))
+			}
+		case "nosuid", "suid":
+			foundSuid++
+			if foundSuid > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 'nosuid' or 'suid' option", strings.Join(options, ", "))
+			}
+		case "rw", "ro":
+			foundRWRO++
+			if foundRWRO > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 'rw' or 'ro' option", strings.Join(options, ", "))
+			}
+		case "z", "Z", "O":
+			foundLabelChange++
+			if foundLabelChange > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 'z', 'Z', or 'O' option", strings.Join(options, ", "))
+			}
+		case "private", "rprivate", "shared", "rshared", "slave", "rslave", "unbindable", "runbindable":
+			foundRootPropagation++
+			if foundRootPropagation > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 '[r]shared', '[r]private', '[r]slave' or '[r]unbindable' option", strings.Join(options, ", "))
+			}
+		case "bind", "rbind":
+			bindType++
+			if bindType > 1 {
+				return nil, errors.Errorf("invalid options %q, can only specify 1 '[r]bind' option", strings.Join(options, ", "))
+			}
+		case "cached", "delegated":
+			// The discarded ops are OS X specific volume options
+			// introduced in a recent Docker version.
+			// They have no meaning on Linux, so here we silently
+			// drop them. This matches Docker's behavior (the options
+			// are intended to be always safe to use, even not on OS
+			// X).
+			continue
+		default:
+			return nil, errors.Errorf("invalid option type %q", opt)
+		}
+		finalOpts = append(finalOpts, opt)
+	}
+	return finalOpts, nil
+}
+
+// Device parses device mapping string to a src, dest & permissions string
+// Valid values for device looklike:
+//    '/dev/sdc"
+//    '/dev/sdc:/dev/xvdc"
+//    '/dev/sdc:/dev/xvdc:rwm"
+//    '/dev/sdc:rm"
+func Device(device string) (src, dest, permissions string, err error) {
+	permissions = "rwm"
+	arr := strings.Split(device, ":")
+	switch len(arr) {
+	case 3:
+		if !isValidDeviceMode(arr[2]) {
+			return "", "", "", errors.Errorf("invalid device mode: %s", arr[2])
+		}
+		permissions = arr[2]
+		fallthrough
+	case 2:
+		if isValidDeviceMode(arr[1]) {
+			permissions = arr[1]
+		} else {
+			if arr[1] == "" || arr[1][0] != '/' {
+				return "", "", "", errors.Errorf("invalid device mode: %s", arr[1])
+			}
+			dest = arr[1]
+		}
+		fallthrough
+	case 1:
+		if len(arr[0]) > 0 {
+			src = arr[0]
+			break
+		}
+		fallthrough
+	default:
+		return "", "", "", errors.Errorf("invalid device specification: %s", device)
+	}
+
+	if dest == "" {
+		dest = src
+	}
+	return src, dest, permissions, nil
+}
+
+// isValidDeviceMode checks if the mode for device is valid or not.
+// isValid mode is a composition of r (read), w (write), and m (mknod).
+func isValidDeviceMode(mode string) bool {
+	var legalDeviceMode = map[rune]bool{
+		'r': true,
+		'w': true,
+		'm': true,
+	}
+	if mode == "" {
+		return false
+	}
+	for _, c := range mode {
+		if !legalDeviceMode[c] {
+			return false
+		}
+		legalDeviceMode[c] = false
+	}
+	return true
+}
+
+// ValidateVolumeHostDir validates a volume mount's source directory
+func ValidateVolumeHostDir(hostDir string) error {
+	if hostDir == "" {
+		return errors.Errorf("host directory cannot be empty")
+	}
+	if filepath.IsAbs(hostDir) {
+		if _, err := os.Stat(hostDir); err != nil {
+			return errors.Wrapf(err, "error checking path %q", hostDir)
+		}
+	}
+	// If hostDir is not an absolute path, that means the user wants to create a
+	// named volume. This will be done later on in the code.
+	return nil
+}
+
+// ValidateVolumeCtrDir validates a volume mount's destination directory.
+func ValidateVolumeCtrDir(ctrDir string) error {
+	if ctrDir == "" {
+		return errors.Errorf("container directory cannot be empty")
+	}
+	if !filepath.IsAbs(ctrDir) {
+		return errors.Errorf("invalid container path %q, must be an absolute path", ctrDir)
+	}
+	return nil
+}