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package libpod
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/containers/image/signature"
"github.com/containers/image/types"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
// 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(baseDir); err != nil {
return err
}
}
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
f.WriteString(content)
f.Sync()
return nil
}
// 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)
}
// 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)
}
// RemoveScientificNotationFromFloat returns a float without any
// scientific notation if the number has any.
// golang does not handle conversion of float64s that have scientific
// notation in them and otherwise stinks. please replace this if you have
// a better implementation.
func RemoveScientificNotationFromFloat(x float64) (float64, error) {
bigNum := strconv.FormatFloat(x, 'g', -1, 64)
breakPoint := strings.IndexAny(bigNum, "Ee")
if breakPoint > 0 {
bigNum = bigNum[:breakPoint]
}
result, err := strconv.ParseFloat(bigNum, 64)
if err != nil {
return x, errors.Wrapf(err, "unable to remove scientific number from calculations")
}
return result, nil
}
// MountExists returns true if dest exists in the list of mounts
func MountExists(specMounts []spec.Mount, dest string) bool {
for _, m := range specMounts {
if m.Destination == dest {
return true
}
}
return false
}
// WaitForFile waits until a file has been created or the given timeout has occurred
func WaitForFile(path string, timeout time.Duration) error {
done := make(chan struct{})
chControl := make(chan struct{})
go func() {
for {
select {
case <-chControl:
return
default:
_, err := os.Stat(path)
if err == nil {
close(done)
return
}
time.Sleep(25 * time.Millisecond)
}
}
}()
select {
case <-done:
return nil
case <-time.After(timeout):
close(chControl)
return errors.Wrapf(ErrInternal, "timed out waiting for file %s", path)
}
}
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