dotcloud/docker

package archive

import (
    "fmt"
    "path/filepath"
    "strings"
)

// checkSystemDriveAndRemoveDriveLetter is the Windows implementation
// of CheckSystemDriveAndRemoveDriveLetter
func checkSystemDriveAndRemoveDriveLetter(path string) (string, error) {
    if len(path) == 2 && string(path[1]) == ":" {
        return "", fmt.Errorf("no relative path specified in %q", path)
    }
    if !filepath.IsAbs(path) || len(path) < 2 {
        return filepath.FromSlash(path), nil
    }
    if string(path[1]) == ":" && !strings.EqualFold(string(path[0]), "c") {
        return "", fmt.Errorf("the specified path is not on the system drive (C:)")
    }
    return filepath.FromSlash(path[2:]), nil
}