forked from opencontainers/runc
-
Notifications
You must be signed in to change notification settings - Fork 2
/
utils.go
94 lines (83 loc) · 2.09 KB
/
utils.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
package main
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/sirupsen/logrus"
"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)
}
// parseBoolOrAuto returns (nil, nil) if s is empty or "auto"
func parseBoolOrAuto(s string) (*bool, error) {
if s == "" || strings.ToLower(s) == "auto" {
return nil, nil
}
b, err := strconv.ParseBool(s)
return &b, err
}