summaryrefslogtreecommitdiff
path: root/libpod/util.go
blob: 61089b525b9f556d3c2cac0426c0ccfbe88a02c6 (plain)
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
package libpod

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/containers/image/signature"
	"github.com/containers/image/types"
)

// Runtime API constants
const (
	// DefaultTransport is a prefix that we apply to an image name
	// to check docker hub first for the image
	DefaultTransport = "docker://"
)

// WriteFile writes a provided string to a provided path
func WriteFile(content string, path string) error {
	baseDir := filepath.Dir(path)
	if baseDir != "" {
		if _, err := os.Stat(path); err != nil {
			return err
		}
	}
	f, err := os.Create(path)
	if err != nil {
		return err
	}
	defer f.Close()
	f.WriteString(content)
	f.Sync()
	return nil
}

// StringInSlice determines if a string is in a string slice, returns bool
func StringInSlice(s string, sl []string) bool {
	for _, i := range sl {
		if i == s {
			return true
		}
	}
	return false
}

// FuncTimer helps measure the execution time of a function
// For debug purposes, do not leave in code
// used like defer FuncTimer("foo")
func FuncTimer(funcName string) {
	elapsed := time.Since(time.Now())
	fmt.Printf("%s executed in %d ms\n", funcName, elapsed)
}

// hasTransport determines if the image string contains '://', returns bool
func hasTransport(image string) bool {
	return strings.Contains(image, "://")
}

// CopyStringStringMap deep copies a map[string]string and returns the result
func CopyStringStringMap(m map[string]string) map[string]string {
	n := map[string]string{}
	for k, v := range m {
		n[k] = v
	}
	return n
}

// GetPolicyContext creates a signature policy context for the given signature policy path
func GetPolicyContext(path string) (*signature.PolicyContext, error) {
	policy, err := signature.DefaultPolicy(&types.SystemContext{SignaturePolicyPath: path})
	if err != nil {
		return nil, err
	}
	return signature.NewPolicyContext(policy)
}