add functions/vendor files

vendor/github.com/opencontainers/runc/utils.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/urfave/cli"
+)
+
+const (
+	exactArgs = iota
+	minArgs
+	maxArgs
+)
+
+func checkArgs(context *cli.Context, expected, checkType int) error {
+	var err error
+	cmdName := context.Command.Name
+	switch checkType {
+	case exactArgs:
+		if context.NArg() != expected {
+			err = fmt.Errorf("%s: %q requires exactly %d argument(s)", os.Args[0], cmdName, expected)
+		}
+	case minArgs:
+		if context.NArg() < expected {
+			err = fmt.Errorf("%s: %q requires a minimum of %d argument(s)", os.Args[0], cmdName, expected)
+		}
+	case maxArgs:
+		if context.NArg() > expected {
+			err = fmt.Errorf("%s: %q requires a maximum of %d argument(s)", os.Args[0], cmdName, expected)
+		}
+	}
+
+	if err != nil {
+		fmt.Printf("Incorrect Usage.\n\n")
+		cli.ShowCommandHelp(context, cmdName)
+		return err
+	}
+	return nil
+}
+
+// fatal prints the error's details if it is a libcontainer specific error type
+// then exits the program with an exit status of 1.
+func fatal(err error) {
+	// make sure the error is written to the logger
+	logrus.Error(err)
+	fmt.Fprintln(os.Stderr, err)
+	os.Exit(1)
+}
+
+// setupSpec performs initial setup based on the cli.Context for the container
+func setupSpec(context *cli.Context) (*specs.Spec, error) {
+	bundle := context.String("bundle")
+	if bundle != "" {
+		if err := os.Chdir(bundle); err != nil {
+			return nil, err
+		}
+	}
+	spec, err := loadSpec(specConfig)
+	if err != nil {
+		return nil, err
+	}
+	return spec, nil
+}
+
+func revisePidFile(context *cli.Context) error {
+	pidFile := context.String("pid-file")
+	if pidFile == "" {
+		return nil
+	}
+
+	// convert pid-file to an absolute path so we can write to the right
+	// file after chdir to bundle
+	pidFile, err := filepath.Abs(pidFile)
+	if err != nil {
+		return err
+	}
+	return context.Set("pid-file", pidFile)
+}