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moby--moby/builder/dockerfile/dispatchers_windows.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

95 lines
3.3 KiB
Go

package dockerfile // import "github.com/docker/docker/builder/dockerfile"
import (
"errors"
"fmt"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"github.com/docker/docker/pkg/system"
)
var pattern = regexp.MustCompile(`^[a-zA-Z]:\.$`)
// normalizeWorkdir normalizes a user requested working directory in a
// platform semantically consistent way.
func normalizeWorkdir(platform string, current string, requested string) (string, error) {
if platform == "" {
platform = "windows"
}
if platform == "windows" {
return normalizeWorkdirWindows(current, requested)
}
return normalizeWorkdirUnix(current, requested)
}
// normalizeWorkdirUnix normalizes a user requested working directory in a
// platform semantically consistent way.
func normalizeWorkdirUnix(current string, requested string) (string, error) {
if requested == "" {
return "", errors.New("cannot normalize nothing")
}
current = strings.Replace(current, string(os.PathSeparator), "/", -1)
requested = strings.Replace(requested, string(os.PathSeparator), "/", -1)
if !path.IsAbs(requested) {
return path.Join(`/`, current, requested), nil
}
return requested, nil
}
// normalizeWorkdirWindows normalizes a user requested working directory in a
// platform semantically consistent way.
func normalizeWorkdirWindows(current string, requested string) (string, error) {
if requested == "" {
return "", errors.New("cannot normalize nothing")
}
// `filepath.Clean` will replace "" with "." so skip in that case
if current != "" {
current = filepath.Clean(current)
}
if requested != "" {
requested = filepath.Clean(requested)
}
// If either current or requested in Windows is:
// C:
// C:.
// then an error will be thrown as the definition for the above
// refers to `current directory on drive C:`
// Since filepath.Clean() will automatically normalize the above
// to `C:.`, we only need to check the last format
if pattern.MatchString(current) {
return "", fmt.Errorf("%s is not a directory. If you are specifying a drive letter, please add a trailing '\\'", current)
}
if pattern.MatchString(requested) {
return "", fmt.Errorf("%s is not a directory. If you are specifying a drive letter, please add a trailing '\\'", requested)
}
// Target semantics is C:\somefolder, specifically in the format:
// UPPERCASEDriveLetter-Colon-Backslash-FolderName. We are already
// guaranteed that `current`, if set, is consistent. This allows us to
// cope correctly with any of the following in a Dockerfile:
// WORKDIR a --> C:\a
// WORKDIR c:\\foo --> C:\foo
// WORKDIR \\foo --> C:\foo
// WORKDIR /foo --> C:\foo
// WORKDIR c:\\foo \ WORKDIR bar --> C:\foo --> C:\foo\bar
// WORKDIR C:/foo \ WORKDIR bar --> C:\foo --> C:\foo\bar
// WORKDIR C:/foo \ WORKDIR \\bar --> C:\foo --> C:\bar
// WORKDIR /foo \ WORKDIR c:/bar --> C:\foo --> C:\bar
if len(current) == 0 || system.IsAbs(requested) {
if (requested[0] == os.PathSeparator) ||
(len(requested) > 1 && string(requested[1]) != ":") ||
(len(requested) == 1) {
requested = filepath.Join(`C:\`, requested)
}
} else {
requested = filepath.Join(current, requested)
}
// Upper-case drive letter
return (strings.ToUpper(string(requested[0])) + requested[1:]), nil
}