remove use of github.com/docker/docker/pkg/longpath

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/image/build/context_windows.go

@@ -2,8 +2,7 @@ package build
 
 import (
 	"path/filepath"
-
-	"github.com/docker/docker/pkg/longpath"
+	"strings"
 )
 
 func getContextRoot(srcPath string) (string, error) {
@@ -11,5 +10,27 @@ func getContextRoot(srcPath string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return longpath.AddPrefix(cr), nil
+	return addPrefix(cr), nil
+}
+
+// longPathPrefix is the longpath prefix for Windows file paths.
+const longPathPrefix = `\\?\`
+
+// addPrefix adds the Windows long path prefix to the path provided if
+// it does not already have it.
+//
+// See https://github.com/moby/moby/pull/15898
+//
+// This is a copy of [longpath.AddPrefix].
+//
+// [longpath.AddPrefix]:https://pkg.go.dev/github.com/docker/docker@v28.3.2+incompatible/pkg/longpath#AddPrefix
+func addPrefix(path string) string {
+	if strings.HasPrefix(path, longPathPrefix) {
+		return path
+	}
+	if strings.HasPrefix(path, `\\`) {
+		// This is a UNC path, so we need to add 'UNC' to the path as well.
+		return longPathPrefix + `UNC` + path[1:]
+	}
+	return longPathPrefix + path
 }

cli/command/image/build/context_windows_test.go

@@ -0,0 +1,22 @@
+package build
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestStandardLongPath(t *testing.T) {
+	c := `C:\simple\path`
+	longC := addPrefix(c)
+	if !strings.EqualFold(longC, `\\?\C:\simple\path`) {
+		t.Errorf("Wrong long path returned. Original = %s ; Long = %s", c, longC)
+	}
+}
+
+func TestUNCLongPath(t *testing.T) {
+	c := `\\server\share\path`
+	longC := addPrefix(c)
+	if !strings.EqualFold(longC, `\\?\UNC\server\share\path`) {
+		t.Errorf("Wrong UNC long path returned. Original = %s ; Long = %s", c, longC)
+	}
+}

vendor/github.com/docker/docker/pkg/longpath/longpath.go

@@ -1,42 +0,0 @@
-// Package longpath introduces some constants and helper functions for handling
-// long paths in Windows.
-//
-// Long paths are expected to be prepended with "\\?\" and followed by either a
-// drive letter, a UNC server\share, or a volume identifier.
-package longpath
-
-import (
-	"os"
-	"runtime"
-	"strings"
-)
-
-// longPathPrefix is the longpath prefix for Windows file paths.
-const longPathPrefix = `\\?\`
-
-// AddPrefix adds the Windows long path prefix to the path provided if
-// it does not already have it.
-func AddPrefix(path string) string {
-	if strings.HasPrefix(path, longPathPrefix) {
-		return path
-	}
-	if strings.HasPrefix(path, `\\`) {
-		// This is a UNC path, so we need to add 'UNC' to the path as well.
-		return longPathPrefix + `UNC` + path[1:]
-	}
-	return longPathPrefix + path
-}
-
-// MkdirTemp is the equivalent of [os.MkdirTemp], except that on Windows
-// the result is in Windows longpath format. On Unix systems it is
-// equivalent to [os.MkdirTemp].
-func MkdirTemp(dir, prefix string) (string, error) {
-	tempDir, err := os.MkdirTemp(dir, prefix)
-	if err != nil {
-		return "", err
-	}
-	if runtime.GOOS != "windows" {
-		return tempDir, nil
-	}
-	return AddPrefix(tempDir), nil
-}

vendor/modules.txt

@@ -97,7 +97,6 @@ github.com/docker/docker/internal/multierror
 github.com/docker/docker/pkg/homedir
 github.com/docker/docker/pkg/ioutils
 github.com/docker/docker/pkg/jsonmessage
-github.com/docker/docker/pkg/longpath
 github.com/docker/docker/pkg/process
 github.com/docker/docker/pkg/progress
 github.com/docker/docker/pkg/stdcopy