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90 lines
2 KiB
Go
90 lines
2 KiB
Go
package command
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/docker/docker/pkg/system"
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)
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// CopyToFile writes the content of the reader to the specified file
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func CopyToFile(outfile string, r io.Reader) error {
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// We use sequential file access here to avoid depleting the standby list
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// on Windows. On Linux, this is a call directly to ioutil.TempFile
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tmpFile, err := system.TempFileSequential(filepath.Dir(outfile), ".docker_temp_")
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if err != nil {
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return err
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}
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tmpPath := tmpFile.Name()
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_, err = io.Copy(tmpFile, r)
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tmpFile.Close()
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if err != nil {
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os.Remove(tmpPath)
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return err
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}
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if err = os.Rename(tmpPath, outfile); err != nil {
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os.Remove(tmpPath)
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return err
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}
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return nil
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}
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// capitalizeFirst capitalizes the first character of string
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func capitalizeFirst(s string) string {
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switch l := len(s); l {
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case 0:
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return s
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case 1:
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return strings.ToLower(s)
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default:
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return strings.ToUpper(string(s[0])) + strings.ToLower(s[1:])
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}
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}
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// PrettyPrint outputs arbitrary data for human formatted output by uppercasing the first letter.
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func PrettyPrint(i interface{}) string {
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switch t := i.(type) {
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case nil:
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return "None"
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case string:
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return capitalizeFirst(t)
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default:
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return capitalizeFirst(fmt.Sprintf("%s", t))
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}
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}
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// PromptForConfirmation requests and checks confirmation from user.
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// This will display the provided message followed by ' [y/N] '. If
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// the user input 'y' or 'Y' it returns true other false. If no
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// message is provided "Are you sure you want to proceed? [y/N] "
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// will be used instead.
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func PromptForConfirmation(ins *InStream, outs *OutStream, message string) bool {
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if message == "" {
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message = "Are you sure you want to proceed?"
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}
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message += " [y/N] "
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fmt.Fprintf(outs, message)
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// On Windows, force the use of the regular OS stdin stream.
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if runtime.GOOS == "windows" {
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ins = NewInStream(os.Stdin)
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}
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answer := ""
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n, _ := fmt.Fscan(ins, &answer)
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if n != 1 || (answer != "y" && answer != "Y") {
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return false
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}
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return true
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}
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