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