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